title: The effect of 3 T MRI on microleakage of amalgam restorations.
abstract: OBJECTIVE
  To evaluate the effects of 3 T magnetic field on microleakage of amalgam restorations containing three different types of silver (Ag).
  
  
  METHODS
  60 extracted teeth were restored with three different types of amalgam filling materials. Restored teeth were sectioned mesiodistally and divided into experimental and control groups. Experimental groups were exposed to a magnetic field of 3 T for 20 min. All samples were plunged into 2% basic fuchsin solution and examined under a digital microscope by three different observers with regard to microleakage.
  
  
  RESULTS
  Statistical analysis showed significant differences in microleakage between the groups exposed to MRI and controls, whereas differences in microleakage between amalgam types were insignificant.
  
  
  CONCLUSIONS
  The primary risk of MRI systems arises from the effects of its strong magnetic field on objects containing ferromagnetic materials. An MRI of 1.5 T is known to be safe for amalgam restorations. However, our research indicates that MRI is not completely devoid of any effects on amalgam restorations.
authors.affiliation: Department of Oral and Maxillofacial Radiology, Kirikkale University, Kirikkale, Turkey. semiyard@gmail.com
authors.forename: S
authors.initials: S
authors.lastname: Yilmaz
authors.forename: M
authors.initials: M
authors.lastname: Misirlioglu
mesh_terms: D004396:Coloring Agents; D003723:Dental Amalgam / Q000737:chemistry* / Q000528:radiation effects; D003737:Dental Cavity Preparation / Q000145:classification; D003743:Dental Enamel / Q000648:ultrastructure; D003763:Dental Leakage / Q000145:classification*; D003793:Dental Restoration, Permanent / Q000145:classification; D003804:Dentin / Q000648:ultrastructure; D006801:Humans; D060526:Magnetic Fields; D008279:Magnetic Resonance Imaging / Q000379:methods*; D012394:Rosaniline Dyes; D012834:Silver / Q000737:chemistry / Q000528:radiation effects; D013997:Time Factors
chemical_list: D004396:Coloring Agents; D012394:Rosaniline Dyes; D012834:Silver; C025485:basic fuchsin; D003723:Dental Amalgam
keywords: MRI; MRI safety; amalgam; dental filling; microleakage