Probability of fracture of all-ceramic crowns.
OBJECTIVE
The study compared the probability of fracture of 4 systems of all-ceramic crowns fabricated on maxillary central incisors.


METHODS
The 4 all-ceramic crown systems were: (1) a glass-infiltrated, sintered alumina system (In-Ceram) fabricated conventionally, (2) the same system with machine-milled alumina cores (CEREC 2), (3) a heat-press, leucite-reinforced glass-ceramic system (IPS Empress), and (4) a high-purity, high-density alumina system (Procera). Ten crowns of each system were fabricated and compressed at 45 degrees at the palatal surface until failure. The data were analyzed with the Weibull method.


RESULTS
There were no significant differences in the probability of fracture among the 4 systems studied.


CONCLUSIONS
The likelihood of fracture of these crown systems on central incisors should be similar.
Chai
J
J
Northwestern University Dental School, 240 East Huron Street, Chicago, Illinois 60611, USA. jchai@nwu.edu
Takahashi
Y
Y
Sulaiman
F
F
Chong
K
K
Lautenschlager
E P
EP
D000537:Aluminum Oxide; D000538:Aluminum Silicates; D002516:Ceramics; D003442:Crowns / Q000706:statistics & numerical data*; D003776:Dental Porcelain / Q000737:chemistry; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D007180:Incisor; D008422:Materials Testing; D008437:Maxilla; D016876:Metal Ceramic Alloys; D009010:Monte Carlo Method; D012044:Regression Analysis; D016019:Survival Analysis; D014025:Titanium
D000538:Aluminum Silicates; C075815:IPS-Empress ceramic; D016876:Metal Ceramic Alloys; C077451:Procera; D003776:Dental Porcelain; C074543:Cerec; C070870:In-Ceram; D014025:Titanium; D000537:Aluminum Oxide