Abstract
The purpose of this report was to reproduce accurate colors in metal ceramic restorations by using the Computer Color Matching (CCM) system. The conventional shade guide was used as the objective “target” colors, and a newly modified spectrophotometer was developed by our department that allowed non-contact measurements of small areas. Normal-shaped tooth preparations of the central incisors having labial reductions of 0.8-1.5 mm were done, and color shade guides were used to produce the objective metal ceramic crowns. The CCM program made it possible to calculate the amount and color of each porcelain layer within a specified thickness, and the metal ceramic crown was made based on these findings by using Shofu metal Aurora and Vintage porcelain. Opaque porcelain was baked at an even thickness of 0.3 mm based upon the CCM formulations, and the calibrated dentin and enamel was added later at their specified thicknesses.Results of the CCM made metal ceramic crown showed the color to be indistinguishable from that of the original shade guide color with the unaided-eye. Furthermore, analyses showed the color difference dE (CMC) to be under 3.0, indicating a high accuracy level in terms of color reproducibility, and its possible use in clinical practice.
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