So sánh sản phẩm bioceramic và MTA

An In-Depth Analysis of Bioceramic and MTA Materials in Modern Endodontics: A Comprehensive Review of Products and Clinical Performance

Part I: The Scientific Foundation of Bioceramic Materials in Endodontics

1.1 Introduction: A Paradigm Shift from Inert Sealing to Bioactive Regeneration

The field of endodontics has undergone a significant transformation over the past three decades, largely driven by advancements in biomaterials science. Historically, the primary objective of root canal obturation was to achieve a hermetic, three-dimensional seal of the canal system using materials that were as biologically inert as possible.1 Traditional materials, such as zinc oxide-eugenol (ZOE) and various resin-based sealers, were designed to function as passive fillers, physically occupying the canal space to prevent microbial leakage.3 While these materials have a long history of clinical use, their limitations—including cytotoxicity, shrinkage upon setting, solubility, and a lack of adhesion to dentin—have been well-documented.2 The introduction of bioceramic materials in the 1990s marked a revolutionary departure from this philosophy of bio-inertness.5 Bioceramics are defined as a class of biocompatible ceramic materials or metal oxides specifically designed to interact with and elicit a specific response from biological systems.3 This category includes a range of materials such as alumina, zirconia, bioactive glass, hydroxyapatite, and, most prominently in endodontics, calcium silicate-based cements.5 The fundamental innovation of bioceramics lies in their bioactivity—the ability to form a layer of hydroxyapatite when in contact with physiological fluids, thereby promoting a chemical bond with hard tissues and stimulating a healing response.4 This development represents a paradigm shift in endodontic treatment, moving from a goal of simply "sealing" the root canal to one of actively "healing" and "regenerating" the surrounding periradicular tissues.6 The application of bioceramic-based materials has greatly expanded the clinician's ability to successfully manage complex endodontic challenges. Their unique properties have proven invaluable in procedures such as vital pulp therapy (pulp capping and pulpotomy), apexification in immature teeth, apexogenesis, repair of iatrogenic perforations and resorptive defects, and as root-end filling materials in surgical endodontics.3 As the technology has evolved, these materials are now also widely used as root canal sealers for conventional obturation, fundamentally changing the approach to non-surgical root canal treatment.4

1.2 The Core Mechanism of Action: Hydration, Alkalinity, and Biomineralization

The therapeutic efficacy of calcium silicate-based bioceramics is rooted in a unique and predictable chemical reaction that occurs within the root canal environment. Unlike materials that set via polymerization or acid-base reactions, the primary setting mechanism for most bioceramics is a hydration reaction, a process that critically depends on the presence of moisture.4 The dentinal tubules, which are composed of approximately 20% water by volume, provide the necessary aqueous environment to initiate and complete this reaction.14 The process begins when the primary components of the material, tricalcium silicate ($Ca_3SiO_5$) and dicalcium silicate ($Ca_2SiO_4$), come into contact with water. This initiates a hydration reaction that forms two key byproducts: a calcium silicate hydrate (CSH) gel and calcium hydroxide ($Ca(OH)_2$).11 The CSH gel is a stable, hardened matrix that provides the material with its structural integrity and dimensional stability, while the calcium hydroxide is the primary driver of the material's bioactivity.12 The dissociation of calcium hydroxide into calcium ($Ca^{2+}$) and hydroxyl ($OH^-$) ions creates a highly alkaline environment at the material-tissue interface, with the pH often rising to 12.5 or higher.6 This elevated pH has a potent antibacterial effect, capable of neutralizing residual microorganisms within the canal system and dentinal tubules, thereby contributing to disinfection and preventing reinfection.4 This antimicrobial property is a significant advantage over many traditional sealers that may encourage bacterial growth over time.22 The most crucial aspect of this mechanism is the stimulation of biomineralization. The released calcium ions from the bioceramic material interact with phosphate ions that are naturally present in dentinal fluid and periapical tissues.11 This interaction leads to the precipitation of a layer of hydroxyapatite ($Ca_{10}(PO_4)_6(OH)_2$) or a biologically similar carbonated apatite on the surface of the material and within the dentinal tubules.4 This process is the hallmark of bioactivity and is responsible for the material's ability to form a true chemical bond with the dentin wall.4 This interfacial layer of hydroxyapatite creates a superior biological seal, effectively obliterating the space between the filling material and the tooth structure, which minimizes microleakage and promotes the healing of periradicular tissues.5 In applications like pulp capping or perforation repair, this biomineralization process can induce the formation of a durable, mineralized tissue barrier, protecting the underlying vital tissue from bacterial ingress.9

1.3 Desirable Physicochemical and Biological Properties

The clinical success of bioceramic materials is attributable to a combination of favorable physicochemical and biological properties that align closely with the requirements for an ideal endodontic material. Biological Properties:

Biocompatibility and Low Cytotoxicity: Bioceramics are characterized by their exceptional biocompatibility. When placed in contact with vital pulp or periapical tissues, they are non-toxic and do not elicit a significant inflammatory response.5 This is a critical advantage, as even minor extrusion of the material beyond the apex is well-tolerated by the body, minimizing postoperative inflammation and promoting a favorable healing environment.9
Bioactivity and Osteoinductivity: As previously described, their ability to form hydroxyapatite makes them bioactive, promoting a bond with dentin and stimulating hard tissue formation.4 This process can induce odontoblast-like cell differentiation and stimulate the secretion of reparative dentin, a key objective in vital pulp therapy.9 This osteoinductive capacity supports the regeneration of periapical tissues, including cementum and alveolar bone.17

