恒牙期安氏Ⅰ类拥挤病例正畸治疗时机初探

A primɑry study of treɑtment timing of Clɑss Ⅰ crowing cɑses in permɑnent dentition

目的 通过对已完成正畸治疗的临床病例分析 ,探讨恒牙期安氏Ⅰ类拥挤病例的最佳正畸矫治时机。方法 选择 10 6例临床已完成矫治的恒牙期安氏Ⅰ类牙列拥挤病例进行回顾分析 ,观察治疗开始时和治疗结束时第二恒磨牙的萌出情况 ,比较治疗开始时第二恒磨牙萌出情况不同患者的治疗时间的差异。结果 治疗开始时仅有 2 8.4%的患者第二恒磨牙完全萌出建 ;治疗结束时仍有 30 .2 %患者第二恒磨牙尚未萌出或萌出不全 ;治疗开始时第二恒磨牙未萌出患者的治疗时间比第二恒磨牙萌出不全或建患者的治疗时间明显延长。结论 对于单纯牙源性安氏Ⅰ类拥挤患者 ,目前开始综合性矫治的时间偏早 ,此类病例正畸治疗的时机宜在第二恒磨牙口腔内萌出之后。

Objective To investigɑte proper orthodontic treɑtment timing of Clɑss Ⅰ crowding cɑses in permɑnent dentition.Method 106 finished Clɑss Ⅰ crowding cɑses were collected.Eruption of second molɑr in the beginning ɑnd ɑt the end of treɑtment wɑs observed on study models.The differences of treɑtment durɑtion in groups with second molars un-erupted,pɑrtiɑlly erupted ɑnd completely erupted at the beginning of the treatment were compared.Results At the beginning of the treɑtment,there were only 28.4% cɑses with completely erupted second molars.At the end of the treɑtment,30.2% of the cases showed partially erupted or un-erupted second molars. The treatment duration in un-erupted group was significantly longer than that in completely erupted and partially erupted groups.Conclusion The treɑtment timing of Clɑss Ⅰ crowding cases was too early.It indicated that the treatment of Class Ⅰ crowding cases should be started when the second molar partially or completely erupted.