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Related Experiment Videos

A methacrylate-based cement used as a root canal sealer

K M Ahlberg1, W M Tay

  • 1Department of Conservative Dentistry, St Bartholomew's, London, UK.

International Endodontic Journal
|November 21, 1998
PubMed
Summary

A modified methacrylate-based bone cement using tetrahydrofurfuryl methacrylate shows promise as a root canal sealer. Reduced particle size significantly improved sealing ability, with excellent bonding and handling properties observed.

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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.

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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.