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Accuracy of various impression materials and methods for two implant systems: An effect size study
Alexander Schmidt1, Teresa Häussling1, Peter Rehmann1
1Justus-Liebig-University, Dental Clinic, Department of Prosthodontics, Giessen, Germany.
Journal of Prosthodontic Research
|December 2, 2017
Summary
Polyvinyl siloxane impression materials offer superior accuracy for dental implant restorations. This study found material choice significantly impacts precision, especially for angled implants, highlighting its importance in multiunit cases.
Area of Science:
- Dental materials science
- Prosthodontics
- Biomaterials engineering
Background:
- Accurate impressions are critical for successful dental implant restorations.
- Evaluating factors influencing impression accuracy is essential for clinical success.
Purpose of the Study:
- To determine the effect size of impression material, implant system, and angulation on impression transfer precision.
- To compare the accuracy of different impression materials and techniques in an in-vitro setting.
Main Methods:
- Utilized a maxilla model with BEGO and Straumann implants at varying angulations (0°, 15°, 20°).
- Examined polyether and polyvinyl siloxane materials with open and closed tray techniques.
- Measured 3D shift, implant axis inclination, and rotation using a coordinate measurement machine and analyzed with four-way ANOVA.
Main Results:
- Impression material significantly influenced 3D shift and implant axis inclination, with large effect sizes.
- Polyvinyl siloxane materials demonstrated the highest transfer precision.
- Increased implant angulation led to greater deviations in implant axis rotation.
Conclusions:
- Impression material exerts the most significant effect on the accuracy of 3D shift and implant axis inclination.
- Polyvinyl siloxane materials are recommended for multiunit restorations with disparallel implants.
- Reporting effect size in multivariate investigations is crucial for understanding clinical significance.
