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Artifacts in magnetic resonance imaging and computed tomography caused by dental materials.

Klinke T, Daboul A, Maron J, Gredes T, Puls R, Jaghsi A, Biffar R - PLoS ONE (2012)

Bottom Line: Artifacts produced in both MRI and CT images were categorized according to the size of the artifact.Metal based restoration materials had strong influence on CT and less artifacts in MRI images.Rare earth elements such as Ytterbium trifluoride found in composites caused artifacts in both MRI and CT.

View Article: PubMed Central - PubMed

Affiliation: Polyclinic of Prosthodontics and Biomaterials, Greifswald University, Greifswald, Germany.

ABSTRACT

Background: Artifacts caused by dental restorations, such as dental crowns, dental fillings and orthodontic appliances, are a common problem in MRI and CT scans of the head and neck. The aim of this in-vitro study was to identify and evaluate the artifacts produced by different dental restoration materials in CT and MRI images.

Methods: Test samples of 44 materials (Metal and Non-Metal) commonly used in dental restorations were fabricated and embedded with reference specimens in gelatin moulds. MRI imaging of 1.5T and CT scan were performed on the samples and evaluated in two dimensions. Artifact size and distortions were measured using a digital image analysis software.

Results: In MRI, 13 out of 44 materials produced artifacts, while in CT 41 out of 44 materials showed artifacts. Artifacts produced in both MRI and CT images were categorized according to the size of the artifact.

Significance: Metal based restoration materials had strong influence on CT and less artifacts in MRI images. Rare earth elements such as Ytterbium trifluoride found in composites caused artifacts in both MRI and CT. Recognizing these findings would help dental materials manufacturers and developers to produce materials which can cause less artifacts in MRI and CT images.

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Related in: MedlinePlus

MRI artifact produced by Tetric EvoCeram in (A) T1 and (B) T2.
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pone-0031766-g002: MRI artifact produced by Tetric EvoCeram in (A) T1 and (B) T2.

Mentions: In MR images, there were no significant differences in artifact area extent between T1 and T2. In group 1 (Composites) 23 materials showed no artifacts (category 0), while 8 materials were assigned to category 1 (Figure 2). In group 2 (Temporary filling materials), 3 materials showed no artifacts, while only one material (Cavit) was classified in category 1. In group 3 (Ceramics) all 5 materials showed no artifacts. In group 4 (metal alloys) 4 materials were classified in category 1, while 2 materials (Remanium Star and Degunorm) showed object projections in an area far from the object itself(Figure 3).


Artifacts in magnetic resonance imaging and computed tomography caused by dental materials.

Klinke T, Daboul A, Maron J, Gredes T, Puls R, Jaghsi A, Biffar R - PLoS ONE (2012)

MRI artifact produced by Tetric EvoCeram in (A) T1 and (B) T2.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3285178&req=5

pone-0031766-g002: MRI artifact produced by Tetric EvoCeram in (A) T1 and (B) T2.
Mentions: In MR images, there were no significant differences in artifact area extent between T1 and T2. In group 1 (Composites) 23 materials showed no artifacts (category 0), while 8 materials were assigned to category 1 (Figure 2). In group 2 (Temporary filling materials), 3 materials showed no artifacts, while only one material (Cavit) was classified in category 1. In group 3 (Ceramics) all 5 materials showed no artifacts. In group 4 (metal alloys) 4 materials were classified in category 1, while 2 materials (Remanium Star and Degunorm) showed object projections in an area far from the object itself(Figure 3).

Bottom Line: Artifacts produced in both MRI and CT images were categorized according to the size of the artifact.Metal based restoration materials had strong influence on CT and less artifacts in MRI images.Rare earth elements such as Ytterbium trifluoride found in composites caused artifacts in both MRI and CT.

View Article: PubMed Central - PubMed

Affiliation: Polyclinic of Prosthodontics and Biomaterials, Greifswald University, Greifswald, Germany.

ABSTRACT

Background: Artifacts caused by dental restorations, such as dental crowns, dental fillings and orthodontic appliances, are a common problem in MRI and CT scans of the head and neck. The aim of this in-vitro study was to identify and evaluate the artifacts produced by different dental restoration materials in CT and MRI images.

Methods: Test samples of 44 materials (Metal and Non-Metal) commonly used in dental restorations were fabricated and embedded with reference specimens in gelatin moulds. MRI imaging of 1.5T and CT scan were performed on the samples and evaluated in two dimensions. Artifact size and distortions were measured using a digital image analysis software.

Results: In MRI, 13 out of 44 materials produced artifacts, while in CT 41 out of 44 materials showed artifacts. Artifacts produced in both MRI and CT images were categorized according to the size of the artifact.

Significance: Metal based restoration materials had strong influence on CT and less artifacts in MRI images. Rare earth elements such as Ytterbium trifluoride found in composites caused artifacts in both MRI and CT. Recognizing these findings would help dental materials manufacturers and developers to produce materials which can cause less artifacts in MRI and CT images.

Show MeSH
Related in: MedlinePlus