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Resin-dentin interfaces of endodontically-treated restored teeth.
Francesco Mannocci1, Egidio Bertelli, Timothy F Watson
1Department of Restorative Dentistry, University of Siena, Italy. mannocci@sirius.pisa.it
American Journal of Dentistry
|May 15, 2003
Summary
This study examined the interface between resin restorations and dentin in endodontically treated teeth. Debonding of the adhesive and composite cement were common, increasing with longer clinical service.
Area of Science:
- Dental Materials Science
- Restorative Dentistry
- Endodontics
Background:
- Restoration of endodontically treated teeth often involves post placement and composite resin restoration.
- Understanding the integrity of the post-resin-dentin interface is crucial for long-term clinical success.
Purpose of the Study:
- To compare the post-resin-dentin interfaces of endodontically treated teeth restored with dentin-bonding systems and composite using confocal and scanning electron microscopy.
- To evaluate the effect of clinical service duration (6 months to 6 years) on interface integrity.
Main Methods:
- Sixteen single-rooted teeth with proximal lesions were endodontically treated.
- Teeth were restored with carbon fiber posts and resin-based composite, with some also receiving porcelain-fused-to-metal crowns.
- Confocal and scanning electron microscopy were used to analyze the post-resin-dentin interfaces.
Main Results:
- Resin penetration into root dentin was observed in two-thirds of the coronal and middle thirds of the post space, but only one-third in the apical third.
- Debonding of the adhesive from resin-infiltrated dentin and debonding of composite cement from the adhesive were frequent failure modes.
- Longer clinical service correlated with increased debonding at the adhesive-dentin interdiffusion zone. Crown coverage did not significantly affect interface integrity.
Conclusions:
- The post-resin-dentin interface exhibits frequent debonding, particularly with longer clinical service.
- Resin infiltration is more prevalent coronally than apically.
- Further research is needed to improve the longevity and stability of these interfaces.