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1990 Fiscal Year Final Research Report Summary

Fundamental and Clinical Studies on the Effect of Lasers Against Dental Hard Tissues

Research Project

Project/Area Number 01304048
Research Category

Grant-in-Aid for Co-operative Research (A)

Allocation TypeSingle-year Grants
Research Field 小児・社会系歯学
Research InstitutionKyushu University

Principal Investigator

MORIOKA Toshio  Kyushu University, Faculty of Dentistry, Professor, 歯学部, 教授 (00028721)

Co-Investigator(Kenkyū-buntansha) MAEDA Mitsuo  Kyushu University, Faculty of Engineering, Professor, 工学部, 教授 (80037910)
SHOJI Shigeru  Tohoku University, Faculty of Dentistry, Assistant Professor, 歯学部, 講師 (10142986)
KUMAZAKI Mamoru  Osaka Dental University, Associate Professor, 助教授 (80066985)
TANI Yoshiaki  Kyoto University, Center for Biomedical Engineering, Professor, 教授 (90026881)
MATSUMOTO Kokichi  Showa University, Faculty of Denistry, Professor, 歯学部, 教授 (70119171)
Project Period (FY) 1989 – 1990
KeywordsLaser / Incipient Caries / Acid Resistance / Enamel / Fluoride / Hyper Sensitive Dentine / Pain Relieve / Secondary Dentine
Research Abstract

1. Combined effect of laser and fluoride on incipient dental caries
Artificial caries lesions were made on the buccal surface of human premolars, and the enamel was then treated with laser and fluoride. The acid resistance of the enamel was examined by demineralization in acidic solutions. An increase in acid resistance and fluoride uptake was caused by floride treatment after Nd-YAG laser irradiation. Specimens of human enamel were topically applied with solutions of acidulated phosphate fluoride. In addition, remarkable remineralization of artificial caries lesions was seen in these specimens after exposure to calcifying fluid.
2. Effect of laser on relieving pain of hyper sensitive dentine
Sixty patients with cervical hyper sensitive dentine were irradiated with 60 mW of diode laser for relieving pain. An analjesic effect was observed in all the cases, especially in the case of grade 1 and 2. The effect was less sensitive in the case of grade 3.
Similar results were obtained by using He-Ne laser with 10 mW. These results indicate that the low power lasers are useful for treatment of patients with hyper sensitive dentine.
3. Effect of laser on activation of enzymes in dental pulp
Stimulation of secondary dentine formation was observed by Nd-YAG laser irradiation. This phenomenon is due to the activation alkaline phosphatase. The pulpal chamber was almost completely filled with sencondary dentine 4 weeks after CO_2 laser irradiation.

  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] 森岡 俊夫: "レ-ザ-による歯科医療の最近の進歩" 医療. 6. 82-85 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshi Morioka: "Low Power Laser in Dentistry" proceeding on 2nd World Congerss of Laser in Medicine. 18-19 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshiaki Tani: "Morphology of Dentinal Smear Laser Formed by Different Cutting Instruments" Abstracts of 38th Annual Meeting of Japanese Association for Dental Research. 54. 54 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 熊崎 護: "象牙質知覚敏症に対する半導体レ-ザ-の治療効果" 日本歯科保存学会雑誌. 33. 911-918 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 前田 三男: "分光分折用メンテナンスフリ-TEA室素レ-ザ-" レ-ザ-研究. 18. 79-83 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mitso Maeda: "Laser Induced Fluorsence Detection of Sodium Atomized by a Microwave Induced Plasma" Analytical Chemistry. 62. 680-683 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Toshio Morioka: "Recent Development of Lasers in Dentistry" Iryo. 6. 82-85 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Toshio, Morioka: "Low Power Laser in Dentistry" Proceedings on 2nd World Congress ofLaser in Medicine. 18-19 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshiaki Tani: "Morphology of Dentinal Smear Laser Formed by Different Cutting Instruments" Abstracts of 38th Annual Meeting of Japanese Association for Dental Research, 54. 54. (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mamoru Kumazaki: "Clinical Effects of Semi-conductor Laser on Hypersensitive Dentine" The Japanese Journal of Conservative Dentistry. 33. 911-918 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mitsuo Maeda: "Maintenance-free TEA-M_2 Laser for Spectrophotometric Analysis" Laser Research. 18. 79-83 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mitsuo Maeda: "Laser-Induced-Fluoresence Detection of Sodium Atomized by a Microwave-Induced Plasma" Analytical Chemistry. 62. 680-683 (1990)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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