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Since the ideal color mathching has not certainly been attained in laminate veneer restoration, it might be partly due to the insufficient knowledge about color of natural and discolored tooth. To overcome the problem, it would be important to examine the color difference between natural and discolored tooth. The left upper anterior teeth color were measured in the mouth by a small area colorimeter and evaluated by CIE L*a*b*color system. The following conclusions were obtained.1. Discolored anterior tooth was darker and more reddish than natural anterior tooth.2. Concerning the type of anterior teeth, the respective tendency of L*a*b*was the same between discolored and natural teeth.3. Concerning each part of the same tooth, the respective tendency of L*and b*was the same between discolored and natural teeth.4. The color difference (ΔEab*) compared between each type of anterior tooth, those of discolored tooth were little greater than those of natural tooth.5. The color difference (ΔEab*) compared between each part of tooth, those of discolored tooth were much greater than those of natural tooth.

A Study on Color of Laminate Veneer Restoration. Comparing between Normal and Discolored Tooth.