| Objective:To study the characteristics of anterior crown-root ratio in different craniofacial occlusal population of Uyghur and Han.Methods:A total of 236 patients with CBCT images meeting the inclusion criteria were selected and divided into 7 groups according to the ANB angle of sagittal bone plane,and MP-FH angle of vertical bone plane.Group 1:skeletal class I(Han 30 cases,Uyghur 30 cases),Group 2:skeletal class II~1(Han 30 cases,Uyghur 30 cases),Group 3:skeletal classⅡ~2(Han 30 cases,Uyghur 28cases),Group 4:skeletal classⅢ(Han 30 cases,Uyghur 28 cases),Group 5:High angle(Han 30 cases,Uyghur 24 cases),Group 6:Average angle(Han 35 cases,Uyghur 28cases),Group 7:Low angle(Han 26 cases,Uyghur 22 cases).Results:(1)In the group of sagittal bone plane type,both in Uyghur and Han nationality,the crown-root ratio of upper and lower anterior teeth in skeletal classⅢwas higher than that in skeletal classⅠandⅡ~1,the crown-root ratio of upper anterior teeth in skeletal classⅡ~2 was higher than that in skeletal classⅡ~1,and the crown-root ratio of upper incisor teeth in skeletal classⅡ~2was higher than that in skeletal classⅠ(P<0.05).In the vertical bone plane group,in the Han population,the crown-root ratio of upper and lower central incisor in the low angle group was higher than that in the average angle group and high angle group(P<0.05).In the Uyghur population,the crown-root ratio of upper and lower lateral incisor in the low angle group was lower than that in the high angle group(P<0.05).(2)Under the same skeletal type,the length of crown and root and crown-root ratio of anterior teeth in Han and Uyghur population were statistically different in some teeth(P<0.05).Conclusions:(1)In different craniofacial occlusion types,the crown-root ratio of upper and lower anterior teeth are different in Uyghur and Han population.(2)Race is an important factor affecting the length of crown and root and crown-root ratio of anterior teeth. |
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