青少年期不同垂直骨面型安氏Ⅱ^1类错牙合颌面骨骼宽度分析

Analysis of dentofacial width of classⅡ1 malocclusion with different vertical skeletal types of adolescents

目的探讨青少年期不同垂直骨面型与安氏Ⅱ1类错牙合畸形颌面骨骼宽度的相关性。方法搜集13~17岁安氏Ⅰ类均角病例20例(对照组)和安氏Ⅱ1类病例120例(试验组)为研究对象,试验组分为上颌发育过度组(试验一组)和下颌发育不足组(试验二组),每组60例,其中每组又分为均角组、高角组和低角组,每组20例。在头颅后前位片上分别测量面中份宽度(inter-zygomatics width,Zyg-Zyg′)、下颌总宽度(inter-condyles width,Cdl-Cdl′)、鼻宽度(inter-nasal cavities width,Nc-Nc′)、上颌宽度(inter-maxillary points width,Mx-Mx′)、上颌后段牙弓宽度(upper inter-molars width,UM-UM′)、下颌后段牙弓宽度(lower inter-molars width,LM-LM′)、下颌体宽度(inter-gonions width,Go-Go′)。结果均角一组、均角二组的指标UM-UM′小于对照组(P<0.05);高角一组、高角二组的指标UM-UM′、Mx-Mx′小于对照组(P<0.05);高角一组的指标UM-UM′小于低角一组(P<0.05),其中UM-UM′与FH-MP呈负相关(r=-0.425,P<0.05);高角二组的指标UM-UM′小于低角二组和均角二组(P<0.05),其中UM-UM′与FH-MP呈负相关(r=-0.533,P<0.05)。结论安氏Ⅱ1类错牙合畸形病例上颌后段牙弓宽度随下颌平面角的增加逐渐减小。

Objective To investigate the correlation between different vertical facial patterns and maxillofacial bone width of angle classⅡ1 malocclusion.Methods Twenty average-angel patients with classⅠmalocclusion(the controlled group)and 120 patients with classⅡ1 malocclusion(the test group)were collected.Patients with classⅡ1 were divided into two groups according to the cause of malocclusion.The first test group was maxilla overgrown group,and the second test group was mandible dysplasia group.There were 60 patients in each group.Each group was divided into average-angle group,high-angle group and low-angle group with 20 cases in each group.Inter-zygomatics width(Zyg-Zyg′),inter-condyles width(Cdl-Cdl′),inter-nasal cavities width(Nc-Nc′),inter-maxillary points width(Mx-Mx′),upper inter-molars width(UM-UM′),lower inter-molars width(LM-LM′)and inter-gonions width(Go-Go′)were measured respectively in the posteroanterior cephalograms.Results The first and second test groups with average-angel were smaller than the control group in UM-UM′(P<0.05).The first and second test groups with high-angel were smaller than the control group in UM-UM′and Mx-Mx′(P<0.05).The first test groups with high-angle group was smaller than the low-angle group in UM-UM′(P<0.05),UM-UM′of the first test group was negatively correlated with FH-MP(r=-0.425,P<0.05).The second test groups with high-angle group was smaller than the low-angle group and average-angel group in UM-UM′(P<0.05),UM-UM′of the second test group was negatively correlated with FH-MP(r=-0.533,P<0.05).Conclusion As the mandibular plane angle decrease from large to small,the maxilla posterior arch width in patients with classⅡ1 malocclusion gradually increase.