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

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 (75 vol%) 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 degrees 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 (R) saliva follows and finally the heptane solvent. (C) 2015 Academy of Dental Materials. Published by Elsevier Ltd. All rights reserved.