Abstract:
This research was performed to detect the correlation between the atlas arch height and vertical craniofacial pattern and predict vertical craniofacial pattern from the atlas arch height in Thai. By purposive sampling from the patients who were seeking treatment in orthodontic department of Chulalongkorn University, 180 samples consisting 90 males and 90 females, at the age of 15-25 years were selected. Each gender group comprised 30 open bite, 30 normal bite and 30 deep bite. All lateral cephalometric films were traced and measured the angle of SN-GoGn, FMA, Y axis-FH, the distance of Ar-Go, the ratio of SGo/NMe (%), the atlas anterior arch height and the atlas posterior arch height. It was found that both atlas anterior arch height and atlas posterior arch height showed significant difference between male and female by using t-test (p<0.01). The result of this study revealed that both atlas anterior arch height and atlas posterior arch height not only showed negative correlations with the angle of SN-GoGn and FMA but also showed positive correlations with the distance of Ar-Go and the ratio of SGo/NMe (%). The angle of Y axis-FH showed negative correlations with the atlas posterior arch height, while there was no correlation with the atlas anterior arch height. By Stepwise regression analysis, the result showed that the atlas posterior arch height could be used to predict vertical craniofacial pattern. The ratio of SGo/NMe (%) was the best variable to be predict in both sex, while the angle of SN-GoGn, FMA in female and the angle of SN-GoGn in male were the better variable to be used