摘要
目的:探讨高植入扭力对种植体-骨界面组织愈合的影响。方法:将36枚微型种植体以(14±1)Ncm及(11±1)Ncm的扭力植入4只Beagle犬的下颌牙槽骨,观察7 d及28 d的组织学、组织形态测量学及扫描电镜变化。结果:14 Ncm组植入后7 d界面密骨质有重度微损伤,28 d骨界面仍有许多碎骨屑。而11 Ncm组7 d骨质轻度微损伤,28 d骨愈合良好。2组种植体-骨结合率(BIC)无显著差异(P>0.05),7 d时,2组种植体-骨密度(BD)值差异无统计学意义(P>0.05),但28 d时,11 Ncm组BD值明显高于14 Ncm组(P<0.05)。结论:适度扭力植入种植体的骨界面损伤小、愈合快,而过高植入扭力可造成骨界面严重微损伤,影响骨组织愈合。
Objective： To study interfacial bone healing after mini-implants inserted by different torques.Methods： 36 mini-implants were placed in the mandibular alveolar bone of 4 adult male Beagle dogs.（14±1） Ncm and（11±1） Ncm insertion torque were applied in the two groups respectively at the time of fixture placement.Bone tissue responses were evaluated by histological analysis at 7 and 28 days after implant placement respectively.Results： The histomorphologic observation showed that in the 14 Ncm group 7 days after implantation,bone around the implants had severe micro-injury.28 days after implantation,there were still many bone chips in bone interface.In the 11 Ncm group 7 days after implantation,bone micro-damage was mild,bone healed well after 28 days.The implant-to-bone contact ratio（%） was not significantly different（P〉0.05）.The implant-to-bone density（BD） value of the two groups was not significantly different 7 days after implantation（P〉0.05）,but after 28 days,the BD of 11 Ncm group was significantly higher than that in 14 Ncm group（P〈0.05）.Conclusion： Moderate insertion torque is in favor of peri-implant bone healing,and excessive torque can cause interfacial bone micro-damage.
出处
《实用口腔医学杂志》
CAS
CSCD
北大核心
2012年第4期430-434,共5页
Journal of Practical Stomatology
基金
河北省科技支撑资助项目(编号:08276101D-4)
关键词
微型种植体
微损伤
植入扭力
骨整合
Mini- implant
Micro- damage
Insertion torque
Osseointegration
