口腔疾病防治2017，Vol.25Issue(7)：458-461,4.DOI:10.12016/j.issn.2096-1456.2017.07.011
正畸拔除下颌第一磨牙对第三磨牙位置变化的影响
Effect of orthodontic removal of mandibular first molar on the position change of third molar
摘要
Abstract
Objective To investigate the effects of the first molar on the eruption of the third molar by comparing the changes of the third molar position after orthodontic treatment in different tooth extraction modes. Methods 39 cases of adolescent patients were selected and divided into three groups:the first molar extraction, first premolar extrac-tion and non-extraction.The pretreatment, posttreatment panoramic radiographs were measured to analyze the change of the third molar position among these groups. Results There were significant differences (P<0.05) in the average an-nual variation of the third molar eruption space and angle. The changes in first molar extraction group were larger than that in premolar extraction group and non-extraction group. The average annual variation of the third molar eruption space, three groups were (2.38 ± 1.62) mm, (1.61 ± 0.90) mm and (1.08 ± 1.49) mm; the average annual variation of eruption angle, the three were 1.89° ± 1.93° , 1.37° ± 1.16° and 0.83° ± 1.74° . Conclusion Compared with conven-tional treatment, mandibular first molar extraction can significantly increase the third molar eruption space and improve its eruption angle, which is beneficial to the eruption of the third molar.关键词
全颌曲面断层片/第一磨牙/拔牙矫治/萌出间隙/萌出角度Key words
Panoramic radiograph/First molar/Extraction treatment/Eruption space/Eruption angle分类
医药卫生引用本文复制引用
韩晓利,肖丹娜,尹硕..正畸拔除下颌第一磨牙对第三磨牙位置变化的影响[J].口腔疾病防治,2017,25(7):458-461,4.基金项目
国家临床重点专科建设项目(国卫医办函[2013]544号) （国卫医办函[2013]544号）
