Magnetic field interactions of orthodontic wires during magnetic resonance imaging (MRI) at 1.5 Tesla.
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Magnetic field interactions of orthodontic wires during magnetic resonance imaging (MRI) at 1.5 Tesla. / Klocke, Arndt; Kemper, Jörn; Schulze, Dirk; Adam, Gerhard; Kahl-Nieke, Bärbel.
In: J OROFAC ORTHOP, Vol. 66, No. 4, 4, 2005, p. 279-287.Research output: SCORING: Contribution to journal › SCORING: Journal article › Research › peer-review
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TY - JOUR
T1 - Magnetic field interactions of orthodontic wires during magnetic resonance imaging (MRI) at 1.5 Tesla.
AU - Klocke, Arndt
AU - Kemper, Jörn
AU - Schulze, Dirk
AU - Adam, Gerhard
AU - Kahl-Nieke, Bärbel
PY - 2005
Y1 - 2005
N2 - BACKGROUND: Orthodontic appliances pose a potential risk during magnetic resonance imaging (MRI) due to forces on metallic objects within the static magnetic field of MRI systems. The aim of the present investigation was to measure forces on orthodontic wires caused by the static magnetic field of a 1.5-Tesla MRI system, and to assess the safety hazards associated with these forces. MATERIALS AND METHODS: Thirty-two different orthodontic wires (21 arch wires, eight ligature wires and three retainer wires) were investigated in a 1.5-Tesla MRI system (Magnetom Symphony, Siemens Medical Solutions, Erlangen, Germany). The translational forces were measured using the deflection angle test (ASTM F2052-02); rotational forces were assessed on a 5-point qualitative scale. RESULTS AND CONCLUSION: All retainer wires and the steel arch wires (the Noninium arch wire being the exception) were subjected to considerable rotational and translational forces within the MRI system's magnetic field. Translational forces were from 9.1- to 27.6-times as high as gravitational forces on these objects. Steel ligature wires and arch wires made of cobalt chromium, titanium molybdenum, nickel-titanium, and brass alloys showed no or negligible forces within the magnetic field. The translational and rotational forces within the MRI magnetic field should pose no risk to carefully-ligated arch wires. Steel retainer wire bonds should be checked to ensure secure attachment prior to an MRI investigation.
AB - BACKGROUND: Orthodontic appliances pose a potential risk during magnetic resonance imaging (MRI) due to forces on metallic objects within the static magnetic field of MRI systems. The aim of the present investigation was to measure forces on orthodontic wires caused by the static magnetic field of a 1.5-Tesla MRI system, and to assess the safety hazards associated with these forces. MATERIALS AND METHODS: Thirty-two different orthodontic wires (21 arch wires, eight ligature wires and three retainer wires) were investigated in a 1.5-Tesla MRI system (Magnetom Symphony, Siemens Medical Solutions, Erlangen, Germany). The translational forces were measured using the deflection angle test (ASTM F2052-02); rotational forces were assessed on a 5-point qualitative scale. RESULTS AND CONCLUSION: All retainer wires and the steel arch wires (the Noninium arch wire being the exception) were subjected to considerable rotational and translational forces within the MRI system's magnetic field. Translational forces were from 9.1- to 27.6-times as high as gravitational forces on these objects. Steel ligature wires and arch wires made of cobalt chromium, titanium molybdenum, nickel-titanium, and brass alloys showed no or negligible forces within the magnetic field. The translational and rotational forces within the MRI magnetic field should pose no risk to carefully-ligated arch wires. Steel retainer wire bonds should be checked to ensure secure attachment prior to an MRI investigation.
M3 - SCORING: Zeitschriftenaufsatz
VL - 66
SP - 279
EP - 287
JO - J OROFAC ORTHOP
JF - J OROFAC ORTHOP
SN - 1434-5293
IS - 4
M1 - 4
ER -