A methacrylate-based cement used as a root canal sealer

Area of Science:

• Dental Materials Science
• Endodontics
• Polymer Chemistry

Background:

• Orthopaedic bone cements, typically methacrylate-based, require modification for endodontic applications.
• Developing novel root canal sealers with enhanced sealing and bonding capabilities is crucial for endodontic treatment success.

Purpose of the Study:

• To evaluate a modified methacrylate-based resin as a root canal sealer.
• To assess the sealing, bonding, solubility, and handling properties of the new resin formulation.

Main Methods:

• Methacrylate-based bone cement monomer was substituted with tetrahydrofurfuryl methacrylate.
• Seventy-three human teeth were used, divided into two experimental groups (n=30 each) based on polymer particle size (≤75 µm vs. ≤45 µm) and a control group.
• Leakage was assessed using silver nitrate, and scanning electron microscopy (SEM) evaluated bonding. Solubility was tested via weight change in saline.

Main Results:

• The group with smaller particle size (≤45 µm) exhibited significantly less linear leakage (0.57 mm ± 0.65) compared to the larger particle size group (1.10 mm ± 1.04).
• Twelve roots in the smaller particle size group showed no leakage, versus four in the larger particle size group.
• SEM confirmed good bonding between the resin, dentin, and gutta-percha. No significant weight change indicated good solubility, and working time was approximately 50 minutes with easy handling.

Conclusions:

• The modified methacrylate-based resin, particularly with smaller particle sizes, demonstrates superior sealing ability for root canal obturation.
• The material exhibits favorable bonding, solubility, and handling characteristics, suggesting its potential as an effective root canal sealer.