影响正畸前后下颌第三磨牙角度改变的多因素分析被引量：10

The factors affecting mandibular third molar angulation during orthodontic treatment

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摘要目的:研究成人患者正畸前后下颌第三磨牙萌出角度改变的影响因素。方法:选取正畸治疗结束的成人患者80名,共有下颌第三磨牙(简称M3)154颗。记录患者的性别、年龄、临床分类及正畸治疗方法。对其术前术后的曲面断层片测量下颌M3角度及萌出间隙,并判断术前下颌M3的牙根发育状态。采用协方差分析的多因素分析方法探讨各因素对正畸前后下颌M3角度改变的影响。结果:多因素分析显示矢状骨型、治疗前下颌M3牙根发育状况、治疗前下颌M3角度、治疗前及治疗后的下颌M3间隙/宽度比值与正畸前后下颌M3的角度改变有关。矢状I类骨型、治疗前下颌M3牙根处于发育完成但根尖孔未闭和发育不足1/3状态、治疗前下颌M3角度<30°和>60°,治疗前、后下颌M3间隙/宽度比值越大,正畸前后下颌M3的角度改善越明显。结论:对于成人正畸患者来说,影响正畸前后下颌M3角度改变的因素为多方面的,正畸治疗并非直接的影响因素。 Objective：To analyze the factors which affect mandibular third molar angulation changes during treatment of adult orthodontic patients.Methods：80 post-treatment adult patients including 154 mandibular third molars（M3） were selected.The gender,age,clinical classification and treatment methods of the patients were recorded.The pretreatment and post-treatment panoramic radiographs were analyzed.The angulation and the eruption space of mandibular M3 were measured.The root development stages of the mandibular M3 before treatment were evaluated.The factors affecting mandiular M3 angulation changes were analysed by covariance analysis.Results：The results of multi-factors analysis illustrated that the sagittal skeletal classifications,the root development stages of the pre-treatment mandibular M3,the pre-treatment mandibular M3 angulations,the width/space ratios before and after treatment affected the mandibular M3 angulation changes during the orthodontic treatment.Mandibular M3 showed more improvement in angulation in groups of Class I sagittal skeletal classification,the root development stages of the pre-treatment mandibular M3 where the root was fully formed but the foramen apices wasn＇t closed or the stages where the root less 1/3 was formed,the pre-treatment mandibular M3 angulations 〈30°or 〉60°,and the more M3 space before and after treatment,the more improvement in M3 angulation.Conclusion：In adult orthodontic patients,the mandibular M3 angulation changes during the treatment can be influenced by many factors,but orthodontic treatment is not the direct factor.

作者马宁

机构地区北京大学第三医院口腔科

出处《实用口腔医学杂志》 CAS CSCD 北大核心 2009年第5期728-732,共5页 Journal of Practical Stomatology

关键词角度改变下颌第三磨牙多因素分析正畸治疗 Angulation changes Mandibular third molar Multifactorial analysis Orthodontic treatment

分类号 R783.5 [医药卫生—口腔医学]

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参考文献13

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