Abstract
Aims: The aim of this research was to study the effect of artificial aging on the translucency of four different veneering restorations. Materials and methods: Twenty laminate veneers were prepared on prefabricated metal dies of upper right central incisors with incisal lap preparation design using CAD-CAM system from four different materials (Zircad Prime "ZP", DD cubeX2 ML "DD", CopraSupreme Symphony "WP", IPS E.max CAD), with 0.5 mm thicknesses. The samples were divided into four equal groups with five samples from each material, aging was done in the steam autoclave at (134c) and (0.2 Mpa) for five hours according to (ISO 13356). TP was tested using a (3nh) colorimeter. Statistical analysis was done using ANOVA at a level of significant 5%. Results: The mean of translucency parameter (TP) between the examined groups shows that lithium disilicate and Zircad prime (ZP) groups showed significant differences, while White Peak (WP) and Direct Dental (DD) showed no significant difference. Conclusions: lithium disilicate material and ZP were affected by aging, while other types of zirconia including WP and DD were not affected by aging due to their structural composition.
