Optical properties, biaxial flexural strength, and reliability of new-generation lithium disilicate glass-ceramics after thermal cycling.

Türksayar, Almira Ada Diken; Demirel, Münir; Donmez, Mustafa Borga (2023). Optical properties, biaxial flexural strength, and reliability of new-generation lithium disilicate glass-ceramics after thermal cycling. Journal of prosthodontics, 32(9), pp. 815-820. Wiley 10.1111/jopr.13632

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PURPOSE

To investigate the color stability, translucency, biaxial flexural strength (BFS), and reliability of nano-lithium disilicate and a fully crystallized lithium disilicate after thermal cycling and to compare with those of a commonly-used lithium disilicate.

MATERIAL AND METHODS

Three lithium disilicate glass-ceramics were used to prepare disk-shaped specimens (ø:12 mm, thickness: 1.2 mm) from 3 A2 shaded HT lithium disilicate glass-ceramics (Amber Mill, AM; Initial LiSi Block, IN; IPS e.max CAD, EX). AM and EX specimens were crystallized and all specimens were polished with a polishing paste (Diamond Polish Mint). A spectrophotometer (CM-26d) was used to measure color coordinates before and after thermal cycling. BFS test was performed after thermal cycling. Color differences (ΔE00 ) and relative translucency parameter (RTP) values were calculated. One-way analysis of variance (ANOVA) (ΔE00 and BFS), 2-way ANOVA followed by Tukey HSD tests (RTP), and chi-square tests (Weibull modulus and characteristic strength) were used for the statistical analyses (α = .05).

RESULTS

No significant differences were observed among the ΔE00 values of tested materials (df = 2, F = 2.933, P = .070). RTP values were only affected by material type (P<.001) as AM had the highest RTP (P<.001), while IN and EX had similar values (P≥.165). BFS values varied among tested materials (df = 2, F = 21.341, P<.001). AM and EX had similar BFS values (P = .067) that were higher than that of IN (P≤.001). Weibull moduli of the materials were similar (P = .305). whereas EX had the highest and IN had the lowest characteristic strength values (P<.001) CONCLUSIONS: While nano-lithium disilicate had the highest translucency, all materials had imperceptible color and translucency changes after thermal cycling when reported threshold values were considered. Newly introduced lithium disilicate glass-ceramics had adequate flexural strength as compared to the precursor material. This article is protected by copyright. All rights reserved.

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