直立阻生下颌第三磨牙关闭缺失第一恒磨牙间隙的临床研究

Research on clinical effects of uprighting impacted molars and closing the missing molar space

目的:研究正畸方法直立阻生磨牙后前移关闭缺失第一恒磨牙间隙的疗效。方法:样本共计32例,下颌第一恒磨牙已拔除或无保留价值,且伴同侧下颌第三磨牙阻生。口内辅弓法直立阻生磨牙,直丝弓矫治技术关闭下颌第一磨牙间隙。治疗前后检查第二恒磨牙和第三恒磨牙附着丧失(Attachment Loss AL),统计使用SPSS 13.0统计学软件包,分析采用非参数检验附着丧失的变化。结果:32例阻生齿均直立,下颌第一恒磨牙缺隙关闭。X线片检查示:牙根平行良好,阻生齿周围骨质再生良好,牙槽嵴形态正常,牙周膜清晰。所有病例均取得满意的疗效。治疗后较治疗前出现少量附着丧失量增加,差异具有显著性(P<0.05)。结论:下颌第一磨牙缺失后可通过正畸治疗移动第二磨牙且直立前倾阻生第三磨牙前移代替原第一、二磨牙,疗效较好,可见少量附着丧失,建议治疗前评估患者附着龈水平和牙周状况,降低治疗风险。

Objective To demonstrate the orthodontic effects of uprighting the impacted molars and closing the space of missing first molars. Methods 32 cases were selected with missing mandibular first molar and impacted mandibular third molars.The impacted molars were uprighted by auxiliary light wire and coiling spring.Straight wire appliance was used to close the space of missing first molar. Attachment Ioss（AL）were recorded before and after treatment.The data were analyzed by SPSS Statistical Package. Results All cases were uprighted with space closed.Attachment loss was found with significant differences（P〈0.05）. Conclusion The results showed that the method was practical and reliable for correcting impacted mandibular molars.Attachment loss was detected in some patients. Evaluation of condition of attachment gingival and oral hygiene before treatment is suggested.