Objective  To investigate the influence of artifacts produced by two types of implants and porcelain fused to metal crowns on magnetic resonance imaging (MRI).

  Methods  Two types of implants (ITI and BLB) were separately attached on a volunteer's bilateral skins of the mandible on the first molars, then the Au-Pt alloy crown and Ni-Cr alloy crown with the same volume were fixed on the ITI and BLB implants, respectively. Before and after the fixation of the crowns, the artifacts produced by implants and crowns under coronal MRI were observed. The magnetic field intensity was 3.0T, and TSE/EPI sequence was used.

  Results  Both the implants produced artifacts on the MRI. The areas of the artifacts produced by ITI and BLB implants were 2.7 cm² and 4.0 cm², respectively. After fixation of Au-Pt alloy crown and Ni-Cr alloy crown, the areas of artifacts became 4.9 cm² and 7.3 cm².

  Conclusion  The artifacts produced by pure titanium implant and porcelain fused to noble metal crowns had smaller impacts on the MRI than those produced by BLB implant and Ni-Cr alloy crown.