Abstract :
This research aimed to study the effect of the type of provisional compensation material and polishing material on the color stability of compensation provisional to determine which temporary compensation and polishing materials studied are best and have the greatest color stability. The research sample consisted of 40 provisional crowns designed for an upper premolar that was prepared to receive a full ceramic crown, where the sample was divided after obtaining it into two main groups according to the type of compensation used (Bis-acryl by direct method and PMMA by indirect method by CAD/CAM technology), then each group of the study sample was divided into two groups according to the type of polishing material used (aluminum oxide paste or diamond paste), then the colorimetric measurements of the research sample were carried out using a spectrophotometer (VITA Easyshade V, Germani) The crowns were then immersed in a solution of coffee and distilled water and stored in an incubator at (37+-1)C for 7 days. Then the colorimetric measurements were re-performed and the amount of color change ΔE was calculated for each of the research samples. The data were analyzed using one-sided analysis of variance (ANOVA) and two-way comparison test using the method of least significant differences (LSD). At the confidence level of 95%, there are statistically significant differences in color stability in the average amount of change ∆ E between Bis acryl crowns and PMMA crowns, there were no statistically significant differences between aluminum oxide and diamond in the chromatic stability of the studied temporary compensation. Within the limitations of this study, we conclude Samples that contain PMMA which manufactured by CAD/CAM method showed stability chromatically greater than samples that enter into the composition of Bis-acryl which manufactured by the direct method, and there was no difference between the effect of each of the two materials aluminum oxide And diamond in the chromatic stability of the temporary compensation material, and the type of temporary compensation material had the greatest effect In the color change ∆E of the studied sample compared to the type of polishing substance used.
