[Study on the disinfection of alginate impressions. 2. Dimensional stability and surface roughness after immersing or spraying treatment with povidone-iodine solution].

The dimensional changes of four alginate impression materials and the surface roughness of stone casts following the treatment with 0.07% Povidone-Iodine solution were evaluated. The impressions were treated by either immersing or spraying. The dimensional change was measured by an electronic micrometer with a non-pressure direct method for 60 minutes. The surface roughness of stone casts obtained from the impressions following optimal treatment was also measured. Two products were dimensionally stable for 60 minutes after spraying with the solution, while the other two were stable for 30 minutes in the solution. No effect of the treatment was observed on the surface roughness of stone casts.