Tổng quan nghiên cứu thiết bị piezosurgery

Piezosurgery in Modern Oral and Maxillofacial Practice: A Comprehensive Analysis of the Mectron PIEZOSURGERY® Technology

The Principles of Piezoelectric Osteotomy

The advent of piezoelectric technology represents a paradigm shift in bone surgery, moving beyond the traditional principles of mechanical ablation towards a more refined, biologically considerate approach. First introduced to oral surgery by Professor Tomaso Vercellotti in 1988, piezosurgery modifies and improves upon conventional ultrasonic techniques to overcome the inherent limitations of rotary instruments.1 The technology's clinical efficacy is rooted in a triad of fundamental physical principles: the precision of micrometric oscillation, the safety of selective tissue cutting, and the clarity afforded by the cavitation effect. Understanding these interconnected mechanisms is essential to appreciating the full scope of its clinical advantages and applications.

Mechanism of Action: From Piezoelectric Effect to Micrometric Oscillation

The foundational science of piezosurgery is the piezoelectric effect, a phenomenon first described by physicists Jacques and Pierre Curie in the late 19th century.1 They observed that certain crystalline materials, such as quartz, generate an electric charge in response to applied mechanical stress.3 Piezosurgical devices operate on the converse piezoelectric effect, where this process is reversed.3 An alternating electric current is passed through piezoelectric ceramic discs or crystals housed within the device's transducer.1 This applied electric field causes the crystals to rhythmically deform—compressing and expanding—which in turn generates high-frequency vibrations in the ultrasonic range.7 These ultrasonic oscillations are then amplified and transmitted to a specialized surgical tip, known as an insert.1 This results in controlled, predominantly linear micro-vibrations at the working end of the instrument.8 For osteotomy applications, the operating frequency is precisely modulated to a range of 24 to 36 kHz, with a micro-vibration amplitude typically between 60 and 210 micrometers per second ($µm/s$).1 This action is fundamentally different from the aggressive, high-torque macro-vibrations and rotational cutting of conventional burs and saws.13 The cutting of mineralized tissue is achieved not by grinding or sawing, but by the rapid, repetitive mechanical impact of the insert, which causes microscopic comminution of the bone structure under very light pressure.1 This mechanism affords the surgeon exceptional control and a heightened intra-operative tactile sensation, allowing for a more nuanced and precise surgical approach.10

The Doctrine of Selective Cutting: Preserving Neurovascular and Soft Tissues

The most profound and clinically significant advantage of piezosurgery is its remarkable ability to selectively cut hard, mineralized tissues while leaving adjacent soft tissues unharmed.4 This tissue-discriminating capability is the cornerstone of the technology's superior safety profile and is a direct consequence of the physics of ultrasonic micro-vibrations. The mechanism for this selectivity is based on the different biomechanical properties of hard and soft tissues. Soft tissues, such as nerves, blood vessels, and mucous membranes, are composed primarily of water and elastic fibers. When these tissues come into contact with the vibrating insert, their elasticity allows them to absorb the ultrasonic energy and oscillate in unison with the tip without tearing or being damaged.5 In stark contrast, mineralized tissues like bone and teeth are rigid and brittle. They lack the elasticity to absorb and dissipate the high-frequency vibrations. Consequently, the mechanical energy is concentrated at the point of contact, leading to a precise fracture and ablation of the calcified structure.5 The operational frequency of piezosurgical devices is specifically calibrated for this effect; frequencies significantly higher than 50 kHz would be required to cut soft tissue, a range well outside the device's parameters.1 This principle of selective cutting provides an unparalleled margin of safety in complex anatomical regions. It dramatically reduces the risk of iatrogenic injury to critical structures, such as the inferior alveolar nerve during third molar extractions, the Schneiderian membrane during sinus augmentation procedures, or the dura mater in neurosurgical applications.3 This inherent safety allows surgeons to perform osteotomies with greater confidence and precision, even when working in close proximity to vital anatomy.

The Cavitation Effect: Achieving Hemostasis and Enhanced Intraoperative Visibility

The third pillar of piezosurgical action is the cavitation effect, a phenomenon that occurs when the ultrasonic vibrations are transmitted through the sterile saline solution used for irrigation.1 The high-frequency oscillation of the insert creates rapid, localized pressure changes within the fluid. This causes the formation and subsequent implosion of microscopic vapor bubbles, which in turn generate minute shockwaves.7 This process yields two critical clinical benefits. First and foremost, cavitation produces a remarkably clear and blood-free surgical field.4 The aerosolized irrigant effectively washes away blood and debris from the osteotomy site, while the physical effect of cavitation is believed to contribute to hemostasis by promoting microcoagulation.6 This enhanced intra-operative visibility is not merely a convenience; it is a crucial factor that allows the surgeon to visualize the surgical site with unparalleled clarity, thereby increasing the precision and safety of the procedure.10 Second, the continuous flow of irrigant is essential for cooling both the vibrating insert and the adjacent bone.9 Overheating of bone during an osteotomy is a significant risk with conventional rotary instruments and can lead to thermal osteonecrosis, which impairs healing and can compromise clinical outcomes.2 The constant irrigation in piezosurgery effectively dissipates heat, preserving the vitality of the bone at the margins of the cut and creating a more favorable environment for postoperative healing.1 These three core principles—micrometric cut, selective cut, and cavitation—are not isolated features but rather components of a synergistic system that defines the technology's clinical value. The precision afforded by the micrometric cut is maximized by the clear surgical field created by the cavitation effect. This synergy of precision and visibility is then overlaid with the safety net of selective cutting, which minimizes the consequences of any unintended contact with soft tissue. This creates a positive feedback loop: enhanced visibility allows for more precise cuts, and the inherent safety of the instrument instills the confidence needed to perform those cuts in anatomically challenging areas. This integrated system represents a fundamental evolution from the surgical paradigm of managing the risks of a powerful but indiscriminate tool, like a rotary bur, to one that leverages a precise, selective, and biologically considerate instrument. The term "atraumatic" in this context is therefore a multifaceted concept, encompassing a reduction in mechanical trauma from macro-vibrations, thermal trauma from frictional heat, and biological trauma from inadvertent damage to the neurovascular supply and soft tissue envelope. This comprehensive reduction in trauma is the direct causal link to the improved postoperative outcomes observed in clinical studies.

