Experiment of paste-paste type phosphate-bonded investment

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  • OSAWA Kaoru
    Department of Oral Biomaterials and Technology, Showa University School of Dentistry
  • ZHANG Zutai
    Department of Oral Biomaterials and Technology, Showa University School of Dentistry Beijing Institute of Dental Research, Faculty of Stomatology, Capital University of Medical Sciences
  • HOTTA Yasuhiro
    Department of Oral Biomaterials and Technology, Showa University School of Dentistry
  • TAMAKI Yukimichi
    Department of Oral Biomaterials and Technology, Showa University School of Dentistry

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Other Title
  • ペースト・ペースト型リン酸塩系歯科鋳造用埋没材の試作
  • ペースト ペーストガタ リンサンエンケイ シカ チュウゾウヨウ マイボツザイ ノ シサク

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Abstract

The purpose of this study was to develop experimental paste-paste-type phosphate-bonded investments and evaluate their clinical use. Powders for Paste 1 comprised a 100-g mixture of cristobalite (95, 90, 85 and 80g) and ammonium dihydrogen phosphate (5, 10, 15 and 20g). These were mixed with colloidal silica liquid, diluted twice with water, and four kinds (A-D) of paste were prepared. Paste 2 comprised magnesium oxide and vaseline. A commercial investment was also tested as a control. Fundamental properties and the casting accuracy with surface roughness were examined. With an increase in ammonium dihydrogen phosphate, extension of the setting time, an increase in setting expansion, and a decrease of thermal expansion were noted. However, the compressive strength after firing was almost the same among experimental investments. The casting from C showed a small gap and suitable surface, and the values were close to those obtained from the control. These results suggest that experimental paste type-investments are applicable for clinical use, and C was particularly promising.

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