TM种植体-骨结合界面的显微CT观察

目的 研究TM种植体-骨结合界面及其上 1/3倒楔形间隙的成骨情况.方法 用医用钝钛钛棒加工成两组种植体,实验组为锥度5.44°、表面进行喷砂酸蚀处理的TM种植体,锥度从种植体上1/3处开始变化；对照组为仿straumann的表面喷砂酸蚀(sandblast large grit and acid-etching,SLA)圆柱状螺纹种植体.建立Beagle犬下颌骨种植模型,3只犬每只植入实验组TM种植体和对照组仿straumann -SLA圆柱状螺纹种植体各4枚,3只实验犬分别于4周、8周和12周处死,截取下颌骨行显微CT三维重建,观察种植体-骨结合界面及上1/3间隙的成骨情况.结果 8周时实验组TM种植体上1/3倒楔形间隙开始有骨修复,12周时对照组仿straumann-SLA种植体颈部骨质有吸收迹象,实验组TM种植体颈部骨质仍得到良好保存.结论 TM种植体能形成良好骨结合界面,体部上1/3的锥度设计可保存颈部皮质骨.

Micro-CT evaluation of implant-bone contact interface on TM implant

Objective To evaluate the implant-bone contact interface and bone formation of tension more(TM) implant.Methods TM implants and imitation of straumann-sandblast large grit and acid-etching implants(implants used as control) were made to place into the mandible of beagle dogs.After 4 weeks,8 weeks and 12 weeks,implants in the mandible were sectioned to analyzed by micro-CT.Results Implants were treated by Al2O3 blasting and acid etched reached above 60 percentage of implant-bone contact.After 8 weeks,the reverse-tapered gap of TM implant were repaired by bone.After 12 weeks,the bone on the neck of control implants had sign of absorption,whereas TM implant preserved the bone around the neck.Conclusion TM implant surface property is good for osseointegration,so the cortical bone area around implant neck were preserved.