الفهرس 
-Only 14 pages are availabe for public view
 |  | from | 152 |  |  |
| | | from | 152 | | |
Abstract
Purpose: The aim of this study was to evaluate the final vertical bone gain in the vertically deficient anterior maxillary ridge (esthetic zone) using segmental sandwich osteotomy with simultaneous versus delayed implant placement.
Methods: This study included 16 patients that had multiple missing maxillary anterior teeth with a vertically deficient alveolar ridge resulting in an increased inter-arch space. The patients were randomly assigned into two equal groups. Patients in both groups were treated with vertical ridge-augmentation using anterior maxillary segmental sandwich osteotomy and interpositional (inlay) bone grafting using particulate bovine bone graft. The transported bone segment was fixed in its position using simultaneous implant placement in a single-stage surgery in the study group. Whereas micro-plates and screws were used in the control group, followed by a second-stage surgery for plates removal and delayed implant placement. Radiographic assessment included the 4 months post-operative mean of vertical bone gain and percentage of bone gain relative to preoperative height of alveolar ridge at the implant sites, taken from the cross sections of a cone beam computed tomography. Resonance frequency analysis was used for each implant in both groups for assessment of secondary implant stability.
Results: Postoperative follow-up was uneventful for all patients included in the study, and a total of 35 implants were placed in both groups. Results of this study showed comparable means of vertical bone gain and gain percentage between the two groups. The mean vertical bone gain in the study group was 4.04±0.59mm compared to 3.86±0.52mm in the control group with no statistically significant difference (p=0.518). The mean value of bone gain percentage in the study group was 33.02±5.64% compared to 31.75±5.49% in the control group with no statistically significant difference (p=0.656). The mean value of Implant Stability Quotient (ISQ) for the study group (69.12±2.29) was comparable to that of the control group (70.17±2.01) with no statistically significant difference (p=0.160) in terms of secondary implant stability.
Conclusion: Within the limitation of this study, the use of simultaneous implant placement in segmental sandwich osteotomy of the anterior maxilla helps to eliminate the need for a second-stage surgery and shortens the time for prosthetic rehabilitation, with comparable results to conventional inlay bone grafting in terms of final bone gain and secondary implant stability.