This study compared peri-implant vertical bone loss, the periodontal index, prosthodontic maintenance requirements and oral health-related quality of life of patients (OHQoL) using mandibular implant-supported overdentures with two different attachment systems after an average of 5 years of use.16 mandibular overdenture patients with magnet attachments (Group 3), 24 with implant-supported mandibular overdentures with Locator attachments (Group 2), and 25 conventional complete denture patients (Group I) were included in the study. The existing at least 5 years old dentures of all patients were evaluated for prosthodontic maintenance by the same prosthodontist and the patients were administered the OHIP-TR-14 questionnaire. Peri-implant tissue health was evaluated clinically in terms of plaque scores, bleeding scores, probing depth and gingival index. Radiographic evaluation was performed in terms of periimplant vertical bone loss. Radiographic evaluations were performed 5 year after overdenture insertion.There were no statistically significant differences between the groups in terms of total OHIP-TR-14 scores (p > 0.05). While the average vertical bone resorption measured in Group 2 at the end of 5 years was 1.38 mm, there was an average vertical bone loss of 1.45 mm in Group 3, but this difference was not statistically significant (p > 0.05). Among the periodontal health indicators, there were no statistically significant differences in the mean values ​​for periodontal indexes.According to results of the study; there were no differences in peri-implant vertical bone loss in Group2  and 3, in periodontal health in mandibular overdentures with Group2 and 3, or between total OHIP-TR-14 scores of patients in all groups.

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