The effect of artificial accelerated aging on the color stability, microhardness, and surface roughness of different dental laminate veneer materials

Abstract

© 2020 Wiley Periodicals, Inc.Objective: This study aimed to evaluate the effect of artificial accelerated aging (AAA) on color stability, surface roughness, and microhardness of three laminate veneer (LV) materials. Materials and Methods: Specimens of ceramic LV (CLV-IPS E.max Press), hand-layered composite LV (hand-layered laminate veneer [HLV]-Tetric N-Ceram), and prefabricated composite LV (prefabricated laminate veneer [PLV]-Componeer Coltene) were prepared as discs (n = 10). CIE L*, a*, and b* color coordinates, the Vickers microhardness, and surface roughness were measured 24 hours after preparation and reevaluated after aging for 300 hours in an ultraviolet (UV)-AAA system (Ci35 Weather-Ometer). Color difference (CIEDE2000 [ΔE00]) was calculated. Data were statistically analyzed with the Shapiro-Wilk test and the Kruskall-Wallis test followed by the Mann-Whitney U tests (α =.05). Results: All of the LV groups showed significant differences in ΔE00 after AAA (P <.001). Comparing the color changes of the HLVs with the PLVs, no significant difference could be found (P =.705). There was a statistically significant difference in the means of changes in microhardness among the LVs materials (P <.001). The changes in surface roughness results showed a significant difference after AAA in all the LVs (P <.001). Conclusions: Within the limitations of this in vitro study, the color stability, the microhardness, and surface roughness of tested LVs were influenced by AAA. Clinical significance: The prefabricated composite LV system does not replace the individualized ceramic LV technique, but rather offers an alternative to hand-layered LVs, which is delicate and time-consuming technique.