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Marginal reservoirs for multiunit castings
1Department of Prosthodontics, University of Hacettepe, Faculty of Dentistry, Ankara, Turkey.
Quintessence International (Berlin, Germany : 1985)
|April 1, 1995
Summary
Adding "marginal reservoirs" to wax patterns significantly reduced distortion in four-unit fixed partial dentures made from base metal alloys. This technique improves the accuracy of dental prostheses.
Area of Science:
- Dental Materials Science
- Prosthodontics
- Biomaterials Engineering
Background:
- Fixed partial dentures (FPDs) are common dental restorations.
- Distortion during casting can compromise the fit and longevity of FPDs.
- Base metal alloys are frequently used for their strength and biocompatibility.
Purpose of the Study:
- To evaluate the impact of
Main Methods:
- Standardized wax patterns for four-unit FPDs were fabricated using a three-piece stainless steel mold.
- Twenty anterior prostheses were cast using a nickel-chromium alloy.
- Marginal discrepancies were measured using a traveling microscope on specimens with and without marginal reservoirs.
Main Results:
- Castings incorporating marginal reservoirs exhibited significantly less distortion compared to the control group.
- The positioning of marginal reservoirs on wax patterns demonstrably reduced marginal discrepancies.
- This indicates improved dimensional stability of the final prostheses.
Conclusions:
- The use of marginal reservoirs in wax patterns is an effective method to minimize distortion during the casting of base metal four-unit fixed partial dentures.
- This technique enhances the marginal accuracy and potentially the clinical success of dental prostheses.
- Further research could explore variations in reservoir design and alloy types.