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The International Journal of Prosthodontics



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Int J Prosthodont 29 (2016), No. 4     1. July 2016
Int J Prosthodont 29 (2016), No. 4  (01.07.2016)

Page 357-359, doi:10.11607/ijp.4677, PubMed:27479342

Preliminary In Vitro Study on O-Ring Wear in Mini-Implant-Retained Overdentures
Chaves, Carolina de Andrade Lima / de Souza, Raphael Freitas / Cunha, Tatiana Ramirez / Vecchia, Maria Paula Della / Ribeiro, Adriana Barbosa / Bruniera, João Felipe / Silva-Sousa, Yara Teresinha
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.