Evaluation of Elastomeric Impression Techniques and Tray types on Dimensional Accuracy of First and Second-Pour Dental Stone Casts: An In Vitro Study

Dr. Himabindu Ravella, Dr. Gnana Sruthi Mayakuntla

Abstract: Aim: To assess the dimensional accuracy of first- and second-pour dental stone models fabricated from four impression techniques using metal and plastic stock trays. Materials and Methodology: Measurement-specified Stainless steel dies (ADA no. 19) simulating tooth preparations was mounted in a typodont teeth set. Polyvinylsiloxane impressions were made with "One-step", "Two-step", "Monophase", and "New Two-step techniques", in combination with metal and plastic full-arch and dual-arch trays. First- and second-pour casts were evaluated using a Coordinate Measuring Machine (CMM) to measure changes in mesiodistal width and occlusogingival height relative to the master dies. Results: Statistical analysis (One-way ANOVA, t-tests, two- and three-way ANOVA) have been done to analyze the study data. The New Two-step technique exhibited the least difference in the dimensions of casts than other techniques. Resultant casts from impressions made with Metal trays showed the slightest difference in dimensions compared to Plastic trays. The p-values (p < 0.05) from statistical analysis shows that width and height significantly differed in values for the Monophase technique and Plastic trays between first and second pour casts. Conclusion: The "New Two-step technique" yielded accurate working casts among the impression methods tested. Metal full-arch trays provided greater accuracy than plastic trays. First-pour casts demonstrated better dimensional accuracy than second-pour casts.

Keywords: Impression trays, Impression techniques, Dental stone casts, Dimensional accuracy

How to Cite?: Dr. Himabindu Ravella, Dr. Gnana Sruthi Mayakuntla, "Evaluation of Elastomeric Impression Techniques and Tray types on Dimensional Accuracy of First and Second-Pour Dental Stone Casts: An In Vitro Study", Volume 14 Issue 10, October 2025, International Journal of Science and Research (IJSR), Pages: 1327-1332, https://www.ijsr.net/getabstract.php?paperid=SR251022141525, DOI: https://dx.doi.org/10.21275/SR251022141525