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Marginal discrepancy of ceramic crowns with redesigned implant components
J K Sutherland1, R W Loney, T J Jarotskic
1Division of Fixed Prosthodontics, College of Dentistry, University of Saskatchewan, Saskatoon, Canada.
The Journal of Prosthetic Dentistry
|May 1, 1996
Summary
The redesigned CeraOne ceramic system shows significantly reduced marginal discrepancy in cemented crowns, improving fit by over 100 microns compared to the original design.
Area of Science:
- Biomaterials and Dental Prosthetics
- Materials Science in Dentistry
Background:
- Previous CeraOne ceramic crowns exhibited a mean marginal discrepancy of 169 microns.
- Component redesign by the manufacturer necessitated re-evaluation of marginal fit.
Purpose of the Study:
- To assess the marginal discrepancy of the newly redesigned CeraOne ceramic components.
- To compare the marginal fit of various CeraOne components, including cemented crowns.
Main Methods:
- Utilized a video camera and stereomicroscope connected to a computer for precise measurement.
- Examined fifteen samples each of ceramic caps (control), fired caps, ceramic crowns, and cemented ceramic crowns.
- Analyzed data using ANOVA and Scheffe F-test for statistical significance.
Main Results:
- Mean marginal discrepancies: caps (20.4 µm), fired caps (18.3 µm), crowns (28.1 µm), and cemented crowns (65.9 µm).
- Significant differences (p < 0.0001) were found between all groups.
- Cemented crowns showed significantly greater discrepancies than uncemented retainers (p < 0.0001).
Conclusions:
- The redesigned CeraOne system demonstrates a substantial improvement in marginal fit for cemented crowns.
- The mean marginal discrepancy for cemented crowns was reduced by over 100 microns compared to the original design.
- The study confirms the enhanced marginal integrity of the updated CeraOne ceramic system.