Retention degradation of two milled bar systems versus solitary attachments for implant mandibular overdentures: An in vitro study

These findings suggest that, under in vitro conditions, splinted bar attachments, regardless of interface design, offer greater long-term retention durability than solitary systems, considering their use may be advantageous in adequate prosthodontic space. The predictable linear degradation pattern of bar systems in this in vitro model suggests a potential mechanical rationale for less frequent maintenance (e.g., clip/matrix replacement every 3-4 years), in contrast to the more rapid and erratic degradation observed for solitary studs, which would imply a need for more frequent intervention in a clinical setting.