Abstract
BackgroundHigh-translucency monolithic zirconia were developed to combine the esthetics of all ceramic restorations with the strength properties of zirconia. The purpose of this study was to compare the color stability of high-translucency monolithic zirconia ceramics with lithium disilicate luted using light-cure versus dual-cure resin cements following thermocyclic aging.MethodsForty specimens, each composed of 10 × 10 × 1 mm ceramic slice luted to dentin surface of an extracted tooth, were prepared and assigned into four groups (n = 10) as follows; LiDi/LC: lithium disilicate luted by light-cure resin cement; LiDi/DC: lithium disilicate luted by dual-cure resin cement; Zr/LC: zirconia luted by light-cure resin cement; and Zr/DC: zirconia luted by dual-cure resin cement. Color analysis of the specimens was performed before and after 3000 thermal cycles by means of spectrophotometry. The CIE L*a*b* values of the specimens were measured, and data were analyzed statistically at a significance value of p < 0.05.ResultsThermocycling resulted in a significant change in color coordinates of specimens with an overall ΔE = 3.59 ± 1.60, but there was no statistically significant difference in the color change value among all tested groups (P = 0.756).ConclusionsAt 1 mm restoration thickness, the color stability of high-translucency monolithic lithium disilicate and zirconia ceramics were not significantly different irrespective of the cement type used.Clinical implication Understanding the difference in color stability of dental ceramics may help in determining long-term esthetic result.
Highlights
High-translucency monolithic zirconia were developed to combine the esthetics of all ceramic restora‐ tions with the strength properties of zirconia
Clinical implication Understanding the difference in color stability of dental ceramics may help in determining longterm esthetic result
Each slice was polished using silicon carbide grinding paper, zirconia was sintered at 1550 °C for 2 h and Lithium disilicate was crystallized by firing at 770 °C for 5 min followed by firing at 850 °C for 10 min according to the manufacturer’s recommendations
Summary
High-translucency monolithic zirconia were developed to combine the esthetics of all ceramic restora‐ tions with the strength properties of zirconia. Dental material manufacturers have developed high-translucency monolithic zirconium oxide restorations to combine the esthetics of all ceramic restorations with the superior strength properties of zirconia [2]. Church et al [2] reported in an in vitro study that a lithium disilicate material (IPS e.max CAD) has greater translucency than four other types of high-translucency monolithic zirconia. These were BruxZir shaded 16, InCoris TZIC, Lava Plus, and BruxZir HT, all being of the same thickness. Yan et al [3] found that the translucency of lithium disilicate is superior to those of both, 4-Y-PSZ (4 mol% yttria partially-stabilized zirconia) and 3-Y-PSZ, whereas it was insignificantly different from that of 5-Y-PSZ
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