Abstract
Introduction: An exact impression of dental and dentoalveolar structures is a significant and fundamental prerequisite for the exact fixture of the prosthesis. The advancement of the prosthesis with respect to fit, accuracy, and long life are dependent upon the impression materials, the strategies utilized, and the duration of time of pouring the impression.
 Aim: Compare and Evaluate the Dimensional Accuracy of One-Step versus Two-Step Putty Wash Impression Techniques Using Two Different Commercially Available Addition Silicone Elastomeric Impression Materials.
 Methodology: Impressions were made of a metal die having reference lines on it, by one-step wash impression technique and two-step impression technique. After making the impression, impression was allowed to set for 1 hour and then poured in Zhermack die stone. Die stone was allowed to set. Stone dies were obtained from each group. Metal die and stone dies from each group were assessed under stereo microscope 10x zoom using reference lines.
 Results: When compared to a one-step putty wash impression approach, a two-step putty wash impression process was more reliable. Comparing Virtual (Ivoclar Vivadent, USA) addition polyvinyl siloxane impression material to Aquasil (Dentsply, Germany), it was discovered that it was more accurate. Based on the findings, it has been determined that Ivoclar Vivadent Virtual addition silicone is more precise than Zhermack Aquasil addition silicone and that two-step putty wash impression method is more accurate than one-step putty wash impression method.
 Conclusion: Inside impediments of this study the following outcomes were drawn that two-stage clay wash impression method is more precise when contrasted with one stage clay wash impression strategy with a spacer of 1 mm for light body consistency expansion polyvinyl siloxane impression material. And The Ivoclar Vivadent Virtual expansion polyvinyl impression material showed more exactness when contrasted with Zhermack Aquasil expansion polyvinyl impression material utilizing one stage and two-stage clay wash impression strategies.
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