新型吸引埋没鋳造機について : 第5報 歯科用大型鋳造物の製作  [in Japanese] Studies on New Vacuum Casting Apparatus : 5)Casting Procedure of Frame for Denture  [in Japanese]

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Author(s)

    • 小野 喬 ONO Takashi
    • 東北大学歯学部歯科保存学第二講座 Department of Operative Dentistry, School of Dentistry, Tohoku University
    • 奥田 礼一 OKUDA Reiichi
    • 東北大学歯学部歯科保存学第二講座 Department of Operative Dentistry, School of Dentistry, Tohoku University

Abstract

我々の開発した吸引型鋳造機に, 試作した大型の鋳造用リングを装着し, 歯科用としては比較的大型の義歯用フレームの鋳造試験を行なった. <br>試験の結果<br>1)この方法を用いれば, 全部床義歯あるいは部分床義歯に使用する金属フレームの鋳造に際してはきわめて失敗が少なく, 鋳造体表面, 特にその上面はきわめて滑沢なものが得られる. <br>2)吸引鋳造法によって, このような大型の鋳造物の製作が可能となった理由は, 鋳造リング上面に上蓋を装することにより, リングと埋没材の隙間におこりがちな空気の漏洩が防止できたこと, 側面からも陰圧が作用したため, 排気効率が向上し, 鋳造に際して鋳型上面と鋳型内部間に, きわめて瞬時に圧力差を作り得たためであると考えられた.

The casting of a comparatively large-sized frame for denture was tested by connecting the large casting-ring especially designed for new vacuum casting apparatus in this study. <br>The following results were obtained:<br>1)The casting of the metal frame for full or partial dentures was possible and had few failures with this technique. An extremely smooth casting especially at the outer surface was obtained. <br>2)The reason why this vacuum casting-procedure made it possible to produce these large castings was conjected as follows: Avoiding the leakage of air which tended to occur at the gap between the casting-ring and investment by covering the casting-ring, the improvement of exhaust efficiency by means of negative pressure from the bottom and the side of the mold occurring simultaneously and the quick attainment of sufficient pressure difference between the top and the inside of the mold.

Journal

  • The Journal of the Japanese Society for Dental Materials and Devices

    The Journal of the Japanese Society for Dental Materials and Devices 1(4), 323-327, 1982

    The Japanese Society for Dental Materials and Devices

Codes

  • NII Article ID (NAID)
    110002989282
  • Text Lang
    JPN
  • ISSN
    0286-5858
  • Data Source
    NII-ELS  J-STAGE 
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