Objectives: The translucency parameter (TP) of 3 bleach shades of 2 microhybrid and 2 microfilled composites was studied after light curing the composites. Methods: The microhybrid composites were: Charisma (CH, shades SLO, SLT, SL) and Renamel Universal (RU, shades SB1, SB2, SB3). The microfilled composites were: Durafill VS (DF, shades SLO, SSL, SL) and Renamel Microfill (RM, shades SB1, SB2, SB3). TP of another 18 composites was measured as well. Composite specimens (10 mm in diameter, 2-mm thick) were light cured. Color (L*a*b*, D55) was measured on black and white backgrounds using a reflection spectrophotometer. Translucency parameter (TP) was calculated as DE* (black-white). Data were analyzed by ANOVA. Results: Means (s.d.) of TP were: Microhybrid - SLO, 3.1 (0.5); SLT, 4.1 (0.4); SL, 3.4 (0.3); SB1, 2.9 (0.4); SB2, 3.8 (0.3); SB3, 4.0 (0.2); Microfilled - SLO, 4.4 (0.4); SSL, 3.3 (0.2); SL, 5.0 (0.3); SB1, 3.4 (0.3); SB2, 3.7 (0.3); SB3, 4.0 (0.3). Tukey-Kramer intervals (p=0.05) for comparisons among 3 shades and between 2 composites were 0.1 and 0.1. TP ranged from 2.0-7.1 among 23 microhybrid composites and 2.5-5.0 among 7 microfilled composites. Proposed classification of translucency (TP) is: 2.0-3.7, low; 3.8-5.4, medium; and 5.5-7.1, high. Conclusions: Values of TP of microhybrid and microfilled composites with the same shade designation were not always the same. Shade designations were sometimes misleading. Supported by Bisco, Dentsply/Caulk and Ultradent.

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