Abstract
Clinically, zirconia-supported all-ceramic restorations are failing by veneer-chipping without exposing the zirconia interface. We hypothesized that mouth motion step-stress-accelerated fatigue testing of standardized dental crowns would permit this previously unrecognized failure mode to be investigated. Using CAD software, we imported the average dimensions of a mandibular first molar crown and modeled tooth preparation. The CAD-based tooth preparation was rapid-prototyped as a die for fabrication of zirconia core porcelain-veneered crowns. Crowns were bonded to aged composite reproductions of the preparation and aged 14 days in water. Crowns were single-cycleloaded to failure or mouth-motion step-stress-fatigue-tested. Finite element analysis indicated high stress levels below the load and at margins, in agreement with only single-cycle fracture origins. As hypothesized, the mouth motion sliding contact fatigue resulted in veneer chipping, reproducing clinical findings allowing for investigations into the underlying causes of such failures.
Original language | English (US) |
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Pages (from-to) | 382-386 |
Number of pages | 5 |
Journal | Journal of dental research |
Volume | 88 |
Issue number | 4 |
DOIs | |
State | Published - 2009 |
Keywords
- All-ceramic
- Finite element analysis
- Mechanical testing
- Single-crown
- Step-stress fatigue
ASJC Scopus subject areas
- General Dentistry