Bioceramic Sealers vs. Resin-Based Sealers: Is it Worth the Switch?

The selection of root canal sealer is a fundamental clinical decision that directly impacts treatment success, retreatment feasibility, and patient outcomes. This comprehensive guide compares two dominant sealer categories—epoxy resin-based sealers (exemplified by AH Plus) and bioceramic sealers (such as EndoSequence BC Sealer)—by analyzing their composition, sealing ability, physicochemical properties, biocompatibility, and clinical performance. While both materials demonstrate high clinical success rates, each presents distinct advantages and limitations that dental practitioner must understand to make evidence-based material selections. The key finding is that superior laboratory performance does not always guarantee superior clinical outcomes; your technical skill and case selection remain paramount, though bioceramic sealers offer unique biological advantages while epoxy resin-based sealers provide greater predictability and solubility stability.

Quick Key Takeaways

• AH Plus (epoxy resin) established gold standard with predictable handling and low solubility meeting ISO standards
• EndoSequence BC (bioceramic) = newer material with superior biocompatibility but struggles with solubility and setting time in some formulations
• Clinical success depends more on operator technique than material choice — both achieve 96% success rates when used correctly
• In vitro superiority ≠ clinical superiority — laboratory advantages don't always translate to better real-world outcomes
• Material choice has retreatment implications — epoxy faster but leaves residue (46.2%); bioceramic slower but cleaner removal (0% residue)

The Critical Role of Sealers in Endodontic Success

The fundamental goal of root canal therapy is to debride, disinfect, and achieve a complete, three-dimensional seal of the root canal system. This seal prevents bacterial reinfection from the oral environment and entombs residual microorganisms, ensuring long-term treatment success.

Gutta-percha serves as the universally accepted “gold standard” core filling material, yet it possesses one critical limitation: it cannot adhere to root canal dentin. This inability to bond necessitates a root canal sealer to:

•           Fill microscopic voids between gutta-percha and the canal wall

•           Penetrate accessory canals and lateral canals

•           Adapt to anatomical irregularities throughout the canal system

In contemporary endodontics, two sealer classes dominate clinical practice and academic discussion:

1.         Epoxy resin-based sealers — the established benchmark with extensive clinical track records

2.         Bioceramic sealers — innovative materials prized for superior biocompatibility and unique chemistry

Understanding the properties, performance characteristics, and clinical implications of each sealer class is essential for making informed, case-specific decisions throughout your career.

Foundational Properties: Composition and Setting Mechanisms

A sealer’s clinical behavior—from handling characteristics to long-term stability—is dictated by its fundamental chemistry. Understanding composition and setting reactions provides the foundation for interpreting clinical performance across diverse clinical scenarios.

Epoxy Resin-Based Sealers: The Established Gold Standard

Epoxy resin-based sealers, exemplified by AH Plus, represent the benchmark against which all new sealers are compared. Their established clinical reputation stems from predictable chemistry and well-documented physicochemical properties.

Composition and Chemical Structure

These materials are supplied as a two-paste system:

•           Paste 1 contains epoxide (epoxy oligomer resin) and hexamethylenetetramine

•           Paste 2 contains hexamethylenetetramine and radiopacifiers (calcium tungstate, zirconium oxide)

When mixed, the two components undergo polymerization, creating a rigid, stable material with excellent dimensional properties.

Setting Mechanism

The epoxide and hexamethylenetetramine react to form a highly cross-linked polymer network. This chemical bond creates:

•           Excellent dimensional stability

•           Low solubility that meets or exceeds ISO standards

•           Predictable, long-term material properties

•           Resistance to degradation in the oral environment

Fundamental Properties

The inherent hydrophobic nature of epoxy resin sealers is critical to understanding their clinical behavior. This property means they repel moisture, which has significant implications for their interaction with the inherently moist environment of the root canal system.

Bioceramic Sealers: A Paradigm Shift in Sealer Chemistry

Bioceramic sealers such as EndoSequence BC Sealer and BioRoot RCS represent a fundamental departure from traditional resin-based chemistry, leveraging the tooth’s natural moisture to initiate their setting reaction.

