Aim: To evaluate the effect of the organic acid solution on color stability of the facing heat-curedacrylic resin. Materials and methods: Two heat-cured facing acrylic resins were used in this study.Sixty four rectangular shape specimens were prepared to evaluate the color changes of the heat-curedacrylic resin after immersion in three organic acids (acetic, citric and lactic acids). The specimens weredivided into two groups according to tested resin materials, and then subdivided into four tested groupsaccording to immersion solution, eight specimens for each subgroup. The assessment of color property(opacity) done by using ultra-violet visible spectrophotometer at wavelength 345 nm. Mean valueswere compared statistically with one way analysis of variance (ANOVA) followed by Duncan , s multiplerange test to determine the significant difference among the tested groups at (p<0.05) level of significance.Results: The results showed that there is a significant difference of the means value of thecolor change among the four tested groups for both tested materials for two different immersion periods,but there is no significant difference of color change between tested materials. Specimens immersedin acetic acid have a higher value than that immersed in other organic acids. Conclusion: Theresult of this study show that immersion in organic acids for different immersion periods had a significanteffect on color stability of the facing heat-cured acrylic resin cured acrylic resin .
Key words : color change , heat-cured acrylic resin, organic acids
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