Color Stability of Nanohybrid and Microhybrid Composites in Common Yemeni Immersion Media Including Qishr, Coffee, and Qat: A Laboratory-Based Study

Background: This in vitro study aimed to evaluate the color stability of microhybrid and nanohybrid restorative composites after exposure to immersion media common in Yemen for different periods. Methods: : Two composite materials, nanohybrid Tetric N-Ceram and microhybrid Te-Econom Plus, were investigated. Six groups of 30 cylindrical specimens (n = 5/group; diameter, 10 mm; thickness, 2 mm; shade A2) of each restorative material were immersed for 1 week in distilled water, qat solution, Yemeni coffee, traditional Yemeni coffee (qishr), red tea, and Dilsi cola. Color changes were evaluated by colorimetry. The color data and pH were measured before immersion and after 1, 3, and 7 d. Three-way analysis of variance (ANOVA) followed by one-way ANOVA and Scheffé test was used for statistical analysis. Results: : Tetric N-Ceram showed lesser discoloration than did Te-Econom Plus. Qat, coffee, and red tea caused highly significant discoloration compared with Dilsi cola and distilled water (p < 0.05). The role of low pH in discoloration depended on the colorant. Conclusions: : Nanohybrid Tetric N-Ceram composites are more resistant to discoloration than are microhybrid Te-Econom Plus composites. Qat and coffee had the highest effect on composite discoloration. These findings will aid in selecting composite materials and patient instruction. Trial registration: NA