Abstract: Objective: To evaluate the magnetic properties of metal implants and provide experimental basis for clinical magnetic resonance imaging (MRI) examination and a reference for doctors and patients to choose implants by water model experiment. Methods: Different brands of implants were placed in a water model, which were scanned by a 4.7 T magnetic resonance machine. Results: There were no missile effect for all implants, but there were local influences caused by implants differing in range depending on brands. The artifacts generated in the spin echo sequence scan were less significant than those generated in gradient echo sequence. Conclusion: The metal implants, whose magnetic susceptibility is much larger than 10^-4, can be treated as the very weak ferromagnetic material. Though they have local impacts on MRI, they can be safely present during MRI examination.

Key words: Dental implants , MRI artifact, Water model