Physicochemical Properties:

Dimensional Stability: A hallmark of bioceramics is their lack of shrinkage upon setting. Most formulations are dimensionally stable or exhibit a slight expansion, which is crucial for maintaining the integrity of the apical seal over time and preventing the formation of gaps that could permit microleakage.5 This contrasts sharply with resin-based sealers, which are known to shrink during polymerization.1
Sealing Ability: The combination of zero shrinkage, excellent flow characteristics, and the ability to form a chemical bond with dentin results in a superior hermetic seal.9 The hydrophilic nature of these materials allows them to adapt intimately to the moist dentin walls, further enhancing the seal.4
Mechanical Strength: Bioceramics exhibit high compressive and flexural strength once set, enabling them to withstand the forces of mastication and resist dislodgement or fracture, particularly when used for perforation repair or as a root-end filling material.9
Radiopacity: Adequate radiopacity is essential for the radiographic assessment of the quality and extent of the root canal filling.6 Bioceramic formulations incorporate radiopacifying agents, such as bismuth oxide or zirconium oxide, to ensure they are clearly visible on radiographs.4
Handling Properties: While early formulations were challenging to handle, modern bioceramics have seen significant improvements in setting time, flow, and consistency. An ideal material should have a reasonable working time to allow for proper placement, followed by a relatively short setting time to facilitate single-visit treatments and reduce the risk of washout.3 Flow is also critical; the material must be flowable enough to penetrate lateral canals and isthmuses but not so fluid that it is easily extruded beyond the apex.5

Part II: Mineral Trioxide Aggregate (MTA): The Foundational Gold Standard

Mineral Trioxide Aggregate (MTA) was the first bioceramic material to be successfully introduced into clinical endodontics, and it remains the benchmark against which all subsequent bioceramic innovations are measured. Its development and extensive study established the principles of bioactive endodontic therapy and laid the groundwork for an entire class of regenerative materials.

2.1 Genesis and Composition of MTA

MTA was developed in the early 1990s at Loma Linda University by Dr. Mahmoud Torabinejad and his team.27 Following extensive research, it received approval from the U.S. Food and Drug Administration (FDA) in 1998 for endodontic applications.8 It was the first material of its kind and quickly gained recognition for its superior sealing ability and biocompatibility compared to existing repair materials like amalgam, Intermediate Restorative Material (IRM), and Super EBA.16 The composition of MTA is fundamentally derived from Portland cement, a hydraulic cement widely used in the construction industry.3 While not interchangeable with construction-grade material due to differences in purity and particle size, MTA shares the same core chemical components. It is primarily composed of tricalcium silicate ($Ca_3SiO_5$ or C3S), which is responsible for the initial set and early strength, and dicalcium silicate ($Ca_2SiO_4$ or C2S), which hydrates more slowly and contributes to the material's late strength.12 Other components include tricalcium aluminate and tetracalcium aluminoferrite.16 To render the material visible on radiographs, a crucial requirement for dental use, approximately 20% bismuth oxide ($Bi_2O_3$) was added to the formulation as a radiopacifier.4

2.2 Grey MTA vs. White MTA: The Discoloration Dilemma

The original commercial formulation of MTA, known as ProRoot MTA (Dentsply), was grey in color (GMTA). This grey hue was primarily attributed to the presence of tetracalcium aluminoferrite, an iron-containing compound.17 While clinically effective, the dark color of GMTA led to significant aesthetic concerns, particularly when used in the anterior dentition, as it could cause a noticeable grey discoloration of the tooth structure.17 In response to this clinical drawback, White MTA (WMTA) was introduced in 2002.8 The primary compositional difference in WMTA is the significantly reduced concentration of iron, aluminum, and magnesium oxides, particularly the iron oxide responsible for the grey color.8 It was hoped that this modification would resolve the issue of tooth discoloration. However, long-term clinical observation and subsequent research revealed that both GMTA and WMTA could still cause staining.4 Further investigation pointed to the bismuth oxide radiopacifier as a primary culprit. It was discovered that bismuth oxide is unstable in certain conditions; it can interact with dentin collagen or oxidizing agents like sodium hypochlorite (a common root canal irrigant), leading to the precipitation of black bismuth carbonate, which in turn causes the dark discoloration.16 This persistent problem of staining, even with the "white" formulation, became a major driver for the development of next-generation bioceramics using alternative, non-staining radiopacifying agents.

2.3 MTA as the "Gold Standard": Advantages and Limitations

Despite its drawbacks, MTA is widely regarded as the "gold standard" in many clinical applications due to its extensive evidence base and proven performance.3 Proven Advantages:

Extensive Research and Clinical History: As the first material of its class, MTA is supported by nearly three decades of in-vitro, in-vivo animal, and long-term human clinical studies. This vast body of evidence validates its efficacy and predictability in a wide range of applications, a level of documentation that newer materials have yet to achieve.3
Excellent Biocompatibility and Sealing Ability: MTA consistently demonstrates superior biocompatibility with pulpal and periradicular tissues. It is non-cytotoxic, promotes the formation of new cementum and bone, and creates a durable, minimal-leakage seal against bacterial ingress.11
Hydrophilic Nature: One of its most significant clinical advantages is its ability to set in the presence of moisture and blood. In the complex environment of the root canal system, where achieving complete dryness is often impossible, this property ensures a reliable set and prevents contamination, which is a common cause of failure with hydrophobic materials.11

Persistent Disadvantages (The Drivers of Innovation): The limitations of MTA were not merely academic; they presented real-world clinical challenges that directly spurred the development of the next generation of bioceramic materials. Each major disadvantage of MTA can be seen as a specific problem that subsequent products were engineered to solve.

