带金属底冠定制比色板的制作及其颜色特征

The fabrication and chroma study of a kind of custom shade guide with metal substrate

目的:探讨带金属底冠定制比色板的制作方法对其颜色特征的影响。方法:以右侧上颌中切牙为模型,按照临床金属融附烤瓷全冠的制作要求,制作与VITAPAN比色板颜色相对应的16色带金属基底的定制比色板标本,采用PR-650型光谱扫描色度仪,对上不同瓷层后的比色片进行颜色测量。结果:上釉完成后的比色片与上遮色瓷时的比色片进行比较,发现L*值呈下降趋势,a*、b*值呈上升的趋势。从上遮色瓷到上体瓷的过程中,比色片的L*值明显下降,而a*、b*值明显增加;随着釉瓷和透明瓷厚度的增加,L*、a*和b*值均稍有减小;上釉可增加比色片的明亮度。结论:金瓷修复体中各瓷层对修复体颜色都会产生一定影响,并且其影响作用各不相同。

PURPOSE： This study was to explore the chroma of a custom shade guide with metal substrate. METHODS： A custom shade guide sample was fabricated using the central maxillary incisor as a model,which was corresponding to the colour of VITAPAN shade guide.The colour of each shade tab was measured with PR-650 spectrophotometer when every porcelain was added. RESULTS： From the opaque to glaze, the lightness was decreased and the chroma was increased distinctively; When the body porcelain were baked over their corresponding opaque, the lightness was decreased and the chroma was increased; When the enamel porcelain and the translucent porcelain were added on, the lightness and chroma were decreased slightly; the glaze could increase the lightness. CONCLUSION： The “add on” porcelain can affect the final color of the restoration, and the effects of each porcelain layer were different from each other.