Studies on New Dental Investment Containing AlPO<sub>4</sub> : Part 2 Application of Refractory Material for Dental Investment

DOI
  • KAMEMIZU Hideo
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • TAKEZAWA Yasumasa
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • IMURA Seiichi
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • HAYASHI Kenji
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • MIZUGUCHI Hiroyuki
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • IIJIMA Mayumi
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • WAKAMATSU Nobukazu
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • GOTO Takayasu
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • DOI Yutaka
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • MORIWAKI Yutaka
    Department of Dental Materials & Technology, Asahi University, School of Dentistry
  • HAEUCHI Yoshio
    Taisei Dental Mfg.Co.Ltd.
  • KUBO Fuminobu
    Taisei Dental Mfg.Co.Ltd.

Bibliographic Information

Other Title
  • リン酸アルミニウムを利用した新しい歯科用埋没材の研究 : 第2報 埋没材用耐火材としての応用

Search this article

Abstract

Two types of new dental investments were developed for low-and high-temperature castings by using AlPO4 as a substitute for SiO2, which has been used as a refractory material in many commercially available investments.Heating of AlPO4 at higher temperatures resulted in the formation of berlinite and cristalphite with the ratio of their phases depending on the heating temperature. The low temperature investments prepared by mixing 20wt% of gypsum with 80wt% of the mixture of berlinite and crystalphite, i.e. gypsum bonded investment, showed 2% greater heating expansion at 900℃ as the amount of crystalphite increased.Heating expansion of the high temperature investment prepared by mixing 20wt% of NH4H2PO4 and MgO with 80wt% of berlinite was more than 7% at 1,000℃. Using this investment with no appreciable setting expansion, it is possible to compensate for casting shrinkage by heating expansion alone, thus avoiding possible deformation of wax petterns during setting expansion.

Journal

Keywords

Details 詳細情報について

Report a problem

Back to top