Resin cements effect on the fnal color of novel monolithic CAD/CAM restorations

BACKGROUND: This study investigated the effect of resin cement shade on the fnal color of computer aided design/computer aided manufacture (CAD/CAM) restorations. METHODS: Thirty CAD/CAM block specimens were fabricated (14×12×1.5 mm) by cutting blocks (Vita Mark II [VM], Vita Enamic [VE], and Lava Ultimate [LU]). Forty cement specimens were prepared (14×12×0.2 mm) using resin cement (RelyX Ultimate Tr, A1, a3O, Bl). Color measurements of CAD/CAM specimens were made without (control) and with each/shade of resin cement (test) with a spectrophotometer. Color differences (?E00) between the control and test groups were calculated and analyzed by 2-way ANOVA and subsequent pairwise testing. Comparisons were performed by using Tukey's multiple comparison tests (a=0.05). RESULTS: Both cement shade and interaction between cement shade CAD/CAM block type parameters were signifcant on color differences (P<0.05). A3O cement resulted in a clinically unacceptable color differences (δE00>2.25) for each tested CAD/CAM blocks. δE00 values of VM-A1 and VE-A1 groups were also higher than clinically unacceptable level (δE00>2.25). δE00 value of VE-Tr was lower than visually perceptible level (δE00=1.30). There was no statistically signifcant difference found between the δE00 values of CAD/CAM blocks in the same shade of cement groups (P>0.05). CONCLUSIONS: Tested CAD/CAM blocks were similarly affected by the cement shade and thus may have similar optical features.