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

ABSTRACT

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.