安格尔Ⅱ类1分类错畸形临界病例拔牙与否的正畸治疗效果评估

An evaluation of premolar extraction and non-extraction treatment outcome on borderline cases with Angle class Ⅱ division 1 malocclusion

目的通过对安格尔Ⅱ类1分类错临界病例正畸前后的牙模型同行评估等级(PAR)指数分析,评估这类患儿拔牙与否的正畸治疗效果,为临床医师制定矫治计划提供参考。方法选择83例平均年龄(12.6±1.1)岁的安格尔Ⅱ类1分类错临界病例为研究对象,其中拔牙57例,非拔牙26例,应用PAR指数对其治疗前后的牙模型进行评分,比较拔牙组与非拔牙组矫治前后错的分值变化,进而评估两组正畸治疗的效果。结果安格尔Ⅱ类1分类错临界病例不论拔牙与否,治疗后的加权PAR指数总分均较治疗前明显减小,加权PAR指数减少率均大于70%,且两组之间的加权PAR指数总分差异无统计学意义;治疗效果明显改善者为96.39%(80/83)。结论安格尔Ⅱ类1分类错临界病例拔牙与否,均可在牙关系方面收到较好的治疗效果。

Objective This retrospective study was designed to evaluate the clinical treatment outcomes of bor-derline cases with Angle class Ⅱ division 1 malocclusion by using peer assessment rating （PAR） index to assess the ocelusal traits of pre- and post-treatment models. Methods The subject of this study consisted of borderline patients with Angle class Ⅱ division 1 malocclusion, including 83 children （26 patients with extraction and 57 patients without extraction）. PAR index was used to assess the occlusal traits of dental models before and after orthodontic treatment to evaluate the clinical treatment outcomes of these two groups. Results In borderline cases with Angle class Ⅱ division 1 malocclusion, regardless of extraction or not, the weighted PAR index was decreased after treatment, the percentage reduction in weighted PAR index was more than 70%, and no significant difference exists between extraction and non-extraction group. In the evaluation of orthodontic treatment outcome, 96.39% （80/ 83） of cases improved. Conclusion Borderline cases with Angle class Ⅱ division 1 malocclusion in children no matter extraction or non-extraction, both can achieve good outcomes in occlusion after treatment.