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[An evaluation of completely ceramic crowns]
P De Nys1, P A Adriaens, J M De Boever
1Dienst voor Kroon- en Brugwerk en Parodontologie, rijksuniversiteit te Gent, België.
Nederlands Tijdschrift Voor Tandheelkunde
|February 1, 1994
Summary
This study evaluated Cerestore all-ceramic crowns, finding significant marginal discrepancies and occasional fractures during try-on. While acceptable for premolars and molars, improvements in esthetics and fit are needed.
Area of Science:
- Restorative Dentistry
- Dental Materials Science
Background:
- All-ceramic crowns offer aesthetic advantages but require precise marginal fit for longevity.
- Cerestore, an all-ceramic crown system, was evaluated for its clinical performance.
Purpose of the Study:
- To assess the marginal discrepancy and clinical performance of Cerestore all-ceramic crowns.
- To compare two finishing line preparations (straight shoulder vs. hollow chamber) for Cerestore crowns.
Main Methods:
- Fabrication of Cerestore crowns on premolars and molars with two finishing line designs.
- In vivo marginal zone replica analysis using scanning electron microscopy.
- Evaluation of crown fracture, cementation stability, gingival health, and esthetics over a six-month period.
Main Results:
- High variability in marginal discrepancy (12.2–232.7 µm) was observed, increasing slightly post-cementation.
- Several crowns fractured during try-on; no fractures occurred after cementation within six months.
- Gingival health remained stable, but esthetic outcomes were sometimes compromised by the visible core material.
Conclusions:
- Cerestore all-ceramic crowns demonstrate acceptable clinical performance as solitary restorations in the posterior region.
- Significant improvements in marginal fit and esthetics are recommended for the Cerestore system.