[Studies on dental casting ferromagnetic alloys (author's transl)].

We previously reported successful applications of rare earth-cobalt magnets to dental prostheses. In order to use magnets more effectively, ferromagnetic materials with a high magnetic permeability and a high saturation flux density should be used as prosthetic materials. This type of material will form a good magnetic path, and consequently tighten the magnetic attracting force by preventing the magnetic flux from leaking into the mouth tissue. A few alloys were newly prepared by using Pd, Co and Cr, the usual dental metals, and tested. It was found that: (1) These alloys have suitable magnetic properties. (2) The corrosion resistances of the Pd-Co and Pd-Co-Cr alloys are as good as those of dental casting Ag and Ni-Cr alloys, respectively. (3) The physical and mechanical constants of the alloys are similar to those of the usual dental casting alloys. (4) These alloys can be used as dental casting ferromagnetic alloys. (5) The Pd-Co alloy can also be used as a porcelain bonding alloy.