Evaluation of Dimensional Stability in Four Types of Impression Materials Using Digital Analysis.

Background: Dimensional precision of casts is essential for the quality of fixed prosthesis therapy, with the impression technique being a crucial component affecting this precision. This in vitro study is to evaluate the dimensional precision of casts generated from four varieties of impression materials. Materials and Methods: Utilizing 20 specimens, four types of impression materials were fabricated and subsequently classified into four groups: condensation silicone impression material group (heavy and light body), condensation silicone impression material group (light body only), addition silicone impression material group (heavy and light body), and alginate impression material group. Dimensional stability was evaluated by acquiring imprints of an acrylic mold with three supports that replicate a slightly edentulous arch, which were then filled with stone. The stability was assessed by shooting photos with a Canon digital macro-lens camera, thereafter measuring the distances between the three posts using AutoCAD software (three lines were measured). Results: This study evaluated the dimensional precision of four frequently utilized impression materials in comparison to the primary standard. Dimensional accuracy was evaluated along three measurement lines, revealing substantial deviations from the standard for all materials ( Conclusion: In summary Although the digital technique may be more dependable and less complicated way to evaluate the qualities of impression materials, addition silicone heavy and light body demonstrated superior dimensional accuracy when compared with the other three impression materials. In contrast, among the four impression materials tested, condensation silicone heavy & light body had the largest dimensional shifts, indicating the lowest degree of dimensional accuracy.