13名女性自9.5至15.5岁自然生长中下颌骨旋转的研究

Study on mandibular rotation in 13 female subjects aged from 9.5 to 15.5

目的通过对13名未经正畸治疗的女性个体自9.5至15.5岁拍摄头颅侧位片的重叠研究,探讨面部正常生长发育过程中下颌骨的旋转。方法选择美国密西根大学生长发育中心收集的Dr.Mathews长期追踪观察的13名未经正畸治疗的安氏Ⅰ类高加索人种女性9.5～15.5岁拍摄的头颅侧位片,以种植体作为标志点,重叠并描记所有头颅侧位片。通过Dentofacial Software完成头影测量分析,采用SPSS 15.0软件对不同年龄段的面部生长变化进行配对t检验。结果高加索人种女性9.5～11.5岁时前下面高、后面高、下颌升支和下颌种植体平面角的变化有统计学差异;11.5～13.5岁时前下面高、后面高、下颌升支的变化有统计学差异;13.5～15.5岁时后面高、下颌平面角、下颌种植体平面角的变化有统计学差异。结论生长发育过程中下颌骨下缘的改建会引起下颌骨的整体旋转。

Objective To evaluate the mandibular rotation in females aged from 9.5 to 15.5 years. Methods The sample was obtained from Mathews＇s implant study with longitudinal cephalometric records of 13 untreated Caucasian female subjects. The cephalograms taken annually from 9.5 to 15.5 years old were traced and analyzed with Dentofacial Software. Paired-t test was performed to identify the significant growth changes in different age groups. Results Significant change in lower anterior facial height, posterior facial height, ramus length and mandibular implant plane angle were noted in aged 9.5-11.5. Significant change in lower anterior facial height, posterior facial height and ramus length were noted in aged 11.5-13.5. Significant change in mandibular plane angle and mandibular implant plane angle and significant increase in posterior facial height were observed in aged 13.5-15.5. Conclusion The resuits of this study verify that remodeling on the lower border of mandible influences total mandibular rotation.