The Mectron PIEZOSURGERY® white System: A Technical Review

Transitioning from the general principles of the technology to a specific clinical system, the Mectron PIEZOSURGERY® white device serves as a prime example of how these physical phenomena are engineered into a functional surgical unit. Mectron, a pioneer in the field, has designed this system with a focus on usability, safety, and economic efficiency, aiming to provide a reliable introduction to piezoelectric bone surgery.25

System Architecture and Core Features

The standard equipment set for the PIEZOSURGERY® white includes the main control unit, a K8 torque wrench for securing inserts, and a protective suitcase for transport and storage.13 The system is controlled via a foot pedal, allowing for hands-free operation during surgical procedures.1 The design of the unit emphasizes ease of use and adherence to stringent hygiene protocols. It features a smooth, seamless touch keyboard that is easy to clean and can be covered with dedicated sterile transparent foils to prevent contamination and wear.13 Key operational parameters, such as irrigation flow rate and power level, are selected with a simple touch of a finger on this interface.13 The materials used in the construction of the unit and its accessories are specifically chosen for their durability and compatibility with standard cleaning, disinfection, and sterilization procedures.25 To further enhance ergonomic flexibility, the device is equipped with a sterilizable handpiece holder that can be adjusted to one of four positions to suit the operator's preference.13 A hallmark of the Mectron system is its integration of intelligent feedback and control mechanisms designed to enhance both safety and efficiency.

• Feedback System: The device incorporates an intelligent electronic feedback system that constantly monitors and optimizes the movement of the surgical insert. It automatically detects variations in bone density and adjusts the power output accordingly, delivering more power when needed for dense cortical bone and less for cancellous bone. This automates the tuning process, simplifying user intervention to the activation of the foot pedal and ensuring consistent, efficient cutting performance in diverse clinical situations.13
• Automatic Protection Control (APC): This is a critical, integrated safety feature. The APC system continuously monitors the device's function and automatically recognizes any deviations from standard operation, such as an improperly seated insert or a system malfunction. In the event of an anomaly, it instantly stops both power and liquid flow in less than 0.1 seconds. Simultaneously, it displays the cause of the interruption on the keyboard, allowing for rapid troubleshooting.13 This fail-safe mechanism protects both the patient and the device from potential harm.

The handpiece and irrigation system are also engineered for durability and cost-effectiveness. The PIEZOSURGERY® white utilizes a sterilizable, all-in-one handpiece and cord system. A key feature is the sterilizable, internal irrigation line, which is integrated directly into the handpiece cord. This design eliminates the need for disposable irrigation tubing sets, reducing ongoing consumable costs and waste.13 The irrigation system itself is designed for economy, utilizing cost-effective standard parts, a reusable peristaltic pump tube, and standard connections for tubing, further lowering the long-term cost of ownership.13

The Armamentarium: A Review of Specialized Insert Kits and Their Indications

The versatility of the PIEZOSURGERY® system is largely derived from its extensive and highly specialized range of surgical inserts. Mectron has developed approximately 90 different inserts, providing a comprehensive armamentarium for a vast array of clinical indications across multiple dental and medical specialties.27 The PIEZOSURGERY® white is compatible with numerous insert kits, each curated for specific surgical tasks.13 Key kits available for the system include:

• Basic Kit: Serves as a foundational set for common procedures such as osteotomy, osteoplasty, simple extractions, and bone splitting.
• Implantology-Focused Kits: This category includes several tailored sets, such as the Sinus Lift Kit, which contains all the necessary inserts for performing a successful lateral sinus lift; the Implant Prep Kit (available in Starter, Pro, and Mini versions) for revolutionary, efficient, and precise implant site preparation; and the Explantation Kit for minimally invasive removal of failed implants.
• Periodontal Surgery Kits: The Resective Perio Kit and the Periodontal Kit provide specialized inserts for osseous resective surgery and other periodontal procedures.
• Other Specialized Surgical Kits: The Osteotomy Kit combines all of Mectron's micro-saws for comprehensive osteotomy capabilities; the Extraction Kit is designed for gentle and atraumatic tooth extractions; and the Retro Surgical Kit is intended for retrograde endodontic procedures.

The design of each insert is highly specific to its intended function. For example, diamond-coated tips are employed for the precise and selective ablation of bone, as in the creation of a lateral sinus window.5 In contrast, blunt, rounded inserts are used for the delicate task of elevating the Schneiderian membrane or mobilizing the inferior alveolar nerve without causing perforation or trauma.5 This high degree of specialization ensures that the surgeon has the optimal tool for every step of a given procedure.

Operational Parameters, Maintenance, and Sterilization Protocols

Detailed technical specifications for the PIEZOSURGERY® white device, including its power output, frequency range, and dimensions, are provided on a data plate located on the back of the unit and are more comprehensively detailed in the official user manuals.26 Mectron provides extensive documentation, including the Use and Maintenance Manual and specific Cleaning and Sterilization manuals, which are available for download from the company's website.13 Adherence to proper sterilization protocols is critical for patient safety. The handpiece, handpiece holder, torque wrench, and reusable inserts can be sterilized in a steam autoclave at a maximum temperature of 135°C (275°F).26 Specific, detailed instructions for the cleaning and sterilization of both the main components and the reusable inserts are outlined in dedicated manuals and are also demonstrated in official tutorial videos.25 The engineering of the Mectron system reveals a sophisticated approach that extends beyond the core technology. The inclusion of features like the APC and the automated feedback system represents a second layer of safety engineering. While the fundamental principle of selective cutting provides an inherent safety margin, these electronic systems are designed to mitigate risks arising from variations in anatomy (bone density) and potential operator error. The feedback system automates power adjustments, reducing the surgeon's cognitive load and ensuring optimal cutting efficiency without constant manual intervention. The APC acts as an ultimate fail-safe, protecting against malfunction. This demonstrates a transition from simply commercializing a physical principle to engineering a mature clinical system designed to maximize predictability and minimize human error in a real-world surgical setting. Furthermore, the design choices related to the irrigation system and the breadth of the insert portfolio reflect a deliberate strategy to lower the barriers to adoption for this advanced technology. A primary hurdle for new surgical equipment is often the high initial capital outlay combined with expensive, proprietary consumables. By designing an irrigation system that uses "cost-effective standard parts" and features a reusable pump tube and an integrated, sterilizable irrigation line, Mectron directly addresses the issue of long-term operational costs.13 This makes the financial proposition more tenable for a wider range of clinical practices. Concurrently, the vast array of specialized insert kits transforms the device from a niche tool into a versatile surgical "workhorse." This allows a clinic to amortize the initial investment over a multitude of different procedures, from routine extractions to complex reconstructions, thereby maximizing its utility and return on investment.

Clinical Applications in Implant Dentistry and Alveolar Ridge Augmentation

The field of dental implantology, where surgical precision and the biological preservation of host tissues are paramount to success, has become a primary domain for the application of piezosurgery. The technology's unique characteristics offer significant advantages in a range of procedures aimed at preparing sites and augmenting deficient alveolar ridges for implant placement.