Prolonged Setting Time: The hydration reaction of MTA is slow, with an initial set time of 2 to 4 hours.6 This makes single-visit procedures difficult, often requiring the placement of a temporary restoration over the unset MTA and a second appointment to complete the final restoration. This inefficiency and risk of contamination between appointments was a major impetus for developing faster-setting materials like Biodentine and MTA Angelus.6
Difficult Handling Characteristics: Clinicians have consistently reported that MTA has poor handling properties. The powder-and-liquid mixture often results in a "sandy," "gritty," or "dry" consistency that is difficult to manipulate, carry to the operative site, and compact effectively.10 This challenge led to innovations aimed at improving consistency, such as the capsule-based trituration of Biodentine and, most significantly, the development of premixed, injectable syringe-based sealers that eliminate manual mixing entirely.1
Tooth Discoloration: As discussed, the aesthetic drawback of staining from both grey and white MTA, linked to iron and bismuth oxides, was a critical failure point, especially in anterior teeth.4 This directly led to the adoption of alternative, non-staining radiopacifiers like zirconium oxide and tantalum oxide in nearly all modern bioceramic formulations.4
Washout Potential: The long, slow setting process makes MTA highly susceptible to being washed out by crevicular fluid, blood, or saliva before it has achieved sufficient hardness, compromising the seal.16 This vulnerability highlighted the need for materials with either a faster set or inherent resistance to washout.
High Cost: Compared to traditional endodontic repair materials, MTA is significantly more expensive, which can be a barrier to its widespread use.10

In essence, the market did not abandon the foundational principles of MTA's calcium silicate chemistry. Instead, it systematically deconstructed its clinical usability flaws and engineered targeted solutions. MTA's legacy is therefore twofold: it established the biological proof-of-concept for bioactive endodontics and simultaneously provided the precise technical blueprint of challenges for its successors to overcome.

Part III: A Comprehensive Review of Modern Bioceramic and MTA Products

Building on the foundation established by MTA, the dental industry has developed a diverse array of bioceramic materials, each aiming to improve upon the original formulation's limitations while retaining its core bioactive properties. This section provides a detailed analysis of the most prominent products currently available, examining their composition, formulation, and specific advantages and disadvantages.

3.1 ProRoot MTA (Dentsply Sirona)

Manufacturer & Formulation: ProRoot MTA from Dentsply Sirona is the original commercial MTA product and serves as the primary benchmark in most comparative studies.26 It is supplied as a fine powder (in single-use sachets) that is manually mixed with sterile water to a putty-like consistency.34
Composition: It is a tricalcium silicate-based cement containing tricalcium aluminate, tricalcium oxide, and silicate oxide. Its radiopacity is provided by bismuth oxide.30
Advantages: The primary advantage of ProRoot MTA is its unparalleled body of long-term clinical evidence. Having been in use for decades, its performance and high success rates in applications like perforation repair, apexification, and root-end filling are extensively documented.20 It creates an excellent, biocompatible seal that promotes a normal healing response, including the formation of new cementum over the material-root interface.26 Its ability to set reliably in the moist clinical environment remains a key benefit.20
Disadvantages: ProRoot MTA embodies all the classic drawbacks of first-generation MTA. Its setting time is long, approximately 3-4 hours, which complicates clinical workflow.34 Its handling characteristics are frequently cited as difficult, and it has a significant and well-documented potential to cause aesthetic tooth discoloration due to its bismuth oxide content.30 Furthermore, it is a costly material compared to traditional alternatives.36

3.2 MTA Angelus (Angelus)

Manufacturer & Formulation: Developed by Angelus (Londrina, Brazil), MTA Angelus is a popular alternative to ProRoot MTA, also supplied as a powder/liquid system in both white and grey formulations.28 It is often packaged in sealed bottles, allowing for multiple uses from a single vial.28
Composition: Like ProRoot, it is a tricalcium silicate-based material that uses bismuth oxide as its radiopacifier.28
Key Advantage (Faster Set): The defining innovation of MTA Angelus is its significantly reduced setting time. By lowering the concentration of calcium sulfate (gypsum) in the powder, the final setting time is reduced to approximately 15 minutes.28 This is a major clinical advantage, making it more suitable for single-visit procedures and reducing the risk of the material being dislodged or washed out before it has set.8
Disadvantages: While it addresses the setting time issue, MTA Angelus still requires manual mixing, which can introduce variability in consistency. More importantly, because it retains bismuth oxide as the radiopacifier, it carries the same risk of causing tooth discoloration as ProRoot MTA.16 Some studies have also suggested it may have higher porosity and solubility than other formulations, which could potentially impact the long-term integrity of the seal.38

