不同植入角度对犬正畸支抗种植体稳定性的影响  

Effect of inserted angle on the stability of loaded microscrews

作　　者：邵培[1,2] 许桢睿 赵立星[1] 赵志河[1] Shao Pei Xu Zhenrui Zhao Lixing Zhao Zhihe(State Key Laboratory of Oral Diseases, Sichuan University, Chengdu 610041, China Department of Orthodontics, Jinqin International Dental Clinic-Shuangnan Branch, Chengdu 610041, China)

机构地区：[1]四川大学口腔疾病研究国家重点实验室,成都610041 [2]中航工业三六三医院口腔科,成都610041 [3]成都金琴口腔双楠国际门诊部正畸科,610041

出　　处：《中华口腔医学杂志》2017年第1期39-43,共5页Chinese Journal of Stomatology

基　　金：国家自然科学基金（30470436）

摘　　要：目的：评估不同植入角度对犬正畸支抗种植体稳定性的影响，以期为临床提供参考。方法将48枚正畸支抗种植体以4种角度（30°、50°、70°和90°）分别植入12只比格犬下颌骨双侧第一磨牙与第三前磨牙根间区（每组3只犬，12枚种植体），植入后即刻加载2 N力8周。取种植体-骨标本并固定后，记录拉拔实验的最大拔出力值（Fmax）；制备超硬组织切片，观察组织学变化并定量计算骨结合率，综合评价种植体-骨界面的骨整合情况。结果 Fmax和骨结合率均显示植入角度对正畸支抗种植体的骨整合及稳定性有显著影响。50°组Fmax最大[（385±23）N]，30°组Fmax最小[（198±16）N]，差异有统计学意义（P＜0.05）；70°组骨结合率最高[（59.1±6.0）%]，30°组骨结合率最低[（30.2±3.2）%]，差异有统计学意义（P＜0.05）。组织形态学观察显示，各组种植体周围区骨重建程度不同。结论以50°~70°的轻度倾斜角度植入正畸支抗种植体有利于其加载后的稳定性。Objective To evaluate the effect of different insertion angles on the osseointegration of loaded microscrews in beagle jaws. Methods Forty-eight microscrews were inserted at four different angles （30° , 50° , 70° and 90° ） into the interradicular zones between the mandibular first molar and third premolar in twelve beagles and the microscrews had been loaded with a force of 2 N immediately for 8 weeks. After microscrew-bone specimens fixed, the maximum output value （Fmax） of pull-out test was recorded and the histomorphological changes of hard tissue were observed. The bone-implant contact （BIC%） was quantitatively analyzed and the osseointegration of microscrew-bone interface was comprehensively evaluated. Results Both Fmax and BIC%values of microscrews were influenced by the insertion angles. The maximum value of Fmax was （385 ± 23） N in the group with 50° angle, and the minimum value was （198 ± 16） N in the group with 30° angle（P〈0.05）. The maximum value of BIC%was （59.1±6.0）%in the group with 70° angle, and the minimum value was （30.2 ± 3.2）%in the group with 30° angle （P〈0.05）. Histomorphology observation revealed that in peri-screws region, the various degree of bone remodeling was found in different angle samples. Conclusions The insertion angles （50°and 70°） were favorable to the stability of the microscrew.

关 键 词：生物力学 骨整合 正畸支抗 微螺钉种植体 

分 类 号：R783.5[医药卫生—口腔医学]