Behavior of hydrocolloid impression materials during disinfection for AIDS virus

: The aim of this study is to investigate the dimensional changes of hydrocolloid impression materials agar type and alginates, when they are placed in fluids for AIDS virus sterilization as Sterile pack, alcohol 75%, sodium chloride 10% and Cidex for 40 min. It was found out that when the hydrocolloids were placed in alcoholic and Sterile pack fluids a great deal of changes happened (contraction and shrinkage) that made the sterilization in them impossible. The percentage of linear extention and imbibition noticed in hydrocolloids when they were placed in sodium chlorides and Cidex solutions showed that sterilization in them is usually possible. The best way of sterilization is to make a gypsum model from the hydrocolloid impression and place it in the furnace for 30 min in 60 degrees C.