title: Preliminary In Vitro Study on O-Ring Wear in Mini-Implant-Retained Overdentures.
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.
authors.forename: Carolina Andrade
authors.initials: CA
authors.lastname: Chaves
authors.forename: Raphael Freitas
authors.initials: RF
authors.lastname: Souza
authors.forename: Tatiana Ramirez
authors.initials: TR
authors.lastname: Cunha
authors.forename: Maria Paula
authors.initials: MP
authors.lastname: Vecchia
authors.forename: Adriana Barbosa
authors.initials: AB
authors.lastname: Ribeiro
authors.forename: João Felipe
authors.initials: JF
authors.lastname: Bruniera
authors.forename: Yara Teresinha
authors.initials: YT
authors.lastname: Silva-Sousa
mesh_terms: D003828:Denture, Overlay; D008422:Materials Testing; D013718:Tensile Strength