Effect of implant supported overdenture with different bar attachment modalities on the implant and overdenture supporting structure

Purpose: This study examined effect of clip and Retention.sil as bar method of attachment on the implant and overdenture supporting structure. Material and methods: In a randomized-controlled clinical trial, 14 edentulous males patients (mean age 57.5 years) were equally assigned to two groups. In each patient, two implants were inserted in the canine area of the mandible using a twostage surgical protocol. After 3 months, the implants were connected with resilient bars. Mandibular overdentures were retained to the bars with either clips (group I) or Retention.sil (group II). Peri-implant and vertical alveolar bone changes were evaluated radiographically. Evaluations were performed at the time of overdenture insertion (M0), 6 months (M6) and 12 months (M12) after overdenture insertion. Results: There was a statistically significant difference in vertical alveolar bone changes between bar and Retention.sil. The clip vertical alveolar bone loss where been higher than that of Retention.sil in all situations. Conclusion: After 12 months of using bar-implant-retained mandibular overdenture, the Retention.sil attachment had significantly decreased vertical bone loss when compared with the clip attachment. © 2019, Ain Shams University, Faculty of Dentistry. All rights reserved.