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EXPERIMENTAL STUDY ON THE MECHANISM OF ACQUIRED ACID RESISTANCE OF HUMAN DENTAL ENAMEL BY LASER IRRADIATION

Research Project

Project/Area Number 02454472
Research Category

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

Allocation TypeSingle-year Grants
Research Field 小児・社会系歯学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

TAGOMORI Shoko (1992)  KYUSHU UNIVERSITY FACULTY OF DENTISTRY ASSISTANT PROFESSOR, 歯学部, 講師 (20150469)

森岡 俊夫 (1990-1991)  九州大学, 歯学部, 教授 (00028721)

Co-Investigator(Kenkyū-buntansha) HORIE Junji  KYUSHU UNIVERSITY FACULTY OF DENTISTRY RESEARCH ASSOCIATE, 歯学部, 助手 (60209286)
IWASE Tatsuo  KYUSHU UNIVERSITY FACULTY OF DENTISTRY ASSISTANT PROFESSOR, 歯学部, 講師 (60151734)
OHO Takahiko  KYUSHU UNIVERSITY FACULTY OF DENTISTRY ASSISTANT PROFESSOR, 歯学部, 講師 (50160940)
稲井 裕子  九州大学, 歯学部, 助手 (00193540)
田籠 祥子  九州大学, 歯学部, 講師 (20150469)
Project Period (FY) 1990 – 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥7,800,000 (Direct Cost: ¥7,800,000)
Fiscal Year 1992: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1991: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1990: ¥6,200,000 (Direct Cost: ¥6,200,000)
KeywordsHUMAN ENAMEL / LASER IRRADIATION / HEATING / BIREFRINGENCE / X-RAY DIFFRACTION / INFRARED SPECTROSCOPY / THERMAL ANALYSES / レ-ザ-照射 / エナメル質 / 耐酸性 / アパタイト結晶 / 天然ハイドロキシアパタイト / 赤外分光分析
Research Abstract

A possible mechanism of acquired acid resistance of lased enamel was proposed on the basis of the investigations of optical properties, compositional and structural changes and permeability of lased and unlased human dental enamel. Lased enamel showed a high positive birefringence, suggesting the formation of 'microspaces' in enamel. No new products were found, though a decrease of lattice strain and a slight a-axis contraction were recognized in lased enamel compared with unlased enamel. The contents of water, carbonate and organic substances were reduced in lased enamel.
On the other hand, the optical properties and permeability of heated enamel and lased enamel after treatment with various solutions were investigated to elucidate the structural changes caused in dental enamel by laser irradiation. Heated enamel at 400゚C for 24 hours acquired the highest resistance to acid decalcification and showed a high positive birefringence which was similar to that of lased enamel. Carbolic fuchsin, acidulated phosphate fluoride (APF), and calcifying fluid did not penetrate the heated enamel, though those solutions penetrated the lased enamel well. Gradual changes of birefringence were observed in lased enamel during treatment with acid solutions, and this change was attributed to mineralization of the microspaces in lased enamel.
These results suggested that the structural changes in lased enamel are different from those of heated enamel. It appears that lased enamel has micropathways through which solutions can penetrate into the enamel, and also microspaces which could act as sites of deposition for ions released by acid decalcification.

Report

(4 results)
  • 1992 Annual Research Report   Final Research Report Summary
  • 1991 Annual Research Report
  • 1990 Annual Research Report
  • Research Products

    (9 results)

All Other

All Publications (9 results)

  • [Publications] 於保 孝彦: "各種溶液処理によるレーザー照射および加熱処理エナメル質の変化" 口腔衛生学会雑誌. 43. 58-62 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 於孝 孝彦: "唾液浸漬によるレーザー照射エナメル質の変化" 口腔衛生学会雑誌. 42. 353-358 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] TAKAHIKO,Oho: "Changes in Lased and in Heated Human Enamel after Treatment with Various Solutions" Journal of Dental Health. 43(1). 58-62 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Takahiko,Oho: "Changes in Human Lased Enamel after Immersion in Human Saliva" Journal of Dental Health. 42(3). 353-358 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 於保 孝彦: "各種溶液処理によるレーザー照射および加熱処理エナメル質の変化" 口腔衛生学会雑誌. 43. 58-62 (1993)

    • Related Report
      1992 Annual Research Report
  • [Publications] 於保 孝彦: "唾液浸漬によるレーザー照射エナメル質の変化" 口腔衛生学会雑誌. 42. 353-358 (1992)

    • Related Report
      1992 Annual Research Report
  • [Publications] 森岡 俊夫: "レ-ザ-歯学最近の進歩" 歯界展望. 79. 1011-1020 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] T.Morioka: "Proceedinge of The 3rd World Congress on Preventive Dentistry" Preventive Dentistry.Faculty of Dentistry,KYUSHU UNIVERSITY, 325 (1992)

    • Related Report
      1991 Annual Research Report
  • [Publications] 森岡 俊夫,於保 孝彦: "Arレ-ザ-照射によるヒトエナメル質のX線回折による耐酸性向上機構" 第3回日本レ-ザ-歯学研究会. (1991)

    • Related Report
      1990 Annual Research Report

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Published: 1990-04-01   Modified: 2016-04-21  

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