CCMによる歯冠色グラデーションの構築

抄録

An objective methodology of color reproduction based on color science has been attempted for dental restoration. The purpose of this study was to evaluate the accuracy in reproducing a tooth color gradation in ceramic by means of a Computer Color Matching (CCM) system employing a prototype program and spectrophotometer measurements. The colors of 5 shade tabs of VITAPAN 3D MASTER were measured for 4 regions of each tooth from the incisal to the gingival area. Ceramic prescriptions calculated by CCM program were used to fabricate tooth shaped ceramic specimens using IPS Empress 2. Formulated ceramic powders were applied to the color regions and blended at the interfaces for shade continuity. Color coordinates L^*, a^* and b^* of ceramic specimens and target shade tabs for each pair in 10 incremental areas (each 1 mm x 3 mm) indicated very similar values. Color difference (dE) were below 3.6 in all 10 incremental areas. It was concluded that the CCM methodology reproduced the target tooth color gradation at a clinically satisfactory level.