拔除第一前磨牙对第三磨牙倾角的影响

华西口腔医学杂志

拔除第一前磨牙对第三磨牙倾角的影响

何玉宏1, 段银钟2, 潘继军1, 席兰兰1

1.济南军区总医院口腔科, 山东济南250031; 2.第四军医大学口腔医院正畸科, 陕西西安710032

收稿日期:2008-08-25 修回日期:2008-08-25 出版日期:2008-08-20 发布日期:2008-08-20
通讯作者: 段银钟，Tel：029- 84776131
作者简介:何玉宏（1979-），男，山东人，主治医师，硕士

Effects of the fir st pr emolar extr action on the third molar angulation

HE Yu - hong1, DUAN Yin - zhong2, PAN Ji- jun1, XI Lan- lan1

1. Dept. of Stomatology, General Hospital of Jinan Military Area, Jinan 250031, China; 2. Dept. of Orthodontics, School of Stomatology, The Fourth Military Medical University, Xi′an 710032, China

Received:2008-08-25 Revised:2008-08-25 Online:2008-08-20 Published:2008-08-20
Contact: DUAN Yin - zhong，Tel：029- 84776131

摘要/Abstract

摘要：

目的研究正畸治疗中拔除第一前磨牙进行矫治和非拔牙矫治对第二磨牙和第三磨牙倾角的影响。方法选择56例上下颌第三磨牙均存在的青少年正畸患者，按拔牙与否分为拔牙组（30例，拔除4颗第一前磨牙）和非拔牙组（26例），通过术前术后曲面断层片来测量患者上下颌第三磨牙长轴和平面的交角，第二磨牙与平面的交角以及第二、第三磨牙长轴的交角，并进行统计学分析。结果拔牙与非拔牙组矫治前后第三磨牙倾角均有不同程度的改善。与非拔牙组相比，拔牙组上下颌第三磨牙长轴与平面交角的变化量更大，2组间年平均变化量的差异有统计学意义（P<0.05）；2组矫治前后上下颌第二、第三磨牙长轴交角的变化无统计学差异，但其年平均变化量在2组间则有统计学差异（P<0.05）。2组间上颌第二磨牙与平面交角的年平均变化量无统计学差异（P>0.05），而下颌第二磨牙与平面交角的年平均变化量则有统计学差异（P<0.05）。结论拔除第一前磨牙进行正畸治疗有利于第三磨牙倾角的改善，对第三磨牙萌出有积极意义。

关键词: 第一前磨牙拔除, 非拔牙矫治, 第三磨牙倾角

Abstract:

Objective To analyze the effects about inclinations of the second and the third molars in patients treated with or without premolar extractions. Methods Fifty- six adolescents were chosen and divided into the first premolar extraction and non- extraction groups, 30 and 26 patients respectively. The pre- treatment and post- treatment panoramic radiographs were made. Angles between long axis of the third molar and the occlusal plane（the second molar alike）, and long axis of the second and the third molar were measured and evaluated. Results The maxillary and mandibular third molar angulations were all improved after treatment in two groups. Compared with non - extraction group, the average changes of angle between long axis of the third molar and the occlusal plane increased significantly in maxilla and mandible（P<0.05）. Average changes of angles between long axis of the second and the third molar decreased and had statistically significant difference（P<0.05）. The change of angle between long axis of mandibular second molar and the occlusal plane had statistically significant difference（P<0.05）, but there was no statistically significant difference in maxillary second molar（P >0.05）. Conclusion The first premolar extraction in orthodontic treatment could improve the third molar angulations and it would promote the eruption of the third molar.

Key words: the first premolar extraction, non- extraction treatment, the third molar angulation

何玉宏段银钟潘继军席兰兰. 拔除第一前磨牙对第三磨牙倾角的影响[J]. 华西口腔医学杂志.

HE Yu - hong1, DUAN Yin - zhong2, PAN Ji- jun1, XI Lan- lan1. Effects of the fir st pr emolar extr action on the third molar angulation[J]. West China Journal of Stomatology.