错畸形上下牙量的测量分析

目的:探讨安氏Ⅰ、Ⅱ、Ⅲ类错牙合畸形病例上下颌牙量不调的发生率,为临床正畸治疗提供指导。方法:随机选择 325例安氏错牙合畸形患者牙模型,分别测量上、下颌全牙量和前牙量,计算Bolton值及Bolton不调的发生率。结果:安氏Ⅰ类和安氏Ⅲ类前牙均大于安氏Ⅱ类,而全牙Bolton值及Bolton不调发生率则为Ⅰ类 >Ⅱ类 >Ⅲ类(P<0. 05)。结论:Bolton指数在各类错牙合畸形中存在差异,正畸治疗前须进行Bolton分析。

Bolton Analysis of Different Malocclusion

Objective To investigate the incidence of Bolton ratios in different malocclusion groups. Method The mesiodistal width of six anterior teeth and twelve teeth size were assessed in 325 patients who were selected randomly. These dental casts were divided into three groups according to angle classification .Bolton ratios and the incidence of Bolton tooth size discrepancies were calculated and statistical differences were estimated. Result Bolton anterior and overall ratios of Class Ⅲ and Class Ⅰ were more than that of Class Ⅱ respectively. While Bolton anterior and overall tooth size discrepancies showed Class Ⅰ> ClassⅡ>Class Ⅲ(P<0.05). Conclusion Significant difference can be found in both Bolton index and the incidence of Bolton tooth size discrepancies in different malocclusion groups.It suggests that the Bolton analysis should be carried out before treatment.