双生儿牙齿冠宽咬合特征遗传变异研究

Study of genetic variation of occlusive features of dimension of teeth coronae in twins

对居住北京城区54对平均年龄21.3岁的同性别双生儿恒牙列牙齿冠宽、前牙覆、覆盖、第一恒磨牙关系进行测量,结果:同卵组与异卵组牙齿冠宽的对内之差、各牙齿的分散度和遗传度,均与遗传因素明显相关。同卵组双生儿的牙齿宽度无显著差异,异卵组双生儿的对内之差差异显著;各牙齿冠宽差异的分散度较大。但同卵组、异卵组前牙覆、覆盖、第一恒磨牙关系的一致率无显著性差异,表明咬合特征的形成受环境因素影响较大。

The dimension of teeth coronae,overbite and overlay of labial teeth in permanent dentition,and occlusal relation of first permanent molar teeth were measured in the same sex twins residing in Beijing at average age 21. 3. The results showed that,in the monozygotic group and dizygotic group, the difference of teeth coronae dimension, dispersity and heritabtlity of every tooth in twins all had effected by heriditation,and that the teeth coronae dimension had no difference in monozygotic group and that the dispersity degree of difference of teeth coronae dimension had significantly difference each other. The uniformity rate of labial teeth overbite,overlay and jaw relation of first permanent molar teeth had no difference in the two groups. It is suggested that the formation future of occlusion is effected mainly by environment factors.