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《Journal of Clinical Stomatology》 2014-01
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Mandibular growth rotation in untreated Class Ⅲ malocclusion

XIE Kui;HUI Wen-ting;PEI Jin-ying;WANG Li-ying;LIU Jia;JIN Zuo-lin;Department of Orthodontics,School of Stomatology,Fourth Military Medical University;Department of Stomatology,Xidian Group Hospital;  
Objective:A cross-sectional study was designed to investigate the characteristics of mandibular rotation in untreated patients with Class Ⅲ malocclusion. Method:The sample consists of 329 subjects(144 males,185 females) with Class Ⅲ malocclusion, who were divided into six consecutive developmental periods(from CS1 to CS6 according to cervical vertebral maturation method(CVM). Their cephalograms were measured by Winceph8.0 software,which include Gonion Angle(ArGo'Me),Occlusal plane Angle(Occlusal pl. To SN),Mandibular plane Angle(Go Gn to SN) and ratio(S-Go/N-Me) value; The data were analyzed by SPSS16.0. Result:For male,SN-OP displayed a ascending firstly and descending lately trend,the peak in CS3,and exhibited statistically significant increases between CS3 and CS6. In the transitions from CS4 to CS6,Ar-Go'Me decreased,and S-Go/N-Me increased gradually;in addition,both the measures showed statistical significance between CS4 and CS6((P value 0.041and 0.009,respectively). In female,SN-OP,SN- GoGn and ArGo'Me showed statistically significant decreases from CS4 to CS5(P ﹤ 0.05),meanwhile,S-Go/N-Me exhibited statistically stgnificantce accordingly(P = 0.006). Conclusion:The results suggested that Mandibular growth showed a trend of upward and forward rotation generally, and their rotation was the most apparent from CS4 to CS6. This study indicated that mandibular growth rotation after the growth spurt should be considered,when orthodontists take out therapy plans for patients with Class Ⅲ malocclusion.
【Fund】: 陕西省科技攻关计划项目(2012K16-10-05)
【CateGory Index】: R783
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