title: Effect of implant diameter on reliability and failure modes of molar crowns.
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.
authors.affiliation: Department of Biomaterial and Biomimetics, New York University College of Dentistry, New York, New York, USA. ac.freitas.jr@gmail.com
authors.forename: Amilcar C
authors.initials: AC
authors.lastname: Freitas-Junior
authors.forename: Estevam A
authors.initials: EA
authors.lastname: Bonfante
authors.forename: Leandro M
authors.initials: LM
authors.lastname: Martins
authors.forename: Nelson R F A
authors.initials: NR
authors.lastname: Silva
authors.forename: Leonard
authors.initials: L
authors.lastname: Marotta
authors.forename: Paulo G
authors.initials: PG
authors.lastname: Coelho
mesh_terms: D003442:Crowns; D059605:Dental Implant-Abutment Design; D015921:Dental Implants; D019094:Dental Prosthesis, Implant-Supported; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D008963:Molar; D016019:Survival Analysis
chemical_list: D015921:Dental Implants