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Effect of implant diameter on reliability and failure modes of molar crowns
Amilcar C Freitas-Junior1, Estevam A Bonfante, Leandro M Martins
1Department of Biomaterial and Biomimetics, New York University College of Dentistry, New York, New York, USA. ac.freitas.jr@gmail.com
Abstract:
The reliability and failure modes of molar crowns supported by three different implant-supported designs were tested according to the following groups: group 1, one standard-diameter implant (3.75 mm); group 2, one narrow-diameter implant (3 mm); and group 3, two narrow-diameter implants (3 mm). Loads were applied as mouth-motion cycles using a step-stress accelerated life-testing method. ? values for groups 1 and 3 (1.57 and 2.48, respectively) indicated that fatigue accelerated the failure of both groups, but not for group 2 (0.39). Abutment screw failure was the chief failure mode. Strength and reliability were significantly higher for groups 1 and 3 compared to group 2.