Masking Ability of Bleach Shade Composite Resins in Different Thicknesses

Abstract

Introduction. In recent years, the use of bleach shade composite resins has increased due to the high esthetic demands. The aim of the present study was to investigate the masking ability and translucency of several bleach shade composite resins. Materials and Methods. In this in vitro study, 180 discs from 9 bleach shade composite resins of 5 brands (G-aenial Anterior, Gradia Direct, Charisma Diamond, Estelite Sigma Quick, and Renamel Microfill) in thicknesses of 0.5, 1, 1.5, and 2 mm were prepared. The color parameters of the specimens were measured in a CIE l ∗ a ∗ b ∗ system using a spectrophotometer. Masking ability and translucency parameters were calculated, and the influence of thickness, shade, and composite resin brand on these variables was analyzed using the Kruskal–Wallis and Mann–Whitney U tests. Results. Both masking ability and translucency differed significantly among groups ( p < 0.001 ), but only MA was different between different brands ( p < 0.001 ). Higher thicknesses showed lower translucency in all pairwise comparisons ( p < 0.001 ). 0.5 mm-thick specimens had lower masking ability than 1.5 mm- ( p = 0.016 ) and 2 mm- ( p = 0.035 ) thick ones. However, masking ability of other thickness pairs did not show a significant difference ( p > 0.05 ). G-aenial Anterior and Renamel Microfill had the highest and lowest masking ability. Bleach white shades had lower masking ability and higher translucency than extrawhite bleach shades. Conclusion. Translucency and masking ability of bleach shade composite resins differed in different thicknesses, composite resin brands, and shade groups.

The optical behavior of nano filled resin composite loaded with graphene oxide nanoparticles

“…These additives besides increasing the darkness of the background, they might agglomerate and change the macroscopic surface features as the surface roughness that greatly affect the optical properties of resin composite. Additionally, the findings of increased darkness of resin composite when loaded with high concentration of GONPs also agree with Lee and others [ 51 ] who revealed that if the filler size is constant, the higher filler load might produce a rough resin composite surface with subsequently reflected light scattering in different angles that lowers the translucency with a more darkening effect [ 58 , 59 ].…”

“…Additives incorporation to resin composite can change the refractive index of the matrix and increase the perceived light scattering making the material less translucent [ 51 , 52 , 58 ]. These additives besides increasing the darkness of the background, they might agglomerate and change the macroscopic surface features as the surface roughness that greatly affect the optical properties of resin composite.…”

Effect of Polishing Systems on Translucency Parameter of the Resin Composites after Aging

“…In the current study, resin composites were not colored to any agents. Translucency is influenced by various factors; the thickness of composites, [10] pigments and other chemical ingredients of the material [11] and light-curing protocol [12]. This study used composite samples of A2 tons and equal thickness.…”

Effect of novel whitening toothpastes on the surface roughness, microhardness, and color stability of anterior Extra Bleach White (XBW) composite: an in-vitro study

“…Extra white shade resin composites have been lately introduced by many manufacturers to restore bleached teeth. The color stability of those extremely white teeth shade composite restorations is very important for the patients seeking those peculiar shades 3 .…”

“…Bleach shade composites are luminous and more translucent than ordinary shades, they have lower translucency and higher masking ability. Lately there is an increased demand to use bleach shade composites, as patients request high aesthetic levels, and they are similar to tooth whitening treatment modalities 3 .…”