Evaluation of color stability of temporary restorative materials exposed to different cleaning solutions
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OBJECTIVES: The purpose of this study was to evaluate the effects of clinical-used cleansers on the color stability of temporary restorative materials via spectrophotometric analysis. MATERIALS AND METHODS: A total of 256 specimens fabricated from four temporary restorative materials (Protemp™ Plus; Tempsmart™; Jet Tooth Shade™; VITA CAD-Temp™) were soaked for ten minutes or three hours in the following cleanser: temporary cement remover ultrasonic cleaning solution (TS), general purpose ultrasonic cleaning solution (GS), plaster and stone remover ultrasonic cleaning solution (PS) or water (control). Subsequently, the specimens were immersed for twenty-four hours in a blueberry juice or water (control). This procedure was repeated three cycles. Color measurements were performed by spectrophotometer after every immersion. Color differences (Delta E*) were evaluated using the CIE L*a* b* color system. Results were submitted to analysis of variance and Tukey honest significant difference test (p<0.001). Data were analyzed statistically by repeated measures (ANOVA); one, two and three way ANOVA, and Tukey HSD multiple comparison tests. RESULTS: Under the conditions of this study, Jet Tooth Shade™ was more color stable. Tempsmart™ displayed greater color change, especially in PS and TS. In ten minutes cleaning protocol, the color changes in all temporary restorative materials were demonstrated clinically acceptable color changes for all cleaning solutions during the three repeated cycles of immersion in cleansers. CONCLUSIONS: All the clinical cleansers used in the study affected the color values of temporary restorative materials. Furthermore, Delta E* values increased along with the number of immersion cycles and immersion time.