| Objective: To compared the changes in horizontal bone volume,degree of resorption and complications of allogeneic bone block graft and autogenous bone block grafts in reconstructing alveolar ridge defects.And to explore the effectiveness of allogeneic bone block graft in alveolar ridge augmentation.Materials and methods: A total of 16 patients who underwent Onlay bone grafting in this Hospital from July 2015 to August 2020 were collected,including 8 patients with allogeneic bone block graft and 8 patients with autogenous bone block graft.In each patient,cone-beam computed tomography(CBCT)was used to collect imaging data before bone block graft,immediately postoperative,and 6 months after the bone grafting.The basal width,midway width and crestal width of the horizontal alveolar ridge obtained in the three measurement planes was measured in these three periods.We compared the bone width augmentation of the alveolar ridge,the amount and rate of bone resorption of the graft,and the complications in the operative area.Results: Six months after bone grafting,the bone width augmentation of allogeneic bone block graft obtained in the basal,midway,and crestal planes of the alveolar ridge were 3.01±1.40 mm,3.04±0.92 mm,and 3.03±0.97 mm,respectively,and the bone width resorption was 0.65±0.25 mm,0.91±0.19 mm,and 0.87±0.40 mm,respectively.The bone width augmentation of allogeneic bone block graft obtained in all three measurement planes was lower than that of autogenous bone block,but there was no statistical difference(p>0.05),while the bone width resorption of allogeneic bone block was higher than that of autogenous bone block in all three measurement planes,but there was no statistical difference(p>0.05).Allogeneic bone block shows higher bone width resorption(22.19%±8%)than autogenous bone block(16.57%±6%)(p<0.05).In both groups,there was all one case of wound dehiscence and exposure of the graft after bone grafting one month,but there was no significant infection in either group.After trimming the sharp edges of the graft and prolonging the healing period the good results were achieved in both cases.Conclusion: Although the resorption rate of allogeneic bone block is higher than that of autogenous bone block,it can still reconstruct alveolar ridge defects and obtain predictable augmentation results.Because of the unique advantages of its application,it can be a viable alternative material to autogenous block bone graft,but its long-term results still need long-term follow-up to obtain sufficient clinical evidence. |
