138例恒牙列初期骨性Ⅲ类错唇形的研究

The analysis of 138 cases of lip contour of class Ⅲ malocclusion in early permanent dentition

目的研究性别、生长型与骨性Ⅲ类错患者侧位唇形的关系。方法 选取138例恒牙列初期骨性Ⅲ类错患者的头颅侧位片,测量唇部矢状向及垂直向伸展度。结果 恒牙列初期骨性Ⅲ类错患者中,男性唇矢状向及垂直向伸展度均大于女性,但差异无统计学意义(P>0.05)。生长型对骨性Ⅲ类错患者唇形影响表现为:水平生长型相对平均生长型和垂直生长型患者的上下唇较短、较厚且外翻明显。垂直生长型患者相对平均生长型和水平生长型患者的上下唇较长、较薄但无明显外翻。结论 性别及生长型与恒牙列初期骨性Ⅲ类错患者的唇侧位形态有一定关系。

Objective To study the influence of different gender and growth pattern on the lip contour of Class Ⅲ malocclusion in early permanent dentition.Methods 138 patients with Class Ⅲ malocclusion were selected.Their pre-treatment cephalometric X-rays were measured to analyze the lip contour.Results 1）The lip sagittal and vertical extension values of male were larger than female,but no significant difference was observed（P0.05）.2）The patients of horizontal growth pattern had shorter 、thicker and more obviously everted lips than other patterns.Patients of vertical growth pattern had longer and thinner lips than horizontal and average growth patterns.Conclusion Gender and growth pattern both have influences on the lip contour of Class Ⅲ malocclusion in early permanent dentition.