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KMID : 1024020150450030159
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Imaging Science in Dentistry
2015 Volume.45 No. 3 p.159 ~ p.168
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A comparative study of metal artifacts from common metal orthodontic brackets in magnetic resonance imaging
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:Kajan Zahra Dalili
:Khademi Jalil/:Alizadeh Ahmad/:Hemmaty Yasamin Babaei/:Roushan Zahra Atrkar
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Abstract
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Purpose : This study was performed to compare the metal artifacts from common metal orthodontic brackets in magnetic resonance imaging.
Materials and Methods : A dry mandible with 12 intact premolars was prepared, and was scanned ten times with various types of brackets: American, 3M, Dentaurum, and Masel orthodontic brackets were used, together with either stainless steel (SS) or nickel titanium (NiTi) wires. Subsequently, three different sequences of coronal and axial images were obtained: spin-echo T1-weighted images, fast spin-echo T2-weighted images, and fluid-attenuated inversion recovery images. In each sequence, the two sequential axial and coronal images with the largest signal-void area were selected. The largest diameters of the signal voids in the direction of the X-, Y-, and Z-axes were then measured twice. Finally, the mean linear values associated with different orthodontic brackets were analyzed using one-way analysis of variation, and the results were compared using the independent t-test to assess whether the use of SS or NiTi wires had a significant effect on the images.
Results : Statistically significant differences were only observed along the Z-axis among the four different brands of orthodontic brackets with SS wires. A statistically significant difference was observed along all axes among the brackets with NiTi wires. A statistically significant difference was found only along the Z-axis between nickel-free and nickel-containing brackets.
Conclusion : With respect to all axes, the 3M bracket was associated with smaller signal-void areas. Overall, the 3M and Dentaurum brackets with NiTi wires induced smaller artifacts along all axes than those with SS wires.
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KEYWORD
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Magnetic Resonance Imaging, Orthodontic Brackets, Artifacts, Orthodontic Wires
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