A comparative study of metal artifacts from common metal orthodontic brackets in magnetic resonance imaging.
10.5624/isd.2015.45.3.159
- Author:
Zahra DALILI KAJAN
1
;
Jalil KHADEMI
;
Ahmad ALIZADEH
;
Yasamin BABAEI HEMMATY
;
Zahra ATRKAR ROUSHAN
Author Information
1. Department of Maxillofacial Radiology, Faculty of Dentistry, Guilan University of Medical Sciences, Rasht, Iran. zahradalili@yahoo.com
- Publication Type:Comparative Study ; Original Article
- Keywords:
Magnetic Resonance Imaging;
Orthodontic Brackets;
Artifacts;
Orthodontic Wires
- MeSH:
Artifacts*;
Bicuspid;
Magnetic Resonance Imaging*;
Mandible;
Nickel;
Orthodontic Brackets*;
Orthodontic Wires;
Stainless Steel;
Titanium
- From:Imaging Science in Dentistry
2015;45(3):159-168
- CountryRepublic of Korea
- Language:English
-
Abstract:
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.