3.3 Biodentine (Septodont)

Manufacturer & Formulation: Biodentine, from Septodont, represents a significant evolution in calcium silicate technology. It is supplied as a pre-dosed powder in a capsule and a liquid in a pipette. The components are mixed in a triturator (amalgamator), which produces a consistent, creamy, putty-like mix that is easier to handle than manually mixed MTA.37
Composition: The powder consists of a high-purity tricalcium silicate, dicalcium silicate, and calcium carbonate. Critically, it uses zirconium oxide as the radiopacifier, eliminating the bismuth oxide responsible for staining.6 The liquid is an aqueous solution containing calcium chloride, which acts as a setting accelerator, and a water-soluble polymer to improve handling.37
Advantages:
Fast Setting Time: The inclusion of calcium chloride accelerates the hydration reaction, resulting in a short setting time of 9-12 minutes, which is highly advantageous clinically.6
No Discoloration: The use of zirconium oxide as the radiopacifier effectively solves the staining problem associated with MTA, making Biodentine a preferred choice for use in the aesthetic zone.6
Superior Mechanical Properties: Biodentine exhibits a compressive strength and modulus of elasticity that are remarkably similar to those of natural dentin. This has led to its branding as a "dentine substitute," suitable for use as a base material under permanent restorations in both the crown and root.43
Improved Handling: The automated trituration process ensures a predictable and user-friendly consistency, overcoming one of the main complaints about traditional MTA.6
Disadvantages: The radiopacity of Biodentine (equivalent to approximately 3.5 mm of aluminum) is lower than that of MTA, which can make it more difficult to distinguish from surrounding tooth structure on radiographs.42 Although handling is improved, it still requires a distinct mixing step before placement.

3.4 The Premixed Bioceramic Sealer Category: EndoSequence BC Sealer, TotalFill BC Sealer, and iRoot SP

Manufacturers & Branding: This category represents a major leap in handling and delivery. The technology was first introduced as iRoot SP (Innovative BioCeramix, Canada) and is now marketed under several brand names, most notably EndoSequence BC Sealer (Brasseler USA) and TotalFill BC Sealer (FKG Dentaire, Switzerland).18 These products are based on the same core technology and are often used interchangeably in research literature.
Formulation: The key innovation is their delivery system. They are premixed, injectable pastes supplied in a syringe with fine applicator tips.1 This ready-to-use format completely eliminates manual mixing, ensuring a perfect consistency every time and dramatically simplifying the clinical procedure.
Composition: The patented formulation consists of nano-particulate calcium silicates, calcium phosphate, calcium hydroxide, and a non-staining radiopacifier, typically zirconium oxide and sometimes tantalum oxide.1
Advantages:
Optimal Handling and Ease of Use: The premixed, injectable format is a transformative clinical advantage, saving time and eliminating the variability and mess of manual mixing.13
Zero Shrinkage and Hydrophilic Nature: Like other bioceramics, these sealers are hydrophilic and use moisture from the dentinal tubules to initiate their setting reaction, resulting in zero shrinkage and an intimate adaptation to the canal walls.13
Excellent Biocompatibility and Bioactivity: They demonstrate robust osteogenic potential and have been shown to be significantly less cytotoxic than popular resin-based sealers like AH Plus.1
True Chemical Bonding (Monoblock Obturation): These sealers are designed to be used with bioceramic-coated gutta-percha points (e.g., BC Points, TotalFill BC Points). The sealer chemically bonds to both the dentin and the bioceramic particles on the cone, creating a truly gap-free, bonded "monoblock" obturation that enhances the seal and may increase the fracture resistance of the root.13
Disadvantages:
Difficult Retreatability: This is the most significant and frequently cited drawback. The strong chemical bond to the dentin walls makes these sealers extremely difficult to remove for endodontic retreatment or post-space preparation. This presents a major clinical dilemma, trading superior primary obturation for potential future complications.4
High Solubility (Controversial): The literature on the solubility of these premixed sealers is contradictory. Some in vitro studies have reported a high degree of solubility that fails to meet ANSI/ADA standards, raising concerns about the long-term stability of the seal.21 Conversely, other studies have found their solubility to be within acceptable limits.53 This discrepancy remains a key point of scientific debate and clinical concern.

3.5 BioRoot RCS (Septodont)

Manufacturer & Formulation: Also from Septodont, BioRoot RCS is a powder/liquid system specifically formulated for use as a root canal sealer, leveraging the same core technology as its sister product, Biodentine.47
Composition: The powder is composed of tricalcium silicate and zirconium oxide (for radiopacity), while the liquid is an aqueous solution of calcium chloride and a polycarboxylate.56 A key feature is that it is entirely resin-free and monomer-free, which contributes to its biocompatibility and lack of shrinkage.55
Advantages: BioRoot RCS offers outstanding adhesion to both dentin and gutta-percha points. It is hydrophilic, exhibits no shrinkage, and does not cause tooth discoloration due to its zirconium oxide content.55 It is designed to be used with simple, cold obturation techniques, such as the single-cone technique, making it efficient and cost-effective as it does not require specialized heating equipment.58
Disadvantages: As a powder/liquid system, it still requires manual mixing, unlike the premixed syringe-based sealers. Some comparative studies have suggested that BioRoot RCS may exhibit less antimicrobial activity against Enterococcus faecalis compared to other bioceramic sealers.59

3.6 Other Notable Products

MTA Fillapex (Angelus): This product is an MTA-based root canal sealer that incorporates resin into its formulation.16 It is a two-paste system that is easier to mix and handle than traditional MTA.60 However, this modification comes at a cost. The inclusion of resin components has been shown to reduce the material's bioactivity, decrease its pH, and lower its ability to release calcium ions compared to pure calcium silicate cements.38 Studies have also reported high solubility and moderate to severe cytotoxicity, particularly when freshly mixed.53
NeoMTA Plus (Avalon Biomed): This is a newer generation powder/liquid MTA formulation designed to address the discoloration issue. It uses tantalum oxide as its radiopacifier instead of bismuth oxide, thus avoiding staining while maintaining high radiopacity.38 It also features improved handling characteristics compared to early MTA products.

