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A longitudinal study of mandible growth of Chinese adolescents with normal occlusion from 13 to 17 years of age

WT5”BX]ZHANG Xingzhong, LIN Jiuxiang, FU Minkui Department of Orthodontics, School of Stomatology, Beijing Medical University, Beijing 100081 [WT5”HZ]  
Objective [WT5”BZ]The purpose of this study was to determine the longitudinal growth changes of mandible from 13 to 17 years using conventional roentgenographic cephalometry.[WT5”HZ]Methods [WT5”BZ]The sample consisted of 22 females and 11 males with Class I dentitions, no history of orthodontic treatment, and good facial balance. All of the subjects had yearly cephalograms available.[WT5”HZ]Results [WT5”BZ]Results indicated that:1) From 13 to 17 years, The angle of mandible and the mandibular plane angle decreased 1.0 ~ 1.5 degrees and the mandible rotated upward and forward. All these changes showed no significant difference between males and females.2) Total mandibular length, mandibular base length, ramus height, chin thickness, and mandibular arch base length, grew much larger in male than in female with age.3) The mandible growth rate was found to be twice as for age 13 to 14 years in male as in female. The growth of mandibular length was lagged about 2 years in males than in females. No significant sexual differences were found from 16 years.[WT5”HZ]Conclusion [WT5”BZ]The present finding, e.g. the magnitude and direction changes of mandible, will help to make reasonable diagnosis and treatment planning. [WT5”HZ]
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