Evaluation of Low – Profile Attachments for Implant – Retained Mandibular Overdentures in Restoring Cases with Limited Interarch Space

. AbstrAct The aim of the present study was to evaluate both ZAAG and OT REVERSE / 3 attachments retaining complete mandibular overdentures supported by two Legacy implants regarding both periimplant bone and residual ridge resorpotion and maintenance complications in patients with limited interarch space during a 2 year followup period. The two implants were placed in the canine region. Mandibular overdentures were provided for 12 edentulous male patients. Subjects were divided equally into ZAAG and OT REVERSE / 3 groups. Once patients were comfortable, they were placed on a one week, 6, 12 and 24 months follow -up periods. Marginal periimplant bone levels and distal residual ridge height were monitored on intraoral radiographs using long cone paralleling technique. Frequency of maintenance complications were also detected during the follow-up periods. A significant decrease in periimplant bone loss was recorded in favor to the OT REVERSE / 3 group. However a significant decrease in vertical residual bone loss was recorded in favor to the ZAAG group. It could be concluded that although mandibular implant–retained overdentures with OT REVERSE /3 attachments are an acceptable treatment option for edentulous patients with limited interarch space, routine maintenance is required to ensure successful long term outcomes.