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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fracture strength and probability of survival of narrow and extra-narrow dental implants after fatigue testing: In vitro and in silico analysis

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Author(s):
Bordin, Dimorvan ; Bergamo, Edmara T. P. ; Fardin, Vinicius P. ; Coelho, Paulo G. ; Bonfante, Estevam A.
Total Authors: 5
Document type: Journal article
Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 71, p. 244-249, JUL 2017.
Web of Science Citations: 6
Abstract

Purpose: To assess the probability of survival (reliability) and failure modes of narrow implants with different diameters. Materials and methods: For fatigue testing, 42 implants with the same macrogeometry and internal conical connection were divided, according to diameter, as follows: narrow ((empty set)3.3x10 mm) and extra-narrow ((empty set)2.9x10 mm) (21 per group). Identical abutments were torqued to the implants and standardized maxillary incisor crowns were cemented and subjected to step-stress accelerated life testing (SSALT) in water. The use level probability Weibull curves, and reliability for a mission of 50,000 and 100,000 cycles at 50 N, 100, 150 and 180 N were calculated. For the finite element analysis (FEA), two virtual models, simulating the samples tested in fatigue, were constructed. Loading at 50 N and 100 N were applied 30 degrees off-axis at the crown. The von-Mises stress was calculated for implant and abutment. Results: The beta (beta) values were: 0.67 for narrow and 1.32 for extra-narrow implants, indicating that failure rates did not increase with fatigue in the former, but more likely were associated with damage accumulation and wear-out failures in the latter. Both groups showed high reliability (up to 97.5%) at 50 and 100 N. A decreased reliability was observed for both groups at 150 and 180 N (ranging from 0 to 82.3%), but no significant difference was observed between groups. Failure predominantly involved abutment fracture for both groups. FEA at 50 N-load, (empty set)3.3 mm showed higher von-Mises stress for abutment (7.75%) and implant (2%) when compared to the (empty set)2.9 mm. Conclusions: There was no significant difference between narrow and extra-narrow implants regarding probability of survival. The failure mode was similar for both groups, restricted to abutment fracture. (AU)

FAPESP's process: 12/19078-7 - Development and processing of Al2O3-ZrO2 translucent composite for CAD/CAM monolithic prostheses: the effect of aging on biaxial flexural strength
Grantee:Estevam Augusto Bonfante
Support Opportunities: Research Grants - Young Investigators Grants