Maxillary Sinus Augmentation (Sinus Lift)

The external, or lateral window, sinus floor elevation is a common procedure to increase bone height in the posterior maxilla. Traditionally performed with rotary burs, this procedure carries a significant risk of perforating the delicate Schneiderian membrane that lines the sinus cavity. Such a perforation can compromise the procedure, leading to graft displacement, infection, and potential failure. Piezosurgery offers a substantially safer and more controlled alternative for this critical step.5 Using specialized diamond-coated inserts, the surgeon can perform a precise osteotomy to create the lateral bony window.5 The technology's principle of selective cutting is the key advantage here; the insert will ablate the mineralized bone of the lateral maxillary wall but will not cut the underlying soft tissue membrane, even upon incidental contact.5 This inherent safety dramatically reduces the incidence of membrane perforation. Manufacturer data suggests a risk reduction of over 80% 13, a claim supported by independent clinical studies that report perforation rates dropping from as high as 30% with conventional techniques to as low as 7% when piezosurgery is employed.10 Following the creation of the window, specially designed blunt, rounded inserts can be used to atraumatically detach and elevate the membrane from the sinus floor, further minimizing the risk of tearing.5

Alveolar Ridge Splitting and Expansion

In cases of a horizontally deficient alveolar ridge, ridge splitting or expansion is a technique used to widen the bone to accommodate an implant of adequate diameter. The traditional approach using osteotomes and mallets or rotary saws can be difficult to control and carries a risk of creating unfavorable fracture lines, potentially compromising the entire segment. Piezosurgery provides a more refined and predictable method for this procedure.7 The micrometric, linear vibrations of the thin osteotomy inserts allow the surgeon to create precise, clean cuts along the crestal and facial cortices of the atrophic ridge.10 This controlled osteotomy allows for a gradual and predictable expansion of the buccal and lingual/palatal plates, creating the necessary space for immediate implant placement. The minimal trauma and high precision of the cuts reduce the risk of uncontrolled fractures, especially in the thin and often fragile bone segments characteristic of these cases. This technique is also considered less invasive than onlay bone grafting, as it avoids the morbidity associated with harvesting bone from a secondary donor site.7

Autogenous Bone Harvesting

Autologous bone remains the gold standard for grafting procedures due to its osteogenic, osteoinductive, and osteoconductive properties. Piezosurgery has proven to be a highly effective and safe tool for harvesting autogenous bone, both as particulate chips and as solid blocks, from common intraoral donor sites such as the mandibular ramus and symphysis.5 The advantages of piezosurgery in this application are multifaceted:

• Safety: When harvesting from the mandibular ramus, the selective cutting action provides a crucial safety margin, protecting the inferior alveolar nerve from inadvertent injury—a significant risk with rotary saws.10
• Graft Quality and Viability: Perhaps the most significant biological advantage is the preservation of cellular vitality within the harvested graft. The atraumatic cutting action, which avoids the high temperatures and mechanical trauma associated with burs, preserves the viability of osteocytes and osteoblasts at the margins of the cut.10 Histological studies have confirmed the presence of vital osteoblasts near the piezosurgical cut section, indicating that the harvested bone remains vital.10 This cellular vitality is critical for promoting rapid revascularization and integration of the graft at the recipient site.
• Efficiency and Ergonomics: Specialized inserts can be used to collect bone chips that are produced at an optimal particle size for regeneration. These chips can often be collected directly from the bone surface, in some cases eliminating the need for a separate bone trap or filter.1 The light touch required for operation enhances the surgeon's tactile feedback, allowing for greater control and precision during the harvesting of grafts with optimal dimensions.10

Implant Site Preparation

Piezosurgery can also be utilized for the primary osteotomy to prepare the implant bed.10 While rotary drills are highly efficient for this task, piezoelectric preparation offers distinct biological advantages. The precision of the cut is particularly beneficial when preparing sites in thin bone or in close proximity to adjacent tooth roots.10 The primary proposed benefit lies in the biological response of the bone. The absence of thermal damage, as piezosurgery inserts do not overheat, and the preservation of the bone's delicate microstructure are claimed to create a more favorable environment for healing.9 By preserving the vitality of osteocytes within the walls of the osteotomy, the technology may promote a more robust and rapid osseointegration process, which is the key to long-term implant success.9 However, it is important to note a potential limitation: the cutting efficiency of piezosurgery may be reduced in areas of highly dense cortical bone, making it less suitable for all implant site preparations in such conditions.10 The collective applications of piezosurgery in implant dentistry signal a fundamental evolution in surgical philosophy. The focus shifts from the purely mechanical objective of creating space—drilling a hole, cutting a window, or splitting a ridge—to a more sophisticated goal of preserving and optimizing the biological potential of the surgical site. In bone harvesting, the aim is not merely to acquire a piece of bone, but to acquire a viable graft containing living cells that can actively participate in the healing process. In sinus augmentation, the goal is not just to access the sinus, but to do so while preserving the integrity of the membrane, the biological barrier essential for graft containment and success. This "biologically-aware" approach, enabled by the technology's precision and atraumatic nature, is the direct antecedent to the improved clinical outcomes, such as higher graft success rates and lower complication rates, that define its value in this demanding field. The technology does not just improve existing procedures; it makes technically challenging procedures like ramus block harvesting and ridge splitting more predictable and safer, thereby acting as an enabling technology that may expand their accessibility to a broader range of clinicians.

Applications in Oral and Maxillofacial Surgery

Beyond the realm of implantology, the principles of piezoelectric osteotomy have been successfully applied to a wide spectrum of procedures in general oral and maxillofacial surgery. The technology's capacity for precise, soft-tissue-sparing bone cutting is highly advantageous in dentoalveolar surgery, endodontics, and major craniofacial and trauma reconstructions.

Surgical Extraction of Impacted Teeth

The surgical removal of impacted teeth, particularly mandibular third molars, is one of the most common procedures in oral surgery. The traditional technique involves using a high-speed rotary bur to perform an ostectomy for access and to section the tooth. This approach, while efficient, is associated with considerable postoperative morbidity, including pain, swelling, and trismus, as well as a risk of iatrogenic damage to adjacent neurovascular structures. Piezosurgery has emerged as a compelling alternative to rotary instruments for this procedure.1 By using specialized inserts, the surgeon can perform the necessary bone removal and tooth sectioning with minimal trauma to the surrounding hard and soft tissues. The primary benefit, which is substantiated by a robust body of clinical evidence, is a significant reduction in postoperative sequelae for the patient. Furthermore, the selective cutting action inherently minimizes the risk of direct trauma to the inferior alveolar and lingual nerves, which are often in close proximity to the roots of impacted lower third molars.16

Advanced Procedures: Nerve Lateralization, Cyst Enucleation, and Apicoectomy

Piezosurgery has proven invaluable in a range of advanced and delicate surgical procedures where precision and safety are of the utmost importance.

