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Color Adjustment Potential of Resin Composites

¹ University of Texas Dental Branch at Houston, Houston, TX, USA;
² University of Leeds School of Design, Leeds, UK; and
³ Ohio State University College of Dentistry, Columbus, OH, USA

^* corresponding author, Department of Restorative Dentistry and Biomaterials, 6516 M.D. Anderson Boulevard, Ste. 493, Houston, TX 77030-3402, USA; Rade.Paravina{at}uth.tmc.edu

The study objective was to explore a new method for quantifying the color adjustment potential originating from physical translucency on a set of 7 resin composites, and then for testing the hypothesis that color adjustment potential is dependent on the composites and shades studied. Two-composite specimens (an outer base shade with an inner hole filled with inner test shades) and single-composite specimens of all shades were made. A 1-mm circular area, with its center in the middle of the specimen (P0mm), was measured by means of spectroradiometry. A newly developed equation for quantification of the color adjustment potential was tested. Color adjustment potential at P0mm ranged from –0.19 (negative color adjustment/contrast) to 0.61. Within the limitations of this study, a newly developed concept and equation have proved the existence of the physical component of color adjustment of translucent dental materials. Color adjustment potential was dependent on composite and shade.

KEY WORDS: color shift • resin composite • translucency • blending • spectroradiometry