17-7 析出硬化型ステンレス鋼の歯科領域への応用について
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The application of 17-7 P.H. Stainless steel in dentistry was investigated. The age-hardening effect of this steel was considerably remarkable and its mechanical properties can be controlled by a double heat treatment. In the present paper the following subjects were studied in view of practical applications : 1) Its mechanical properties as a dental material. 2) The appropriate conditions of heat treatment for this steel. 3) The in vitro and in vivo corrosion resistance. 4) Phase transformation during aging. The results were summarized as follow : First, the steel was subjected to a prior treatment (1050℃-30 min, prompt quenching), then tempered (760℃-30 min, prompt quenching), and finally accomplished a precipitation hardening treatment (450∿500℃-30 min, prompt quenching). The steel thus obtained showed the properties extremely suitable for dental use, having the following mechanical values : Hv (0.5)=500, σ_B=170kg/mm^2, ε=5∿7%. The corrosion resistance was examined by immersing in the four standard reagents (HCI, Na_2S, C_3H_6O_3, NaCI) at 37℃. A slight change was observed in its color and weight in cases of hydrochloric acid and sodium chloride, but no appreciable changes were found even in its 60 days' adaptation in oral cavity. The phase changes during the aging was studied by means of optical microscope, electron microscope and electric resistance measurement. The results seemed to suggest that the hardening process of this steel is necessary to pass over the three stages : "austenite-martensite-precipitation", though the precipitated phase itself could not be detected. Finally, the steel was tentatively applied to clinical usage : clasp, bar, supporting apparatus for orthodontics and fixing apparatus for alveolar pyorrhoea, obtaining the satisfactory results in most cases.
- 九州歯科学会の論文
- 1971-07-31
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