Correlation of alveolar bone structure and incisor labial inclination in adolescents with skeletal class II malocclusion of Uygur and Han populations in Xinjiang, China / 中国组织工程研究

ABSTRACT

BACKGROUND:Location relationship between maxilary incisor labial inclination and the thickness of anterior alveolar bone displays ethnic and regional differences. OBJECTIVE:To study the correlation of alveolar bone structure and incisor labial inclinationin adolescents with skeletal class II malocclusion in Uygur and Han populations of Xinjiang, China. METHODS:Sixty Uygur and 60 Han patients at 11-16 years of age (average 13.8 years old), 32 males and 28 females, with skeletal class II malocclusion wereincluded. The thickness of anterior alveolar bone and incisor labial inclination were measuredon lateralcephalometric films, and the results were analyzed using SPSS 17.0 statistical software. RESULTS AND CONCLUSION:In Han and Uygur populations, palatalalveolar bone thicknessin maxilary incisor regionwas significantly negatively correlated with the inclination of maxilary incisor (r=-0.715 for Han,r=-0.651 for Uygur,P< 0.05), while labial alveolar bone thicknessin mandibular incisor regionwas significantly positively correlated with the lower incisor inclination (r=0.902 for Han,r=0.745 for Uygur,P< 0.05). These results indicate thatthepalatal alveolar bone thicknessin maxilary incisor region decreases with the increase of the inclinationof maxilary incisor; however,thelabial alveolar bone thicknessin mandibular incisor regionincreases with the increase of the lower incisor inclination.