The Effect of Different Acidic Beverages on the Chemical Solubility and Biaxial Flexural Strength of Lithium Disilicate Ceramics

Abstract

Aim: The aim of this study was to evaluate and compare two pressable lithium disilicate glass ceramic materials IPS e.max Press and initial LiSi Press provided by various manufacturers in terms of their flexural strength and acid resistance. Materials and Methods: Two lithium disilicate glass ceramic materials were used in this study: IPS e.max Press (e.max; Ivoclar Vivadent) and GC initial LiSi Press (LiSi; GC). A total of 42 discs were fabricated according to manufacturer`s instructions. Biaxial flexural strength and chemical solubility tests were conducted according to ISO 6872:2015 after being stored in orange drink, cola and artificial saliva. The biaxial flexural strength test was conducted using a universal testing machine. The chemical solubility test with acid was followed by analysis via measurement of the mass loss (µg/cm2). Results: Finally, the results were analyzed via one-way ANOVA (α = 0.05) and Bonferroni’s multiple comparison tests. There was no statistically significant difference between median chemical solubility of the two ceramic types. There was a statistically significant difference between chemical solubility of different immersion media. There was no statistically significant difference between mean biaxial flexural strengths of the two ceramic types. There was a statistically significant difference between mean biaxial flexural strength of different immersion media. Cola showed the highest solubility and least flexural strength. While the artificial saliva showed the least solubility and highest flexural strength.