How will surface conditioning methods influence the translucency and color properties of CAD-CAM resin-matrix ceramics with different thicknesses?

Abstract

It was aimed to evaluate the effect of various surface-conditioning methods on the translucency and color properties of resin-matrix ceramics (RMCs) with different types and thicknesses. Rectangle-shaped RMCs were prepared from Voco Grandio, Brilliant Crios, Lava Ultimate, GC Cerasmart, and Vita Enamic blocks at 0.5 and 1.0 mm thicknesses. Specimens were divided into four groups: control, airborne-particle abrasion (APA), 2 and 3W Er, Cr:YSGG laser irradiations (L2W , L3W ) (n=15). The color values of specimens were recorded before and after surface-conditioning using a spectrophotometer. The translucency parameter (RTP00 ) and color difference (ΔE00 ) values were calculated. Data were statistically analyzed using three-way ANOVA and Tukey post hoc tests. The translucencies of RMCs decreased after all surface-conditioning procedures. L caused more decline in translucency of materials than APA. All ΔE00 values were under the acceptability threshold except for APA-applied Voco Grandio at 0.5 mm. Differences in ΔE00 values between APA and L3W groups were significant (P˂0.05); while differences between L2W and L3W groups were insignificant (P >.05). In all experimental groups, ΔE00 values decreased with increasing thickness of RMCs. L and APA significantly affected the translucency and color properties of RMCs. APA was found more favorable than L. Clinicians should carefully use surface conditioning methods, considering their impact on the optical characteristics of RMCs, especially when the restoration is thin.