Effect of Plastic Impression-Transfer Copings on the Dimensional Accuracy of Implant Impressions

Objective: The purpose of this in vitro study was to evaluate the effect of plastic impression-transfer copings on the dimensional accuracy of close tray implant impressions. Material and Methods: A master model consisting of acrylic main material was created. Five parallel holes were drilled for the analogs. Special measuring spoons were prepared for the models created with self-hardening polymethyl methacrylate resin. Our research consisted of 2 groups. The first group consisted of five parts and the impression was taken using the Implant Plastic impression-transfer part coping method. The second group, on the other hand, consists of five parts, and this time measurements were taken without using the Plastic impression-transfer coping method. Vinylpolysiloxane impression material was used for both groups. At the end of the impression process, plaster models were made with type IV calculus. The plaster models were scanned with laboratory-type scanner and recorded in the measurement program. To create a standard operation between the groups, measurements were made of each analog from a certain reference point. Measurement results were recorded in millimeters and pairwise comparisons were made using Welch's t-test analysis. Results: How the plastic impression caps affect the measures was concluded by applying the t-test to each point. The deterioration in the measurements taken with the cap was lower for all distances compared to the measurements taken without the cap, but the difference was not significant (p>0.05). Conclusions: While the distortions seen in the right and left measured intervals were found as the expansion type, the distortions in the posterior and anterior intervals were determined as the compression type. Although there are dimensional changes in the measurements taken without the use of a cap, the findings were not found to be clinically significant. © 2023.