Background: Artifacts caused by dental restorations, such as dental crowns, dental fillings and orthodontic appliances, are a\r\ncommon problem in MRI and CT scans of the head and neck. The aim of this in-vitro study was to identify and evaluate the\r\nartifacts produced by different dental restoration materials in CT and MRI images.\r\nMethods: Test samples of 44 materials (Metal and Non-Metal) commonly used in dental restorations were fabricated and\r\nembedded with reference specimens in gelatin moulds. MRI imaging of 1.5T and CT scan were performed on the samples\r\nand evaluated in two dimensions. Artifact size and distortions were measured using a digital image analysis software.\r\nResults: In MRI, 13 out of 44 materials produced artifacts, while in CT 41 out of 44 materials showed artifacts. Artifacts\r\nproduced in both MRI and CT images were categorized according to the size of the artifact.\r\nSignificance: Metal based restoration materials had strong influence on CT and less artifacts in MRI images. Rare earth\r\nelements such as Ytterbium trifluoride found in composites caused artifacts in both MRI and CT. Recognizing these findings\r\nwould help dental materials manufacturers and developers to produce materials which can cause less artifacts in MRI and\r\nCT images.
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