Dental impression materials are frequently contaminated with microorganisms from saliva and blood, posing a risk of cross-contamination during the fabrication of stone models. Tomitigate this risk, the FDI World Dental Federation (1998) recommended thorough cleaning and disinfection of all impression materials.

To evaluate and compare the elastic recovery of four different elastomeric impression materials following chemical disinfection and autoclaving.

A total of 60 specimens were prepared, with 15 specimens allocated to each material: polysulfide (Orikam, India), polyether (3M ESPE Monophase, USA), condensation silicone (Zhermack Zetaplus, Italy), and addition silicone (Ivoclar Vivadent, Liechtenstein).

Each material group was further divided into three subgroups (n = 5):Chemical disinfection, Autoclaving, Control (no treatment). Elastic recovery of all specimens was measured using a universal testing machine.

No statistically significant differences in elastic recovery were observed among the materials following chemical disinfection or autoclaving. All tested materials demonstrated comparable elastic recovery under the evaluated conditions.

Within the limitations of this study, chemical disinfection and autoclaving did not significantly affect the elastic recovery of the tested elastomeric impression materials. All materials exhibited comparable performance after sterilization procedures.

Addition silicone impression materials, autoclave cycle, chemical disinfection, sterilization, Universal Testing Machine.