Näsström K, Odselius R, Petersson A
Dept of Oral Radiology, Lund University, Malmö, Sweden.
Scanning Microsc. 1996;10(2):339-46; discussion 346-7.
The aim of this study was to investigate whether the calcium (Ca) and phosphorus (P) composition of corticosteroid induced dentin was the same as in normally developed dentin. Seven rats were given corticosteroids intravenously and three rats served as controls. Energy dispersive X-ray microanalysis (EDX) was carried out on the axially sawn roots of the molars. Measurements were made at 20 sites, equally distributed in the buccal, mesial, lingual and distal direction. The results showed that the Ca/P ratio (weight %) was slightly above 2.0 in both the experimental and the control group, indicating that the corticosteroid induced dentin had a normal Ca/P ratio. However, different degrees of mineralization were found in different directions of the roots.
本研究的目的是调查皮质类固醇诱导形成的牙本质的钙（Ca）和磷（P）组成是否与正常发育的牙本质相同。七只大鼠静脉注射皮质类固醇，三只大鼠作为对照。对磨牙轴向锯开的牙根进行能量色散X射线微分析（EDX）。在颊侧、近中、舌侧和远中方向等距分布的20个部位进行测量。结果显示，实验组和对照组的Ca/P比（重量%）均略高于2.0，表明皮质类固醇诱导形成的牙本质具有正常的Ca/P比。然而，在牙根的不同方向发现了不同程度的矿化。
