@article { author = {Afshari, Zahra and Ghoveizi, Rahab and Moein, Layla and Shamali, Mahdi and Tavakolizadeh, Sara}, title = {Dimensional accuracy of three impression materials by one-step and two-step impression techniques: An in vitro study}, journal = {Journal of Dental Materials and Techniques}, volume = {9}, number = {1}, pages = {36-42}, year = {2020}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2020.43747.1314}, abstract = {Introduction: An accurate impression is essential to create a well-fitted dental prosthesis. This study aimed to compare the dimensional accuracy of three elastomeric materials using one-step and two-step impression techniques. Methods: In this study, 20 impressions were fabricated for each Vinyl siloxane ether (Identium), condensation silicone (Speedex), and additional silicone (Panasil) impression materials by the one-step and two-step impression techniques using perforated metal trays. The one-step impression technique was simultaneously performed with heavy body/light-body materials. In the two-step impression technique, acrylic copings with 2-mm thickness were placed on the abutments to obtain similar spacing for the light-body material. The dimensional accuracy of different impression materials and techniques were measured using distance differences of the stone dies from the master cast; subsequently, the results were compared with the reference model. Data were analyzed using a one-way analysis of variance and Dunnett’s tests (α=0.05). Results: All impression materials demonstrated an acceptable clinical accuracy. Identium (Vinyl siloxane ether) displayed the most accuracy in both the one-step and two-step impression techniques (P>0.05). The best accuracy for Panasil (additional silicone) was found to be the two-step impression technique (P>0.05), and the best accuracy for Speedex (condensation silicone) was reported as the one-step impression technique (P>0.05). Furthermore, the one-step impression technique was highly accurate in diameter dimension, as compared to the two-step impression technique. Conclusion: As evidenced by the results, the accuracy of impression is affected by the impression materials. Moreover, Identium (Vinyl siloxane ether) demonstrated the most accuracy in both one-step and two-step impression techniques.}, keywords = {Dental Impression Materials,Dental Impression Technique,Silicone,Dimensional Accuracy}, url = {https://jdmt.mums.ac.ir/article_14712.html}, eprint = {https://jdmt.mums.ac.ir/article_14712_d020a2b2626bd1fde2078638ec919770.pdf} }