Evaluation of Dimensional Stability of Elastomeric Impression Materials Subjected to Various Disinfection Methods: An In vitro Study

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Background: Disinfecting impressions is crucial to avoid cross-contamination from the operatory to the laboratory. Several methods have been used for this purpose, with the key consideration being that these methods should not alter the physical and mechanical properties of impression materials. The objective of this study was to evaluate the dimensional stability (DS) of elastomeric impression materials subjected to different disinfection methods. Materials and Methods: A custom-milled metal model was made simulating the dental arch with 4 cylinders labeled A, B, C, and D. Impressions were made with this die, and casts were poured. Custom trays were fabricated using light-cure acrylic material, and a total of 240 impressions were made with 80 from each of Poly Vinyl Siloxane, Vinyl Poly Ether Siloxane, and Polyether. The impressions were subjected to different disinfection methods: autoclave, Korsolex, and Bacillol disinfectants. Casts were poured at various time intervals, after 15 min, 24 h, 1 week, and 2 weeks. DS was evaluated using digital calipers by measuring the distance between the cast cylinders. A three-way variance analysis was conducted to analyze the obtained study data. Results: The dimensional changes in the three elastomeric materials were comparable after different disinfection methods at various intervals. Analysis of variance revealed significant differences in diameter AB/CD ( P = 0.002) across materials and in AC/BD ( P = 0.001) among methods. Significant differences were also found in diameter A/D ( P = 0.01), B/C ( P = 0.01), and distance B to C ( P = 0.015) across materials, methods, and durations. Conclusion: The impression materials subjected to different disinfection methods did not alter their DS.