安氏Ⅱ类错牙合牙量不调的对比研究

Comparison of the tooth size discrepancies between ClassⅡ~1 andⅡ~2 malocclusion

目的:探讨安氏Ⅱ类错牙合中两亚类错牙合畸形在牙牙合特征方面的差异。方法:选择安氏Ⅱ1、Ⅱ2类错牙合患者各120例,分别测量并比较两亚类错牙合的前、全牙冠宽度及Bolton指数。结果:1在安氏Ⅱ1、Ⅱ2类错牙合患者中,男性前牙冠宽度之和及全牙列牙冠宽度之和在两类错牙合之间无显著性差异(P>0.05),而在女性中则差异显著(P<0.05);2同种类型错牙合不同性别间及合并男女后比较安氏Ⅱ1、Ⅱ2类错牙合,前牙比及全牙比的Bolton指数均无显著性差异(P>0.05)。结论:上下颌牙量不调是造成安氏Ⅱ类错牙合深覆盖、深覆牙合的因素之一。

AIM： To compare of the tooth size discrepancies between Class Ⅱ1and Ⅱ2malocclusion.METHODS： 120 casts of ClassⅡdivision 1 and Class II division 2 malocclusion were included. Mesio-distal width of the teeth was measured and Bolton Index was calculated. Statistical analysis was made between the 2 groups.RESULTS： 1. The sum of anterior tooth width and the sum of total dentition width were not significantly differenct between the 2 groups（ P〈0. 05） of in the male,but were significantly different in the females（ P〈0. 05）. 2. There was no significant difference of the Bolton index between the two groups（ P〈0. 05）. CONCLUSION： Tooth size discrepencie in maxillary and mandibular can be one of the factors resulting in deep overbite and overjet of Class II malocclusion.