Comparative in vitro evaluation of the accuracy of dental open system scanners

Abstract

Relevance. Contemporary Desktop scanner provides accuracy up to 5-15 micron according to the manufacturers, whereas the accuracy of intraoral scanners is near 25-30 micron. Foreign researches point out significant deviations, in some cases of more then 165 micro, of actual accuracy of different types of intraoral scanners in case dental arches scanning. Utilisation of such devices for prosthesis production can lead to unacceptable for the prosthodontic standards size of the clearance between prosthesis and its prosthetic bed. Purpose . Comparative assessment of actual accuracy of open system desktop and intraoral scanners for getting dental models. Materials and methods. The control model was produced using ExoCAD software and FormLab 3D printer. The model was scanned by 4 intraoral scanning devises (Identica i500, MyCrown Scan, PlanScan and Trios Wireless) and 3 stationary devices (Identica Hybrid, Open Technologies Easy and Open Technologies Neway). The matching of the scanned files and 3D analysis of the reference CAD model with test CAD models was performed in Geometric Control X software. Statistical analysis of the acquired data was performed by IBM SPSS 25. Results. TRIOS3 Wireless showed the best accuracy among intraoral scanners (82.6 mkm) the worst result in accuracy of the acquired data was for PlanScan (224,4 mkm). Open Technologies Easy was the most accurate among desktop scanners (53.9 mkm) and the least accurate is Open Technologies NeWay (72,48 mkm). Conclusion . Low accuracy of the intraoral scanning of the whole dental arch does not permit to use it for getting working model in case of production of the long span bridges especially in case of implant supported prosthetics.