Watanabe I, Tanaka Y, Fukunaga H, Hisatsune K, Atsuta M
Department of Fixed Prosthodontics, School of Dentistry, Nagasaki University, 1-7-1 Sakamoto, 852-8588, Nagasaki, Japan.
Dent Mater. 2001 May;17(3):197-200. doi: 10.1016/s0109-5641(00)00069-5.
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.
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.
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).
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.
本研究的目的是检测不同成分的铸造铁铂合金对牙科钕铁硼磁体的吸引力。
将Fe-40原子百分比铂、Fe-38原子百分比铂、Fe-37原子百分比铂和Fe-36原子百分比铂合金铸锭铸入用于牙科磁性附着体衔铁的模型模具中。测量铸造铁铂合金衔铁和磁性不锈钢衔铁对牙科Fe(14)Nd(2)B磁体（MAGFIT和HICOREX）的吸引力，并进行统计学评估。使用振动样品磁强计在1.6 MA/m的磁场下记录磁滞回线，测定每种铁铂合金的饱和磁化强度。
降低铂的百分比会增加饱和磁化强度值，并导致对每个磁体的吸引力增加。对于两种磁体，Fe-36原子百分比铂合金试样与不锈钢衔铁之间的吸引力无统计学差异（p>0.05）。还发现铂百分比与饱和磁化强度值之间存在明确的相关性（r(2)=-１.000）。
铂含量低于Fe-39.5原子百分比的铁铂合金产生高饱和磁化强度值和对磁体的巨大吸引力，因此，它们有潜力用作磁性附着体衔铁。在测试的铁铂合金中，Fe-36原子百分比铂似乎是制造磁性附着体衔铁的最佳成分。
