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

O-ring retention is popularly employed for miniimplant-supported overdentures,1 which have been effectively used for immediate loading protocols. They are less costly than standard implants2 and are often placed in thin mandibular ridges via a single-stage, flapless surgical technique.3 However, O-rings demand periodic replacement due to retention loss, which varies considerably among different manufacturers.4 This preliminary in vitro study evaluated the retention force of an attachment system for mini-implants after insertion-removal and simulated masticatory cycles corresponding to a 6-month wearing period. Wear pattern was also evaluated using microscopic computed tomography (micro-CT) and compared with specimens obtained from participants in a clinical trial of mini-implant overdentures.

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