Digitale Volumentomographie: Artefakte bei der Verwendung von Wurzelstiftsystemen in der Endodontie
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The aim of this study was to examine artifacts generated by various root canal systems in cone-beam computed tomography (cbct). Effects of material, geometrical shape, cbct settings/ artifact reduction program and the cbct’s themselves on the artifact morphology were analyzed and evaluated. KaVo Pan eXam Plus and the KaVo 3D eXam has been tested. The post materials zirconium dioxide, titanium, glass fiber reinforced composite and gutta-percha with a composite core were tested. For this purpose, cbct scans of the test groups and a control group in a dental arch model with different settings were recorded. The reconstructed volumes were evaluated through a specially developed examination sheet and the results were compared. The differences in the geometrical shape of the posts had no effect on the artifact morphology. The ceramic posts caused the strongest artifacts, they even had an influence on outlying areas. Artifacts could be assigned as streak-, extinction-, aliasing, ring- and other artifacts. The different artifacts often occured together. The artifact reduction algorithm didn’t reduce the artifacts significantly and even caused partially blurred pictures. The difference between the various tested volumes is very complex and can not establish a scheme that makes a statement about an improvement / deterioration of the artifact formation at a certain volume. The Pan eXam Plus caused most artifacts, but the scans were also more detailed. The results of this study show how much artifacts in cbct’s affect the evaluation and quality assessment in endodontics and lead to a loss of information and diagnostic misinterpretation. These results indicate the need for further studies and developments from the manufacturers of cbct’s to improve the image quality and to keep radiation exposure on patients as low as possible.
Subject HeadingsArtefakt <Bildgebende Diagnostik> [GND]
Cone-beam computed tomography [MeSH]