Table 1: Comparative Overview of Major Bioceramic and MTA Products

Product Name Manufacturer Formulation Primary Composition Radiopacifier Setting Mechanism Approx. Setting Time Key Advantages Key Disadvantages ProRoot MTA Dentsply Sirona Powder/Liquid (Manual Mix) Tricalcium Silicate Bismuth Oxide Hydration 2-4 hours Extensive long-term clinical data, excellent biocompatibility Long setting time, difficult handling, causes tooth discoloration, high cost MTA Angelus Angelus Powder/Liquid (Manual Mix) Tricalcium Silicate Bismuth Oxide Hydration ~15 minutes Fast setting time, good biocompatibility Causes tooth discoloration, requires manual mixing, higher porosity/solubility in some studies Biodentine Septodont Powder/Liquid (Capsule Trituration) High-Purity Tricalcium Silicate Zirconium Oxide Hydration (accelerated) 9-12 minutes Fast setting, no discoloration, dentin-like mechanical properties, improved handling Lower radiopacity, requires trituration step EndoSequence BC Sealer / TotalFill BC Sealer / iRoot SP Brasseler USA / FKG Dentaire / Innovative BioCeramix Premixed Injectable Syringe Calcium Silicates, Calcium Phosphate Zirconium Oxide, Tantalum Oxide Hydration ~4 hours (moisture dependent) Superior handling (ready-to-use), zero shrinkage, bonds to dentin & BC points (monoblock) Extremely difficult to retreat, controversial reports of high solubility BioRoot RCS Septodont Powder/Liquid (Manual Mix) Tricalcium Silicate Zirconium Oxide Hydration (accelerated) < 4 hours Excellent adhesion, no discoloration, no shrinkage, ideal for cold obturation techniques Requires manual mixing, potentially lower antimicrobial activity than others MTA Fillapex Angelus Paste/Paste (Manual Mix) MTA in a Salicylate Resin Base Bismuth Oxide Hydration & Chemical ~2 hours Easy handling and flow Reduced bioactivity, high solubility, cytotoxicity due to resin content, causes discoloration Nishika Canal Sealer BG Multi Nippon Yakushin (Nishika) Paste/Paste + Optional Powder Bioactive Glass, Calcium Silicate Glass Bismuth Subcarbonate Acid-Base Reaction 60-90 minutes Excellent washout resistance, predictable setting time, versatile/adjustable consistency Requires manual mixing, contains bismuth compound (potential for discoloration)

Part IV: Special Focus – An In-Depth Evaluation of Nishika Canal Sealer BG Multi

While the majority of advancements in bioceramic technology have focused on refining the original MTA-based hydration chemistry, Nishika Canal Sealer BG Multi, developed by Nippon Yakushin (Nippon Shika Yakuhin Co., Ltd.) in Japan, represents a significant and divergent evolutionary path.65 This material utilizes a different core component—Bioactive Glass—and a distinct setting mechanism, which confers a unique set of clinical advantages.

4.1 Manufacturer and Product Overview

Nishika Canal Sealer BG Multi is a versatile bioceramic system marketed for a wide range of endodontic procedures.65 Its defining feature is its adaptability. The product is supplied as a two-paste system that, when mixed, forms an ideal root canal sealer. However, it also includes a separate powder that can be incorporated into the paste mixture to alter its viscosity.65 This allows the clinician to change the consistency from a flowable sealer to a thicker, putty-like material suitable for pulp capping, perforation repair, pulpotomies, or root-end fillings.65

4.2 Unique Composition and Setting Mechanism

The composition of Nishika Canal Sealer BG Multi sets it apart from tricalcium silicate-dominant materials like MTA and Biodentine.

Composition:
Paste A: Contains Bismuth subcarbonate (radiopacifier), Fatty acid, and Silicon dioxide.65
Paste B: Contains Calcium silicate glass (a form of Bioactive Glass), Magnesium oxide, and Purified water.65
Powder (for adjusting consistency): Composed of Calcium silicate glass and Calcium hydroxide.65

The most fundamental difference lies in its setting reaction. Whereas MTA and its derivatives rely on a slow, moisture-dependent hydration reaction, Nishika Canal Sealer BG Multi sets via a more rapid and predictable acid-base reaction.65 The reaction occurs between the fatty acids in Paste A and the bases (magnesium oxide from Paste B and, if added, calcium hydroxide from the powder).65 This alternative chemistry is the source of its most significant clinical advantages.

4.3 Analysis of Key Advantages Stemming from its Unique Chemistry

The decision to engineer this material around an acid-base reaction rather than a hydration reaction appears to be a direct and intentional strategy to solve the most persistent clinical problems associated with MTA-type materials.

Advantage 1: Unparalleled Washout Resistance

The slow, water-dependent setting of MTA makes it highly vulnerable to being washed away by blood or tissue fluids before it can harden, a common cause of clinical failure in surgical and perforation repair scenarios.16 The acid-base reaction of Nishika Canal Sealer BG Multi is not dependent on the slow absorption of environmental water. As a result, the material exhibits excellent washout resistance immediately after mixing.65 It maintains its shape and integrity even when placed in a wet environment, providing greater predictability and reliability in challenging clinical situations where moisture control is compromised.66 This property allows a clinician to proceed with subsequent restorative steps, such as placing a liner or composite, without waiting for the material to fully cure, provided it is in a condensable putty consistency.65

