[Magnetic resonance imaging artefacts and fixed orthodontic attachments].
| Autor: | Beau A; Faculté d'odontologie, rue Guillaume-Paradin, 69372 Lyon Cedex 08, France., Bossard D; Centre d'imagerie médicale Mermoz, 55 avenue Jean-Mermoz, 69008 Lyon, France., Gebeile-Chauty S; Faculté d'odontologie, rue Guillaume-Paradin, 69372 Lyon Cedex 08, France. |
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| Jazyk: | francouzština |
| Zdroj: | L' Orthodontie francaise [Orthod Fr] 2017 Jun; Vol. 88 (2), pp. 131-138. Date of Electronic Publication: 2017 Jun 09. |
| DOI: | 10.1051/orthodfr/2017004 |
| Abstrakt: | Objectives: Orthodontic appliances are often removed before magnetic resonance imaging (MRI) scans because they are known to produce artefacts. The purpose of this study was to find the exact indications for removal of various fixed attachments when imaging four specific areas of the head and neck. Materials and Methods: Sixty patients requiring an MRI scan of the head for medical reasons volunteered for this investigation. One of four different types of fixed attachments (stainless steel brackets, titanium brackets, ceramic brackets with metal slots, and stainless steel retainers) were assigned to a patient. Each patient had two scans at 1.5 T: with an "empty wax jig" and with a wax jig including the attachment. Archwires were not investigated as they are easily removed before a scan. Two radiologists evaluated the scans of each patient and each of the four areas under investigation: maxillary sinus, oral cavity, temporomandibular joints and posterior cerebral fossa. Results: Stainless steel brackets always caused non-interpretability of all anatomic areas (100 per cent). Titanium brackets, ceramic brackets with metal slots, and stainless steel retainers caused artefact in the oral cavity only (for 20, 16.65, and 86.65 per cent of the subjects). Conclusions: Our results show that ceramic brackets with metal slots and titanium brackets do not always have to be removed before MRI scans of the head and neck, depending on the area under investigation. Metal fixed retainers should only be removed if the oral cavity itself is under investigation. Stainless steel brackets should always be removed before MRI scans of the head and neck. (© EDP Sciences, SFODF, 2017.) |
| Databáze: | MEDLINE |
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