Aim: This study was performed to evaluate the movement of the proximal segment following different methods of ramus osteotomy that is one of the side effects of orthognathic surgery. Theoretically, with intraoral vert...Aim: This study was performed to evaluate the movement of the proximal segment following different methods of ramus osteotomy that is one of the side effects of orthognathic surgery. Theoretically, with intraoral verticosagittal ramus osteotomy, it can minimize the movement of the proximal segment. The changes in the intergonal distance of mandible and the angle of the ramus flaring in two methods of osteotomy have been compared in this study. Materials and Methods: In this randomized clinical trial, included 60 patients (32 males) with mandibular prognathism and without any asymmetry were selected and divided into two groups (n = 30). One group underwent bilateral sagittal split ramus osteotomy technique to achieve mandibular setback and the other by the intraoral verticosagittal ramus osteotomy technique. Intergonial width and inner-ramal angle in the transverse plane were measured on radiographs preoperatively and 1 and 12 weeks postoperatively. Data were analyzed using covariance test with the significance level set at P 0.1). Conclusion: Considering our findings, there was no significant difference between two ramus osteotomy techniques regarding changes in mandibular width and inter-ramal flaring angle.展开更多
Aim: Ridge augmentation for the atrophied mandible or for supporting dental implants is, an effective treatment in patients with alveolar defects that preserve bone height for the placement of implants or desirable ap...Aim: Ridge augmentation for the atrophied mandible or for supporting dental implants is, an effective treatment in patients with alveolar defects that preserve bone height for the placement of implants or desirable appearance. Two common substans for bone augmentation are autografts and allografts. However, it is difficult to demonstrate that one surgical procedure offers better outcomes than another. Our study aimed to address and compare changes in ridge augmentation following autograft and allograft bone grafting within a 6-month follow up period. Materials and Methods: In a randomized blinded clinical trial, 18 patients who were candidates for mandible bone grafts were randomly divided into two autograft (tibia graft) (n = 9) and allograft (n = 9) groups. In the autograft group demineralized frozen dried bone was used. Height of three local points on graft replacement (Right, Middle and Left points) were measured based on the OPG preoperatively and also 3 and 6 months after the grafting. Results: In all patient, the trend of ridge augmentation change was significant within 6 months following grafting;however no difference was observed in height changes between the autograft and allograft procedures. Conclusion: From the clinical point of view, these two procedures appear to have similar efficacies for treating localized mandibular ridge defects. Clinical Significances: Comparison the success rate and increase the anterior of mandibular height between autogenous bone graft and allogeneic bone graft.展开更多
文摘Aim: This study was performed to evaluate the movement of the proximal segment following different methods of ramus osteotomy that is one of the side effects of orthognathic surgery. Theoretically, with intraoral verticosagittal ramus osteotomy, it can minimize the movement of the proximal segment. The changes in the intergonal distance of mandible and the angle of the ramus flaring in two methods of osteotomy have been compared in this study. Materials and Methods: In this randomized clinical trial, included 60 patients (32 males) with mandibular prognathism and without any asymmetry were selected and divided into two groups (n = 30). One group underwent bilateral sagittal split ramus osteotomy technique to achieve mandibular setback and the other by the intraoral verticosagittal ramus osteotomy technique. Intergonial width and inner-ramal angle in the transverse plane were measured on radiographs preoperatively and 1 and 12 weeks postoperatively. Data were analyzed using covariance test with the significance level set at P 0.1). Conclusion: Considering our findings, there was no significant difference between two ramus osteotomy techniques regarding changes in mandibular width and inter-ramal flaring angle.
文摘Aim: Ridge augmentation for the atrophied mandible or for supporting dental implants is, an effective treatment in patients with alveolar defects that preserve bone height for the placement of implants or desirable appearance. Two common substans for bone augmentation are autografts and allografts. However, it is difficult to demonstrate that one surgical procedure offers better outcomes than another. Our study aimed to address and compare changes in ridge augmentation following autograft and allograft bone grafting within a 6-month follow up period. Materials and Methods: In a randomized blinded clinical trial, 18 patients who were candidates for mandible bone grafts were randomly divided into two autograft (tibia graft) (n = 9) and allograft (n = 9) groups. In the autograft group demineralized frozen dried bone was used. Height of three local points on graft replacement (Right, Middle and Left points) were measured based on the OPG preoperatively and also 3 and 6 months after the grafting. Results: In all patient, the trend of ridge augmentation change was significant within 6 months following grafting;however no difference was observed in height changes between the autograft and allograft procedures. Conclusion: From the clinical point of view, these two procedures appear to have similar efficacies for treating localized mandibular ridge defects. Clinical Significances: Comparison the success rate and increase the anterior of mandibular height between autogenous bone graft and allogeneic bone graft.
