不同种植方法对即刻负载正畸种植体骨结合的影响

目的 通过比较助攻法和自攻法植入的即刻负载正畸种植体的骨结合情况,评价不同种植方法对种植体及周围组织的影响. 方法 以3只犬的最后一颗前磨牙与第一磨牙根间区、第一磨牙近远中根根分歧的颊侧为植入点,植入24枚正畸种植体;每只犬植入8枚,自攻法(自攻组)植入4枚,助攻法(助攻组)植入4枚.镍钛弹簧即刻提供1.47～1.96 N水平力,持续9周.光学显微镜和荧光显微镜评价种植体周围骨组织的变化和骨结合率. 结果 两组种植体均与骨组织形成骨结合,其间未见结缔组织.自攻组可见较多的陈旧骨,助攻组的骨生长和再生更活跃.自攻组种植体的骨结合率[(41.7±10.7)%]高于助攻组[(25.9±8.0)%],差异有统计学意义(P<0.01). 结论 即刻负载不影响正畸种植体的骨结合.自攻法对骨组织损伤小,且骨结合率高于助攻组.

0steointegration of orthodontic microscrew implants under immediate loading in dogs

Objective To investigate the osteointegration of with self-drilling and self-tapping microscrew implants under immediate loading histomorphometrically. Methods The buccal side of upper and lower jaws of three dogs was chosen as implant receipt site. Each dog accepted 8 implants (4 self-drilling and 4 self-tapping implants). Approximately 1.47-1.96 N continuous and constant forces were immediately applied between two microscrew implants with nickel-titanium coll spring for 9 weeks. Undecalcified sections of implants and surrounding tissue were studied with light microscope and fluorescent microscope. Results Osteointegration was seen in all samples and no fibrous tissue was seen between bone and implant. More original bone was seen in self-drilling group. Modeling and remodeling were more active in self-tapping group. Bone-to-implant contact values were statistically significant higher in self-drilling group[(41.7±10.7)%]than in self-tapping group[(25.9±8.0)%,P<0.01]. Conclusions Immediate loading had no influence on osteointegration in both serf-drilling and self-tapping groups. The rates of bone-to-implant contact were higher in self-drilling group.