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

doi:10.13701/j.cnki.kqyxyj.2022.10.014

口腔医学研究 ›› 2022, Vol. 38 ›› Issue (10): 968-971.DOI: 10.13701/j.cnki.kqyxyj.2022.10.014

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

于天平^*, 王荣, 杨斌

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

收稿日期:2022-03-22 出版日期:2022-10-28 发布日期:2022-10-20
通讯作者: *于天平,E-mail:2570441014@qq.com
作者简介:于天平(1986~ ),女,北京人,硕士,医师,研究方向:口腔颌面外科。

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

YU Tianping^*, WANG Rong, YANG Bin

Department of Stomatology, Shijingshan Teching Hospital of Capital Medical University, Beijing Shijingshan Hospital, Beijing 100040, China

Received:2022-03-22 Online:2022-10-28 Published:2022-10-20

摘要/Abstract

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。

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

Abstract: 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.

Key words: mandibular third molar, mesial impaction, mandibular second molar, ERR, CBCT

于天平, 王荣, 杨斌. 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[J]. 口腔医学研究, 2022, 38(10): 968-971.

YU Tianping, WANG Rong, YANG Bin. External Root Resorption of Second Molar Associated with Mesially Impacted Mandibular Third Molar Based on CBCT[J]. Journal of Oral Science Research, 2022, 38(10): 968-971.

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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

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