Composition and Chemical Structure

These are typically premixed, single-paste materials containing:

•           Calcium silicates (provide bioactivity and biocompatibility)

•           Calcium phosphates (enhance chemical bonding to dentin)

•           Radiopacifiers (zirconium oxide for visibility on radiographs)

•           Hydrophilic particles that actively attract and utilize water

Setting Mechanism

The defining characteristic of bioceramic sealers is their hydrophilic nature. They require moisture from the root canal environment to initiate hydration reactions:

•           Water from dentinal tubules triggers hydration of calcium silicates

•           This process produces calcium hydroxide and hydroxyapatite

•           Hydroxyapatite formation creates a chemical bond with the mineral components of root dentin

•           The result is a “monoblock” where the sealer becomes part of the tooth structure itself

Fundamental Properties

Unlike resin-based sealers, bioceramics achieve retention through chemical bonding rather than mechanical retention alone. This distinction has profound implications for sealing ability, biocompatibility, and retreatability.

Comparative Analysis of Sealing Efficacy: What the Evidence Reveals

The ultimate measure of a root canal sealer is its ability to create and maintain a fluid-tight seal over extended time periods. Evaluating sealing ability is complex, and the scientific literature presents a nuanced picture that appears contradictory at first glance. Understanding why these apparent contradictions exist is crucial for interpreting evidence throughout your career.

Laboratory Performance: Superior Sealing Properties of Bioceramics

A significant body of in vitro research demonstrates that bioceramic sealers provide superior sealing ability under controlled laboratory conditions.

Evidence from Fluid Filtration Studies

A 2020 study by Asawaworarit et al. used fluid filtration and scanning electron microscopy (SEM) to compare EndoSequence BC Sealer with AH Plus. The results showed:

•           Significantly better sealing ability of the bioceramic sealer at all tested time points

•           Superior adaptation to the root canal wall

•           Deeper penetration into dentinal tubules, particularly in the critical apical third

•           Gap-free interface formation resulting from slight expansion upon setting

These laboratory findings directly reflect the material’s inherent hydrophilic properties. The sealer actively seeks out and flows into moist dentinal tubules while its slight expansion (approximately 0.20% upon setting) physically closes marginal gaps.

Clinical Validation of Laboratory Findings

A 2025 randomized controlled trial by Sharma et al. reinforced the clinical relevance of these laboratory findings, reporting that bioceramic sealers significantly reduced microbial leakage compared to resin-based counterparts. This suggests that superior laboratory sealing properties may translate to better clinical performance in preventing bacterial microleakage.

Broader Clinical Outcomes: Why Large-Scale Studies Show Different Results

In contrast to studies examining specific material properties, larger-scale clinical analyses reveal a more nuanced picture.

Meta-Analysis Findings

A 2023 systematic review and meta-analysis by Rekha et al. synthesized data from numerous studies and concluded:

•           No significant difference in overall sealing ability between bioceramic and epoxy resin-based sealers

•           Apparent laboratory advantages did not consistently translate to statistically significant clinical superiority

•           Both sealer types demonstrated acceptable clinical performance

Real-World Clinical Outcomes

A 2025 retrospective clinical study by Bani-Younes et al. evaluated actual treatment outcomes and found:

•           Comparable clinical and radiographic outcomes for both sealer types

•           Overall success rate of 96% across all treatment groups

•           No statistically significant difference between bioceramic and resin-based sealer groups

Understanding the Evidence: A Framework for Critical Thinking

As a future clinician, understanding why different evidence types lead to different conclusions is essential for making evidence-based decisions. Consider this analogy:

In vitro studies (like Asawaworarit et al.) are laboratory bench tests that reveal a material’s peak potential in controlled conditions. They demonstrate:

•           Inherent hydrophilicity and superior flow properties

•           Chemical bonding capacity to dentin

•           Slight expansion that improves adaptation

•           Optimal performance under ideal circumstances

Large-scale clinical studies (like Bani-Younes et al.) are real-world performance assessments where multiple variables influence outcomes:

•           Clinician skill and experience

•           Case complexity and tooth anatomy

•           Patient factors and healing capacity

•           Long-term follow-up and evaluation methods

The data are not contradictory—they are complementary. They teach us that while inherent material properties matter, clinical success depends equally on proper technique, case selection, and operator skill.

Key Takeaway: While bioceramics may possess inherently superior sealing properties in vitro, overall clinical success is multifactorial. Beyond sealing ability, other physicochemical properties significantly influence material selection and treatment outcomes.

Key Physicochemical Properties: Clinical Implications and Trade-Offs

Beyond sealing ability, a sealer’s clinical utility and long-term success depend on physicochemical properties that directly affect treatment outcomes. These properties—solubility, dimensional stability, setting time, and pH—are not abstract laboratory measurements; they have concrete clinical consequences.

