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目的:探讨正畸治疗中影响微种植支抗位移的因素。方法:选择26例拔除上颌第一前磨牙的安氏Ⅱ1类正畸病例共52颗微种植钉作为研究对象,男5例,女21例,年龄14～25岁。在上颌第一磨牙和第二前磨牙牙根之间植入微种植钉作支抗,随机选择加载时机、施力方式和施力的初始力值,根据临床需要选择力作用线与牙合平面夹角和施力持续时间。分别在施力前后拍摄头颅侧位定位片,测量种植钉头部在施力前后的位置变化。通过单个样本的t检验比较施力前后种植钉的位移量变化;用独立样本t检验比较不同性别及不同施力方式对种植钉的位移量的影响;以种植钉的位移量(D)为应变量,以加载开始时间(W)、施力持续时间(T)、施力的初始力值(F)、力作用线与牙合平面夹角(A)、年龄(Y)为自变量,通过多元逐步回归法建立多元回归方程,用以分析各自变量对应变量的影响作用。结果:施力后种植钉的位移量为0.42±0.28 mm(P<0.05),性别和施力方式对种植钉位移量的影响无统计学意义(P>0.05)。自变量与应变量依存关系的多元回归方程为:D=0.5467-0.0751W+0.0168T-0.0219Y。结论:施力后微种植支抗可产生位移,位移量的大小与加载开始时间、施力持续时间和年龄有关。
Objective: To explore the factors affecting the displacement of micro-implanting support during orthodontic treatment. Methods: Twenty-two cases of Class Ⅱ 1 orthodontics with maxillary first premolar removal were selected as study objects. There were 5 males and 21 females, aged from 14 to 25 years old. Implantation of microdialysis nail between the maxillary first molars and the second premolar root as the support, randomly select the timing of loading, the mode of application of force and the initial force value of the force. According to the clinical needs, select the force line and the occlusal plane clamp Angle and the duration of the force. Before and after the force were taken in the skull lateral positioning film to measure the planting nail head position before and after the force changes. The t test was used to compare the displacement of implant nail before and after the force exertion. The t-test with independent samples was used to compare the effect of different sex and different force exertion on the displacement of implant nail. The displacement (D) The variables were defined as the loading start time (W), the duration of force application (T), the initial force value of force application (F), the angle between force line and occlusal plane (A) and age Multiple stepwise regression method to establish multiple regression equations to analyze the impact of their respective variables on the impact of variables. Results: The displacement of implanted nail was 0.42 ± 0.28 mm (P <0.05) after application of force. There was no significant difference in gender and force exertion on the displacement of implanted nail (P> 0.05). The multiple regression equation of independent variables and dependent variables is: D = 0.5467-0.0751W + 0.0168T-0.0219Y. Conclusion: Micro-implanting anchors can exert displacement after applied force. The amount of displacement is related to loading time, duration and age of force application.