三种骨替代材料修复犬下颌种植体周围骨缺损的实验研究

目的:本研究旨在通过自固化磷酸钙活性人工骨(CPC/rhBMP-2)、自固化磷酸钙(calcium phosphate cement,CPC)、生物活性玻璃倍骼生(PerioGlas)修复种植体周围骨缺损的动物实验研究,比较三种材料修复种植体周围骨缺损的效果。方法:选取3只beagle犬,每侧下颌各拔除第三、四前磨牙及第一磨牙,3个月后,制备种植窝,然后在每侧下颌骨分别植入2枚纯钛骨融合式螺旋状种植体(直径3.3 mm,长度10 mm),同时在每个种植体冠部制成宽1～1.25 mm,深5 mm的环沟型骨缺损。采用自身对照,每只犬下颌的4枚种植体周的骨缺损作不同处理,随机分组结果如下:A组空置,B组植入PerioGlas,C组植入CPC,D组植入CPC/rhBMP-2。术后3个月取样本,制成带种植体的超硬组织切片,进行组织形态学观察,骨结合百分率测定和计算机组织图像分析。结果:B、C、D组种植体周围骨缺损均有新骨形成,植骨区骨-种植体结合率D组(49.48%)最高,C组(46.16%)次之,B组(42.71%)再次,A组(33.68%)最低,但差异无统计学意义(P>0.05)。结论:自固化磷酸钙活性人工骨、自固化磷酸钙、倍骼生这3种材料均能促进种植体周围骨缺损的骨再生。组织学结果显示自固化磷酸钙活性人工骨的新骨形成及成熟度,材料降解均优于其余3组。

Evaluation of Three Bone Substitutes in the Treatment of Peri-implant Defects

Objective: To evaluate the effects of three bone substitute materials on the closure of a marginal hard tissue defect adjacent to implants.Methods: In three beagle dogs,the third and the fourth premolars and first molars on both sides of the mandible were extracted.3 months later,mucoperiosteal flaps were elevated and two experimental sites were prepared for implant installation in each side of the mandible.A step drill was used to widen the marginal to 5.3 mm of the canal.Following the placement of the imp...