Influence of platform diameter in the reliability and failure mode of extra short dental implants

Author(s)

Bordin, Dimorvan ^{[1, 2, 3]} ; Bergamo, Edmara T. P. ^{[1, 3]} ; Bonfante, Estevam A. ^[4] ; Fardin, Vinicius P. ^[4] ; Coelho, Paulo G. ^{[3, 5]}

Affiliation

^[1] Univ Estadual Campinas, Piracicaba Dent Sch, Piracicaba, SP - Brazil

^[2] Univ Guarulhos, Guarulhos, SP - Brazil

^[3] NYU, Coll Dent, Dept Biomat & Biomimet, 433, 1st Ave, Room 844, New York, NY - USA

^[4] Univ Vila Velha, Dept Prosthodont, Vila Velha, ES - Brazil

^[5] NYU, Sch Med, Hansjorg Wyss Dept Plast Surg, 307 East 33rd St, New York, NY 10016 - USA

• Document type: Journal article
• Source: JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS; v. 77, p. 470-474, JAN 2018.
• Web of Science Citations: 2

Abstract

Purpose: To evaluate the influence of implant diameter in the reliability and failure mode of extra-short dental implants. Materials and methods: Sixty-three extra-short implants (5 mm-length) were allocated into three groups according to platform diameter: 04.0-mm, 05.0-mm, and 06.0-mm (21 per group). Identical abutments were torqued to the implants and standardized crowns cemented. Three samples of each group were subjected to single-load to failure (SLF) to allow the design of the step-stress profiles, and the remaining 18 were subjected to step-stress accelerated life-testing (SSALT) in water. The use level probability Weibull curves, and the reliability (probability of survival) for a mission of 100,000 cycles at 100 MPa, 200 MPa, and 300 MPa were calculated. Failed samples were characterized in scanning electron microscopy for fractographic inspection. Results: No significant difference was observed for reliability regarding implant diameter for all loading missions. At 100 MPa load, all groups showed reliability higher than 99%. A significant decreased reliability was observed for all groups when 200 and 300 MPa missions were simulated, regardless of implant diameter. At 300 MPa load, the reliability was 0%, 0%, and 5.24%, for phi 4.0 mm, 05.0 mm, and phi 6.0 mm, respectively. The mean beta (beta) values were lower than 0.55 indicating that failures were most likely influenced by materials strength, rather than damage accumulation. The phi 6.0 mm implant showed significantly higher characteristic stress (eta = 1,100.91 MPa) than phi 4.0 nun (13030.25 MPa) and 05.0 mm implant (eta = 1,012.97 MPa). Weibull modulus for phi 6.0-mm implant was m = 7.41, m = 14.65 for 04.0 mm, and m = 11.64 for phi 5.0 nun. The chief failure mode was abutment fracture in all groups. Conclusions: The implant diameter did not influence the reliability and failure mode of 5 mm extra-short implants. (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