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Longitudinal changes of crown inclination in juveniles with normal occlusion
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- Author:
- No author available
- Journal Title:
- CHINESE JOURNAL OF STOMATOLOGY
- Issue:
- 8
- DOI:
- 10.3760/j.issn:1002-0098.2007.08.006
- Key Word:
- 纵向研究;转矩;牙;正常(牙合)
Abstract： 目的 研究正常(牙合)青少年从替牙期到恒牙初期切牙和第一恒磨牙转矩度的生长变化,为正畸诊断、治疗方案设计提供依据.方法 对北京大学口腔医学院·口腔医院颅面生长发育中心收集的20名正常(牙合)青少年样本(男性6名,女性14名)替牙期和恒牙初期的牙颌模型进行分析:替牙期:第一恒磨牙及4颗恒切牙萌出至(牙合)平面,研究对象平均(9.5±0.9)岁;恒牙初期:除第三磨牙外其他恒牙均萌出至(牙合)平面,研究对象平均(13.7±1.3)岁.使用Biaggini Rayset系统测量切牙和第一恒磨牙的转矩度,分析替牙过程中牙冠倾斜度的变化.结果 替牙期与恒牙初期相比,男、女切牙和磨牙的转矩度差异均无统计学意义(P＞0.05).替牙期至恒牙初期,上颌中切牙转矩度由14°减小为10.9°(P＜0.001);下颌中切牙转矩度由1.8°增加为5.2°(P＜0.01);上颌侧切牙转距度的变化无统计学意义(P＞0.05);下颌侧切牙转矩度由1.2°增加为3.0°(P＜0.05).上颌第一恒磨牙转矩度由-6.6°减小为-10.3°(P＜0.001).下颌第一恒磨牙转矩度由-38.6°增加为-33.2°(P＜0.001).结论 从替牙期到恒牙初期,上颌第一恒磨牙逐渐舌向直立,下颌第一恒磨牙逐渐颊向直立.
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