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Effect of porcelain crown substructures on visually perceivable value
B J Crispin1, S K Okamoto, H Globe
1Center for Esthetic Dentistry, University of California, School of Dentistry, Los Angeles.
The Journal of Prosthetic Dentistry
|August 1, 1991
Summary
Substructures significantly impact ceramic crown color. Rexillium III alloys and tin-plated platinum foil substructures in dental crowns were found to reduce the perceived Value (brightness).
Area of Science:
- Dental Materials Science
- Aesthetic Dentistry
- Biomaterials
Background:
- Controlling the color of ceramic restorations is crucial for predictable aesthetic outcomes.
- Clinical observations suggest that certain substructures may negatively influence the Value (brightness) of porcelain crowns.
Purpose of the Study:
- To investigate whether different substructures in ceramic restorations lead to visually detectable differences in Value.
- To compare the impact of specific metal alloys and internal foil plating on the perceived brightness of dental crowns.
Main Methods:
- Two groups of ceramic crowns were evaluated: metal-ceramic crowns (Galaxy vs. Rexillium III alloys) and aluminous porcelain jacket crowns (with vs. without tin-plated platinum foil).
- Visual analysis was employed to assess perceived differences in Value among the tested crown types.
Main Results:
- Metal-ceramic crowns with Rexillium III substructures were more frequently perceived as having a significantly lower Value.
- Aluminous porcelain jacket crowns with tin-plated, bonded platinum foil substructures also showed a higher incidence of significantly lower Value.
Conclusions:
- The choice of substructure material significantly influences the final Value of ceramic dental restorations.
- Rexillium III alloys and tin-plated platinum foil should be considered carefully when aiming for optimal Value in metal-ceramic and aluminous porcelain jacket crowns, respectively.