关键词: 硬化牙本质, 复合树脂

Abstract: Sclerotic dentin，also named as transparent dentin，is a kind of reactive change of dentin，has great difference from normal dentin in structure.Because of the deposition of mineral salts， the diameter of sclerotic dentinal tubules grows smaller and the lumens block up partially，preventing resin tag formation;at the same time sclerotic dentin has strong ability of anti-acid that decreases the bonding strength between sclerotic dentin and composite resin， about 26-30% lower than normal dentin，and resists the etching action.The effect of the sclerotic dentin repaired with composite resin can be affected by the quality and quantity of hybrid layers and resin tags，and different etching systems and acid etching time.In the clinic， effective method should be found in order to improve clinical curative effect.

Key words: sclerotic dentin, composite resin