The Journal of prosthetic dentistry · 2025
Effect of food-simulating solvents on the stainability and mechanical properties of partially and fully crystallized lithium disilicate glass-ceramics.
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Al-Johani Hanan, Bukhari Asmaa, Abduo Jaafar, Sulaiman Taiseer
Аннотация
STATEMENT OF PROBLEM: The effect of food-simulating solvents (FSSs) on the staining susceptibility and mechanical properties of partially and fully crystallized lithium disilicate glass-ceramics (LDGCs) remains unclear.
PURPOSE: The purpose of this in vitro study was to evaluate the color change, hardness, flexural strength, and reliability of LDGCs exposed to FSSs.
MATERIAL AND METHODS: Two machinable LDGCs, partially crystallized (IPS e.max CAD, EC) and fully crystallized (Initial LiSi Blocks, LS) (n=120), were assigned to different FSS groups: artificial saliva, citric acid, or ethanol. Color coordinates were obtained using a spectrophotometer, and the color stability (ΔE00) was computed using the CIEDE2000 color difference formula. Martens hardness (HM) data were acquired from a hardness testing machine, and biaxial flexural strength (σ) was measured with a universal testing machine. Characteristic strength (σ0) and reliability (m̂U) were computed by Weibull analysis. Data for ΔE00, HM, and σ were analyzed by 2-way ANOVA, Tukey HSD, Student t tests, and Pearson correlations (α=.05).
RESULTS: LDGC material type, FSS treatment, and their interaction had a significant effect on ΔE00, HM, and σ (P≤.024). Considering published ΔE00 thresholds, EC and LS had perceptible color changes after ethanol immersion, and LS had unacceptable color changes after citric acid immersion. Citric acid had a stronger harmful effect on LS than EC for all outcomes (P<.010). Higher σ0 and m̂U were verified in EC across all FSS groups (P<.001).
CONCLUSIONS: Fully crystallized LDGC displayed color stability similar to that of partially crystallized LDGC after accelerated artificial saliva aging; however, acidic FSSs negatively impacted fully crystallized LDGC's colorimetric and mechanical properties to a greater degree.
PURPOSE: The purpose of this in vitro study was to evaluate the color change, hardness, flexural strength, and reliability of LDGCs exposed to FSSs.
MATERIAL AND METHODS: Two machinable LDGCs, partially crystallized (IPS e.max CAD, EC) and fully crystallized (Initial LiSi Blocks, LS) (n=120), were assigned to different FSS groups: artificial saliva, citric acid, or ethanol. Color coordinates were obtained using a spectrophotometer, and the color stability (ΔE00) was computed using the CIEDE2000 color difference formula. Martens hardness (HM) data were acquired from a hardness testing machine, and biaxial flexural strength (σ) was measured with a universal testing machine. Characteristic strength (σ0) and reliability (m̂U) were computed by Weibull analysis. Data for ΔE00, HM, and σ were analyzed by 2-way ANOVA, Tukey HSD, Student t tests, and Pearson correlations (α=.05).
RESULTS: LDGC material type, FSS treatment, and their interaction had a significant effect on ΔE00, HM, and σ (P≤.024). Considering published ΔE00 thresholds, EC and LS had perceptible color changes after ethanol immersion, and LS had unacceptable color changes after citric acid immersion. Citric acid had a stronger harmful effect on LS than EC for all outcomes (P<.010). Higher σ0 and m̂U were verified in EC across all FSS groups (P<.001).
CONCLUSIONS: Fully crystallized LDGC displayed color stability similar to that of partially crystallized LDGC after accelerated artificial saliva aging; however, acidic FSSs negatively impacted fully crystallized LDGC's colorimetric and mechanical properties to a greater degree.