不翻瓣与微型翻瓣种植术下犬种植体周围骨愈合效果比较

目的]观察不翻瓣和微型翻瓣手术对犬下颌骨模型种植体周围牙槽嵴变化的影响.方法]拔除12只犬下颌骨双侧前磨牙及磨牙,弄平牙槽嵴,待3个月愈合后通过不翻瓣与微型翻瓣手术方法在犬下颌骨两侧分别植入2枚种植体.3个月后先处死6只实验犬,以评估Ⅰ期手术后牙槽嵴的变化.剩余6只接受Ⅱ期手术,在微型翻瓣术部位暴露种植体,并安放愈合基台,经过2个月愈合时间后处死,以评估Ⅱ期手术后牙槽嵴的变化.结果]Ⅰ期手术至Ⅱ期手术期间微型翻瓣术的种植体周围骨高度水平显著高于不翻瓣术(P<0.05),但Ⅱ期手术后,2种手术方法下种植体周围骨高度水平间差异无统计学意义(P>0.05).结论]种植体周围骨丧失总量上,不翻瓣术和微型翻瓣术并无明显差异,但在植入早期阶段,微型翻瓣术更有效地加强种植体支抗.

Bone healing around implants following flapless and mini-flap surgeries in dogs

OBJECTIVE To compare the effects of flapless and mini-flap surgeries on crestal bone changes around implants by using a canine mandible model.METHODS Bilateral,edentulated,flat alveolar ridges were created in the mandible of 12 mongrel dogs.After three months of healing,two implants were placed on each side of the mandible by flapless or mini-flap procedures.After a healing period of three months,six dogs were sacrificed to evaluate crestal bone changes after stage Ⅰ surgery.In the other six dogs,a second stage surgery and transmucosal abutment attachment were performed for mini-flap implants.After a healing period of two months,the remaining dogs were sacrificed to evaluate crestal bone changes after stageⅡ surgery.RESULTS When the mean peri-implant bone levels for flapless and mini-flap implants from stage Ⅰ to stageⅡ surgeries were compared,the mini-flap implants had a significantly greater height than the flapless implants（P0.05）;however,after stageⅡ surgery,both flapless and mini-flap implants had comparable bone levels（P0.05）.CONCLUSION Although there are no differences between flapless and mini-flap surgeries with respect to the overall amount of peri-implant bone loss,mini-flap surgery is more effective than flapless surgery in improving implant anchorage in the early phase after implant placement.