正畸关闭成人第一恒磨牙缺失间隙的临床疗效

目的研究正畸方法关闭成人第一恒磨牙早失或者拔除间隙的疗效及其影响因素。方法成人正畸患着19例，第一恒磨牙早失11颗（磨牙早失组），其中5颗第二恒磨牙治疗前存在附着丧失；第一恒磨牙严噩龋齿被拔除16颗（磨牙拔除组），其中5颗第二恒磨牙治疗前存在附着丧失。两组均应用直丝弓矫治技术，治疗前后拍摄全景片，治疗前后和关闭间隙前后检查第二恒磨牙牙龈指数和附着丧失，使用SPSS13．0软件进行双因素方差分析，因素1为治疗前第二恒磨牙有无附着丧失（有为牙用炎组，无为牙周健康组），因素2为第一恒磨牙缺失是由于拔除或早失。结果磨牙间隙完全关闭，牙龈指数较治疗前改善。磨牙早失组较磨牙拔除组的间隙关闭疗程长，第二恒磨牙附着丧失量较多；牙周炎组较健康牙周组疗程短（P〈0．05），第二恒磨牙附着丧失量更多。各因素对间隙关闭速度和治疗后第二恒磨牙附着丧失量的影响贡献从大到小为：治疗前第二恒磨牙附着匙失与否、磨牙早失或拔除、两者交互效应。结论通过正畸方法关闭成人第一恒磨牙缺失间隙，甚至骨缺损间隙足可行的．治疗前附着丧失的程度和牙周炎的易感程度是治疗效果的重要影响因素。

Clinical effects of orthodontic treatment for molar space closing in adults

Objective To demonstrate the effect of orthodontic treatment fi~r molar space closing in molar missing or molar extracted patients and its influential factors. Methods Nineteen adults with 11 molar missing and 16 molar extracted were treated by sliding mechanics. Panoramics were taken hefnre anti after treatment. Gingival index （ GI ） and attachment loss （AL） were recorded betbre treatment and ＇after space closing. Univariate analysis of variance was used in the analysis. Results All space were closed with fine GI. Compared with molar extraction group, molar missing group showed more treatment time and attachment loss. Co,npared with healthy gingival group, the periodontal group showed less treatment time and more attachment loss. The periodontal condition played the most important role in the orthodontic treatment for molar missing and molar extracted patients. Conclusion Patients with molar missing or molar extracted, even bone loss can be treated successfully through orthodontic treatment anti good oral hygiene education.