European Journal of Prosthodontics and Restorative Dentistry

Effect of Repeated Firings on Color Stability of Zirconia Reinforced Lithium Silicate and Lithium Disilicate Ceramics

Effect of Repeated Firings on Color Stability of Zirconia Reinforced Lithium Silicate and Lithium Disilicate Ceramics

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Cover Date

December 2024

Print ISSN

0965-7452

Electronic ISSN

2396-8893

Vol

32

Issue

4

Abstract

Purpose: The purpose of this invitro study was to assess the changes in the color attributes of high-translucency (HT) lithium disilicate and zirconia-reinforced lithium silicate in BL3/0M1, A1, A2, and A3 shades during first, second, and third firing cycles. Materials and Methods: Eighty specimens of two ceramic systems (IPS e.max CAD and Vita Suprinity) in BL3/0M1, A1, A2, and A3 shades, were prepared in thickness of 1 mm (n=10). Each group was subjected to 3 firing cycles and the CIE L*a*b* color parameters of specimens were measured after each firing cycle by a reflectance spectrophotometer. The color change (∆E) between each two firing cycles was calculated by the relevant equation. Data were analyzed by one-way ANOVA and Tamhane post hoc test. Results: All ∆E values
were significant (P<0.001) except for ∆E2-1 (color difference between second and first firing) and ∆E3-2 (color difference between third and second firing) in A2 shade of IPS e.max (P=0.436) and ∆E2-1 and ∆E3-2 in 0M1 shade of Suprinity (P=0.345). Conclusion: Repeated firing resulted in generally higher ∆E in ZLS than LDS, and 0M1 Suprinity experienced maximum ∆E after repeating firing.

Keywords
Lithium Disilicate
Zirconium Oxide
Computer-Aided Design
Color