Sorption characteristics of oral/food simulating liquids by the dental light-cured nanohybrid composite Kalore GC

Abstract

Objective: This work presents the results obtained from the study of sorption/desorption process of some food/oral simulating liquids (FSLs) by the new marketed dental light-cured nanohybrid composite Kalore GC.

Methods: The sorption/desorption process followed is recommended by ISO 4049:2009. The samples were immersed in various liquids proposed by ADA as FSLs, such as H2O, artificial saliva, EtOH, EtOH/H2O solution (75vol%) or C7H16, while the mass change for totally 30 days was recorded on defined time intervals. Afterwards the samples were put in dry desiccators at 37°C for the study of desorption process.

Results: The weight percentage of sorption of the above mentioned FSLs by Kalore GC was determined; also the wt% of the desorbed liquid, the diffusion coefficient of sorption and desorption, the wt% solubility and the % volume increase due to the liquid sorption.

Significance: The sorption characteristics of a dental composite depend both on composite structure and liquid. Ethanol/water and ethanol showed the highest effect on the determined characteristics. Then, the water and SAGF(®) saliva follows and finally the heptane solvent.

Keywords: Desorption; Diffusion coefficient; Food/oral simulating liquids; Kalore GC; Solubility; Sorption.