近中阻生下颌第三磨牙与下颌第二磨牙牙根外吸收的CBCT研究  

External Root Resorption of Second Molar Associated with Mesially Impacted Mandibular Third Molar Based on CBCT

作　　者：于天平 王荣 杨斌 YU Tianping;WANG Rong;YANG Bin(Department of Stomatology,Shijingshan Teching Hospital of Capital Medical University,Beijing Shijingshan Hospital,Beijing 100040,China)

机构地区：[1]首都医科大学石景山教学医院北京市石景山医院口腔科,北京100000

出　　处：《口腔医学研究》2022年第10期968-971,共4页Journal of Oral Science Research

摘　　要：目的:通过CBCT观测研究近中阻生下颌第三磨牙(mandibular third molar,MTM)的临床特征与下颌第二磨牙牙根外吸收(mandibular second molar external root resorption,MSMERR)的关系。方法:随机选取2021年6月1日~2021年12月31日于北京市石景山医院口腔科就诊的近中阻生MTM患者的CBCT影像资料为研究对象,观察同侧MSMERR存在与否,对患者的性别、年龄、MTM的阻生角度、MTM萌出高度、MTM近中以及MSM远中釉牙骨质界之间的距离(MTMMCEJ-MSMDCEJ)以及接触点位置等进行记录,并分析各个因素对下颌第二磨牙ERR的影响。结果:(1)MSMERR的概率为15.89%;(2)MSMERR与年龄、MSM咬颌平面与MTM咬颌平面夹角(a)°以及MTMMCEJ-MSMDCEJ距离有关;(3)当患者年龄≥35岁,MSM咬颌平面与MTM咬颌平面夹角(a)°为45°~60°以及MTMMCEJ-MSMDCEJ大于6 mm时,MSMERR危险程度增加。结论:当年龄大于35岁、影像学检查发现MTM与MSM夹角在45°~60°、或者MTMMCEJ-MSMDCEJ大于6 mm时,可视为预防性拔除MTM的指导原则。Objective:To analyze the relationship between mandibular third molar(MTM)and external root resorption(ERR)of mandibular second molar by CBCT.Methods:CBCT scans involving 302 MTMs were assessed.The patient gender and age,mesial angulation and impaction depths of MTMs,and MTMMCEJ-MSMDCEJ distances and contact point localization were assessed.The relationship between each factor and the ERR was analyzed.Results:The detection rate of ERR in second molars was 15.89%.Age,the angle of occlusion between MTM and mandibular second molar,and MTMMCEJ-MSMDCEJ were identified as risk factors for ERR.When the age≥35 years,the angle of occlusion was 45°-60°,and MTMMCEJ-MSMDCEJ>6 mm,ERR was significantly increased.Conclusion:The age(≥35 years),the angle of occlusion 45°-60°,and MTMMCEJ-MSMDCEJ(>6 mm)could be regarded as the guidelines for preventive removal of MTM.

关 键 词：下颌第三磨牙 近中阻生 下颌第二磨牙 牙根外吸收 CBCT 

分 类 号：R783.5[医药卫生—口腔医学]