Resistance to fracture of metal ceramic and all-ceramic crowns.
This study evaluated the fracture resistance of three types of all-ceramic crowns and compared these to the fracture values of metal ceramics. Uniform metal ceramic specimens; veneered, cast glass-ceramic; and porcelain fused to two different dispersion-strengthened ceramic cores (Hi-Ceram and In-Ceram) were investigated. The metal ceramic specimens demonstrated a significantly higher resistance to fracture than did the Hi-Ceram or veneered glass-ceramic units but did not significantly differ from the In-Ceram specimens. The metal ceramic crowns showed cracks only in the ceramic layer, whereas the all-ceramic specimens underwent global fracture.
Castellani
D
D
Department of Prosthodontics, School of Dental Medicine, University of Florence, Italy.
Baccetti
T
T
Giovannoni
A
A
Bernardini
U D
UD
D000537:Aluminum Oxide; D000704:Analysis of Variance; D002516:Ceramics; D003442:Crowns; D003776:Dental Porcelain; D004548:Elasticity; D006801:Humans; D008422:Materials Testing; D016876:Metal Ceramic Alloys; D013314:Stress, Mechanical
C047475:Dicor ceramic; C062269:Hi Ceram; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain; C070870:In-Ceram; D000537:Aluminum Oxide