• Inferior Alveolar Nerve (IAN) Lateralization: In cases of severe mandibular atrophy, the IAN may preclude the placement of dental implants. IAN lateralization or repositioning is a high-risk procedure that involves creating a bony window in the buccal cortex and gently mobilizing the neurovascular bundle. Piezosurgery allows for the creation of this window and the subsequent dissection of the nerve with a significantly reduced risk of causing mechanical or thermal trauma, which could lead to permanent neurosensory deficits.4
• Enucleation of Jaw Cysts: The complete removal of odontogenic and non-odontogenic cysts requires careful dissection of the cystic lining from the surrounding bone. Piezosurgery facilitates the safe removal of the overlying bone laminate, providing access to the cyst without endangering adjacent tooth roots or neurovascular structures.6 The precise control allows for meticulous handling and can contribute to a more thorough enucleation, potentially reducing the risk of recurrence.6
• Endodontic Surgery (Apicoectomy): In periradicular surgery, piezosurgery is a versatile tool that can be used for multiple stages of the procedure, including the initial osteotomy to access the root apex, the root-end resection, and the retrograde preparation of the root canal.35 Specially angled inserts provide superior access and visibility, particularly in posterior regions, allowing for a more elegant and minimally invasive approach compared to the use of traditional contra-angle handpieces and burs.5

The Role of Piezosurgery in Orthognathic Surgery and Maxillofacial Trauma

The benefits of piezoelectric osteotomy extend to major maxillofacial procedures, including corrective jaw surgery and the management of facial trauma.

• Orthognathic Surgery: Piezosurgery has been successfully integrated into a variety of orthognathic procedures, such as Le Fort I maxillary osteotomies, Bilateral Sagittal Split Osteotomies (BSSO) of the mandible, and genioplasties.19 In these complex surgeries, the technology offers several advantages over conventional saws and burs. It allows for the creation of more precise and clean osteotomy lines, which can facilitate better segment positioning and stability.19 The cavitation effect leads to reduced intraoperative blood loss, improving visibility in a complex surgical field.19 Most importantly, the soft-tissue-sparing nature of the cuts reduces the risk of damage to critical nerves and vessels, such as the inferior alveolar nerve during a BSSO or the descending palatine artery during a Le Fort I osteotomy, potentially leading to faster and more complete postoperative neurosensory recovery.19 While access with the handpiece to posterior regions can sometimes be challenging, the technique is widely regarded as a safe and effective tool in orthognathic surgery.33
• Maxillofacial Trauma: In the surgical management of facial fractures, piezosurgery can be a valuable adjunct.4 Its precision and safety are highly advantageous when performing osteotomies for fracture reduction, repositioning bone fragments, or preparing sites for fixation plates, especially in anatomically dense areas or when working near vital structures like the orbit or cranial base.4

The diverse applications of this technology reveal a critical principle: its clinical value proposition is directly proportional to the inherent risk of the procedure being performed. For a simple ostectomy in a wide, open area with no adjacent vital structures, the primary consideration is efficiency, a domain where the rotary bur excels. In this low-risk scenario, the additional time required for piezosurgery may offer little tangible benefit. However, as the proximity to vital structures increases and the potential consequences of a surgical error become more severe, the calculus changes. For an impacted third molar adjacent to the IAN, the reduced risk of nerve injury and improved postoperative course begin to justify the time trade-off. For high-stakes procedures like IAN lateralization or a BSSO, where the risk of a permanent, life-altering complication with conventional tools is significant, the selective cutting feature of piezosurgery transitions from a desirable benefit to a mission-critical safety feature. In these anatomically "unforgiving" scenarios, the longer operative time becomes a negligible factor when weighed against the prevention of a catastrophic outcome. Piezosurgery is therefore not a universal replacement for traditional tools, but rather a specialized instrument whose adoption should be guided by a careful, risk-based assessment of each unique clinical situation.

Comparative Clinical Efficacy: Piezosurgery versus Conventional Rotary Instruments

The evaluation of any new surgical technology requires rigorous comparison against the established standard of care. In the case of piezoelectric osteotomy, the benchmark is the conventional rotary instrument (i.e., surgical burs and saws). A substantial body of evidence, including numerous prospective randomized controlled trials (RCTs) and several systematic reviews with meta-analyses, has been published, primarily focusing on the surgical removal of impacted mandibular third molars—a model procedure for comparing osteotomy techniques. This evidence provides a clear picture of the relative strengths and weaknesses of each modality, focusing on patient-centered postoperative outcomes and key operational metrics.

Analysis of Postoperative Sequelae: A Synthesis of Meta-Analytic Data

The most consistent finding across the clinical literature is that piezosurgery provides a more favorable postoperative course for the patient, with significant reductions in the cardinal signs of surgical inflammation.

• Pain: Multiple high-level studies have demonstrated that patients undergoing osteotomy with piezosurgery experience significantly less postoperative pain compared to those treated with rotary instruments.16 A meta-analysis of five RCTs found that while pain scores in the immediate postoperative period (days 1-2) were not significantly different, pain at 6 or 7 days post-surgery was significantly lower in the piezosurgery group (Standardized Mean Difference -0.33, 95% Confidence Interval [CI]: -0.56 to -0.10, $P = 0.005$).37 This suggests that while the initial surgical pain may be similar, the recovery is less painful and more comfortable in the later stages of healing for patients treated with the piezoelectric device.
• Swelling (Edema): Postoperative facial swelling is a common and distressing side effect of oral surgery. The evidence consistently and strongly indicates that piezosurgery leads to significantly less postoperative edema.2 The same meta-analysis confirmed this finding, reporting that swelling scores at 7 days after surgery were significantly lower in the piezosurgery group (SMD -1.95, 95% CI: -3.22 to -0.67, $P = 0.003$).37 This reduction in swelling contributes to a more comfortable recovery and a faster return to normal social function.
• Trismus (Reduced Mouth Opening): Trismus, or the inability to open the mouth fully, is caused by inflammation and spasm of the muscles of mastication. Clinical trials show that patients treated with piezosurgery experience better trismus recovery.2 Meta-analytic data supports this, showing that mouth opening at 1 day after surgery was significantly better in the piezosurgery group (SMD 0.84, 95% CI: 0.19 to 1.49, $P = 0.01$).37 While the difference may become non-significant by day 7, this initial improvement suggests that patients return to normal function, such as eating and speaking, more quickly after piezoelectric surgery.2

The Trade-Off: Operative Time, Learning Curve, and Ergonomics

The clear benefits in patient-centered outcomes come at a significant and well-documented cost: operative time.

