Background: Porcelain restorations have double-layer color effects resulting from the presence of translucent and opaque layers. Enough thickness of translucent dentin porcelain was needed to imitate the optical property of natural teeth. 实验背景:陶瓷修复体的颜色是由不透明瓷层/透明体瓷层的双层颜色效果决定的,要使金属烤瓷修复体能和天然牙齿的颜色相匹配,需要一定的瓷层厚度。