Évaluation des risques d'échauffement et de déplacement des appareils orthodontiques en imagerie par résonance magnétique

The results show a very moderate increase in temperature of the materials during MRI exposure, less than 1̊C, in particular in the metal wire linking the brackets. The maximal forces observed were on the order of 0.27 N. The risk of detachment and displacement seems to be nonexistent at 1.5 Tesla when the usual recommendations are respected. Temporary removal of the wire and verification of the adhesive is recommended. However, priority should be given to nonmagnetic or slightly magnetic material to limit artifacts as much as possible when exploring the head region.