Comparative assessment of the quality of internal fit of temporary artificial crowns to the stump of a prepared tooth made using traditional and digital technologies

Vоkulova Julia Andreevna, Zhulev Evgeny Nikolaevich

The aim of the study was to study the quality of the internal fit of temporary artificial crowns made using the Asiga Max UV 3D printer, the KaVo ARCTICA CAD/CAM system, using digital images of the experimental model obtained by the intraoral laser scanner iTero Cadent and temporary artificial crowns made by the laboratory method. The size of the internal fit of artificial crowns was measured in the Image J computer program from photos of internal fit silicone replicas made using a Leica M320 operating microscope at 40-fold magnification. The Friedman criterion was used for statistical analysis of the obtained data. It was found that the average value of the cement gap between the tooth stump and the artificial crown made in the KaVo ARCTICA CAD/CAM system is 49,76 ± 2,532 microns, made using the Asiga Max UV 3D printer is 50,00 ± 1,714 microns, made using the traditional laboratory method without the use of digital technologies, was 151,60 ± 11,00 microns. Based on the data obtained, it is concluded that modern digital technologies allow manufacturing temporary artificial crowns with a smaller size of the cement gap, i.e. with significantly higher accuracy in contrast to artificial crowns obtained using traditional technology (p<0,05).

Keywords:digital technologies in dentistry, digital impressions, CAD/CAM, intraoral scanner, 3D printing, internal fit of fixed prostheses