Abstract
As part of our study about the disinfection of impressions in dental treatment of elderly patients at home, the present study investigated the effect of immersion disinfection of alginate impressions on the dimensional accuracy and deformation of edentulous working casts in relation to the W/P ratio of alginate impression materials. Two types of alginate impression material : AROMA FINE DF III (AF III) and Jeltrate Plus (JLP), characterized by smaller or greater dimensional changes in water, were used. Impression materials were mixed at the following W/P ratio : manufacturers' instructions (std), std-0.2, and std+0.4. Impressions were immersed in 1% sodium hypochlorite solution for 10 min (1 SH), 2% glutaraldehyde solution for 30 min (2 GA), or they were not immersed in any disinfectant solutions as a control. The W/P ratio had no effect on the dimensional accuracy and deformation of edentulous working casts obtained from AF III impression disinfected by 1 SH processing.