Bonding of resin-based sealers to root dentin

Area of Science:

• Dental Materials Science
• Biomaterials Engineering
• Endodontics

Background:

• Root canal sealers are crucial for the success of endodontic treatment.
• Understanding the bond strength of various sealer types to dentin is essential for clinical efficacy.
• Sealer film thickness may influence its interaction with root canal walls.

Purpose of the Study:

• To compare the microshear bond strength of three resin-based root canal sealers to root dentin.
• To evaluate the effect of thin versus thick film application on sealer bond strength.
• To analyze failure modes associated with different sealer types and film thicknesses.

Main Methods:

• Microshear bond strength testing was performed on 45 root halves from maxillary premolars.
• Three resin-based sealers (two epoxy resin-based, one urethane dimethacrylate-based) were tested in thin and thick film configurations.
• Failure modes were analyzed using light and scanning electron microscopy.
• Data were statistically analyzed using analysis of variance (ANOVA).

Main Results:

• Epoxy resin-based sealers demonstrated significantly higher microshear bond strength to root dentin than urethane dimethacrylate-based sealers (p < 0.001).
• Thicker sealer films exhibited significantly greater bond strength compared to thin films (p < 0.001).
• Distinct failure patterns were observed between thin and thick sealer applications.

Conclusions:

• Epoxy resin-based sealers offer superior adhesion to root dentin compared to urethane dimethacrylate-based sealers.
• Sealer film thickness significantly impacts bond strength, with thicker layers performing better.
• Clinical application of sealers should consider film thickness for optimal bond performance.