The purpose of this study was to evaluate the color differences that can exist between the #67 Trubyte Bioform shade guide of the full thickness, the half thickness, the full thickness with silver color die spacer and the half thickness with silver color die spacer and the sample fabricated by the laboratory made with the identical shade designation in the dental laboratory using colorimeter(TC-6FX, TokyoDenshoku Co., Ltd., Ja )an).
The four kinds of the full thickness, the half thickness, the full thickness with silver die spacer, the half thickness with silver color die spacer of X67 Trubyte Bioform shade guide were made. The sample fabricated by the laboratory were made according to the firing schedules for Ceramco opaque and body porcelain out of # 67 Ceramco porcelain powders with the backing of the nonprecious Vera Bond metal plate- of the round form with the thickness of 0.5 mile
The color of the four kinds of # 67 Trubyte Bioform shade guide and the sample fabricated by the laboratory was expressed in terms of CIE L*a*b* color coordinates by means of a colorimeter. Color differences (oE*ab) for each paired comparison within each shade group were calculated from the color data.
The results were as follows:
1 The means of L*, a*, b* of the sample fabricated by the laboratory and the full thickness, the half thickness, the full thickness with silver color die spacer, and the half thickness with silver color die spacer of # 67 Trubyte Bioform shade guide were measured (Table 2).
2 There were not statistically significant difference at a* and b* except L* at L*a*b* color coordinates between the full thickness of # 67 Trubyte Bioform shade guide and the sample fabricated by the laboratory and there were statistically significant difference between the half thickness of # 67 Trubyte Bioform shade guide and the sample fabricated by the laboratory.
3. There were not statistically significant difference except b* of the half thickness with silver color die spacer of # 67 Trubyte Boform shade guide at L*a*b* color coordinates between the full thickness and half thickness with silver color die spacer of #67 Trubyte Bioform shade guide and the sample fabricated by the laboratory.
4. As the color difference ( E*ab) between the sample fabricated by the laboratory and the # 67 Trubyte Bioform shade guide by the modification increased in the order of the half thickness with silver color die spacer (0.991), the full thickness with silver color die spacer (1.157), the full thickness (2.399) and the half thickness (7.732), the color of the sample fabricated by the laboratory were to copy more easily the full thickness and half thickness with silver color die spacer of # 67 Trubyte Bioform shade guide (Table 4).
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