Advantage 2: Predictable Setting Time and Consistent Handling

A significant drawback of hydration-based sealers is that their setting time can be highly variable, depending on the amount of moisture available in the dentinal tubules. In an unusually dry canal, the setting time can be prolonged significantly.15 Because the setting of Nishika Canal Sealer BG Multi is governed by the controlled chemical reaction of its mixed components, its setting time is far more predictable (approximately 60 to 90 minutes, depending on the powder-to-paste ratio).65 This removes a major variable from the clinical procedure. Furthermore, the two-paste system provides a smooth, constant consistency upon mixing, avoiding the "sandy" texture often associated with MTA.65

Advantage 3: Versatility and Clinician-Controlled Consistency

The two-component (paste + optional powder) system is unique in the bioceramic market. It provides the clinician with direct control over the material's handling properties. By varying the amount of powder added to the paste, the consistency can be tailored for the specific clinical task at hand—from a "thin cream" for sealer applications to a "thick cream" or a moldable "putty" for repair and pulp capping procedures.65 This versatility allows a single product to fulfill multiple roles in the endodontic armamentarium, which can simplify inventory and reduce costs. The ability to create a putty on demand with excellent moldability is particularly advantageous for vital pulp therapy, where precise placement and adaptation are critical.65

Advantage 4: Proven Biocompatibility and Sealing Ability

Despite its different chemistry, the material retains the core benefits of bioactivity. The presence of Bioactive Glass and calcium silicate glass ensures that upon contact with tissue fluids, the sealer forms a layer of apatite on its surface.65 This process also forms apatite tags within the dentinal tubules, creating a strong integration with the dentin and ensuring a high-quality seal.65 In-vivo and in-vitro studies have confirmed its high biocompatibility, demonstrating minimal inflammation in subcutaneous tissues and the ability to induce the formation of a reparative dentin bridge in pulp capping models.65 Comparative studies using confocal microscopy have shown that Nishika Canal Sealer BG has superior sealer adaptation and deeper penetration into dentinal tubules compared to some other bioceramic sealers, such as EndoSeal MTA.71

4.4 Review of Clinical Performance Data

Clinical studies have begun to validate the performance of Nishika Canal Sealer BG Multi.

Postoperative Pain: A randomized controlled trial comparing it to the epoxy resin-based sealer AH Plus found that the Nishika BG sealer group experienced significantly lower levels of postoperative pain at the 24-hour mark.67 A separate double-blinded RCT confirmed this finding, showing lower pain scores than AH Plus at 6 and 24 hours, although it reported slightly higher pain scores than another bioceramic, Bio-C Sealer Ion+.76 This suggests a tangible clinical benefit in terms of patient comfort compared to traditional resin sealers.
Survival and Healing: A 3-year retrospective follow-up study on teeth obturated with the sealer demonstrated a high survival rate of 91%, indicating good long-term clinical performance.65

In conclusion, Nishika Canal Sealer BG Multi should not be categorized simply as another calcium silicate cement. Its formulation based on Bioactive Glass with an acid-base setting reaction represents a distinct technological approach. This different chemistry directly translates into clinically significant advantages—notably superior washout resistance and predictable setting—that address the primary weaknesses of hydration-based materials, making it a uniquely suited option for specific and challenging clinical scenarios.

Part V: Comparative Clinical Evidence and Performance Analysis

The transition of bioceramic materials from the laboratory to clinical practice has been accompanied by a growing body of research comparing their performance against each other and against traditional endodontic materials. This section synthesizes the available evidence on key clinical metrics, including sealing ability, postoperative outcomes, and the critical issue of retreatability.

5.1 Sealing Ability, Dentin Penetration, and Microleakage

A primary function of any root canal sealer is to prevent microleakage by creating a hermetic seal. Bioceramic materials are theoretically superior in this regard due to their unique properties.

Bioceramics vs. Traditional Sealers: Evidence generally supports the superior sealing capabilities of bioceramics. Their hydrophilic nature allows for intimate adaptation to moist dentin walls, while their lack of shrinkage and ability to form a chemical bond via hydroxyapatite precipitation create a more durable and integrated seal.18 A notable study demonstrated that a bioceramic sealer used with a simple single-cone obturation technique provided a significantly better apical seal (less dye penetration) than a gold-standard epoxy resin-based sealer used with a warm vertical condensation technique.78 This suggests that the material's chemistry may be more important for achieving a quality seal than the complexity of the obturation technique.
Inter-Bioceramic Comparisons: Performance can vary among different bioceramic formulations. One in-vitro study evaluating furcation repair materials found that Biodentine demonstrated the best sealing ability (least dye leakage), outperforming ProRoot MTA and RetroMTA.79 In contrast, another study using a fluid filtration model found that ProRoot MTA showed superior sealing ability over a one-month period compared to Biodentine.80 When evaluating dentin penetration, a key factor in micromechanical retention and sealing, one study found that CeraSeal RC penetrated significantly deeper into dentinal tubules than Bio-C and MTA Fillapex.81 Similarly, Nishika Canal Sealer BG was shown to have better sealer adaptation and deeper penetration than EndoSeal MTA in oval canals.71 These varied results highlight that while bioceramics as a class perform well, specific formulation and handling characteristics can influence outcomes.

5.2 Postoperative Pain and Periapical Healing

A logical extension of the superior biocompatibility and lower cytotoxicity of bioceramics is the expectation of reduced postoperative pain and enhanced periapical healing.

