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  • Title: Fracture resistance of human enamel and three all-ceramic crown systems on extracted teeth.
    Author: Scherrer SS, De Rijk WG, Belser UC.
    Journal: Int J Prosthodont; 1996; 9(6):580-5. PubMed ID: 9171497.
    Abstract:
    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-infiltrated 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 resistances 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 significantly stronger than all-ceramic crowns. Of the ceramic restorations, the glass-infiltrated alumina crowns exhibited the highest fracture resistance.
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