• Operative Time: The most consistent and statistically robust finding in the comparative literature is that piezosurgery requires a significantly longer operative time to perform an equivalent osteotomy.16 A meta-analysis reported this difference with a high degree of confidence, finding that piezosurgery required, on average, over 6 minutes longer per procedure (Mean Difference 6.23 minutes, 95% CI: 3.32 to 9.14, $P < 0.0001$).37 This is a direct consequence of the technology's mechanism; the micrometric vibrations are inherently less efficient at bulk bone removal than the aggressive mechanical action of a rotary bur.37 This time difference is a critical factor for practice management and surgical scheduling.
• Learning Curve and Ergonomics: Piezosurgery is considered a technique-sensitive procedure with a distinct learning curve.8 Surgeons accustomed to the pressure required to engage a rotary bur must adapt to a much lighter, "feather-light" touch.10 Applying excessive pressure is counterproductive, as it dampens the insert's micro-vibrations, reducing cutting efficiency and transforming the vibrational energy into potentially damaging heat.8 However, once mastered, this requirement for less hand pressure can translate into an ergonomic advantage, affording the operator enhanced tactile sensitivity and a greater "feel" for the transition between different bone densities, such as cortical and cancellous bone.10

Safety Profile: Iatrogenic Injury to Nerves and Adjacent Structures

While the fundamental principle of selective cutting provides a strong theoretical basis for enhanced safety, clinical data offers more nuanced support. The atraumatic nature of the cut is believed to be the primary reason for the reduced postoperative inflammatory response.2 Regarding the critical outcome of nerve injury, a meta-analysis found that the incidence was lower in the piezoelectric group, but this difference did not reach statistical significance, likely due to the low overall event rate in the included studies.16 Nonetheless, the combination of the technology's selective cutting action and the improved visibility from the cavitation effect provides a powerful argument for its use in procedures where neurovascular structures are at high risk. The following table summarizes the highest-level evidence from meta-analyses comparing piezosurgery to conventional rotary instruments for the surgical removal of mandibular third molars. Table 5.1: Summary of Evidence from Meta-Analyses Comparing Piezosurgery and Conventional Rotary Instruments

Outcome Measure Finding (Piezosurgery vs. Rotary) Level of Evidence / Key Finding Source(s) Postoperative Pain @ Day 1-2 No Significant Difference Pooled results showed no statistically significant difference in early-stage pain. (SMD -0.21, $P = 0.22$) 37 Postoperative Pain @ Day 6-7 Significantly Lower Pain scores were significantly lower in the piezosurgery group in the later healing phase. (SMD -0.33, $P = 0.005$) 37 Swelling (Edema) @ Day 7 Significantly Lower Swelling was significantly reduced in patients treated with piezosurgery. (SMD -1.95, $P = 0.003$) 24 Trismus (Mouth Opening) @ Day 1 Significantly Better Patients had significantly better mouth opening one day after surgery with piezosurgery. (SMD 0.84, $P = 0.01$) 37 Trismus (Mouth Opening) @ Day 7 No Significant Difference By the end of the first week, differences in mouth opening were no longer statistically significant. (SMD 0.25, $P = 0.29$) 37 Operative Time Significantly Longer Piezosurgery requires significantly more time to complete the osteotomy. (MD 6.23 minutes, $P < 0.0001$) 16 Analgesic Dosage No Significant Difference Pooled results did not show a significant difference in the amount of postoperative pain medication consumed. 37 Nerve Injury Incidence Lower (Not Statistically Significant) The incidence of nerve injury was lower in the piezosurgery group, but the difference was not statistically significant in meta-analysis. 16 The robust clinical data presents a clear and compelling dilemma that lies at the heart of the decision to adopt this technology. On one hand, piezosurgery offers undeniable patient-centric benefits: a demonstrably less painful, less swollen, and more comfortable postoperative recovery. This is a powerful driver for enhancing patient satisfaction and can serve as a significant differentiator for a surgical practice marketing itself on minimally invasive techniques. On the other hand, these benefits come at the direct and quantifiable cost of practice efficiency. The significantly longer chair time required for each procedure directly impacts a practice's throughput and, consequently, its revenue potential. This creates a fundamental tension between optimizing the patient experience and maintaining practice economics. The decision to integrate piezosurgery is therefore not a purely clinical one based on efficacy alone; it is a strategic business decision. It compels a practice to define its core values: is the primary objective to maximize procedural efficiency and patient volume, or is it to provide a premium, patient-focused experience, potentially at a higher fee or with a lower patient load? Navigating this "Patient Experience vs. Practice Economics" dilemma is the central challenge to the widespread adoption of piezoelectric technology.

The Biological Basis of Piezosurgical Osteotomy: Histological and Cellular Insights

To fully comprehend the clinical observations of improved postoperative outcomes, it is necessary to examine the effects of piezosurgery at the microscopic and cellular levels. Histological, histomorphometric, and molecular analyses provide a biological rationale for the technology's performance, offering insights into its impact on osteocyte viability, thermal damage, and the subsequent cascade of bone healing.

Osteocyte Viability and Thermal Effects at the Osteotomy Site

A primary concern with any osteotomy technique is the potential for iatrogenic damage to the bone itself, particularly through excessive heat generation, which can lead to osteonecrosis and delayed healing. Conventional rotary instruments, through friction, can generate significant heat that must be counteracted by copious irrigation.15 Piezosurgery is designed to mitigate this risk. The ultrasonic inserts themselves do not become hot, and the integrated irrigation system, coupled with the cavitation effect, provides continuous and effective cooling of the surgical site.10 This thermal control is critical for preserving the vitality of the bone cells—osteocytes and osteoblasts—at the margins of the osteotomy.10 Histological evidence has demonstrated a lack of postoperative cellular damage and the presence of vital osteoblasts immediately adjacent to the piezosurgical cut, which is essential for initiating a robust healing response.10 However, the thermal profile is not without complexity. The technique is sensitive to operator pressure; applying excessive force can impede the insert's vibration and convert the ultrasonic energy into heat, potentially negating the instrument's inherent thermal safety.8 Furthermore, one thermal analysis, while concluding that the temperatures generated do not negatively affect tissue healing, did find that the greatest temperature variation occurred with the piezoelectric system, particularly in deeper preparations.38 In terms of immediate cellular viability, one rabbit study found that the level of immediate damage to the cavity margins and the absence of apoptotic markers (caspase-3) were similar between piezosurgery and conventional drills, suggesting both can be used without causing extensive immediate cell death when performed correctly.39

