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目的:评价正畸用微螺钉支抗种植体的稳定性及影响因素。方法:比较13例患者32颗微螺钉不同的应用设计、植入部位、植入高度、植入次数、牙龈和黏膜反应、加力时机、初期稳定性等因素,应用SAS10.0软件包进行单因素和多因素方差分析,明确影响成功率的因素。结果:32颗微螺钉中,成功29颗,成功率为90.6%。患者年龄与微螺钉的稳定性相关(P=0.04),18岁以下成功率为75%,大于18岁成功率可达100%。植入早期的异常外力影响骨结合,一旦获得骨结合后,长期施加正畸力不会影响微螺钉的稳定。微螺钉周龈炎,甚至化脓性感染(2例)不会破坏已获得的钉-骨间骨结合。植入牙龈的位置,上、下颌间,左、右侧位置间,早期加载与后期加载间的成功率无显著差异。同一个微螺钉多次植入不影响成功率。结论:初期稳定性是影响微螺钉长期稳定的最重要因素,软组织的轻微炎症不会影响骨结合。
Objective: To evaluate the stability and influencing factors of orthodontic micro-screw anchors. Methods: The application design, implantation site, implantation site, implantation times, gingival and mucosal responses, timing of application of force, initial stability and other factors of 32 micro-screws in 13 patients were compared. SAS10.0 software package was used for single Factors and multivariate analysis of variance, a clear impact on the success rate of the factors. Results: Of the 32 micro-screws, 29 were successful with a success rate of 90.6%. The patient’s age was associated with the stability of the micro-screw (P = 0.04), with a success rate of 75% below 18 years of age and a success rate of 100% over 18 years. Implantation of early abnormal external forces affect the osseointegration, once the bone is obtained, long-term orthodontic force will not affect the stability of micro-screw. Micro-screw gingivitis, and even purulent infection (2 cases) will not destroy the nail-bone union has been obtained. There was no significant difference in the success rate between early loading and late loading in the location of implants, upper and lower jaw, left and right positions. The same number of micro-screw implantation does not affect the success rate. CONCLUSIONS: Initial stability is the most important factor affecting the long-term stability of micro-screws. Mild inflammation in soft tissue does not affect osseointegration.