恒牙初期Ⅱ类1分类错患者唇形的研究

The analysis of lip contour of Class Ⅱ division 1 malocclusion in the early permanent dentition

目的通过对Ⅱ类1分类错患者唇侧位形态的研究,分析不同生长型和性别对唇侧位形态的影响。方法选取145例恒牙初期Ⅱ类1分类错患者为研究对象,在其正畸治疗前拍摄的头颅定位侧位片上测量上下唇侧面的长度和厚度,分别采用t检验和单因素方差分析比较不同性别和不同生长型患者唇形态的差异。结果恒牙初期Ⅱ类1分类错患者中,男性的上下唇长度均大于女性(P<0.05),男性上下唇的厚度与女性的差异无统计学意义(P>0.05);不同生长型患者的上唇侧位形态无明显差异,而水平生长型患者的下唇外翻较垂直生长型患者更明显。结论性别及生长型对恒牙初期Ⅱ类1分类错患者的唇侧位形态有影响。

Objective To study the lip contour of Class Ⅱ division 1 malocclusion in the early permanent dentition with different growth patterns and gender.Methods 145 patients with Class Ⅱ division 1 malocclusion in the early permanent dentition were included in this study.Their pre-treatment cephalometric X-rays were measured to analyze the influence of gender and growth pattern on the lateral lip contour.One-way analysis of variance was used to analyze the influence of growth pattern on the lip contour of patients in the early permanent dentition,and t-test was used to analyze the influence of gender on the lip contour of patients.Results The lip vertical extension values of male patients were larger than that of female（P0.05）;the lip sagittal extension value of male seems to be larger too,but no significant difference was found（P0.05）.The upper lip extension patterns of patients with different growth patterns were the same,but patients of horizontal growth pattern had more everted and protrusive lower lips than patients of vertical growth pattern.Conclusion Gender and growth pattern both have influences on the lip con-tour of Class Ⅱ division 1 malocclusion in the early permanent dentition.