Dynamics of Bone Healing: Inflammatory Response and Neovascularization

The process of bone healing is a complex biological cascade involving inflammatory, reparative, and remodeling phases. It has been proposed that piezosurgery creates a more favorable environment for this process. Some studies suggest that the atraumatic nature of the cut leads to better control of the initial inflammatory process, with observations of a lower number of inflammatory cells in the early stages of healing compared to sites prepared with burs.3 It has also been theorized that piezosurgery may induce an earlier increase in the expression of critical growth factors like bone morphogenetic proteins (BMPs), thereby stimulating bone remodeling sooner.9 However, more comprehensive and multifactorial studies have revealed a more nuanced picture. A rigorous study in a rat model that combined histological, histomorphometric, and molecular analysis found that the overall dynamics of bone healing were largely comparable between sites prepared with piezosurgery and those prepared with conventional drilling.40 Histologically and histomorphometrically, bone healing was similar in both groups at most time points, with the only statistically significant difference being a slightly higher amount of newly formed bone in the piezosurgery group at the 30-day mark.40 Furthermore, the molecular analysis in the same study did not detect significant differences in the genetic expression of most key markers related to the BMP and Wnt signaling pathways, inflammation, or osteogenesis.40 This suggests that while there may be subtle advantages, piezosurgery does not appear to fundamentally alter or dramatically accelerate the core biological timeline of bone regeneration compared to conventional techniques.

Histomorphometric and SEM Analysis of Bone Regeneration and Surface Morphology

Quantitative histomorphometric studies comparing new bone formation have yielded a mixed, and at times contradictory, body of evidence. As mentioned, one rat study found a slight advantage for piezosurgery at 30 days.40 A study in pigs, however, found that the process of bone repair appeared greater with the conventional drill system at 7 and 14 days, with both techniques showing similar results by 28 days.43 A rabbit study found similar total amounts of new bone at 30 and 60 days for both techniques, but intriguingly noted a statistically significant increase in bone volume specifically within the piezosurgery group between the 30- and 60-day time points, hinting at a potentially different, perhaps slightly delayed but robust, healing trajectory.39 Analysis of the cut bone surface using Scanning Electron Microscopy (SEM) has also produced conflicting reports. One experimental study concluded that piezosurgery creates a remarkably smooth surface that is free of bone debris, in contrast to the surfaces left by rotary instruments.17 Conversely, a separate SEM analysis concluded the opposite: that while rotary burs cut the bone to produce a smooth surface, piezoelectric tips condense the bone and create a rough surface.38 This discrepancy does not necessarily indicate flawed research but may point to a more complex mechanism of action that is highly dependent on operational variables. Factors such as the specific insert design (e.g., smooth, serrated, or diamond-coated), the power setting used, the angle of application, and the density of the bone being cut could all influence the final surface morphology. A "condensed" surface might imply a degree of bone burnishing that could be beneficial for achieving high primary stability for a dental implant, but a "smooth" surface might be more conducive to rapid cellular migration and revascularization. This variability suggests that mastering the technique involves not only learning the requisite light touch but also understanding how to manipulate these parameters to achieve the desired biological surface for a specific clinical goal. A critical conclusion emerges when synthesizing the clinical and biological data: the robust and consistent clinical evidence for improved postoperative outcomes is not mirrored by equally strong or consistent histological evidence for superior or faster bone healing. This apparent decoupling is highly significant. If patients consistently experience less pain, swelling, and trismus, but the bone itself is healing at a largely comparable rate, it strongly implies that the primary driver of patient morbidity is not the osteotomy itself, but the trauma inflicted upon the surrounding soft tissues—the periosteum, mucosa, muscles, and neurovascular bundles. Therefore, the key biological advantage of piezosurgery likely lies in its profound preservation of this soft tissue envelope. The superior clinical outcomes are a direct result of minimizing the inflammatory cascade within these collateral tissues, rather than a fundamentally different or accelerated process of osteogenesis. This reframes the technology's core value proposition away from the claim of "better bone healing" and towards the more accurate and evidence-supported concept of "minimal collateral damage."

Synthesis and Clinical Recommendations

The integration of piezoelectric technology into modern surgical practice requires a balanced and critical appraisal of its demonstrated advantages, acknowledged limitations, and the robust body of evidence guiding its application. The Mectron PIEZOSURGERY® system, as a representative of this technology, offers a unique set of capabilities that can enhance surgical outcomes, but its optimal use demands a clear understanding of where its value is most profoundly realized.

A Critical Appraisal of Advantages and Limitations

The primary advantages of piezosurgery are well-established and center on the principles of precision and safety. The technology affords maximum surgical precision and tactile control due to its micrometric cutting action.10 Its hallmark feature is selective cutting, which provides an unparalleled margin of safety by preserving soft tissues, including nerves and vessels, from iatrogenic injury.5 This is complemented by the cavitation effect, which ensures a clear, blood-free surgical field, further enhancing precision and safety.10 Clinically, these technical benefits translate into a significantly improved postoperative experience for the patient, with consistently lower levels of pain, swelling, and trismus compared to conventional rotary instruments.16 Biologically, the atraumatic nature of the cut preserves osteocyte viability at the surgical margin, creating a favorable environment for healing.9 These benefits must be weighed against a consistent set of limitations. The most significant drawback is a substantially longer operative time, a direct result of the lower cutting efficiency of micro-vibrations compared to the aggressive action of a rotary bur.16 The technique also involves a steep and somewhat counter-intuitive learning curve, requiring the surgeon to master a light-touch approach that is antithetical to the methods used with traditional instruments.8 Other practical considerations include difficulties in performing very deep osteotomies due to the length and thickness of the inserts, the potential for rapid insert wear with use, and the high initial capital investment required for the equipment.8

Evidence-Based Indications for Clinical Integration

Based on a synthesis of the available evidence, the decision to employ piezosurgery should be guided by a risk-benefit analysis specific to the procedure and patient. The technology is not a universal replacement for rotary instruments but rather a specialized tool whose use is most justified in specific clinical scenarios. High-Value Indications: Piezosurgery is strongly recommended for procedures where its safety and precision provide a clear clinical advantage that outweighs the disadvantage of longer operative time. These include:

• Maxillary Sinus Augmentation: Specifically for the creation of the lateral window, where the risk of Schneiderian membrane perforation is high with conventional techniques.
• Osteotomies in Proximity to Nerves: Any procedure requiring bone removal near major neurovascular bundles, such as the inferior alveolar nerve (e.g., third molar removal, cyst enucleation, BSSO) or the mental nerve (e.g., genioplasty, implant placement).
• Delicate Autogenous Bone Harvesting: For obtaining block grafts from the mandibular ramus or symphysis, where the preservation of graft viability and the protection of adjacent nerves are critical.
• Alveolar Ridge Splitting and Expansion: For the controlled osteotomy of thin, atrophic ridges where the risk of uncontrolled fracture is a primary concern.
• Advanced Endodontic and Orthognathic Surgeries: In procedures requiring fine, precise, or curvilinear cuts in anatomically complex regions.

