A comparative evaluation of accuracy of three impression techniques in parallel and angulated multiple implant impressions: An in vitro study

Abstract

Introduction: Dental implants have become the treatment of choice in many situations where missing teeth require functional and esthetic replacements. The present study was conducted to evaluate and compare the accuracy of multiple implant impressions using different impression techniques such as open tray nonsplinted, open tray splinted, and closed tray in both parallel as well as angulated implants.Materials and Methods: Two acrylic models were fabricated with four implant analogs placed in each model. Three impression groups, Group 1 (open-tray nonsplinted technique), Group 2 (open -tray splinted technique), and Group 3 (closed tray technique) were formed for each model. The post hoc Tukey's test was used for multiple comparisons.Results: The results show that Group 3 is least accurate after that, Group 1 and Group 2 are most accurate techniques for impression making.Conclusions: These results indicate that the open-tray (pickup) impression technique is more accurate as compared to the closed tray (reposition) technique in both Model A (parallel analogs) and Model B (angulated analogs).