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A core fracture with all-ceramic crowns: a case report
Leslie C T Chew1, Chris C Wyatt, Nigel M King
1Department of Oral Health Sciences, University of British Columbia, Vancouver, Canada.
General Dentistry
|July 2, 2010
Summary
A case study details a rare veneer-to-core fracture in an all-ceramic Procera crown. This highlights potential failure points in high-strength dental ceramics, concerning dentists.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
Background:
- All-ceramic crowns offer aesthetic advantages over traditional metal-ceramic restorations.
- High-strength alumina cores, like Procera AllCeram, are designed for enhanced fracture resistance.
- Despite material advancements, ceramic fractures remain a clinical concern.
Purpose of the Study:
- To report an unusual case of veneer-to-core fracture in a Procera AllCeram crown.
- To discuss potential etiological factors contributing to ceramic core fractures.
- To inform general dentists about risks associated with all-ceramic restorations.
Main Methods:
- Observational-descriptive case study.
- Review of recent literature on ceramic fracture mechanisms.
- Analysis of clinical factors potentially contributing to the observed fracture.
Main Results:
- An unusual veneer-to-core fracture occurred in a Procera AllCeram crown after 18 months.
- The fracture highlights a discrepancy between expected and observed fracture resistance.
- Identified contributing factors include bruxism, manufacturing defects, occlusal adjustments, and cementation.
Conclusions:
- Veneer-to-core fractures in Procera AllCeram crowns, though rare, pose a significant clinical challenge.
- Multiple factors, including patient-related (bruxism) and technical (manufacturing, adjustment, cement), can compromise ceramic restorations.
- Further research and clinical vigilance are necessary to minimize fracture incidence in all-ceramic dental restorations.
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