Effect of surface finishing protocols on color and translucency of zirconia reinforced lithium silicate glass-ceramic after thermo-mechanical aging and different staining solutions

Document Type : Original Article

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1 Fixed prosthodontics, faculty of dentistry, Ahram Canadian University, Giza, Egypt

2 Fxed prosthodontics, faculty of dentistry, Ahram canadian university,Giza, Egypt

Abstract

Objectives: To investigate the color stability and translucency of zirconia-reinforced lithium silicate glass-ceramic (ZLS) prepared with different surface finishing procedures after thermo-mechanical aging and immersion in different beverages.
Sixty samples were fabricated from heat-pressed and milled ZLS. All samples were finished and divided into three groups (n=20), according to the finishing methods; (CD) polished and fired, (CD) glazed and fired, and (CP) glazed and power fired. The specimens were subjected to aging using chewing simulator integrated with thermocycling protocol. Then, each group was divided into 4 equal subgroups (n = 5) according to exposure to immersion medium (coffee, tea, Coca-Cola and distilled water). Color and translucency parameter (TP) were measured according to CIELAB color space using spectrophotometer at baseline and after subjecting the specimens to aging and different staining solutions. Changes in color (ΔE) and TP (ΔTP) were calculated. The data was analyzed using the analysis of variance (ANOVA) and Tukey’s post hoc test (p < 0.05).
Aging and staining significantly affected the baseline color and decreased TP of all specimens. Generally, regarding the tested groups, CD polished showed the highest ΔE and ΔTP (p <0.05). Coffee had the most significant effect on ΔE (p < 0.05). For each staining solution subgroup, polished CD had the highest ΔE.
Conclusions: Aging and staining beverages had a significant effect on color stability and decreased translucency of all surface finished ZLS. Polished celtra duo showed the highest ΔE and ΔTP. Coffee had the most significant effect on the color change of all surface finished ZLS.

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