Leven Robert, Schmidt Alexander, Binder Roland, Kampschulte Marian, Vogler Jonas, Wöstmann Bernd, Schlenz Maximiliane Amelie
Department of Prosthodontics, Dental Clinic, Justus Liebig University, Schlangenzahl 14, 35392 Giessen, Germany.
Dental Laboratory Dental Team, Hauptstrasse 20, 92237 Sulzbach-Rosenberg, Germany.
Materials (Basel). 2022 Jun 13;15(12):4199. doi: 10.3390/ma15124199.
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.
目前的口腔内扫描仪（IOS）能够直接获取印模，用于计算机辅助设计/计算机辅助制造（CAD/CAM）桩核（P+C），随后从整体材料中铣削出来。本体外研究的目的是在全数字工作流程中，系统地研究CAD/CAM-P+C的准确性，考虑不同的IOS印模方法（Primescan（PRI）、不带扫描桩的Trios4（TRI）和带扫描桩的Trios4（TRI+SP））（A部分），以及氧化锆（ZIR）和树脂复合材料（COM）-P+C的CAD/CAM铣削（B部分）。本研究制作了5个人体模型。使用微型计算机断层扫描成像作为参考（REF）。对于A部分，每种印模方法对模型进行12次扫描。然后，将IOS数据集（n = 180）与REF叠加，并使用3D软件（GOMInspect）确定扫描精度。对于B部分，针对每个模型、印模方法和材料铣削一个CAD/CAM-P+C（n = 30）。使用工业扫描仪（ATOS）应用三重扫描方法来确定贴合精度。使用方差分析（ANOVA，p < 0.05）进行统计分析。A部分显示PRI的精度显著低于TRI和TRI+SP（p < 0.05）。B部分的数据显示ZIR的精度显著高于COM（p < 0.05）。在本研究的局限性内，就贴合精度而言，可推荐在全数字工作流程中使用ZIR的CAD/CAM-P+C进行制作。
