Effects Of Different Shade Matching Methods On The Color Of Double-layered Resin Composite Restorations

Objective:The objective of this study was to investigate the effects of different enamel/dentin composite shade matching methods on the resultant color of double-layered resin composite restorations.Material and Methods: Dentin composite and enamel composite of A1、A2、A3 shade from Filtek? Z350XT(3M ESPE,USA)and Brilliant? NG( Colte` ne/Whaledent AG, Altsta tten, Switzerland) ware investigated. Resin specimens of each brand were prepared following 3double-layered color matching methods:(1) dentin shade and enamel shade with the same shade but different translucencies;(2) dentin shade was darker than enamel shade;(3) enamel shade with A3 shade. Each sample aiming at A1 and A2 shade of 3 shade matching methods was prepared in10 times( n=10), resulting in a total of 120 specimens. The color coordinates of all the specimens and the corresponding Vita Classical Shade tabs were measured by a spectrophotometer. Color differences(ΔE)between the specimens and the corresponding Vita Classical Shade tabswere calculated.Results: There were significant differences between two commercial resin composites(P < 0.05). ΔE values of Z350 were significantly lower than those of NG. Regarding to A1 shade, method 1 had the lowest ΔE value. With respect to A2 shade, the ΔE value of method 1 and 2 is the lower than method 3.Conclusions: Z350 performs better results in matching the shade guide comparing with NG. Method 1 is the best enamel/dentin composite shade matching methods for A1 shade. For A2 shade, method 1 and method 2 are batter than method 3.