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Quintessence International
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Quintessence Int 23 (1992), No. 12     1. Dec. 1992
Quintessence Int 23 (1992), No. 12  (01.12.1992)

Page 845-847


Resistance to fracture of ceramic jacket crowns
Passi / Girardello / Vesentini
The resistance to fracture of jacket crowns, fabricated of cast glass-ceramic and five traditional ceramics, was evaluated. Four identical jacket crowns of each type were constructed on absolutely equal dental abutments in epoxy resin, obtained from a primary mandibular molar. An increasing load was then applied to the mesiobuccal cusp of each of the 24 crowns. Although the glass-ceramic proved to have the highest fracture resistance, it was not significantly stronger than three other traditional ceramics; neither did it seem to be suitable for constructing jacket crowns on posterior teeth.