Abstract
AimThe aim of this in vitro study was to evaluate the new, multilayered, translucent zirconia and enhanced glass-ceramics to determine if their translucency (TP) and color stability (ΔE) are affected by thermocycling at 10,000, 30,000, and 50,000 cycles.Materials & methodsTwo pre-shaded, multilayer zirconia products: Prettau® 2 Dispersive® (PRT) and Prettau® 4 Anterior® Multi® (PRTA), and two glass-ceramic: IPS e.max CAD® HT (E.max) and Vita Suprinity® HT (VS) were used. All were prepared and sectioned to get plate specimens with dimensions 12.5x14.5x1 mm (n=12) for each material. The L*a*b* values were recorded using a spectrophotometer before and after thermocycling for 10,000, 30,000, and 50000 cycles. The translucencies of the specimens were calculated using the TP formula and the color changes were giving by the color differences ΔE formula at each interval.ResultsOne-way analysis of variance (ANOVA) was used to analyze the data followed by Scheffe’s post-hoc test and multiple paired t-tests (P < 0.05). There was a statistically significant higher TP for E.max before (16.2) and after aging (16.9) (p<0.001**). All the tested groups showed a statistically significant increase in their TP at different intervals. PRT showed significantly higher ΔE (p<0.001**) after 50,000 cycles.ConclusionThere was a mild but significant increase in translucency in both Zirconia and glass-ceramic after thermocycling. In addition, all materials showed a significant color change with time, however, this is not clinically perceptible.
Highlights
Esthetic and physical durability are two of the prime factors that clinicians consider when selecting dental ceramic materials [1]
The materials selected were lithium disilicate (IPS e.max computeraided design (CAD)®) (E.max), which served as the control group and three test materials, namely, multilayer posterior zirconia (Prettau® 2 Dispersive®) (PRT), multilayer high translucent zirconia (Prettau® 4 Anterior® Dispersive®) (PRTA), and zirconia-reinforced lithium silicate (Vita Suprinity®) (VS)
The goal of the present study was to examine the translucency of Prettau ® Dispersive® (PRT), Prettau® Anterior® Multi® (PRTA), and Vita Suprinity® High translucent (HT) (VS) and to determine the effect of thermocycling on their translucency and color stability
Summary
Esthetic and physical durability are two of the prime factors that clinicians consider when selecting dental ceramic materials [1]. Monolithic yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) was introduced to overcome the fracture and chipping of the veneering porcelain from the opaque substructure zirconia material [4,5]. It is still showing lower translucency than glass-ceramics. The manufacturer is responsible for the intrinsic factors and can include the crystal content and the size of the crystals, increasing the yttria, introducing lanthanum oxide (La2O3) in the composition, and lowering the alumina content and the sintering temperature [6,7,8,9]. Manufacturers of newer zirconia systems claim that the materials have improved translucent properties
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