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Changes of Ca/P ratio in alveolar bone during orthodontic treatment in rats
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 9
- DOI:
- 10.3321/j.issn:1000-2790.2003.09.005
- Key Word:
- 正畸学;牙槽骨;Ca/P比值;X射线微区分析法
Abstract： 目的: 通过在大鼠上颌第一磨牙施加正畸力,研究加力后不同时期牙槽骨局部Ca/P比值的动态变化,以期从元素变化的角度揭示正畸牙齿移动的规律. 方法: 利用X射线能量衍射微区分析法,改进的冷冻断裂技术和峰背比计量技术,进行大鼠上颌第一磨牙局部牙槽骨中Ca、P元素含量28 d内动态检测. 结果: 加力后7 d,大鼠牙槽骨标本张力侧Ca/P比值从(2.43±0.61)降至(0.86±0.10),压力侧Ca/P比值从(2.58±0.77)降至(0.88±0.06);尔后张力侧Ca/P比值逐渐升高,到28 d已升至(1.88±0.25);压力侧于加力后14 d Ca/P比值为(0.80±0.13),显著低于张力侧同期水平(P<0.01),然后逐渐升高,到28 d升至(1.79±0.30). 结论: 加力后局部牙槽骨的改建呈现出动态变化的过程. 张力侧及压力侧,其Ca/P比值分别发生变化,并在1 mo左右趋向于新的动态平衡.
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