Malocclusions in Xia Dynasty in China  

作　　者：WANG Wei ZENG Xiang-long ZHANG Cheng-fei YANG Yan-qi 

机构地区：[1]Department of Orthodontics, Peking University School and Hospital of Stomatology, Beijing 100081, China [2]Comprehensive Dental Care, Endodontics, Faculty of Dentistry, the University of Hong Kong, Hong Kong, China [3]Orthodontics, Faculty of Dentistry, the University of Hong Kong, Hong Kong, China

出　　处：《Chinese Medical Journal》2012年第1期119-122,共4页中华医学杂志（英文版）

基　　金：This study was supported by a grant from National Natural Science Foundation of China （No. 30271429）. Er-li-tou Working Team under the Institute of Archeology of Chinese Academy of Social Sciences and the Research Center of Frontier Archeology of Jilin University provided the samples and materials used in this study.

摘　　要：Background The prevalence of malocclusion in modern population is higher than that in the excavated samples from the ancient times.Presently,the prevalence of juvenile malocclusion in the early stage of permanent teeth is as high as 72.92% in China.This study aimed to observe and evaluate the prevalence and severity of malocclusions in a sample of Xia Dynasty in China,and to compare these findings with the modern Chinese population.Methods The material consisted of 38 male and 18 female protohistoric skulls of Xia Dynasty 4000 years ago.Of 86 dental arches,29 cases had the jaw relationships.Tooth crowding,diastema,individual tooth malposition and malocclusion were studied.Results Of the samples,23.3% showed tooth alignment problems including crowding （8.1%）,diastema （9.3%）,and individual tooth malposition （5.8%）.The prevalence of malocclusion was 27.6%,mainly presented as Angle Class Ⅰ.Conclusions It is indicated that over thousands of years from Neolithic Age （6000-7000 years ago） to Xia Dynasty （4000 years ago）,the prevalence of malocclusion did not change significantly.The prevalence of malocclusion of Xia Dynasty samples was much lower than that of modern population.Background The prevalence of malocclusion in modern population is higher than that in the excavated samples from the ancient times.Presently,the prevalence of juvenile malocclusion in the early stage of permanent teeth is as high as 72.92% in China.This study aimed to observe and evaluate the prevalence and severity of malocclusions in a sample of Xia Dynasty in China,and to compare these findings with the modern Chinese population.Methods The material consisted of 38 male and 18 female protohistoric skulls of Xia Dynasty 4000 years ago.Of 86 dental arches,29 cases had the jaw relationships.Tooth crowding,diastema,individual tooth malposition and malocclusion were studied.Results Of the samples,23.3% showed tooth alignment problems including crowding （8.1%）,diastema （9.3%）,and individual tooth malposition （5.8%）.The prevalence of malocclusion was 27.6%,mainly presented as Angle Class Ⅰ.Conclusions It is indicated that over thousands of years from Neolithic Age （6000-7000 years ago） to Xia Dynasty （4000 years ago）,the prevalence of malocclusion did not change significantly.The prevalence of malocclusion of Xia Dynasty samples was much lower than that of modern population.

关 键 词：MALOCCLUSION Xia Dynasty skulls tooth crowding DIASTEMA individual tooth malposition 

分 类 号：P632.1[天文地球—地质矿产勘探] K878[天文地球—地质学]