Full arch digital scanning systems performances for implant-supported fixed dental prostheses: a comparative study of 8 intraoral scanners

Purpose: Compare the accuracy of intraoral digital impression in full-arch implant-supported fixed dental prosthesis acquired with eight different intraoral scanner (Ios). Methods: A polymethyl methacrylate acrylic model of an edentulous mandible with six scan-abutment was used as a master model and its dimensions measured with a coordinate measuring machine. Eight different Ios were used to generate digital impression: True Definition, Trios, Cerec Omnicam, 3D progress, CS3500, CS3600, Planmeca Emelard and Dental Wings. Fifteen digital impressions were made. A software called "Scan-abut" was developed to analyse and compare the digital impression with the master model, obtaining the scanning accuracy. The three-dimensional (3D) position and distance analysis were performed. Results: Mean value of the 3D position analysis showed that the True Definition (31 mu m +/- 8 mu m) and Trios (32 mu m +/- 5 mu m) have the best performance of the group. The Cerec Omnicam (71 mm +/- 55 mm), CS3600 (61 mu m +/- 14 mu m) have an average performance. The CS3500 (107 mu m +/- 28 mu m) and Planmeca Emelard (101 mu m +/- 38 mu m) present a middle-low performance, while the 3D progress (344 mu m +/- 121 mu m) and Dental Wings (148 mu m +/- 64 mu m) show the low performance. The 3D distance analysis showed a good linear relationship between the errors and scan-abutment distance only with the True Definition and CS3600. Conclusions: Not all scanners are suitable for digital impression in full-arch implant-supported fixed dental prosthesis and the weight of the output files is independent from the accuracy of the Ios. (C) 2019 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.