Abstract
The purpose of this study was to examine effects of magnetizing, methods on attractive forces in disk-type model and crown-type model which consisted of two kinds of Fe-Pt magnetic alloys (Fe-39.5Pt-0.75 Nb (mole%), Fe-39.5 Pt-0.65 Nb-0.1Si (mole%)). In addition the surface roughness and adaptability of the inner surfaces were examined in the crown-type model.The results were as follows:1. Surface roughness (crown-type samples)There was no significant difference between the alloys. As for the alloys, surface roughness was greater than that of the metal model.2. Adaptability (crown-type samples)The adaptability of the crown-type was loose. In order to keep the frictional forces as small as possible, the expansion of the investment was intentionally increased by the adjustment of the L/P ratio.3. Attractive forces1) Disk-type samplesThe attractive force of the disk-type was large when magnetized at four-poles on a plane and the attractive force of a sample was 734 gf on the average.2) Crown-type samplesThe attractive force observed with crown-type (magnetized along the crown axis, Fe-39.5 Pt-0.65 Nb-0.1 Si (mole%)) showed 536 gf on the average. This value was sufficient for retaining removable crowns and bridges.
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