Can Transfer Type and Implant Angulation Affect Impression Accuracy? A 3D in Vitro Evaluation

Overview

Journal Odontology

Specialty Dentistry

Date 2021 Jun 2

PMID 34075492

Citations 1

Authors

Davide Farronato

Pietro Mario Pasini

Veronica Campana

Diego Lops

Lorenzo Azzi

Mattia Manfredini

Affiliations

Soon will be listed here.

Abstract

Impression accuracy is fundamental to achieve a passive fit between implants and the superstructure. Three transfer types were tested to evaluate the differences in impression accuracy and their efficiency in case of different implant angles. A master model with four implant analogues placed at 0°, 15° and 35° was used. 27 impressions were taken with three different types of impression coping: closed tray technique coping (CT), open tray technique coping (COT) and telescopic open tray coping (TOT). The impressions were poured. Analogues were matched with scan bodies to be scanned and exported in STL. An implant bar was designed from each STL and another one from the master model. A comparison between these bars was obtained. Linear and angular measurements for every type of coping were calculated for different angulations. The collected data were analyzed with ANOVA test (95% of confidence). Student's t test showed a significative discrepancy (p ≤ 0.001) on linear and angular measurements on Δx, Δy, Δz with different transfer types as well as diverse implant positioning angles (p ≤ 0.001). Within the limitations of this study, it can be concluded that the coping type and the implants divergence may be significant parameters influencing the impression accuracy.

Citing Articles

Accuracy of multiple implant impressions using different combinations of impression materials using closed tray technique: An study.

Deshmukh M, Ahmed N, Maiti S, Rajaraman V J Adv Pharm Technol Res. 2023; 13(Suppl 2):S412-S415.

PMID: 36798542 PMC: 9926599. DOI: 10.4103/japtr.japtr_330_22.

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