Related Experiment Videos
Marginal adaptation of castable ceramic crowns
J D Weaver1, G H Johnson, D J Bales
1Department of Restorative Dentistry, University of Washington, School of Dentistry, Seattle.
The Journal of Prosthetic Dentistry
|December 1, 1991
Summary
Ceramic crown marginal adaptation was evaluated. Cerestore crowns showed the best marginal adaptation, unaffected by preparation type or increased seating force in this study.
Area of Science:
- Dental materials science
- Prosthodontics
Background:
- Tooth preparation and seating techniques vary between castable ceramic and metal-ceramic crowns.
- Understanding cementation effects on marginal adaptation is crucial for crown longevity.
Purpose of the Study:
- To evaluate the impact of cementation variables on the marginal adaptation of Dicor, Cerestore, and porcelain-fused-to-metal (PFM) crowns.
- To compare the marginal fit of different crown types under varying preparation and seating force conditions.
Main Methods:
- Three crown types (Dicor, Cerestore, PFM) were fabricated with a replication size of 10.
- Master dies were used, with shoulder preparation for ceramic and cavosurface bevel for PFM crowns.
- Marginal openings were measured using a Nikon Measurescope 20 after cementation with zinc phosphate cement and standard clinical force.
Main Results:
- Marginal adaptation was not significantly improved by using a gingival bevel preparation.
- Increased seating force did not enhance the marginal adaptation of the tested crowns.
- Cerestore crowns exhibited the superior marginal adaptation compared to Dicor and PFM crowns.
Conclusions:
- Preparation design (shoulder vs. bevel) and seating force do not consistently improve marginal adaptation for these crown types.
- Cerestore ceramic crowns demonstrate the best marginal fit among the evaluated materials and techniques.