Congruence between the meshes of a combined healing abutment-scan body system acquired with four different intraoral scanners and the corresponding library file: An in vitro analysis

• Published in: Journal of dentistry 2022-03, Vol.118, p.103938-103938, Article 103938
• Main Authors: Donmez, Mustafa Borga, Marques, Vinicius Rizzo, Çakmak, Gülce, Yilmaz, Hakan, Schimmel, Martin, Yilmaz, Burak
• Format: Article
• Language: English
• Subjects: Accuracy; CAD; Computer aided design; Dental Implants; Dental Impression Technique; Dentistry; Deviation; Digitization; Healing; Healing abutment-scan body; Imaging, Three-Dimensional; Inspection; Intraoral scanner; Libraries; Manufacturers; Microscopy; Models, Dental; Optical scanners; Qualitative analysis; Reverse engineering; Scanners; Software; Software engineering; Tessellation; Trueness
• ISSN: 0300-5712; 1879-176X
• DOI: 10.1016/j.jdent.2021.103938

•Intraoral scanners with different scan mechanisms didn't affect the congruence between the library file and the scan mesh of the tested scan body system. To investigate the congruence between the meshes of a combined healing abutment-scan body (CHA-SB) system acquired with four different intraoral scanners and the corresponding library file. A CHA-SB was fixed to an implant at the right first molar position in a dentate mandibular model and digitized by using 4 different intraoral scanners (IOSs) [TRIOS 3 (T3), Omnicam (OC), Primescan (PS), and Virtuo Vivo (VV)] (n = 8) and an industrial grade optical scanner (ATOS Core 80) (n = 1) to generate standard tessellation language (STL) files of the test scans (CHA-SB-STLs) and the master reference model scan (MRM-STL). A reverse engineering software (Studio Geomagic X) was used to superimpose the proprietary library file of the CHA-SB over the generated STL files. Root mean square (RMS) values representing the deviations between the library file and the superimposed STL files were statistically analyzed by using 1-way ANOVA (α=0.05). Qualitative analysis of the deviations was performed by visual inspection. Differences between the congruence of the library file and the CHA-SB scans among different IOSs were nonsignificant (F = 1.619, df= 3, P = .207). The single best result was 29 ± 28.9 µm for OC, 30.8 ± 29.6 µm for VV, 35.6 ± 35.5 µm for T3, and 39.5 ± 39.2 µm for PS, which were all above the deviation value of the scan performed by using the industrial-grade scanner (23.2 ± 23.2 µm). The dimensional congruence between the library file and the STL file of the CHA-SB system scans was similar when intraoral scanners with different acquisition technologies were used to scan a model with an implant. Scans of the tested intraoral scanners may result in crowns with similar positional accuracy, given the similarities in congruence of their scans with the library file.