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Marginal accuracy of provisional restorative materials
1University of California, School of Dentistry, San Francisco.
The Journal of Prosthetic Dentistry
|June 1, 1990
Summary
Three resins—Duralay, Cold Pac, and Snap—showed superior marginal adaptation in provisional restorations. Water absorption may offset polymerization shrinkage, improving resin accuracy for dental applications.
Area of Science:
- Dental Materials Science
- Prosthodontics
Background:
- Marginal integrity is crucial for provisional restorations, but previous research shows conflicting results.
- The development of new resins complicates the selection of accurate materials for provisional restorations.
Purpose of the Study:
- To evaluate the marginal accuracy of seven commercial resins using an indirect technique.
- To assess the impact of water absorption on polymerization shrinkage in provisional restorative resins.
Main Methods:
- Seven commercially available resins were tested.
- Eight specimens per material were evaluated under three conditions: immediately post-polymerization, after one week of dry storage, and after one week of water storage.
Main Results:
- Duralay, Cold Pac, and Snap resins demonstrated statistically significant superior marginal adaptation.
- Water absorption appeared to counteract ongoing polymerization shrinkage.
Conclusions:
- Duralay, Cold Pac, and Snap resins are recommended for superior marginal adaptation in provisional restorations.
- Water absorption plays a role in mitigating polymerization shrinkage, enhancing the dimensional stability of provisional resins.