Consideration-Based Indications: The use of piezosurgery may also be considered in any osteotomy procedure where the primary goal is to minimize postoperative morbidity. This may be particularly relevant for anxious patients, medically compromised individuals who may have a more pronounced inflammatory response, or in aesthetic cases where minimizing swelling is a priority. Contraindications: There are specific situations where the use of piezosurgery is contraindicated. The only absolute contraindication is in patients with cardiac pacemakers or other implantable electronic devices, as the ultrasonic frequency could potentially cause electromagnetic interference.8 Relative contraindications or situations requiring caution include performing osteotomies directly on metallic or ceramic prostheses, as the vibrations could lead to de-cementation, and in patients with certain uncontrolled systemic conditions, such as severe cardiopathy, uncontrolled diabetes, or a history of radiation therapy to the surgical site.8

Future Directions in Piezoelectric Surgical Technology

The field of piezoelectric surgery continues to evolve. Technologically, there is a clear trend toward the development of more powerful and efficient devices, such as the newer generations of Mectron units, which are designed to increase cutting efficacy and address the primary limitation of long operative times.14 Future innovations will likely focus on further optimizing power modulation, developing more durable and efficient insert designs, and potentially integrating navigation or robotic systems to further enhance precision. From a research perspective, while the short-term clinical benefits are well-documented, several gaps remain. There is a need for more large-scale, multi-center RCTs to confirm the findings of existing meta-analyses and to investigate outcomes in a wider range of surgical procedures. Further research is also needed to clarify the nuanced histological effects of piezosurgery, particularly to resolve the conflicting reports on bone surface morphology and to better understand the long-term quality of the regenerated bone. Studies focusing on long-term clinical outcomes, such as the survival rates of implants placed in piezo-prepared sites versus drill-prepared sites, will be crucial for defining the ultimate impact of this technology on patient care. In conclusion, the collective evidence suggests that the most rational framework for integrating piezosurgery into clinical practice is to view it not as a direct competitor to the rotary drill, but as a sophisticated risk management tool. Every surgical intervention involves a careful balance of efficiency, cost, and the risk of complications. Rotary instruments represent a highly efficient and cost-effective option but carry a higher inherent risk of collateral damage to delicate structures. Piezosurgery, conversely, is less efficient and more costly but offers a significantly lower risk of such complications. Therefore, the clinical decision-making process should shift from the simple question of "Which tool is faster?" to the more critical question of "Which tool provides the appropriate level of safety for the given risk profile of this specific procedure, in this specific anatomical location, for this specific patient?" This risk-based paradigm provides a logical and defensible rationale for when to invest the additional time and resources required to leverage the precision, safety, and biological benefits of a piezoelectric osteotomy. Nguồn trích dẫn 1. PIEZOSURGERY : A BENEFIT TO DENTISTRY – IJNRD, truy cập vào tháng 10 25, 2025, https://www.ijnrd.org/papers/IJNRD2302195.pdf 2. A Randomized Controlled Trial Application of Piezosurgery in Surgical Extraction of Impacted Mandibular Third Molars Versus Conventional Rotatory Technique – SciELO, truy cập vào tháng 10 25, 2025, https://www.scielo.br/j/pboci/a/5np4zrkHfdbBxTnYqJM7LnB/?lang=en 3. Piezosurgery in Bone Augmentation Procedures Previous to Dental Implant Surgery: A Review of the Literature – NIH, truy cập vào tháng 10 25, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC4765509/ 4. Using Piezoelectric System in Oral and Maxillofacial Surgery – Dialnet, truy cập vào tháng 10 25, 2025, https://dialnet.unirioja.es/descarga/articulo/8856624.pdf 5. Piezo surgery – a universal principle for diverse indications | W&H …, truy cập vào tháng 10 25, 2025, https://www.wh.com/en_na/dental-newsroom/reports-and-studies/new-article/04787 6. Piezosurgery in oral and maxillofacial surgery | PPTX – Slideshare, truy cập vào tháng 10 25, 2025, https://www.slideshare.net/slideshow/piezosurgery-in-oral-and-maxillofacial-surgery/39090577 7. Advances in piezoelectric Instruments: Applications and outcomes in oral surgery – International Journal of Applied Dental Sciences, truy cập vào tháng 10 25, 2025, https://www.oraljournal.com/archives/2025/vol11issue1/PartD/11-1-33-274.pdf 8. Piezosurgery: A Boon for Modern Periodontics – PMC – NIH, truy cập vào tháng 10 25, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC5343677/ 9. (PDF) Piezosurgery in dentistry – ResearchGate, truy cập vào tháng 10 25, 2025, https://www.researchgate.net/publication/306125103_Piezosurgery_in_dentistry 10. The role of piezosurgery in implant dentistry – Dr Adam Patel, truy cập vào tháng 10 25, 2025, https://dradampatel.com/wp-content/uploads/2022/03/Article-2-Implant-Dentistry-The-role-of-Piezosurgery.pdf 11. Piezosurgery in Periodontics – International Journal of Prosthodontics and Restorative Dentistry, truy cập vào tháng 10 25, 2025, https://www.ijoprd.com/doi/10.5005/jp-journals-10019-1129 12. Piezosurgery – Modern dentistry's innovative tool – A review article – Maaen Journal for Medical Sciences, truy cập vào tháng 10 25, 2025, https://majms.alkafeel.edu.iq/cgi/viewcontent.cgi?article=1058&context=journal 13. PIEZOSURGERY® white – mectron dental, truy cập vào tháng 10 25, 2025, https://dental.mectron.com/products/piezosurgery/units/piezosurgeryr-white/ 14. PIEZOSURGERY® touch – mectron dental, truy cập vào tháng 10 25, 2025, https://dental.mectron.com/products/piezosurgery/units/piezosurgeryr-touch/ 15. Cutting bone with drills, burs, lasers and piezotomes: A comprehensive systematic review and recommendations for the clinician, truy cập vào tháng 10 25, 2025, https://www.organscigroup.us/articles/IJOCS-3-128.php 16. The Comparative Efficacy of Burs Versus Piezoelectric Techniques in Third Molar Surgery: A Systematic Review Following the PRISMA Guidelines – MDPI, truy cập vào tháng 10 25, 2025, https://www.mdpi.com/1648-9144/60/12/2049 17. Experimental Comparison of the Performance of Cutting Bone and …, truy cập vào tháng 10 25, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC6249262/ 18. Piezoelectric Bone Surgery: A Review of the Literature and Potential Applications in Veterinary Oromaxillofacial Surgery – PMC – NIH, truy cập vào tháng 10 25, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC4672167/ 19. The Application of Piezosurgery in Orthognathic … – CMJ Publishers, truy cập vào tháng 10 25, 2025, https://www.cmjpublishers.com/wp-content/uploads/2025/01/the-application-of-piezosurgery-in-orthognathic-surgery-a-literature-review.pdf 20. Major Approaches on the Piezoelectric Device, Drills and Saws to Orthognathic Surgery: A Systematic Review – Scientific Research Publishing, truy cập vào tháng 10 25, 2025, https://www.scirp.org/journal/paperinformation?paperid=93124 21. Piezosurgery-A Review – CABI Digital Library, truy cập vào tháng 10 25, 2025, https://www.cabidigitallibrary.org/doi/pdf/10.5555/20153062325 22. Piezosurgery Applied to Orthognathic Surgery-Retrospective Study with New Mandibular Saggital Piezo-Osteotomy Technique Description | Semantic Scholar, truy cập vào tháng 10 25, 2025, https://www.semanticscholar.org/paper/Piezosurgery-Applied-to-Orthognathic-Study-with-New-Lima-Stevao/96d18d284296c838c92d987a8995454d251178f7 23. Piezoelectric Surgery – Vero Beach – Salomon Israel DDS, truy cập vào tháng 10 25, 2025, https://www.drsalomonisrael.com/procedures/piezoelectric-surgery/ 24. (PDF) Piezosurgery Versus Rotary Instruments for Mandibular …, truy cập vào tháng 10 25, 2025, https://www.researchgate.net/publication/393878579_Piezosurgery_Versus_Rotary_Instruments_for_Mandibular_Impacted_Third_Molars_Extractions_A_Prospective_Randomized_Clinical_Study 25. PIEZOSURGERY – MECTRON, truy cập vào tháng 10 25, 2025, https://piezosurgery.mectron.com/units-en.html 26. Use and maintenance manual – Kebomed, truy cập vào tháng 10 25, 2025, https://www.kebomed.dk/files/427/en_manuale_uso_ps_plus_v02.pdf 27. PIEZOSURGERY® + PIEZODRILL® – mectron dental, truy cập vào tháng 10 25, 2025, https://dental.mectron.com/products/piezosurgery/ 28. Piezosurgery in periodontology – IP Int J Periodontol Implantol, truy cập vào tháng 10 25, 2025, https://ijpi.in/archive/volume/8/issue/2/article/4088 29. PIEZOSURGERY® white – Mectron Documents, truy cập vào tháng 10 25, 2025, https://manuals.mectron.com/document/piezosurgery-white/ 30. MECTRON – PIEZOSURGERY®, truy cập vào tháng 10 25, 2025, https://piezosurgery.mectron.com/downloads-en.html 31. TUTORIALS – PIEZOSURGERY® touch and white assembly – YouTube, truy cập vào tháng 10 25, 2025, https://www.youtube.com/watch?v=nt5B_Pkh9Wg 32. Role of Piezo Surgery and Lasers in the Oral Surgery Office | Pocket Dentistry, truy cập vào tháng 10 25, 2025, https://pocketdentistry.com/role-of-piezo-surgery-and-lasers-in-the-oral-surgery-office/ 33. Role Of Piezosurgery in Oral and Maxillofacial Surgery- A Review, truy cập vào tháng 10 25, 2025, https://www.jneonatalsurg.com/index.php/jns/article/download/5337/4424/18970 34. Piezosurgery: A Look at the Top Five Reasons for Jaw Surgery, truy cập vào tháng 10 25, 2025, https://www.niguelcoastoralsurgery.com/five-reasons-for-jaw-surgery/ 35. Applications of piezoelectric surgery in endodontic surgery: a literature review – PubMed, truy cập vào tháng 10 25, 2025, https://pubmed.ncbi.nlm.nih.gov/24565647/ 36. 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(PDF) Evaluation of immediate cell viability and repair of …, truy cập vào tháng 10 25, 2025, https://www.researchgate.net/publication/340652104_Evaluation_of_immediate_cell_viability_and_repair_of_osteotomies_for_implants_using_drills_and_piezosurgery_A_randomized_prospective_and_controlled_rabbit_study 40. (PDF) Dynamics of bone healing after osteotomy with piezosurgery or conventional drilling – histomorphometrical, immunohistochemical, and molecular analysis – ResearchGate, truy cập vào tháng 10 25, 2025, https://www.researchgate.net/publication/256927040_Dynamics_of_bone_healing_after_osteotomy_with_piezosurgery_or_conventional_drilling_-_histomorphometrical_immunohistochemical_and_molecular_analysis 41. Dynamics of bone healing after osteotomy with piezosurgery or …, truy cập vào tháng 10 25, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC3868312/ 42. pmc.ncbi.nlm.nih.gov, truy cập vào tháng 10 25, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC3868312/#:~:text=Histologically%20and%20histomorphometrically%2C%20bone%20healing,piezosurgery%20(p%20%3C%200.05). 43. Comparison between a piezoelectric device and rotary instruments in implant site preparation: An in vivo morphological, histological analysis using pigs – ResearchGate, truy cập vào tháng 10 25, 2025, https://www.researchgate.net/publication/316005356_Comparison_between_a_piezoelectric_device_and_rotary_instruments_in_implant_site_preparation_An_in_vivo_morphological_histological_analysis_using_pigs 44. an in vivo morphological, histological analysis using pigs Comparison between a piezoelectric device and rotary instruments in implant site preparation – SciELO, truy cập vào tháng 10 25, 2025, https://www.scielo.br/j/rgo/a/Kv8rxLpYynxBY3n7YjZPGsF/?lang=en 45. Comparison between a piezoelectric device and rotary instruments in implant site preparation: an in vivo morphological, histolog – SciELO, truy cập vào tháng 10 25, 2025, https://www.scielo.br/j/rgo/a/Kv8rxLpYynxBY3n7YjZPGsF/?format=pdf&lang=en