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 A Study on Discoloration of Au-Ag-Pd Alloy : Part 1. Influence of Oral Microorganism

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著者

    • 高山 慈子 TAKAYAMA Yasuko
    • 鶴見大学歯学部歯科補綴学第一講座 The First Department of Prosthetic Dentistry, Tsurumi University School of Dental Medicine
    • 三浦 英司 MIURA Eiji
    • 鶴見大学歯学部歯科補綴学第一講座 The First Department of Prosthetic Dentistry, Tsurumi University School of Dental Medicine
    • 細井 紀雄 HOSOI Toshio
    • 鶴見大学歯学部歯科補綴学第一講座 The First Department of Prosthetic Dentistry, Tsurumi University School of Dental Medicine

抄録

目的: 本研究は, 金銀パラジウム合金の変色と, 口腔微生物ならびにVSC (CH<SUB>3</SUB>SH, H<SUP>2</SUP>S) 産生量との関連性を<I>in vitro</I>で明らかにすることを目的としている.<BR>方法: 4種の歯科鋳造用金属試料を<I>Fusobacterium nucleatum</I>または<I>Streptococcus mutans</I>を加えたTHB培地 (一部L-Cysteine添加) に入れ, 37℃で嫌気培養を4週間行った. 培養後, 試料の輝度, 色調の測定ならびに定性分析を行った.<BR>結果: 1. <I>F. nucleatum</I>を培養した培地で, 金銀パラジウム合金は輝度, 色差ともに大きな変化を示した. 2. 金銀パラジウム合金は, 口腔微生物のない状態や<I>S. mutans</I>培養環境下でも色調変化が認められ, L-Cysteineを添加すると顕著となった. 3. チタン, コバルトクロム合金, 白金加金は変色が少なかったが, 口腔微生物培養環境下でより輝度の低下を認めた. 4. 定性分析の結果, 金銀パラジウム合金試料では全条件で硫黄 (S) が検出された.<BR>結論: 本研究により金銀パラジウム合金の変色と口腔微生物, VSC産生量との関連性が検証された. VSCを多量に産生する<I>F. nucleatum</I>は, 歯周病や口臭の原因菌とされており, 金銀パラジウム合金の変色や腐食は, 歯周疾患, 口腔清掃状態などの口腔内環境と深いかかわりがあることが判明した.

Purpose: The purpose of this <I>in vitro</I> study was to investigate the oral conditions that cause discoloration of 12 mass%Au-Ag-Pd alloy, and to investigate the relation between discoloration and the amounts of volatile sulfur compounds (CH<SUB>3</SUB>SH, H<SUB>2</SUB>S) and oral microorganisms (<I>Fusobacterium nucleatum, Streptococcus mutans</I>) produced.<BR>Materials and Methods: Casts (5×5×0.46mm) of Au-Ag-Pd, titanium, Co-Cr and Au-Pt alloy were incubated in THB broth for four weeks at 37°C. Oral microorganisms such as <I>Fusobacterium nucleatum or Streptococcus mutans</I> incubated in the THB broth. After incubation, the luminance of thecasts were evaluated and color differences (ΔE<SUP>*</SUP>ab) between before and after incubation were calculated according to the CIELab color system. The cast surface was observed using an electron probe X-ray microanalyzer.<BR>Results: 1. Luminance and ΔE<SUP>*</SUP>ab of Au-Ag-Pd alloy incubated with <I>Fusobacterium nucleatum</I> showed a marked amount of accretion, and <I>Fusobacterium nucleatum</I> was related to the production of CH<SUB>3</SUB>SH, H<SUB>2</SUB>S. 2. The casts of Au-Ag-Pd alloy incubated with control and <I>Streptococcus mutans</I> were discolored and discoloration tended to be more marked in THB broth including L-cysteine. 3. The reduced luminance found in the casts of titanium, Co-Cr and Au-Pt alloy was less than that found in Au-Ag-Pd alloy. 4. Qualitative analysis showed that sulfide was produced after four weeks of incubation in Au-Ag-Pd alloy.<BR>Conclusions: The findings indicated <I>in vitro</I> that the production of CH3SH, H2S was related to the discoloration of Au-Ag-Pd alloy. The discoloration of Au-Ag-Pd alloy may also be related to the total oral conditions such as periodontics, halitosis and oral care.

収録刊行物

  • 日本補綴歯科學會雜誌 = The journal of the Japan Prosthodontic Society

    日本補綴歯科學會雜誌 = The journal of the Japan Prosthodontic Society 46(2), 223-232, 2002-04-10

    Japan Prosthodontic Society

参考文献:  21件中 1-21件 を表示

被引用文献:  4件中 1-4件 を表示

各種コード

  • NII論文ID(NAID)
    10008157009
  • NII書誌ID(NCID)
    AN00197911
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    03895386
  • データ提供元
    CJP書誌  CJP引用  J-STAGE 
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