Preliminary In Vitro Study on O-Ring Wear in Mini-Implant-Retained Overdentures

Author(s)

Lima Chaves, Carolina de Andrade ; de Souza, Raphael Freitas ; Cunha, Tatiana Ramirez ; Della Vecchia, Maria Paula ; Ribeiro, Adriana Barbosa ; Bruniera, Joao Felipe ; Silva-Sousa, Yara Teresinha

• Document type: Journal article
• Source: International Journal of Prosthodontics; v. 29, n. 4, p. 357-359, JUL-AUG 2016.
• Web of Science Citations: 1

Abstract

This preliminary in vitro study evaluated the simulated retention force of O-rings used for mini-implant overdenture treatment and the effect of mechanical fatigue corresponding to 6 months of wear. A mandibular overdenture analog device was attached to two mini-implants and underwent a tensile strength test before and after the application of insertion-removal and simulated masticatory cycles. Insertion-removal cycles led to a retention loss of 24%, whereas masticatory cycles did not influence retention. Micro-CT scans showed minor deformation following mechanical cycling, but the changes were milder than those observed in similar clinical specimens. Both experimental loading methods led to physical changes in the O-rings, which explains in part the similar clinically observed wear. (AU)

• FAPESP's process: 11/00688-7 - Mandibular overdentures retained by conventional or mini implants: a randomized clinical trial
• Grantee: Raphael Freitas de Souza
• Support Opportunities: Regular Research Grants