Effect of thickness, cement shade, and coffee thermocycling on the optical properties of zirconia reinforced lithium silicate ceramic

Abstract

Objective: To investigate the effect of thickness, cement shade, and coffee thermocycling (CTC) on the optical properties of zirconia reinforced lithium silicate (ZLS) paired with different shades of a resin cement.Materials and Methods: Thirty ZLS specimens were prepared in two different thicknesses (0.8 and 1.5 mm) and three different resin cement shades (Tr, A2, and A3) were applied (n = 5). Color determinations were done before and after 5000 CTC by using a noncontact spectroradiometer. Color change due to CTC and relative translucency parameter (RTP) before and after CTC were calculated by using CIEDE2000. Data were analyzed using ANOVA and Bonferroni-corrected t-tests(α = 0.05).Results: Material thickness and resin cement shade (P < 0.001) affected baseline color. Material thickness affected color difference (P = 0.025). Thickness, resin cement shade, and CTC (P ≤ 0.0001) affected RTP. The difference between the color changes of the 0.8-and 1.5-mm specimens combined with A2 shade cement after CTC was significant (P = 0.01). RTPs of all pairs decreased after CTC (P < 0.001).Conclusions: Cement shade and material thickness affected the baseline color. The thickness of ZLS affected the color change after CTC only with A2 resin cement and the color change was less when the ZLS was thicker. CTC reduced the translucency of all pairs. Clinical Significance: Clinicians and patients should be aware of a potential color change after long-term coffee consumption when zirconia reinforced lithium silicate is used particularly for laminate veneers with A2 shade of the tested resin cement.

Load-to-Failure Resistance and Optical Characteristics of Nano-Lithium Disilicate Ceramic after Different Aging Processes

“…However, new materials that have similarities and differences with LDS are frequently introduced [ 11 , 12 ]. One of those materials was zirconia-reinforced lithium silicate glass-ceramic (ZLS; Vita Suprinity, Vita Zahnfabrick, Bad Säckingen, Germany), which was launched as a unique material that combines the advantages of lithium disilicate and zirconia [ 13 , 14 ] due to 10 wt% of zirconium dioxide dissolved in its glassy matrix [ 15 ]. Recently, a new lithium disilicate called nano-lithium disilicate glass-ceramic (NLD; Amber Mill, Hass, Gangneung, Korea) has been marketed [ 7 , 8 , 12 ].…”

Translucency, color stability, and biaxial flexural strength of advanced lithium disilicate ceramic after coffee thermocycling

“…[9][10][11] Zirconia-reinforced lithium silicate glass ceramic (ZLS) has been launched as a unique material that combines the advantages of lithium disilicate and zirconia [12][13][14][15][16] due to 10 wt% of zirconium dissolved in its glassy matrix. 17 Currently, ZLS is available either in crystallized (Celtra Duo; Dentsply Sirona) or pre-crystallized form (Vita Suprinity; Vita Zahnfabrik). 18,19 Even though both materials comprise a similar microstructure, 18,20 a previous study has reported that precrystallized ZLS had higher flexural strength values than crystallized ZLS.…”

Color Stability of three esthetic monolithic block materials after immersion in commonly consumed beverages

“…Several methods can be used to measure the color change, whereas a spectrophotometer is considered a reliable, reproducible, and accurate color measuring device so it was used in this study. 7,9,19,32 Color change of specimens was measured against a white background as it compensates for chromatic shortage resulting from potential absorption effects on any of the color parameters. 39,40 Results of this study showed that coffee immersion produced the highest color change in Vita Enamic followed by Lava Ultimate where both values were greater than the acceptable threshold (AT) ≤3.3 for color change 3,7,19,26,29,32,41 while Vita Suprinity recorded the least color change.…”

“…1,2 Computer-aided design/computeraided manufacturing (CAD/CAM) monolithic block materials opened up a new horizon in dental treatment to meet the expectations of the clinicians and patients allowing time-efficient fabrication of precise tooth-colored highly reliable restorations. [1][2][3][4][5][6][7][8][9][10] Generally, CAD/CAM materials used to produce monolithic restorations can be categorized as ceramic/glass ceramic, indirect resin-based composite, and hybrid ceramic. Ceramic/glass ceramic include zirconia, lithium disilicate ceramics, zirconia reinforced lithium silicate ceramics, leucite reinforced ceramics and feldspathic ceramics.…”