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[目的]比较正畸治疗中拔除第三磨牙与拔除第一前磨牙在正畸治疗过程中的作用。[方法]选择拔除第三磨牙患者30例及拔除第一前磨牙患者30例,对两组治疗前后X线头颅侧位片进行测量分析。观察矫治前后第二磨牙在垂直方向、水平方向及倾斜角度的改变,比较两组间的差异。[结果]2组上颌第二磨牙垂直和水平移动的距离相比差异有统计学意义(P﹤0.05),但2组第二磨牙的倾斜角度相比差异无统计学意义(P﹥0.05)。2组下颌第二磨牙垂直移动的距离倾斜角度相比差异有统计学意义(P﹤0.05),但2组第二磨牙垂直移动的距离相比差异无统计学意义(P﹥0.05)。[结论]拔除第三磨牙较拔除第一前磨牙更有利于正畸治疗。
[Objective] To compare the role of removing third molar and removing first premolar during orthodontic treatment in orthodontic treatment. [Methods] Thirty patients with removal of the third molars and 30 patients with the first premolar removal were enrolled in this study. The X-ray cephalograms of the two groups before and after treatment were measured and analyzed. The changes of the second molars in the vertical direction, horizontal direction and tilt angle before and after treatment were observed, and the differences between the two groups were compared. [Result] There was significant difference in the vertical and horizontal distance between the second molar and the second molar (P <0.05). However, there was no significant difference in the tilt angle of the second molar between the two groups (P> 0.05). There were significant differences in the vertical tilt of the second molar between the two groups (P <0.05), but there was no significant difference in the vertical distance between the two groups (P> 0.05). [Conclusion] The removal of the third molars is more conducive to the orthodontic treatment than the removal of the first premolar.