Effect of implant diameter on reliability and failure modes of molar crowns

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). Loa...

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Bibliographic Details
Published in:	The International journal of prosthodontics Vol. 24; no. 6; p. 557
Main Authors:	Freitas-Junior, Amilcar C, Bonfante, Estevam A, Martins, Leandro M, Silva, Nelson R F A, Marotta, Leonard, Coelho, Paulo G
Format:	Journal Article
Language:	English
Published:	United States 01-11-2011
Subjects:	Crowns Dental Implant-Abutment Design Dental Implants Dental Prosthesis, Implant-Supported Dental Restoration Failure Dental Stress Analysis Molar Survival Analysis
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Summary:	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.
ISSN:	0893-2174