Bioceramics vs. Traditional Sealers: Several randomized controlled trials (RCTs) support this hypothesis. Studies have consistently shown that patients treated with bioceramic sealers report significantly lower postoperative pain scores, particularly within the first 24 to 48 hours, compared to those treated with resin-based or ZOE sealers.14 Radiographic follow-up in these trials also tends to show faster and more complete healing of periapical lesions in the bioceramic groups, with higher overall treatment success rates.14
Meta-Analysis Findings: Interestingly, when the results of multiple individual trials are pooled and analyzed in systematic reviews and meta-analyses, this clear advantage becomes less distinct. Several high-level reviews have concluded that there is no statistically significant difference in patient-reported postoperative pain (as measured by Visual Analog Scale scores) between bioceramic and resin-based sealer groups at various follow-up intervals.84 This discrepancy between individual trials and meta-analyses suggests that while a trend towards lower pain with bioceramics may exist, the effect might not be large or consistent enough to be statistically significant across diverse patient populations and study designs. This indicates that for routine cases without significant sealer extrusion, the primary drivers of postoperative pain are likely multifactorial, including mechanical instrumentation, irrigation techniques, and hydraulic pressures during obturation, rather than the inherent cytotoxicity of the sealer alone. The profound biological advantages of bioceramics may therefore be most clinically impactful in compromised situations where a large volume of material is in direct contact with periapical tissues, such as in cases of significant overfill, perforation repairs, or apexification procedures.

Table 2: Summary of Comparative Clinical Studies on Postoperative Pain and Healing

Study Reference/Type Sealers Compared Primary Outcome Measured Key Findings & Statistical Significance Source(s) RCT Bioceramic Sealer vs. Traditional Sealer (ZOE or Resin) Postoperative Pain (VAS), Periapical Healing (Radiographic), Success Rate Bioceramic group had significantly lower pain scores, faster/more complete healing, and higher success rates (90% vs. 75%). (p < 0.05) 82 RCT Bioceramic (Endosequence BC) vs. Calcium Hydroxide (Sealapex) Periapical Lesion Size Reduction, Swelling Bioceramic group showed significantly greater reduction in lesion size at 6 months. (p < 0.05) 14 Double-Blinded RCT Nishika Canal Sealer BG vs. AH Plus vs. Bio-C Sealer Ion+ Postoperative Pain (VAS), Analgesic Intake Bio-C Sealer showed the least pain, followed by Nishika BG, then AH Plus. Difference was significant at 6h and 24h (p < 0.05), but not later. 76 RCT Nishika Canal Sealer BG vs. AH Plus Postoperative Pain (VAS) Nishika BG sealer resulted in significantly lower pain levels at the 24-hour interval compared to AH Plus. 67 Systematic Review & Meta-Analysis Resin-based vs. Bioceramic-based Sealers Postoperative Pain (VAS) No statistically significant difference in VAS scores between the two sealer types at 24 and 48 hours postoperatively. (p > 0.05) 84 Systematic Review & Meta-Analysis Resin-based vs. Bioceramic-based Sealers Postoperative Pain (VAS) No significant differences in VAS scores between resin-based and bioceramic sealers at 6, 12, 24, and 48 hours. 85

5.3 The Critical Disadvantage: Retreatability

Despite their numerous advantages, the most significant clinical challenge associated with modern bioceramic sealers is the difficulty of removal.

The Challenge of a Bonded Seal: The very property that makes premixed bioceramic sealers so effective—their ability to chemically bond to the dentin wall—becomes a major liability when endodontic retreatment is required.22 Unlike traditional sealers that form a physical interface, bioceramics create an integrated, mineralized layer that cannot be easily dissolved by solvents or removed with conventional files. This makes gaining access to the apical portion of the canal for re-instrumentation or preparing a canal for a post extremely challenging and time-consuming.4 This represents a critical clinical trade-off: enhanced primary success versus compromised secondary treatment options.
Comparative Removal Studies: The evidence on retreatability is nuanced. A systematic review found that the average time required to remove the filling material was indeed longer for bioceramic sealers compared to conventional ones.86 However, the same review made a paradoxical finding: after the difficult retreatment procedure was completed, canals previously obturated with bioceramic sealers had a significantly lower amount of remaining sealer residue compared to canals obturated with conventional sealers.86 This suggests that while the removal process is more arduous, it may ultimately be more thorough. Nevertheless, the difficulty and unpredictability of removal remain a primary concern for clinicians considering the routine use of these bonded sealers.

Part VI: Expert Analysis and Concluding Remarks

6.1 Synthesis of Findings: An Evolutionary Trajectory

The landscape of endodontic obturation materials has followed a clear and logical evolutionary trajectory over the past thirty years. The journey began with the introduction of Mineral Trioxide Aggregate (MTA), a flawed but revolutionary material that established the clinical viability of bioactive, regenerative endodontics. The well-documented disadvantages of MTA—its prolonged setting time, difficult handling, and propensity for tooth discoloration—served as the precise developmental roadmap for the next generation of materials. Subsequent innovations can be broadly categorized into two streams. The first involves incremental improvements to the original MTA hydration chemistry. Materials like MTA Angelus targeted the long setting time, while Biodentine addressed setting time, handling, and discoloration simultaneously by refining the purity of the tricalcium silicate and replacing the problematic bismuth oxide radiopacifier. The second, more transformative stream involved a paradigm shift in delivery and formulation. The advent of premixed, injectable bioceramic sealers like EndoSequence BC Sealer completely eliminated the challenges of manual mixing, offering unparalleled ease of use. Concurrently, materials like Nishika Canal Sealer BG Multi emerged, representing a divergent path by employing an alternative Bioactive Glass chemistry and an acid-base setting reaction to solve the core MTA problems of washout and unpredictable setting from a different scientific approach. The driving force throughout this evolution has been a consistent, clinically-driven demand to mitigate the practical drawbacks of the preceding generation while preserving or enhancing bioactivity.

