Abstract
Purpose: For the colorimetric evaluation of ceramic blocks for CADCAM, we analyzed the color space of natural teeth, and colorimetrically compared natural teeth with ceramic blocks.Methods: We measured the color of healthy maxillary central incisors of 200 males and females and ceramic blocks for CADCAM fabrication of all-ceramic crowns using a colorimeter for dental use (Crystaleye Spectrophotometer®). Using blocks, which are cut into the crown contour and polished, samples (1.5 mm in thickness) were prepared and placed on background samples, and color was measured. Colorimetric data of natural teeth were analyzed and compared with those of ceramic blocks.Result: Concerning the color space of natural teeth, a decrease in L*, increases in a* and b*, and an associated increase in C* with age were observed. Concerning the color space of ceramic blocks, the percentage of ceramic samples showing a color difference from natural teeth ≤ 3.0 decreased with age.Conclusion: Natural teeth showed a decrease in brightness and increases in red and yellow with age. With age, discrepancy in the color space between ceramic blocks for CADCAM and natural teeth was observed. To improve this discrepancy and obtain a color space close to that of natural teeth, blocks located in color spaces that are less bright and redder than those of existing ceramic blocks are necessary.
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