Korean J Orthod.
1990 Jul;20(2):293-304.
A study on the morphologic differences between long-face adults and normal-face adults on the lateral and P-A cephalograms
- Affiliations
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- 1Department of Orthodontics, College of Dentistry, Yonsei University, Korea.
Abstract
- The purpose of this study was to describe the morphologic differences between long-face adults and normal-face adults on the lateral and P-A cephalograms. Long-face and normal-face subifects were selected clinically, and then each of them was taken the lateral cephalogram. According to SN-MP angle and ATFH on the lateral cephalogram, long-face group and normal-face group were classified. 2 long-face adults and 18 normal-face adults were collected, and each of them was taken the P-A cephalogram.
The results were as follows:
1. The morphologic differences between long-face adults and normal-face adults were closely related to mandibular morphology.
2. Long-face adults, compared with normal-face adults, demonstrated significant increase in ALFH, and significant decrease in ramus height.
3. Long-face adults, compared with normal-face adults, demonstrated significant increase in AUDH and, ALDH, especially in ALDH.
4. On the P-A cephalogram, no measures of transverse dimension demonstrated significant differences between two groups.
5. On the P-A cephalogram, facial height/facial width ratio was significantly larger than normal in the long-face adults, and in the normal-face adults, facial height/facial width ratio was approximately 90%.
6. In the correlation analysis of SN-MP angle and ATFH with all the other variables, the correlation coefficients of SN-MP angle and PTFH/ATFH that of ATFH and ALFH on the lateral cephalogram demonstrated the highest value, and on the P-A cephalogram, SN-MP angle and Cg-GA-Me (Lt.), ATFH and lower facial height demonstrated the highest value of correlation coefficients.