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Impact of Lithium Disilicate Ceramic Surface Modifiers and Resin Cement of Different Viscosities on Surface Roughness and Bond Strength after Artificial Aging: A SEM Assessment

A. Alshahrani, R.S. Alhamdan, R.T. Alsaqat, S. Alresayes, M. Q Al Rifaiy, B. Almutairi

Journal of Ceramic Science and Technology, Vol. 16, No. 1 (2025), pp. 37-44

DOI: 10.4416/JCST2024-00028

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Abstract

The impact of ceramic surface conditioners and resin cement with different viscosities on the surface roughness (Ra) and strength of the bond of dentin to lithium disilicate ceramics (LDC) at baseline and after aging has been investigated. Dentin and LDC discs were prepared. The discs were conditioned. Group 1: HFA+S, Group 2: SECP and Group 3: Er, Cr: YSGG. Ra and topographic analysis of conditioned discs was performed. Based on high and low viscosities, conditioned discs were bonded with dentin. Bonded samples with low and high viscosity underwent aging while others were not aged. SBS testing with a UTM machine was performed on both aged and non-aged samples and failure analysis was conducted. The means and SD for the SBS and Ra were analyzed using a one-way ANOVA and the Tukey post hoc tests. The maximum Ra score was obtained in specimens conditioned with HF acid-S. Group-2 samples (SECP) displayed the minimum value for Ra. The highest SBS values were attained by Group 1A (HF(S)+High) samples at baseline. The lowest SBS scores were presented by Group 2A (SECP+High) samples after thermal aging. The SBS of LDC is influenced by their microstructure obtained after surface conditioning. Long-term thermal aging causes a decrease in the mechanical performance of LDC discs bonded to dentin using high-viscosity resin cement.

Keywords

Lithium disilicate ceramics, viscosity, thermal aging, surface modification

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