[Coben cephalmetric analysis of the 120 Haerbin persons with normal occlusion]

To obtain the normal value of Coben analysis for Haerbin with normal occlusion and analyze the different features of cranio-maxilla-facial structure between male and female, between adults and children.

120 Haerbin subjects (60 adults and 60 children) who fulfilled specific normal occlusion were seleceted from primary schools and universities students of Haerbin. They were divided into comparison groups on the basis of age and sex. Lateral cephalograms were taken for all subjects, and the mean and standard deviation for each parameter was recorded and compared between groups. Paired t test was used to assess statistical significance.

In depth, both sexes exhibited great increment in the middle and lower face. In anterior and posterior face height, the male adults exhibited increment, and in female adults only the posterior face height exhibited increment. The male adults face far exceeded the female in vertical growth, and less than the female in horizontal growth. No statistically significant differences of facial form were found between the sexes in children.

The normal values of Coben analysis for Haerbin with normal occlusion was established. There were significant differences in normal values of Coben analysis between male and female, between adults and children.