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Improved retention of acid-etched fixed partial dentures: a longitudinal study
J F Simon1, R G Gartrell, A Grogono
1Department of Operative Dentistry, University of the Pacific School of Dentistry, San Francisco, Calif.
The Journal of Prosthetic Dentistry
|October 1, 1992
Summary
Improving fixed partial denture longevity, this study found that adding retentive grooves to tooth preparations significantly increased retention rates. This modification enhances the mechanical lock for resin-bonded restorations, boosting clinical success.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Restorative Dentistry
Background:
- Debonding of acid-etched fixed partial dentures presents a persistent clinical challenge.
- Current methods often lack sufficient long-term retention, impacting restoration longevity.
Purpose of the Study:
- To evaluate the efficacy of modifying mechanical retention in tooth preparations to resolve debonding issues.
- To assess the impact of retentive grooves on the 4-year retention of posterior resin-bonded fixed partial dentures.
Main Methods:
- Retentive grooves were prepared at the line angles of tooth preparations.
- These grooves served as mechanical locks for resin-bonded fixed partial dentures.
- Clinical retention was monitored over a 10 to 52-month period in a dental school clinic.
Main Results:
- The placement of proximal retentive grooves improved the 4-year retention rate from 60% to 95%.
- Design modifications were demonstrated to be essential for enhancing clinical longevity.
- Restorations with these modifications approach traditional definitions of 'permanent' restorations.
Conclusions:
- Modifying tooth preparations with retentive grooves significantly enhances the retention of resin-bonded fixed partial dentures.
- These design modifications are crucial for achieving long-term clinical success and improving restoration longevity.
- The findings offer greater confidence for dentists, particularly less experienced practitioners, regarding treatment outcomes.