Effect of Plastic impression transfer copings on the dimensional accuracy of implant impressions

Purpose: The purpose of this in vitro study was to evaluate the effect plastic impression transfer copings on dimensional accuracy close tray implant impressions. Methods: A master model constructed using autopolymerizing acrylic resin. Five parallel holes were drilled for analogs. Custom trays made with polymethyl methacrylate consisted 2 groups (n=5): (group 1) Impression obtained coping 2) without coping. Vinylpolysiloxane material used both groups. After obtained, casts by type IV dental stone. Casts scanned lab-type scanner and transferred measurement program. Measurements from a specific reference corner each analog ensure standardization. Data saved as millimeters pairwise comparisons Welch's t-test analysis. Results: caps evaluated applying distance. For all distances, distortion seen measurements taken cap is higher than cap, but no significant differences found (p>0.05). Conclusions: In anterior-posterior distortions compression type, right-left distances expansion-type. There change clinically found.