Three-dimensional investigation of the accuracy of impression materials after disinfection

The influence of the two new disinfection systems Hygojet/MD 520 and Impresept on the accuracy of eight impression materials was evaluated with a clinically relevant abutment arrangement. In addition, an "aseptic" irreversible hydrocolloid was tested under the same test conditions but without the disinfection procedure. The dimensional changes of all eight impression materials related to the disinfection procedures were small. Although statistically significant interactions of the impression materials and the disinfection systems were found, the influence of the two tested disinfection systems on the dimensional accuracy of the impressions does not seem to be clinically relevant. From the standpoint of impression accuracy, both tested disinfection systems and the tested "aseptic" irreversible hydrocolloid can be recommended for clinical and laboratory use.