This study analyzes and comparatively evaluate, by a visual method, the fluorescence of the color A2 composite resins for both enamel and dentin from seven different commercial sources. We made fifty-two specimens of anterior/posterior composite resins. The specimens were obtained with a rigid and transparent acrylic matrix. The polymerization was done irradiating with the 3M Curing Light 2500, intensity of 600 mW cm–² for 40 s. The specimens were polished with Sof-Lex discs. A wooden box painted with flat black paint was used to avoid light reflection and other light sources and the experiment was conducted in a darkroom. Three calibrated and trained evaluators rated the degree of fluorescence of the specimens under the effect of ultraviolet light, and classified them according to their intensity. For each evaluator, the specimens were mixed and randomly arranged inside the box. For the evaluation of fluorescence between resin enamel and dentin, the Kruskal-Wallis test (p <0.05) was applied. The best resins in terms of fluorescence of enamel are Esthet X-HD, TPH, Z350 and Opallis and for dentin are Opallis and Evolu-X.
fluorescence; composites; optical characteristics; esthetic
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