这些研究显示DPP在正常牙本质和病理性牙本质的形成中起重要的作用。
Previous studies clearly indicate the importance of DPP in both normal and diseased dentin formation.
结论：硬化牙本质相对于正常牙本质形成的混合层较薄或者没有，树脂突短、少。
Conclusion: the resin rags were fewer and shorter and the hybrid layers were thinner in sclerotic dentin than in normal dentin.
硬化牙本质又被称作透明牙本质，是牙本质的一种反应性改变，在结构上与正常牙本质存在很大的差异。
Sclerotic dentin, also named as transparent dentin, is a kind of reactive change of dentin, has great difference from normal dentin in structure.
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