Objective: The purpose of this study was to evaluate the effect of two different ratios of silanized mica filler and milled glass fibers reinforcement on color of acrylic denture teeth materials.

Methods: Ten acrylic resin discs made of acrylic denture teeth material (PMMA) fabricated by the manufacturer were used as the control group. Four experimental groups were modified from the control group's PMMA material by adding two different ratios (5%,10%) of silan-treated mica filler and two different ratios (5%,10%) of milled-glass fibers by weight. Each group were consisted of ten specimens. Measurements were made by spectrophotometer CM-2600d (Konica Minolta Sensing,Inc.,Japan) and the color changes were characterized in the Commission Internationale d'Eclairage L*a*b* color space.

Results: According to the statistical analysis (Kruskal Wallis test, Dunn's multiple comparison test) when compared control group's L*(mean=69.2692±0.7290) and a* (mean=0.4535±0.1894) values, to L*(mean=67.1200±0.5135) and a*(mean=0.9880±0.1104) values of 5% mica filler consisting group, significant differences have been determined. Also L*(mean=67.1000±0.5536), a*(mean=0.9611±0.1408) and b*(mean=12.9000±0.2908) values of 10% milled glass fibers group showed significant differences when compared to control group's values.

Conclusions: Modification of PMMA denture teeth material by silan-treated mica filler and silan-treated milled-glass fibers for the purpose of reinforcement caused significant changes on the original color of the material.

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