The preliminary study on creating the differential templates of the skeletal profiles for Shanghainese with normal occlusion in early permanent dentition
Chen, L.; Peng, S.; Cao, H.; Liu, H.; Li, G.
Zhonghua Kou Qiang Yi Xue Za Zhi 37(2): 142-144
2002
ISSN/ISBN: 1002-0098 PMID: 12475431 Document Number: 544583
To establish the differential templates of the skeletal profiles for Shanghainese with normal occlusion in early permanent dentition. 71 lateral cephalometric radiographs of subjects with normal occlusion in early permanent dentition, aged from 11 - 15 years (37 females and 34 males) were traced. 23 skeletal landmarks were identified on the tracings, which afterwards were scanned on the computer. An x-y coordinate system was established: the tracing superimposed on sella rotated 7 degrees down from the sella-nasion line as the x axis and the vertical line through sella perpendicular to the x axis as the y axis. A special length/depth ratio was designed. The length/depth ratio of each graph were calculated. Steiner analysis was applied to check the difference between genders. There was no difference between genders. The tracings were divided into three categories: short face, normal face and long face according to the mean and standard deviation of the ratio. The three types of tracings were superimposed on the x axis with sella registered. Three templates were created. The differences were apparent when the three templates were superimposed.