Property	Epoxy Resin-Based Sealers (e.g., AH Plus)	Bioceramic Sealers (e.g., EndoSequence BC)	Clinical Significance
Solubility	Low solubility consistently meeting ISO standards (less than 3% weight loss)	High solubility in many formulations; many bioceramic sealers exceed ISO solubility limits (Silva et al., 2021)	A sealer that dissolves over time creates voids that invite microleakage and eventual failure. High solubility is a critical vulnerability that undermines long-term seal integrity. This is the single greatest clinical concern for some bioceramic formulations.
Dimensional Stability	Exhibits slight polymerization shrinkage as the cross-linked polymer forms	Demonstrates slight expansion (approximately 0.20%) upon setting due to moisture absorption and hydroxyapatite formation	Sealer shrinkage creates potential sources of microleakage. Bioceramic expansion represents a significant advantage by improving adaptation and forming gap-free interfaces. Any amount of resin shrinkage is problematic in the confined space of the root canal.
Setting Time	Predictable and long—approximately 18 hours for complete polymerization	Unpredictable and extremely long; Lee et al. (2017) found some formulations failed to set after one month under humid in vitro conditions	Unpredictable setting time is clinically unacceptable. A sealer that fails to set provides a false sense of security while offering no actual seal. This fundamental material failure compromises the entire foundation of the restoration and tooth longevity.
Alkalinity (pH)	Mildly alkaline to neutral after the setting reaction completes	Highly alkaline during setting (pH greater than 11.5) due to calcium hydroxide formation	The high pH of bioceramics during setting enables strong antibacterial properties that help disinfect the canal system. Epoxy resin sealers provide minimal antimicrobial action, relying instead on prior mechanical disinfection.

Solubility: A Critical Distinction

Epoxy Resin-Based Sealers demonstrate low solubility that meets or exceeds ISO standards. This property ensures that the seal remains stable over decades, preventing fluid infiltration that could lead to treatment failure.

Bioceramic Sealers present a concerning pattern of solubility issues in clinical practice. Research by Silva et al. (2021) documented that many bioceramic formulations—including BioRoot RCS and Total Fill—exceed acceptable solubility limits. A sealer that washes out over time is fundamentally compromised:

•           Creates voids in the obturation

•           Invites bacterial microleakage

•           Results in periapical inflammation and eventual treatment failure

•           Cannot be relied upon for long-term seal stability

This property represents the most significant clinical disadvantage of many current bioceramic formulations.

Dimensional Stability: Expansion vs. Shrinkage

Epoxy Resin-Based Sealers undergo polymerization shrinkage during setting. In the confined space of the root canal, any shrinkage—even a small percentage—creates gaps that compromise the seal.

Bioceramic Sealers exhibit slight expansion during setting as they absorb moisture and form hydroxyapatite. This expansion provides a clinical advantage by:

•           Improving wall adaptation

•           Creating gap-free interfaces

•           Compensating for any voids created during obturation

•           Enhancing the overall integrity of the seal

The slight expansion of bioceramics represents a theoretical advantage over the shrinkage of resin-based sealers.

Setting Time: Predictability and Clinical Safety

Epoxy Resin-Based Sealers have a long setting time (approximately 18 hours), but this time is predictable and controllable. After approximately 18 hours, the sealer has reached its final state, and the restoration can be placed with confidence that a solid seal exists.

Bioceramic Sealers present a serious clinical concern regarding setting time. Research by Lee et al. (2017) revealed a troubling pattern:

•           Some bioceramic formulations failed to set even after one month

•           Under humid conditions (mimicking the oral environment), hydration reactions were unpredictable

•           Some samples never achieved a fully hardened state

An unsealed root canal—whether due to incomplete setting or material dissolution—is unacceptable. The entire purpose of root canal therapy is compromised if the sealer fails to provide the intended seal.

pH and Antimicrobial Properties

Epoxy Resin-Based Sealers provide minimal antimicrobial action. After setting, they are relatively neutral in pH and do not actively disinfect the canal system.

Bioceramic Sealers release calcium hydroxide during the setting reaction, creating a highly alkaline environment (pH greater than 11.5) that provides strong antimicrobial activity:

•           Active disinfection during the setting phase

•           Enhancement of periapical healing

•           Promotion of hard tissue formation

•           Additional protection against residual microorganisms

This antimicrobial property represents a distinct biological advantage of bioceramic sealers, particularly in cases where residual contamination may exist.

