Purpose: The purpose of this in vitro study was to investigate the effect of different drinks on stainability of 2-computer-aided manufacturing (CAD-CAM) milled and conventional interim materials.

The aim of this invitro study is to compare the effects of different beverages on the color stability of CAD-CAM temporary restoration materials.

Material and methods: A total of 120 rectangular specimens of 2 mm thickness for each interim material Vita CAD Temp (Vita Zahnfabrik, Germany), Telio CAD (Ivoclar Vivadent, Liechtenstein) and Temdent (Schütz Dental, Germany).

Each group of specimens was then divided into 4 subgroups (n=10) and stored in 30 days at 37°C in different solutions: artificial saliva, cola, coffee, and cherry juice. Colour parameters were measured with a spectrophotometer before and after the storage period. Color parameters were measured with a spectrophotometer before and after each storage. Colour differences (CIEDE2000 [DE00]) were calculated. Data were statistically analyzed with 2-way analysis of variance (ANOVA) and mean values were compared by the Tukey HSD test (a=.05).

Results: Regarding the analysis of color differences, there were statistically significant differences between materials and solutions (P<.001). Among the solutions, there was a significant difference between all groups (P<.001). The lowest change was observed in saliva. When ?E00 values were compared, there was no difference between Teliocad and Vitacad (P=.751). Overall, the highest ?E00 values were obtained in Temdent material immersed in coffee (2.74±0.15); while the lowest values were calculated in Vitacad immersed in saliva (0.36±0.02).

Conclusion: Temdent showed the highest color change when immersed in coffee, while Vitacad immersed in saliva showed the lowest value. The color change of all materials were perceivable but clinically acceptable.

Keywords: CAD-CAM, Color stability, provisional restorative materials, Spectrophotometry