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- 2018
龋影响牙本质折射系数变化的体外研究
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Abstract:
摘要 目的:利用光学相干断层成像技术(OCT)分析龋影响牙本质折射系数变化。方法:选取4颗无龋坏和15颗颌面牙本质龋下颌第三磨牙。垂直牙冠长轴制备厚度为300~500 μm的10个无龋和15个龋影响牙本质切片,分别纳入对照和研究组。使用micro-CT和自建OCT扫描切片并重建其三维数字模型。应用基于改良canny边界提取技术的光程通路法分析无龋和龋影响牙本质切片折射系数;通过对比牙本质切片和参考体(K2HPO4液)的X线灰度值,计算龋影响牙本质矿化密度。结果:由参考中心点到釉牙本质界,无龋牙本质折射系数先增大而后减小,均值为1.578;龋影响牙本质折射系数无明显变化,均值为1.507,两者间存在显著差异(P<0.001)。龋影响牙本质折射系数和矿化密度间存在显著正相关趋势(P<0.001)。结论:龋引起牙本质折射系数发生改变。矿化密度是导致牙本质折射系数下降的重要因素
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