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Bacteriological Study for Prevention of Recurrent Caries

Research Project

Project/Area Number 60440088
Research Category

Grant-in-Aid for General Scientific Research (A)

Allocation TypeSingle-year Grants
Research Field Conservative dentistry
Research InstitutionNiigata University

Principal Investigator

IWAKU Masaaki  Niigata University, 歯学部, 教授 (70013927)

Co-Investigator(Kenkyū-buntansha) ARAI Hideaki  Niigata University, 歯学部, 助手 (00175952)
KOTA Kohichi  Niigata University, 歯学部, 助教授 (90018755)
HOSHINO Etsuro  Niigata University, 歯学部, 教授 (90124619)
Project Period (FY) 1985 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥18,200,000 (Direct Cost: ¥18,200,000)
Fiscal Year 1987: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1986: ¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 1985: ¥12,000,000 (Direct Cost: ¥12,000,000)
KeywordsRecurrent caries / Anaerobes / Metronidazole / α-TCP / 嫌気性菌 / Metronidazole
Research Abstract

Bacteriological Study for Prevention of Recurrent Caries This study was projected to develop the most effective clinical method for preventing recurrent caries by using bactericidal material against bacteria in human carious dentin. It was clarified by Hoshino that the majority of microorganisms isolated from both shallow and deep layers of dentinal lesions are obligate anaerobes, which suggests that autimicrobial treatment directed specifically against anaerobes may be effective in preventing complications. And, it has been well known that metronidazole(MN) has a wide spectrum of bactericidal action against obligate anaerobes.
Bactericidal efficacy of MN against bacteria in human carious dentin was clarified as follows:
1. Bacterial recovery from human carious dentin obtained from patients was measured on BHI-Blood agar plates containing MN(10<mu>g/ml) and on those lacking MN, and the addition of MN caused more than 99% reduction of bacterial recovery.
2. Overwhelming majority of bacteria in carious dentin of freshly extracted human teeth was not recovered when the lesions were covered with <alpha>-Tricalcium Phosphate <alpha>-TCP) cement containing 5% MN for 1-3 days, whereas more than 10^3 bacteria(CFU) were obtained when the lesions were covered with <alpha>-TCP cement containing no MN.
3. No any bacteria were recovered from the samples of dentinal lesions which hab been covered by <alpha>-TCP cement containing MN in situ for 1 day, 28 days and/or 1 year ana/or 2 years in vivo. The bactericidal efficacy of MN in situ is clearly demonstrated, suggesting that topical application of MN is effective in caries treatment to deisinfect bacteria which remained accidentally in the smear layer and under restorations or intentionally in the deep layers of acute dentin caries of the child's permanent molar just after eruption to avoid pulp exposure, or invade newly from the tooth surfaces.

Report

(3 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • 1985 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] Kohichi Kota: "Metronidazole in Cariology (1)The Bactericidal Effect in vitro on Bacteria in Human Carious Dentin and the Effect on Physical Properties of<alpha>-Tricalcium Phosphate Cement" Japanese Journal of Conservative Dentistry. 30. 147-151 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Masaaki Iwaku: "Metronidazole in Cariology (II)The Bactericidal Efficacy of Metronidazole in vivo against Bacteria in Lesions of Human Carious Dentin" Japanese Journal of Conservative Dentistry. 30. 1444-1448 (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Etsuro Hoshino: "Bactericidal Efficacy of Metronidazole Against Bacteria of Human Carious Dentin in Vitro" Caries Research. in press.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] Etsuro Hoshino: "Bactericidal Efficacy of Metronidazole against Bacteria of Human Carious Dentin in Vivo" Caries Research. received.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 子田晃一,星野悦郎,佐藤ミチ子,安藤直美,岩久正明: 日本歯科保存学会雑誌. 30. 147-151 (1987)

    • Related Report
      1986 Annual Research Report
  • [Publications] 岩久正明,星野悦郎,子田晃一,佐藤ミチ子,安藤直美: 日本歯科保存学会雑誌.

    • Related Report
      1986 Annual Research Report
  • [Publications] E.Hoshino;K.Kota;M.Sato;M.Iwaku: Caries Research.

    • Related Report
      1986 Annual Research Report
  • [Publications] E.Hoshino;M.Iwaku;M.Sato;N.Ando;K.Kota: Caries Research.

    • Related Report
      1986 Annual Research Report
  • [Publications] 日本歯科保存学会秋季学会発表 第83回. (1985)

    • Related Report
      1985 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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