title: Radiofrequency heating and magnetic field interactions of fixed partial dentures during 3-tesla magnetic resonance imaging.
abstract: OBJECTIVE
  This study evaluated the heating and magnetic field interactions of fixed partial dentures in a 3-Tesla (3T) magnetic resonance imaging (MRI) environment.
  
  
  METHODS
  Three substructure materials (Co-Cr, Ni-Cr, ZrO₂) were used to fabricate twelve 4-retained bridges and 12 crowns. Specimens were evaluated at 3T for radiofrequency heating and magnetic field interactions. One-way analysis of variance (ANOVA) test was used to compare continuous variables of temperature change. Significance was set at P < .05. Translational attraction and torque values of specimens were also evaluated.
  
  
  RESULTS
  None of the groups exhibited excessive heating (mean temperature change, < 1.4 °C), with maximum increase at the end of the T-1. Moreover, in all groups, only relatively minor magnetic field interactions that would not cause movement in situ were observed.
  
  
  CONCLUSIONS
  The study findings indicated that patients with fixed partial dentures (single crown or bridge) fabricated from Co-Cr, Ni-Cr, and zirconia substructures may safely undergo MRI at up to 3T.
authors.affiliation: Assistant Professor, Department of Prosthodontics, Dental Health Sciences Center, Gulhane Military Medical Academy, Ankara, Turkey.
authors.forename: Simel
authors.initials: S
authors.lastname: Ayyıldız
authors.forename: Kıvanç
authors.initials: K
authors.lastname: Kamburoğlu
authors.forename: Cumhur
authors.initials: C
authors.lastname: Sipahi
authors.forename: Sema
authors.initials: S
authors.lastname: Murat
authors.forename: Serkan
authors.initials: S
authors.lastname: Görgülü
authors.forename: Bülent
authors.initials: B
authors.lastname: Pişkin
mesh_terms: D000704:Analysis of Variance; D002857:Chromium; D003035:Cobalt; D017267:Dental Prosthesis Design; D003830:Denture, Partial, Fixed; D006358:Hot Temperature; D006801:Humans; D060526:Magnetic Fields; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008422:Materials Testing; D009532:Nickel; D015040:Zirconium
chemical_list: D002857:Chromium; D003035:Cobalt; D009532:Nickel; D015040:Zirconium; C028541:zirconium oxide