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

作　　者：韩晓利[1] 肖丹娜[2] 尹硕[1] HAN Xiaoli;XIAO Danna;YIN Shuo(Graduate School, Tianjin Medical University, Tianjin 300070, China;Department of Orthodontics, Tianjin Stomatological Hosptial, Tianjin 300040, China)

机构地区：[1]天津医科大学研究生院,天津300070 [2]天津市口腔医院正畸科,天津300040

出　　处：《口腔疾病防治》2017年第7期458-461,共4页Journal of Prevention and Treatment for Stomatological Diseases

基　　金：国家临床重点专科建设项目(国卫医办函[2013]544号)

摘　　要：目的通过比较不同拔牙模式正畸治疗后第三磨牙位置的改变,探讨拔除下颌第一磨牙对发育中的第三磨牙萌出的影响。方法选择39例青少年患者,并分为3组:下颌第一磨牙拔除组、第一前磨牙拔除组及不拔牙组,所有患者正畸治疗前后均拍摄全颌曲面断层片,比较研究第三磨牙萌出的各项评价指标的变化。结果下颌第三磨牙萌出间隙和萌出角度在正畸治疗前后的年平均变化量,第一磨牙拔除组>第一前磨牙拔除组>不拔牙组,且差异具有统计学意义(P<0.05);下颌第三磨牙萌出间隙的年平均变化量,3组分别为(2.38±1.62)mm、(1.61±0.90)mm和(1.08±1.49)mm;萌出角度的年平均变化量,3组分别为1.89°±1.93°,1.37°±1.16°,和0.83°±1.74°。结论拔除下颌第一磨牙矫治可使第三磨牙的萌出间隙明显增加并使其萌出角度有所改善,对第三磨牙的萌出有利。Objective To investigate the effects of the first molar on the eruption of the third molar by comparingthe changes of the third molar position after orthodontic treatment in different tooth extraction modes.Methods39cases of adolescent patients were selected and divided into three groups:the first molar extraction,first premolar extraction and non-extraction.The pretreatment,posttreatment panoramic radiographs were measured to analyze the change ofthe third molar position among these groups.Results There were significant differences(P<0.05)in the average annual variation of the third molar eruption space and angle.The changes in first molar extraction group were larger thanthat in premolar extraction group and non-extraction group.The average annual variation of the third molar eruptionspace,three groups were(2.38±1.62)mm,(1.61±0.90)mm and(1.08±1.49)mm;the average annual variation oferuption angle,the three were1.89°±1.93°,1.37°±1.16°and0.83°±1.74°.Conclusion Compared with conventional treatment,mandibular first molar extraction can significantly increase the third molar eruption space and improveits 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 

分 类 号：R783.5[医药卫生—口腔医学]