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Improvement of Acid Resistance of Oral Hard Tissue Coated with Ceramic Materials by Using a Carbon Dioxide Laser

Research Project

Project/Area Number 12671909
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 InstitutionKanagawa Dental College

Principal Investigator

KURATA Shigeaki  Kanagawa Dental College, Department of Biomaterials & Devices, Associate Professor, 歯学部, 助教授 (20104333)

Co-Investigator(Kenkyū-buntansha) NIHEI Tomotaro  Kanagawa Dental College, Department of Operative Dentsitry and Endodontics, Assistant, 歯学部, 助手 (50237781)
UMEMOTO Kozo  Kanagawa Dental College, Department of Biomaterials & Devices, Professor, 歯学部, 助教授 (40097275)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2002: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2001: ¥800,000 (Direct Cost: ¥800,000)
KeywordsLaser / Ceramics / Caries prevention / Surface treatment / Enamel / 耐酸性
Research Abstract

The acid resistance of the enamel treated with PGC was extremely improved, that of the enamel treated with silica-zirconium oxide was slightly improved, and that treated with NORI was not improved. The increase of the acid resistance of the enamel treated with PGC may be due to good wetting of PGC melted by laser irradiation to the enamel surface, as the composition of PGC was analogous to hard tooth tissue that was calcium phosphate.
To study new restoration and to improve the acid resistance of teeth, the enamel surface was coated with several ceramic materials by a carbon dioxide gas laser. The carbon dioxide gas laser used was Opelaser/03S (Yoshida Co.), the irradiation chip of the laser was hold at 20 mm high on the enamel surface. Those ceramics were the phosphate calcium glass (PGC, Asahi glass Co.), the porcelain for metal-ceramics (NORI, Noritake Co.), commercial silica-zirconium oxide. The ceramics were grinded followed by sieved with 400 mesh sieve, and the obtained powders w … More ere suspended with distilled water to 50 mg/ml. The ceramic powder suspension were applied on the enamel surface treated with 37% phosphoric acid (K-etchant, Kuratay Co.), and then the enamel was irradiated by a pulsed CO_2 laser at irradiation intensities of 1.0 watt for 30 seconds with a beam size of 0.49 mm at the focal point. And all surface except for the circle of 3 mm diameter on the irradiated enamel surface was painted with nail varnish. The painted enamel sample was immersed in 10 ml of 0.1M-acetic acid/sodium acetate buffer solution at pH 4.0 for 30 minutes. The calcium ions released in the buffer solution from the enamel were measured by flame analysis.
It is well known that the enamel treated with fluoride anion followed by lanthanum cation showed good acid resistance. Therefore, the enamel etched with the phosphoric acid was treated with 1% sodium fluoride aqueous solution followed by 1% lanthanum chloride aqueous solution, and then was irradiated by the laser. However, the acid resistance of the irradiated enamel was not improved.
On the other hand, to improve the operations of radiation and to reduce the damage of the enamel by laser irradiation, the laser with a wide focal point was studied. It was found that the enamel treated with PGC by using the laser with the wide focal point showed good acid resistance without the damage of the enamel. Less

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 二瓶智太郎: "炭酸ガスレーザーによるエナメル質表面へのセラミックスの融着に関する研究"日本歯科保存学雑誌. 45. 649-656 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 倉田茂昭: "レーザーを用いたセラミックス処理による歯質のう蝕予防と修復"歯科材料・器械. 20・特別号. 57-58 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Nihei T., Kurata S., Umemoto K., Teranaka T.: "Ceramic coating on enamel surface by a CO_2 laser"The Japanese Journal of Conservative Dentistry. 45, No.4. 649-656 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kurata S.: "Improvement of acid resistance of oral hard tissues coating with ceramic materials by using a carbon dioxide laser"The Journal of the Japanese Society for Dental Materials and devices. 20, (Special). 57-58 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] 二瓶智太郎: "炭酸ガスレーザーによるエナメル質表面へのセラミックスの融着に関する研究"日本歯科保存学雑誌. 45・4. 649-656 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] 倉田茂昭: "レーザーを用いたセラミックス処理による歯質のう蝕予防と修復"歯科材料・器械. 20・特別号. 57-58 (2001)

    • Related Report
      2002 Annual Research Report
  • [Publications] 二瓶智太郎,倉田茂昭 ら: "レーザーによるセラミックス修復法(第1報)エナメル質表面のセラミックス化について"第35回日本歯科理工学会学術講演会講演集(歯科材料・器械). 19巻special Issue35. 48 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 二瓶智太郎,倉田茂昭 ら: "レーザーによるセラミックス修復法(第2報)エナメル質表面のモールダント処理後の照射"歯科材料・器械 第36回日本歯科理工学会学術講演会講演集. 19巻special Issue36. 65 (2000)

    • Related Report
      2000 Annual Research Report

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

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