In this study, we investigated water sorption of dual-curable adhesive cements. Water sorption, solubility and diffusion coefficients were determined on seven commercial dual-curable adhesive cements. The water sorption of five discs of each material were measured after immersion in 37°C water daily over the first seven days, weekly over the next three weeks and monthly thereafter until three months. After the three months immersion the specimens were dried in desiccator. Solubility were determined from the change of weight before immersion and after drying. True water sorption values at three months were obtained by adding the solubility values to the corresponding water sorption values at three months. Diffusion coefficients in dual-curable adhesive cements were obtained using Crank's method.
The results were indicated as follows;
1. Diffusion coefficients of water in dual-curable adhesive cements were smaller than those in dental composites.
2. Linear regression was not attained between filler content and water sorption.
3. Linear regression was attained between solubility and diffusion coefficient. It is suggested that diffusion coefficient is important factor for durability of dual-curable adhesive cements.
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