Clinical Considerations and Performance: From Laboratory to Practice

Moving beyond laboratory measurements to real-world application, clinical performance is influenced by biocompatibility, ease of retreatment, and patient outcomes—factors that are essential in patient-centered dental care.

Biocompatibility and Postoperative Pain

Bioceramic Sealers: Superior Biocompatibility

Bioceramic sealers are widely recognized for excellent biocompatibility and bioactivity. They are not merely well-tolerated by periapical tissues; they actively promote healing through hydroxyapatite formation. This biological benefit appears to extend to the patient experience.

In the 2025 randomized controlled trial by Sharma et al., postoperative pain incidence was:

•           Bioceramic group: 12.5%

•           Resin-based group: 25%

While this difference did not reach statistical significance (P = 0.079), it suggests a trend toward reduced pain with bioceramics. This trend likely reflects the less cytotoxic and more biocompatible nature of bioceramics, resulting in a reduced inflammatory response in periapical tissues immediately following treatment.

Epoxy Resin-Based Sealers: Adequate But Not Superior

Epoxy resin-based sealers like AH Plus are generally well-tolerated by periapical tissues, though they are not as bioactive as bioceramic materials. They do not promote healing or hard tissue formation as actively as bioceramics.

Retreatability: A Critical Trade-Off

The need for endodontic retreatment is a clinical reality. Treatment failure may occur due to:

•           Inadequate initial disinfection

•           Missed canals or anatomical variations

•           Post-treatment complications

•           Patient factors affecting healing

The choice of sealer has profound implications for retreatment success and difficulty.

A 2025 in vitro study by Abdalla et al. directly compared retreatment characteristics of both sealer types using rotary instruments:

Epoxy Resin-Based Sealers: - Significantly faster retreatment time - However, residual filling material remained in canals in 46.2% of cases - Incomplete removal left bacteria harboring sites for reinfection

Bioceramic Sealers: - Significantly slower and more time-consuming removal - Superior removal effectiveness—no residual material found in any study samples - Complete removal provides a cleaner foundation for disinfection in secondary treatment

This presents a clinical trade-off that requires careful consideration:

•           Speed advantage (epoxy resin) vs. completeness advantage (bioceramics)

•           Residual material risk (epoxy resin) vs. chairtime investment (bioceramics)

For a retreated tooth, residual sealer material can harbor bacteria and compromise the long-term prognosis of the subsequent treatment, a risk that must be weighed against the initial speed of removal.

Practical Guidance for Dental Students and Clinicians

This analysis of bioceramic and epoxy resin-based sealers provides actionable learning points to guide your clinical decision-making. Understanding these distinctions enables you to critically evaluate new materials and make evidence-based selections for your patients.

1. Respect the Gold Standard, But Understand Its Limitations

Epoxy resin-based sealers like AH Plus are the established benchmark for compelling reasons:

•           Predictable handling characteristics

•           Excellent long-term clinical data spanning decades

•           Low solubility that reliably meets ISO standards

•           Reliable, predictable setting time

•           Proven track record of long-term success

Use these materials with confidence as your baseline reference for treatment outcomes.

2. Recognize the Distinct Biological Advantages of Bioceramic Sealers

Appreciate that bioceramic sealers offer unique biological benefits:

•           Superior biocompatibility with periapical tissues

•           Bioactivity through hydroxyapatite formation

•           Chemical bonding to dentin, creating integrated seals

•           Antimicrobial properties through calcium hydroxide release

•           Trend toward reduced postoperative pain

These biological advantages make bioceramics an excellent choice for cases where promoting periapical healing is a priority.

3. Scrutinize the Critical Disadvantages of Bioceramics

Do not overlook the significant disadvantages reported for some bioceramic sealer formulations:

•           High solubility exceeding ISO standards in many products

•           Unpredictable or extremely long setting times in some formulations

•           Inconsistent clinical performance across different manufacturers

These are not minor issues—a sealer that dissolves or fails to set fundamentally compromises the entire treatment. Before selecting a bioceramic sealer, verify:

•           ISO compliance data for solubility

•           Documented setting times in clinical conditions

•           Long-term clinical performance data

4. Remember: Operator Skill Exceeds Material Properties

Synthesize findings from large-scale clinical studies (Bani-Younes et al., 2025) and systematic reviews (Rekha et al., 2023), which show comparable clinical success rates of approximately 96% for both sealer types despite laboratory differences. This finding reveals that proper technique supersedes material selection.

