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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

Dimensions of (A) wedge-shaped specimens and (B) reference.
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pone-0031766-g001: Dimensions of (A) wedge-shaped specimens and (B) reference.

Mentions: Samples of 44 different materials (metal and non-metal), which are commonly used in dental practice, were included in this study (N = 44). The samples were divided into 4 groups; group 1: Composites (N = 31), group 2: temporary filling materials (N = 4), group 3: Dental ceramics (N = 5) and group 4: Metal alloys (N = 4). The test specimens were wedge-shaped with the dimensions of 16.0 mm in length by 9.0 mm in width, 3.5 mm high at the rear and 1 mm high at the tip (Figure 1a). Additionally, acrylic round reference specimens with an 11.0 mm diameter by 3.0 mm height were made (Figure 1b). We selected the wedge shape to have different material thickness from the tip and rear of each wedge, which will allow comparing the effect of artifacts produced by the test specimens of varying thickness on the adjacent acrylic round reference specimens.


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)

Dimensions of (A) wedge-shaped specimens and (B) reference.
© Copyright Policy
Related In: Results  -  Collection

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

pone-0031766-g001: Dimensions of (A) wedge-shaped specimens and (B) reference.
Mentions: Samples of 44 different materials (metal and non-metal), which are commonly used in dental practice, were included in this study (N = 44). The samples were divided into 4 groups; group 1: Composites (N = 31), group 2: temporary filling materials (N = 4), group 3: Dental ceramics (N = 5) and group 4: Metal alloys (N = 4). The test specimens were wedge-shaped with the dimensions of 16.0 mm in length by 9.0 mm in width, 3.5 mm high at the rear and 1 mm high at the tip (Figure 1a). Additionally, acrylic round reference specimens with an 11.0 mm diameter by 3.0 mm height were made (Figure 1b). We selected the wedge shape to have different material thickness from the tip and rear of each wedge, which will allow comparing the effect of artifacts produced by the test specimens of varying thickness on the adjacent acrylic round reference specimens.

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