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Dental bur fragments causing metal artifacts on MR images
T Kaneda1, M Minami, H D Curtin
1Department of Radiology, Massachusetts Eye and Ear Infirmary and Harvard Medical School, Boston 02114, USA.
AJNR. American Journal of Neuroradiology
|March 21, 1998
Summary
Dental bur fragments can cause metal artifacts on magnetic resonance (MR) images. Subgingival placement of dental restorations increases artifact severity, impacting diagnostic accuracy.
Area of Science:
- Dental Materials Science
- Medical Imaging
- Oral Pathology
Background:
- Metal artifacts on magnetic resonance (MR) images can obscure diagnostic information.
- Dental procedures may inadvertently leave fragments of instruments in oral tissues.
- Understanding the source of artifacts is crucial for accurate MR interpretation.
Purpose of the Study:
- To investigate the contribution of dental bur fragments to MR image artifacts.
- To assess the impact of dental restoration margin placement on artifact generation.
Main Methods:
- Dental prosthetic reconstructions were created in dogs, preparing teeth with diamond burs.
- Full-cast crowns were cemented with margins placed subgingivally and at the gingival margin level.
- MR imaging was performed, followed by histopathologic examination and X-ray fluorescent element analysis.
Main Results:
- Metal artifacts were observed in the mandible, with greater signal distortion on the side with subgingival crown margins.
- Artifacts persisted after crown removal, and bur fragments were found in the gingiva, particularly on the subgingival side.
- Iron was detected in gingival tissues containing bur fragments.
Conclusions:
- Dental bur fragments contribute to MR image artifacts.
- Gingival damage and the presence of metallic fragments from dental burs are implicated in MR image distortion.