The impact of impression coping geometrical design on accuracy of implant impressions: an experimental study

Purpose A high transfer accuracy of the intraoral implant position to a model is required, to manufacture implant-supported restorations. However, clinically relevant deviations persist between the intraoral implant position and the model obtained, even for the benchmark conventional custom implant impressions with polyether. Thus, new approaches using 3-D printed impression trays may increase the transfer accuracy of implant impressions. The ability to adjust parameters such as the thickness of the layers and the influence of the openings in the impression tray could potentially affect accuracy. Methods Four different types of impression trays (n = 10 for each group) for the conventional impression technique were investigated: conventional custom impression tray, customized foil tray, chairside 3-D printed impression tray with the SHERA system, and the Primeprint system using an implant master model with four implants in the posterior region and a reference cube. After plaster model casting, all models were measured using a coordinate measuring machine, and the deviation from the reference dataset was determined. A statistical ANOVA analysis was performed (p < 0.05). Results Chairside 3-D printed impression trays showed the best results, followed by conventional custom impression trays. Implant impressions obtained using a customized foil tray exhibited the lowest accuracy. Statistically significant differences were observed between 3-D printed impression trays and conventional custom impression and customized foil trays (p < 0.05). Whereas, the implant position did not have any significant influence on accuracy (p > 0.05). Conclusions Chairside 3-D printed impression trays significantly increase the transfer accuracy for implant impression taking. Graphical Abstract

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Evaluation of stability of Short Hybrid Implant Impression Copings: A Finite Element Analysis

Sun,

Yoo,

Jeong

et al. 2024

Preprint

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Objectives. This study evaluates the stability of various short hybrid impression copings with pick-up plastic components compared to conventional impression copings. Materials and Methods. Three-dimensional (3D) models were created using three different impression coping types (transfer, short hybrid [SH] with cap, and SH without cap) in two diameters (4.00 mm and 5.00 mm). An external horizontal load was applied to the apex of the analog to simulate unintentional forces under diverse conditions. Von Mises stress, microstrain, and displacement values were calculated to assess the stability of each group. Each group underwent a single simulation, and a Tukey post hoc test was conducted for statistical analysis. Results. The finite element analysis (FEA) results demonstrated that SH copings with a pick-up component showed significantly lower stress and deformation in the PVS material under unintended force application. Significant differences were observed among all groups (p < 0.01). Conclusions. Short hybrid implant copings with a pick-up cap provide reliable impression accuracy comparable to conventional transfer copings, with consistent reproducibility. Clinical Relevance Achieving precision and stability in dental implant impression techniques is essential for the accurate replication of intraoral conditions. Modifications to impression coping caps by some implant manufacturers have been introduced to enhance the ease of transfer and repositioning in clinical practice. In this study, the stability of impression copings with pick-up plastic components is evaluated using finite element analysis, providing insights into their clinical effectiveness.

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The impact of impression coping geometrical design on accuracy of implant impressions: an experimental study

Cited by 4 publications

References 23 publications

Comparison of the accuracy of impressions made of 2 implants with interfering axial convergence with CAD-CAM impression copings and the altered cast technique: An in vitro study

Comparison of the accuracy of impressions made of 2 implants with interfering axial convergence with CAD-CAM impression copings and the altered cast technique: An in vitro study

Chairside 3-D printed impression trays: a new approach to increase the accuracy of conventional implant impression taking? An in vitro study

Evaluation of stability of Short Hybrid Implant Impression Copings: A Finite Element Analysis

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