Attractive force of castable iron-platinum magnetic alloys.
OBJECTIVE
The objective of this study was to examine the attractive force of cast Fe-Pt alloys of varying compositions to dental iron-neodymium-boron magnets.


METHODS
Ingots of Fe-40 at%Pt, Fe-38 at%Pt, Fe-37 at%Pt and Fe-36 at%Pt alloys were cast in pattern molds for dental magnetic attachment keepers. The attractive forces of the cast Fe-Pt alloy keepers and magnetic stainless steel keepers to dental Fe(14)Nd(2)B magnets (MAGFIT and HICOREX) were measured and statistically evaluated. The saturation magnetization of each Fe-Pt alloy was determined by recording the hysteresis loop using a vibrating sample magnetometer under a magnetic field of 1.6 MA/m.


RESULTS
Decreasing the Pt percentage increased the saturation magnetization value and resulted in an increase of the attractive force to each magnet. There was no statistical difference (p>0.05) in attractive force between the Fe-36 at%Pt alloy specimens and the stainless steel keepers for both magnets. A definite correlation between Pt percentage and the value of saturation magnetization was also found (r(2)=-1.000).


CONCLUSIONS
The Fe-Pt alloys with less than Fe-39.5 at%Pt produced high saturation magnetization values and great attractive force to the magnet, and thus, they have the potential to serve as magnetic attachment keepers. Of the Fe-Pt alloys tested, Fe-36 at%Pt seemed to be the best composition for making magnetic attachment keepers.
Department of Fixed Prosthodontics, School of Dentistry, Nagasaki University, 1-7-1 Sakamoto, 852-8588, Nagasaki, Japan.
I
I
Watanabe
Y
Y
Tanaka
H
H
Fukunaga
K
K
Hisatsune
M
M
Atsuta
D000704:Analysis of Variance; D001895:Boron / Q000737:chemistry; D003722:Dental Alloys / Q000737:chemistry*; D003734:Dental Casting Investment / Q000737:chemistry; D006801:Humans; D007501:Iron / Q000737:chemistry*; D008280:Magnetics / Q000295:instrumentation*; D008422:Materials Testing; D008669:Metallurgy; D009354:Neodymium / Q000737:chemistry; D010984:Platinum / Q000737:chemistry*; D013193:Stainless Steel / Q000737:chemistry; D013223:Statistics as Topic; D013499:Surface Properties; D014732:Vibration
D003722:Dental Alloys; D003734:Dental Casting Investment; D013193:Stainless Steel; D009354:Neodymium; D010984:Platinum; D007501:Iron; D001895:Boron