[Comparison of magnetic resonance imaging artifacts of five common dental materials].
OBJECTIVE
To compare five materials commonly used in dentistry, including three types of metals and two types of ceramics, by using different sequences of three magnetic resonance imaging (MRI) field strengths (0.35, 1.5, and 3.0 T).


METHODS
Three types of metals and two types of ceramics that were fabricated into the same size and thickness as an incisor crown were placed in a plastic tank filled with saline. The crowns were scanned using an magnetic resonance (MR) machine at 0.35, 1.5, and 3.0 T field strengths. The TlWI and T2WI images were obtained. The differences of various materials in different artifacts of field MR scans were determined.


RESULTS
The zirconia crown presented no significant artifacts when scanned under the three types of MRI field strengths. The artifacts of casting ceramic were minimal. All dental precious metal alloys, nickel-chromium alloy dental porcelain, and cobalt-chromium ceramic alloy showed varying degrees of artifacts under the three MRI field strengths.


CONCLUSIONS
Zirconia and casting ceramics present almost no or faint artifacts. By contrast, precious metal alloys, nickel-chromium alloy dental porcelain and cobalt-chromium ceramic alloy display MRI artifacts. The artifact area increase with increasing magnetic field.
Yisheng
Y
Xu
Risheng
R
Yu
D016477:Artifacts; D002516:Ceramics; D002858:Chromium Alloys; D003442:Crowns; D003722:Dental Alloys; D003764:Dental Materials; D003776:Dental Porcelain; D060526:Magnetic Fields; D008279:Magnetic Resonance Imaging; D015040:Zirconium
D002858:Chromium Alloys; D003722:Dental Alloys; D003764:Dental Materials; D003776:Dental Porcelain; C066018:nichrome; D015040:Zirconium; C028541:zirconium oxide