Study on Optical Properties of Human Tooth and Restorative Materials

在本研究中，我们研究了人类牙釉质、牙本质和修复材料（如复合树脂、冠桥树脂和着色改性树脂）的透光特性，包括波长分布和扩散特性，并评估了透光特性对材料颜色外观的影响。在400 ~ 700 nm波长范围内，牙釉质的总透射系数为0.37 ~ 0.43。该数值高于复合修复树脂，与冠状树脂、桥状树脂和涂覆树脂的数值基本相等。冠桥树脂和上漆树脂也表现出与牙釉质相似的透光分布光谱和扩散特性。天然牙与材料的颜色外观相匹配是理想的。结果表明，透光特性对修复树脂的颜色有重要影响。材料和色度之间透光特性的显著差异会影响其临床表现。

In this study, we examined the light transmittance characteristics, include wavelength distribution and diffusion characteristics, for human enamel, dentin and restorative materials such as composite resins, crown and bridge resins, and paint-on resins for shade modification, and evaluated the effect of light transmittance characteristic on color appearance of the materials.The values of overall transmission coefficient of enamel ranged from 0.37 to 0.43 in overall wavelength (400-700 nm). The values were higher than those of composite restorative resins, and almost equal to those of crown and bridge resins, and paint-on resins for shade modification. The crown and bridge resins, and paint-on resins also showed similar light transmittance distribution spectra and diffusion characteristics to enamel. It is desirable for the materials to match color appearance between natural tooth and materials. The results indicate that the light transmittance characteristics play an important role for the color of restorative resins. The significant difference in light transmittance characteristic among materials and shades will affect their clinical appearance.