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Aim of the study: This study was conducted to assess the efficacy of different guided surgery protocols on mean marginal bone loss around implants in implant assisted mandibular overdenture. Materials and methods: Twenty-one edentulous patients were selected for this study. They were randomly divided into three different groups. In the first group implants were placed by free hand technique. In the second group partial limiting surgical guide was used; the surgical guide was used for pilot drilling. In the third group completely limiting surgical guide was used; the surgical guide was used for the whole drilling sequence. Mean marginal bone loss was measured using CBCT at 6 months, 12month and 18 months interval. Results were collected and tabulated for statistical analysis. Results: One-way ANOVA test showed no statistical significance between the three groups in all time intervals. Conclusion: Within the limitation of this study, no statistically significant differences could be found between the guided groups and the free hand group at the 18 months follow-up period.

COMPARING THREE DIFFERENT SURGICAL GUIDES PROTOCOL ON THE MARGINAL BONE LOSS AROUND IMPLANTS IN IMPLANT ASSISTED MANDIBULAR OVERDENTURE.