Accuracy of Digital Impression Taking with Intraoral Scanners and Fabrication of CAD/CAM Posts and Cores in a Fully Digital Workflow

Materials

Roland Binder¹  Marian Kampschulte²  Maximiliane Amelie Schlenz³  Alexander Schmidt³  Jonas Vogler³  Robert Leven³  Bernd Wöstmann³ 

[1] Dental Laboratory Dental Team, Hauptstrasse 20, 92237 Sulzbach-Rosenberg, Germany;Department of Diagnostic and Interventional Radiology, University Hospital, Justus Liebig University, Schubertstrasse 81, 35392 Giessen, Germany;Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392 Giessen, Germany;

关键词: post and core technique;    digital dentistry;    cad-cam;    intraoral scanner;    monolithic materials;    digital workflow;   

DOI  :  10.3390/ma15124199

来源: DOAJ

【 摘 要 】

Current intraoral scanners (IOS) enable direct impression taking for computer-aided de-sign/computer-aided manufacturing (CAD/CAM) posts and cores (P+C) with subsequent milling out of monolithic materials. The aim of this in vitro study was to systematically investigate the accuracy of CAD/CAM-P+C in a fully digital workflow, considering different IOS impression methods (Primescan (PRI), Trios4 without (TRI) and with scanpost (TRI+SP)) (Part A), and CAD/CAM milling of zirconium dioxid (ZIR) and resin composite (COM)-P+C (Part B). Five human models were developed in this study. Micro-CT imaging was used as a reference (REF). For Part A, the models were scanned 12 times for each impression method. Then, IOS datasets (n = 180) were superimposed with REF, and scan accuracy was determined using 3D software (GOMInspect). For Part B, one CAD/CAM-P+C (n = 30) was milled for each model, impression method, and material. The triple-scan method was applied using an industrial scanner (ATOS) to determine the accuracy of the fit. Statistical analysis was performed using analysis of variance (ANOVA, p < 0.05). Part A showed for PRI significantly lower accuracy than TRI and TRI+SP (p < 0.05). The data of Part B revealed significantly higher accuracy for ZIR than for COM (p < 0.05). Within the limitations of this study, CAD/CAM-P+C of the ZIR can be recommended for fabrication in a fully digital workflow regarding the accuracy of fit.

【 授权许可】

Unknown