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A Clinical Study n Discoloration of the Dental Casting Alloys

Research Project

Project/Area Number 13672061
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 補綴理工系歯学
Research InstitutionTsurumi University

Principal Investigator

TAKAYAMA Yasuko  Tsurumi University, School of Dental Medicine, Assistant Professor, 歯学部, 助手 (30175939)

Co-Investigator(Kenkyū-buntansha) MIURA Eiji  Tsurumi University, School of Dental Medicine, Assistant Professor, 歯学部, 助手 (20157423)
HIRANO Susumu  Tsurumi University, School of Dental Medicine, Professor, 歯学部, 教授 (00089400)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2003: ¥300,000 (Direct Cost: ¥300,000)
Fiscal Year 2002: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 2001: ¥3,100,000 (Direct Cost: ¥3,100,000)
KeywordsAg-Pd-Au alloy / Titanium / discoloration / color difference / Oral Microorganism / Heat treatment / Surface Observation / electrical potential / 変色層の厚さ / Fusobacterium nucleatum / チタン / SPM / ESCA / 口腔微生物
Research Abstract

The present study was to evaluate discoloration and accretion on the polished surface of dental cast metal in the oral cavity.
1. The findings indicated in vitro that the production of CH_3SH, H_2S was related to the discoloration of Au-Ag-Pd alloy. The dicoloration of Au-Ag-Pd alloy may also be related to the oral conditions such as periodontics, halitosis and oral care.
2. The prevention of discoloration was influenced by composition of Ag-Pd-Au alloys (Cu : 10.0〜20.0 mass%, Au 12.0 or 20.0 mass%). But it was difficult to prevent to the discoloration of commercially available Ag-Pd-Au alloys with the current compositions for patients having high corrosive influence on the mouth.
3. Cast clasps ware conventionally cast using Ag-20Pd-12Au alloy. After casting, the heat treatment was performed as wing manners : 1) Heated at 800℃ for 1 hour and quenched in water. 2) Heated at 800℃ for 1 hour and air cooled. As a control, cast clasps without heat treatment. Although there are significant differences in the luminance among two heat treatment and control, the luminance was markedly decreased in all conditions after delivery. On the high discoloration subjects heat treatments might be little effect.
4. The pure titanium and Ag-Pd-Cu-Au alloy were installed in the partial denture by cooperating in three patients and each denture was used as usual for two months. The surfaces of the discolored specimens were confirmed to be covered with the spherical accretion. The accretion of titanium was taken away by Argon ion etching in X-ray Photoelectron Spectroscopy and its thickness was confirmed to be 0.3〜0.5μm. However, the thickness of the accretion in Ag-Pd-Cu-Au alloy could not been estimated because it was taken away by Argon ion etching.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 高山慈子: "金銀パラジウム合金の変色に関する研究 第1報 口腔微生物の影響"日本補綴歯科学会雑誌. 46・2. 223-232 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 高山慈子: "金銀パラジウム合金の変色に関する研 究第2報 合金組成と耐変色性の関係"日本補綴歯科学会雑誌. 47・4. 652-661 (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 三浦英司: "金銀パラジウム合金の変色に関する研究 第3報 熱処理の影響"日本補綴歯科学会雑誌. 48・2. 212-221 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 小森山 学: "口腔内装着で変色した歯科用合金の表面分析"歯科材料・器械. 23・3. 193-199 (2004)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takayama Yasuko: "A Study on Discoloration of Au-Ag-Pd alloy, Part 1. Influence of Oral Microorganism"The Journal of the Japan Prosthodontic Society. 46(2). 223-232 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Takayama Yasuko: "A Study on Discoloration of Ag-Pd-Au Alloy, Part 2. Relationship between the Composition of Ag-Pd-Au alloys and Prevention of Discoloration"The Journal of the Japan Prosthodontic Society. 47(4). 652-661 (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Miura Eiji: "A Study on Discoloration of Ag-Pd-Au alloy, Part3. Effect of Heat Treatment"The Journal of the Japan Proshodontic Society. 48(2). 212-221 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Komoriyama Manabu: "Surface Analysis of Discolored Dental Alloys in the Oral Environment"The Journal of the Japanese Society for Dental Materials and Devices. 23(3). 193-199 (2004)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 高山慈子: "金銀パラジウム合金の変色に関する研究 第2報 合金組成と耐変色性の関係"日本補綴歯科学会雑誌. 47・4. 652-661 (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] 三浦英司: "金銀パラジウム合金の変色に関する研究 第3報 熱処理の影響"日本補綴歯科学会雑誌. 48・2. 212-221 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 小森山 学: "口腔内装着で変色した歯科用合金の表面分析"歯科材料・器械. 23・3. 21-27 (2004)

    • Related Report
      2003 Annual Research Report
  • [Publications] 高山慈子: "金銀パラジウム合金の変色に関する研究 第1報 口腔微生物の影響"日本補綴歯科学会雑誌. 46・2. 223-232 (2002)

    • Related Report
      2002 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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