Effect of digital workflow on the marginal fit of long-span implant-supported bars for kennedy ii class removable prostheses in vitro
| Autor: | Nikolaos Polychronakis, H.C. Karkazis, Gregory L. Polyzois, Aristeidis Villias, Triantafillos Papadopoulos |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | STOMATOLOGY EDU JOURNAL. 8:33-44 |
| ISSN: | 2502-0285 2360-2406 |
| DOI: | 10.25241/stomaeduj.2021.8(1).art.4 |
| Popis: | Introduction The production procedures, including impressions, introduce errors affecting the passivity of fit. A completely digital workflow is possible nowadays because of the intraoral scanners (IOS). This study aimed to evaluate the effect of the impression technique (conventional versus digital) and the screw tightening sequence on the marginal discrepancy (MD) of implant-supported bars. Methodology This laboratory study was conducted on a simulated Kennedy class II edentulous maxilla with three parallel implants in the edentulous quartile. The closed tray technique with a-silicon (CTM) and the intraoral scanning with the I-Tero™ system (IOS) were compared and three bars were manufactured from each technique. Depending on the screw tightening sequence (A11 and A17) 4 groups were created with 6 samples each. The MD was examined implementing 24 negative replicas, which were sectioned and studied under a stereomicroscope. The Horizontal Discrepancy (BHD), Vertical Discrepancy (BVD) and Conical Discrepancy (BCD) of the bar were calculated on the means of the measurements of the horizontal, the vertical and the conical MD respectively. The descriptive statistics, normality tests, one-way ANOVA (a=.05) and post-hoc Tukey’s tests were run and the graphs were draw with SPSS. Results There was a significant effect (P |
| Databáze: | OpenAIRE |
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