Tooth Size Arch Length Discrepancies and Cephalometric Analysis in Class 1 Malocclusion

作     者：A.MOHAMED YUNUS 

作者单位：重庆医科大学 

学位级别：硕士

导师姓名：Deng Feng（邓锋）

授予年度：2011年

学科分类：1003[医学-口腔医学] 100302[医学-口腔临床医学] 10[医学] 

主      题：Cephalometric Arch length Tooth size Bolton's analysis cast models 

摘      要：OBJECTIVE: The purpose of this study was to measure,analysis and compare the tooth size and arch length discrepancy of class 1 malocclusion as determined by bolton and carey for the chinese and indian （dravidian） ethnicity between the age group of 13 to 18 respectively. MATERIALS AND METHODS: In this materialistic study with theretrospective analysis, total of 80 patients cast ,40 cast （20 males and 20 females） of indian and （20 males and 20 females） of chinese were taken and measured the mesiodistal width of both upper and lower jaws and cephalometric analysis were done for the same , the indian record were taken at Department of orthodontics meenakshi ammal dental college chennai india and the chinese were taken in Department of orthodontics chongqing stomatology hospital affliated to chongqing medical university. Chongqing, China. RESULTS: In this nine parameters of cephalometric analysis seven parameters came out to be significant both in males and females namely SNB, SN-POg, MP-SN, Y-Axis, U1-L1, U1-SN and L1-MP. In respect to the comparison between Chinese and Indians, Chinese were found to be significant in all the parameters mentioned above. And in arch length tooth size analysis out of seven parameters four parameters proved to be significant MD width of mandibular teeth, overall ratio and Mandibular arch length were significant in Indian males over Chinese males but in females only MD width of mandibular teeth proved to be significant. CONCLUSION: Cepahlometric values are specific for each and every ethnic group. The normative data for Indian and Chinese population should be used as a guide for diagnosis and treatment plan for orthodontist in their country.