Effect of Food-Simulating Liquids on the Hydrolytic Behavior of Resin Matrix Ceramics.

Abstract

Purpose: To evaluate the hydrolytic behavior of different CAD/CAM resin matrix ceramics (RMCs) in different food-simulating liquids (FSLs).

Materials and methods: Five different CAD/CAM blocks, one from a polymer-infiltrated ceramic network (PICNs; Vita Enamic [EN]) and four from resin-based composites (RBCs; Lava Ultimate [UL], Cerasmart [CER], Brilliant Crios [BR], and Block HC [HC]) were selected. In total, 40 specimens were prepared for each material, and they were randomly distributed to each FSL. The specimens were initially kept in a desiccator, then placed in 5 mL of liquid at 37°C ± 1°C for 30 days, and weighed at various time intervals. Percentage mass change (Mg%), sorption (SP), percentage of liquid absorbed (SP%), solubility (SL), percentage solubility (SL%), and percentage of liquid absorbed by the polymer matrix (SPpm) were evaluated. Significance was evaluated at P < .05.

Results: Hydrolytic behavior of the materials showed statistical differences in terms of SP, SL, SP%, and SL% values depending on the liquid environment (P = .001). The highest SP values were obtained from the HC material in saliva, and the lowest values were obtained from the BR in ethanol. The highest SL values were obtained from the CER and EN in heptane, and the lowest values were obtained from the HC in ethanol. However, all results detected in the study remained below the ISO threshold values.

Conclusions: All materials tested exhibited clinically acceptable hydrolytic behavior over the time tested. In addition to material content, many factors can affect the hydrolytic behavior.