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Quintessence Publishing: Journals: IJP
The International Journal of Prosthodontics

Edited by George A. Zarb, BChD, DDS, MS, MS, FRCD(C)

ISSN 0893-2174

November/December 1996
Volume 9 , Issue 6

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Fracture Resistance of Human Enamel and Three All-Ceramic Crown Systems on Extracted Teeth

Scherrer/De Rijk/Belser

Pages: 580-585
PMID: 9171497

This in vitro study measured the fracture resistance of intact extracted molars and three types of all-ceramic crowns: feldspathic porcelain, glass-ceramic, and glass-infilt rated alumina. All crowns were of a simplified three-cusp occlusal configuration, and were placed on prepared, extracted third molars. The ceramic crowns were bonded to dentin with a resin composite cement, except for 10 of the feldspathic crowns, which were luted with zinc phosphate cement. The fracture resistance was measured using a spherical steel indenter that contacted the occlusal surface at three points. A total of 40 ceramic crowns and 50 extracted maxillary third molars were tested. The Weibull distribution was used for data analysis. Intact extracted teeth were significan tly stronger than all-ceramic crowns. Of the ceramic restorations, the glass-infiltrated alumina crowns exhibited the highest fracture resistance.

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