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

概要

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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 clasps fabricated 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 increse 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.
社団法人日本補綴歯科学会の論文
1988-12-01