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

OBJECTIVE

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.

MATERIALS AND METHODS

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 3 W Er, Cr:YSGG laser irradiations (L , L ) (n = 15). The color values of specimens were recorded before and after surface-conditioning using a spectrophotometer. The translucency parameter (RTP ) and color difference (ΔE ) values were calculated. Data were statistically analyzed using three-way ANOVA and Tukey post hoc tests.

RESULTS

The translucencies of RMCs decreased after all surface-conditioning procedures. L caused more decline in translucency of materials than APA. All ΔE values were under the acceptability threshold except for APA-applied Voco Grandio at 0.5 mm. Differences in ΔE values between APA and L groups were significant (P˂0.05); while differences between L and L groups were insignificant (P > .05). In all experimental groups, ΔE values decreased with increasing thickness of RMCs.

CONCLUSIONS

L and APA significantly affected the translucency and color properties of RMCs. APA was found more favorable than L.

CLINICAL SIGNIFICANCE

Clinicians should carefully use surface conditioning methods, considering their impact on the optical characteristics of RMCs, especially when the restoration is thin.