青少年正畸患者下颌第三磨牙萌出的影响因素研究  

Factors affecting the eruption status of mandibular third molars in adolescent orthodontic patients

作　　者：黄虹 李媛 景秋平[1,2,3] 石逸瑾 阳胜军 王东苗 HUANG Hong;LI Yuan;JING Qiuping;SHI Yijin;YANG Shengjun;WANG Dongmiao(Department of Oral and Maxillofacial Surgery,The Affiliated Stomatological Hospital of Nanjing Medical University,Nanjing 210029,China)

机构地区：[1]南京医科大学附属口腔医院口腔颌面外科,江苏南京210029 [2]南京医科大学口腔疾病研究江苏省重点实验室,江苏南京210029 [3]江苏省口腔转化医学工程研究中心,江苏南京210029 [4]南京医科大学附属口腔医院口腔正畸科,江苏南京210029

出　　处：《口腔医学》2023年第8期697-701,共5页Stomatology

基　　金：国家自然科学基金(82273446);江苏省卫健委科研项目(M2020021);江苏省科教能力提升工程——江苏省研究型医院(YJXYYJSDW4);江苏省医学创新中心(CXZX202227)。

摘　　要：目的分析青少年正畸患者下颌第三磨牙萌出的影响因素。方法选取初次就诊时下颌第三磨牙阻生的青少年正畸患者。记录患者性别、安氏分类、下颌第三磨牙发育程度、减数拔牙,通过软件生成的侧位片测量下颌第三磨牙轴倾角度(8-SN)、下颌第二、第三磨牙之间的夹角(7-8axis)、下颌第三磨牙萌出间隙(7D-ABR)以及下颌第三磨牙的萌出高度(8-OP)。根据第二次拍摄CBCT时第三磨牙阻生程度将病例分为萌出组和未萌出组。采用Logistic回归分析下颌第三磨牙萌出的影响因素。结果由Logistic回归分析得出,安氏Ⅰ类错[牙合]、减数拔牙、下颌第三磨牙牙根形成、正畸治疗前下颌第三磨牙长轴与前颅底平面的夹角越大,下颌第二磨牙长轴与第三磨牙的夹角越小,更有利于下颌第三磨牙的萌出。结论青少年患者正畸治疗后下颌第三磨牙的萌出受减数拔牙、下颌第三磨牙发育程度、安氏分类、8-OP、7-8axis、8axis-SN等多方面因素的影响。Objective To delineate and analyze the factors affecting the eruption of mandibular third molars in adolescent orthodontic patients.Methods Adolescent orthodontic patients with impacted mandibular third molars at their first visit were retrospectively screened.The record of gender,Angle Classification,development of mandibular third molar,tooth extraction,the angle of mandibular third molar inclination(8⁃SN),the angle between mandibular second and third molars(7⁃8axis),the eruption space of mandibular third molars(7D⁃ABR)and the eruption height of mandibular third molars(8⁃OP)were measured by software⁃generated lateral cepha⁃lometric radiographs.The cohort were classified into eruption group and un⁃eruption group according to the degree of impaction of the third molar during the second CBCT image.Logistic regression analysis was utilized to analyze the factors affecting the eruption status of mandibular third molars.Results Among the factors,Angle ClassⅠmalocclusion,tooth extraction,the root formation of mandibu⁃larthirdmolars,a larger angle between the long axis of the third molar and the anterior skull base plane,and a smaller angle between the long axis of the second molar and the third molar were conducive to the eruption of mandibular third molars.Conclusion The e⁃ruption status of mandibular third molars after orthodontic treatment is influenced by several factors,including orthodontic extraction,development of mandibular third molars,Angle's classification,8⁃OP,7⁃8 axis,and 8axis⁃SN.

关 键 词：下颌第三磨牙 萌出 正畸治疗 

分 类 号：R782.1[医药卫生—口腔医学]