ObjectiveThe aim of this study was to investigate the color change, translucency, and whiteness index of three different resin matrix ceramics and a resin composite subjected to different bleaching agents.Materials and MethodsTwenty disc‐shaped specimens (A2 shaded) for three different resin matrix ceramic brands (Groups Ena, Ulti, and Cera) (totally 60) were prepared using the CAD/CAM technique and 20 nanofiller composite specimens (Group Comp) (A2 shaded) with the same dimensions were prepared as the control group. The color change (∆E00), relative translucency parameter (RTP), and whiteness index (WID) of the specimens initial and after different bleaching procedures (home‐bleaching and office‐bleaching) were calculated using ∆E00, TP00, and WID formulas. Two‐way analysis of variance (ANOVA) and multiple comparison test with Bonferroni correction (α = .05) at the significance level of P < .05 were performed for the comparisons of ∆E00 values. The RTP and WID values were evaluated by using repeated measures ANOVA and multiple‐comparison test with Bonferroni corrections (α = .05) at the significance level of P < .05.ResultsBleaching procedure and material type were found to be significant regardless of bleaching type for RTP and WID values. Material type has a significant effect on the ∆E00 values. The highest color change values were determined in Group Comp (P < .05).ConclusionsBleaching procedures significantly affected the RTP values of Groups Ulti and Cera (P < .05). ∆E00 values for the resin matrix ceramics after the bleaching procedures were below the clinically acceptable values, regardless of the bleaching agent.Clinical SignificanceOptically, materials such as resin matrix ceramics have properties different from not only enamel and dentin but also among themselves. The possible effect of bleaching agents on these materials should be considered carefully while choosing the restorative material.

Objectives: The molecular composition of the salivary pellicle adsorbed on the surface of dental alloys is determined by the chemical structure of the alloy. The purpose of this study is to compare the composition of salivary pellicle on two dental alloys, chrome cobalt (Co-Cr) and nickel chromium (Ni-Cr) surfaces.Materials and Methods: Protein profile of 2 hour salivary pellicle on customized Co-Cr and Ni-Cr palatal plates were kept in the mouth of healthy volunteers for two hours. Pellicle was used to compare the parotid and the whole saliva using SDS-PAGE (sodiumdodecylsulphatepoyacrylamide gel electrophoresis) and Western blot analysis.Results: Only a limited number of salivary proteins was observed in both Co-Cr and Ni-Cr pellicle. In addition, there were differences in proteins observed Co-Cr pellicle vs. Ni-Cr pellicle. Conclusion:The result of this study suggest there is selectivity in salivary protein adsorption to Co-Cr and Ni-Cr dental prostheses.