日本補綴歯科学会雑誌
Online ISSN : 1883-177X
Print ISSN : 0389-5386
ISSN-L : 0389-5386
超弾性型Ni-Ti合金によるキャストクラスプの力学的研究
第3報キャストクラスプの適合性
角南 利彦小野 高裕杉山 幸三郎野首 孝祠奥野 善彦
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1988 年 32 巻 6 号 p. 1317-1322

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The purpose of this study is to investigate the influence of setting expansion and thermal expansion of the phosphate-bonded investment on the fitness of cast claspsfabricated by a superelastic Ni-Ti alloy. Investment models were made from the columnar stainless-steel model supposed the abutment tooth the various dilusion colloidal silica solutions.Cast clasps were fabricated using by using a superelastic Ni-Ti alloy, then dimensional changes at the tip and mid-point of clasp arm between before and after fitness of cast clasps to the stainless-steel model were measured by the using of a profile projector. In addition, setting expansion and thermal expansion of investments were measured.
Results were as follows:(1) Setting expansion increased with the increase of the concentration of colloidal silca solution, however thermal expansion kept constant.(2) Cast clasps fabrcated by using the investment model with 1.6% of setting expansion and 1.0% of thermal expansion showed the best fitness.

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