Dental Investment Material Using New Expansion Mechanism : Part 1 Thermal Decomposition and Thermal Expansion Characteristics of Al<Sub>2</Sub> (PHO<Sub>3</Sub>)<Sub>3</Sub>

DOI 1 Citations 9 References
  • GYOTOKU Tomoyoshi
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • KAMEMIZU Hideo
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • WATANABE Takashi
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • PARK Kenji
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • HAYASHI Kenji
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • IIJIMA Mayumi
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • WAKAMATSU Nobukazu
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • ADACHI Masanori
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • GOTO Takayasu
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • DOI Yutaka
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • MORIWAKI Yutaka
    Department of Dental Materials & Technology, School of Dentistry, Asahi University
  • KUBO Fuminobu
    Taisei Dental Mfg. Co. Ltd.

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Other Title
  • 新しい膨張機構による歯科鋳造用埋没材の開発 : 第1報 亜リン酸アルミニウムの熱分解反応と膨張特性

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Abstract

Dental investments were developed using the expansion originating from thermal decomposition and crystal growth of decomposed phases of a new aluminum phosphate compound, aluminum phosphite Al2 (PHO3)3. The thermal decomposition of aluminum phosphite was investigated thermoanalytically together with X-ray diffraction and gas-chromatography. The thermal dimensional changes of gypsum-bonded investments containing aluminum phosphite were measured. The aluminum phosphite, which had decomposed by 400℃, expanded as the temperature increased, while transforming to crystal growth of aluminum orthophosphate and aluminum methaphosphate, which took place when heated further, contributed to a large expansion of the investments. Since the amount of thermal expansion could be regulated without any difficulty, it would be possible to develop dental investments that employ expansion alone.

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