6.2 Clinical Recommendations and Material Selection

The availability of a diverse range of bioceramic materials allows for a nuanced, indication-specific approach to material selection. No single material is ideal for all clinical scenarios; rather, the choice should be guided by the specific demands of the case.

Routine Root Canal Obturation: For standard obturation, the choice often lies between a premixed injectable bioceramic sealer (e.g., EndoSequence BC, TotalFill BC) and a modern powder/liquid system (e.g., BioRoot RCS). The premixed sealers offer supreme ease of use and the potential for a bonded monoblock when used with coated cones. However, this must be weighed against the significant and unpredictable difficulty of future retreatment. For cases with a high probability of requiring future intervention (e.g., complex anatomy, questionable periodontal status), a more easily retreatable system like BioRoot RCS with gutta-percha may be a more prudent choice.
Perforation Repair: In cases of iatrogenic perforation, especially in moisture-rich environments like a furcation, a material with excellent washout resistance is paramount. Nishika Canal Sealer BG Multi, due to its acid-base set, is an outstanding candidate. Alternatively, fast-setting materials like Biodentine or MTA Angelus can also perform well by achieving a rapid initial set that resists dislodgement.
Vital Pulp Therapy (Pulp Capping/Pulpotomy): The primary requirements for this application are proven biocompatibility, the ability to induce a high-quality dentin bridge, and a reasonably fast set to allow for immediate placement of the final restoration. Biodentine is an excellent choice due to its dentin-like mechanical properties and 9-12 minute setting time. MTA also has a long track record of success but is hampered by its slow set and potential for discoloration.
Apexification: Creating a reliable apical plug in an immature tooth with an open apex requires a material that can be condensed into place and provides a durable seal. The putty-like consistency of mixed MTA or Biodentine is ideal for this purpose. The adjustable consistency of Nishika Canal Sealer BG Multi also allows for the creation of a suitable putty for this application.
Aesthetic Considerations: For any procedure in the anterior dentition (e.g., pulp capping, perforation repair, or root-end filling), the use of materials containing bismuth oxide should be avoided. Formulations that use non-staining radiopacifiers such as zirconium oxide (e.g., Biodentine, EndoSequence BC, BioRoot RCS) or tantalum oxide (e.g., NeoMTA Plus) are the materials of choice to prevent iatrogenic discoloration.

6.3 Future Outlook: The Next Frontier in Endodontic Biomaterials

While current bioceramic materials represent a major advancement, the quest for the ideal endodontic material continues. The literature highlights several key areas for future research and development. There is a clear need to enhance the antimicrobial activity of these materials, particularly against resilient, biofilm-forming bacteria like Enterococcus faecalis, as the current antibacterial effect is primarily due to high pH and may be transient.8 Further improvements in mechanical properties, a reduction in the solubility of certain formulations, and a significant reduction in cost are also necessary for broader adoption.8 Perhaps the most pressing challenge is solving the retreatability dilemma. The development of a bioactive sealer that can form a strong bond with dentin but can also be selectively dissolved or softened by a specific solvent or method would be a transformative innovation. The continued application of nanotechnology to refine particle size and control material properties holds significant promise for achieving these future goals, pushing the field ever closer to a truly regenerative and predictable standard of endodontic care.3 Nguồn trích dẫn 1. Clinical applications of bioceramic materials in endodontics, truy cập vào tháng 10 26, 2025, https://endopracticeus.com/wp-content/uploads/2015/02/CE-Ree.pdf 2. Bioceramics As Root Canal Sealers: A Literature Review – Journal of Pharmaceutical Negative Results, truy cập vào tháng 10 26, 2025, https://www.pnrjournal.com/index.php/home/article/download/9982/13904/11923 3. Bioceramics in Endodontics: Limitations and Future Innovations—A Review – MDPI, truy cập vào tháng 10 26, 2025, https://www.mdpi.com/2304-6767/13/4/157 4. Bioceramic Usage in Endodontics – American Association of Endodontists, truy cập vào tháng 10 26, 2025, https://www.aae.org/specialty/bioceramic-usage-in-endodontics/ 5. 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Pharmacophore EVALUATION OF THE USE OF BIOCERAMICS IN ENDODONTIC MANAGEMENT, LITERATURE REVIEW, truy cập vào tháng 10 26, 2025, https://pharmacophorejournal.com/storage/files/article/7be2ba55-2012-4f41-b914-1001ea9e6e91-Ber6as8WzgVSoZJi/cUqlSMu9gz48kLY.pdf 12. The setting mechanism of mineral trioxide aggregate – PMC – NIH, truy cập vào tháng 10 26, 2025, https://pmc.ncbi.nlm.nih.gov/articles/PMC5573456/ 13. EndoSequence® BC Sealer™ – Brasseler USA – Dental, truy cập vào tháng 10 26, 2025, https://brasselerusadental.com/products/endosequence-bc-sealer 14. A comparative clinical study of bioceramic and calcium hydroxide based root canal sealer in the treatment of non-vital permanen – Semantic Scholar, truy cập vào tháng 10 26, 2025, https://pdfs.semanticscholar.org/3078/076e5da84ad5bdd6db74840b43cc55c995d0.pdf 15. EndoSequence BC Sealer – Brasseler USA, truy cập vào tháng 10 26, 2025, https://brasselerusadental.com/wp-content/files/B-3114D-EndoSequence-BC-Sealer-DFU.pdf 16. 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