Critical factors within your control include:

•           Thorough mechanical cleaning and shaping

•           Verification of patency throughout treatment

•           Proper cone fit and lateral compaction techniques

•           Achievement of a high-quality obturation

•           Appropriate restoration of access opening

Your skill in these fundamental techniques will have greater impact on treatment success than the sealer brand selected.

5. Consider Retreatment Implications in Initial Treatment Planning

Recognize that sealer selection has significant consequences for potential future retreatment:

•           Resin-based sealers are faster to remove but may leave residual material (46.2% of cases)

•           Bioceramic sealers require more chairtime but can be removed completely

Plan treatment with potential retreatment in mind, especially for:

•           Cases with questionable initial anatomy

•           Patients with compromised healing capacity

•           Teeth with complex canal systems

6. Develop Critical Evidence Evaluation Skills

Always consider the source and type of evidence you review:

•           In vitro studies reveal specific material properties and peak performance potential

•           RCTs and systematic reviews provide broader perspectives on real-world clinical effectiveness

•           Case series and retrospective studies document actual clinical outcomes in diverse populations

Understanding why results differ between evidence types—rather than dismissing apparent contradictions—is a skill that will prove invaluable as new materials and technologies emerge throughout your career.

Frequently Asked Questions

Q1: Which sealer should I use for my first root canal treatment?

A: AH Plus or similar epoxy resin-based sealers are recommended for initial clinical experience. These sealers offer:

•           Predictable handling and working time

•           Reliable setting characteristics

•           Extensive clinical data demonstrating long-term success

•           ISO-compliant solubility standards

•           Familiarity among experienced clinicians

Once you master fundamental obturation technique, you can confidently explore bioceramic sealers for specific cases where their biological advantages align with your treatment goals.

Q2: Are bioceramic sealers truly superior to AH Plus?

A: The answer is nuanced and depends on your definition of “superior.” Bioceramic sealers demonstrate:

•           Laboratory advantages: Superior sealing in controlled studies

•           Biological advantages: Better biocompatibility and bioactivity

•           Comparable clinical success: 96% success rates for both types

However, some bioceramic formulations have solubility and setting time concerns. Within-type variation is significant—not all bioceramics perform identically. Rather than assuming superiority, evaluate specific products and formulations based on published data.

Q3: What is the risk if a sealer dissolves over time?

A: Sealer dissolution creates several serious risks:

•           Void formation: Loss of material creates empty spaces within the obturation

•           Microleakage: Bacteria from the oral environment infiltrate through voids

•           Reinfection: Previously eliminated bacteria reestablish in the canal system

•           Periapical inflammation: Delayed inflammation and potential abscess formation

•           Treatment failure: The tooth may eventually require retreatment or extraction

Solubility is a non-negotiable sealer property. Always verify that your selected sealer meets ISO solubility standards.

Q4: How long does it take for different sealers to fully set?

A: Setting times vary significantly:

•           AH Plus (epoxy resin): Approximately 18 hours to complete polymerization

•           Bioceramic sealers: Highly variable; can range from days to months depending on humidity and formulation

•           Some bioceramic formulations: May fail to set completely even after extended periods

Before selecting a sealer, verify documented setting times under clinical conditions (humid environment at body temperature), not ideal laboratory conditions.

Q5: If I need to retreat a tooth, will the sealer type matter?

A: Significantly, yes. Research shows:

•           Epoxy resin sealers are faster to remove but may leave residual material (46.2% of cases)

•           Bioceramic sealers require more removal time but are eliminated completely

Residual sealer material can harbor bacteria and compromise retreatment success. If you anticipate potential retreatment, bioceramic sealers may provide better long-term outcomes despite requiring more removal time.

Q6: Do bioceramic sealers really reduce postoperative pain?

A: Clinical data suggest a possible trend toward reduced pain with bioceramic sealers (12.5% vs. 25% incidence in the Sharma et al. study), but the difference was not statistically significant. The trend likely reflects improved biocompatibility and reduced inflammatory response. However, proper case selection and technique remain more important than sealer type for managing postoperative pain.

Q7: How do I know if a bioceramic sealer formulation is clinically reliable?

A: Before selecting a bioceramic sealer, verify:

1.         ISO 6876 compliance for solubility (less than 3% weight loss)

2.         Published setting time data under clinical humidity conditions

3.         Long-term clinical outcome studies demonstrating success rates

4.         Retreatability data from peer-reviewed research

5.         Real-world clinical feedback from experienced practitioners

Do not assume all bioceramic sealers have equivalent properties. Significant variation exists between brands and formulations. Make selections based on published evidence rather than marketing claims.