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Radiofrequency heating and magnetic field interactions of fixed partial dentures during 3-tesla magnetic resonance
Simel Ayyıldız1, Kıvanç Kamburoğlu, Cumhur Sipahi
1Assistant Professor, Department of Prosthodontics, Dental Health Sciences Center, Gulhane Military Medical Academy, Ankara, Turkey.
Objective:
This study evaluated the heating and magnetic field interactions of fixed partial dentures in a 3-Tesla (3T) magnetic resonance imaging (MRI) environment.
Study Design:
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.
Conclusion:
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.
