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Analysis of surface characteristics of lased dentin and development of new adhesive system

Research Project

Project/Area Number 17591992
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Conservative dentistry
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

FUJITANI Morioki  Hiroshima University, Graduate School of Biomedical Sciences, Associate Professor, 大学院医歯薬学総合研究科, 助教授 (60190055)

Co-Investigator(Kenkyū-buntansha) HARIMA Takahiro  Hiroshima University, Hospital, Research Associate, 病院・助手 (90343293)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2006: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2005: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsEr : YAG Laser / CO2 Laser / Irradiation energy / Ultra-morphology / Adhesive resin / Adhesive property / Dentin / Er : YAGレーザー / レジン
Research Abstract

The aim of this study was to promote the adhesive properties of dentin bonding systems (DBSs) to lased dentin by analyzing the consistency of bond strengths of DBSs with ultra-morphological changes of sound dentin lased at various power output.
Laser ablation of sound dentin at low power (Er : YAG: 60 mJ/1 pps, CO2: 1 w/0.3 sec) reduced adhesive properties of DBSs. However, high-and middle-energy laser ablation of dentin (Er : YAG: 250 mJ/1 pps, 150 mJ/1 pps, CO2: 3 w/0.3 sec) hardly reduced the bond strength. In the subsurface layer of low-power lased dentin, TEM observations of decalcified specimens revealed that the amorphous matrix substances containing denatured collagen fibers were generated (Er:YAG: 3-4μm, CO2: 1-2μm). On the other hand, in the middle or high power lased dentin (Er : YAG: 250 mJ/1 pps, 150 mJ/1 pps, CO2: 3 w/0.3 sec), such morphological structure as hardly distinguished from sound dentin (Er:YAG) or the subsurface dentin layer having both little amorphous matrix and torn collagen fibers with cross-striation (CO2) was observed. The effects of laser ablation on middle or high power might be limited to superficial layer, which did not cause the reduction in adhesive properties.
From the achievements of this study, the removal method of the affected superficial layer of lased dentin and the development of the DBS specifically for laser-irradiated dentin will be investigated in the next year.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (10 results)

All 2006 2005

All Journal Article (10 results)

  • [Journal Article] レーザー照射によるレジンの接着性に関する問題点2006

    • Author(s)
      冨士谷 盛興
    • Journal Title

      小児歯科臨床 11・3

      Pages: 12-19

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] CO2およびEr : YAGレーザー照射象牙質面に対するレジンの接着特性-レーザー照射象牙質面に対しレジンは本来の接着性能を発揮できるか?-2006

    • Author(s)
      冨士谷 盛興
    • Journal Title

      日本レーザー噛学会誌 17・2

      Pages: 74-80

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Problems in adhesive properties of resinous materials to lased dentin Japanese Journal of Dentistry for Children2006

    • Author(s)
      Morioki Fujitani
    • Journal Title

      Japanese Journal of Dentistry for Children 11

      Pages: 12-19

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Adhesive properties of resin bonding systems to Er- : YAG or CO2 lased dentin-Does the resin bonding system exhibit its full adhesive performance to lased dentin?-2006

    • Author(s)
      Morioki Fujitani
    • Journal Title

      Journal of Japanese Society for Laser Dentistry 17

      Pages: 74-80

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] CO2およびEr : YAGレーザー照射象牙質面に対するレジンの接着特性-レーザー照射象牙質面に対しレジンは本来の接着性能を発揮できるか?-2006

    • Author(s)
      冨士谷 盛興
    • Journal Title

      日本レーザー歯学会誌 17・1

      Pages: 28-28

    • Related Report
      2006 Annual Research Report
  • [Journal Article] レーザー処理象牙質におけるレジンの接着性と界面の超微細構造-照射エネルギーの大きさの影響について-2006

    • Author(s)
      播磨 貴裕
    • Journal Title

      日本レーザー歯学会誌 17・1

      Pages: 27-27

    • Related Report
      2006 Annual Research Report
  • [Journal Article] CO2およびEr : YAGレーザー照射象牙質面に対するレジンの接着特性-レーザー照射象牙質面に対しレジンは本来の接着性能を発揮できるか?-2006

    • Author(s)
      冨士谷 盛興
    • Journal Title

      日本レーザー歯学会誌 17・2

      Pages: 74-80

    • Related Report
      2006 Annual Research Report
  • [Journal Article] レーザー処理象牙質における界面の超微細構造とレジンの接着性-照射エネルギーの相違が及ぼす影響-2006

    • Author(s)
      播磨 貴裕
    • Journal Title

      日本レーザー歯学会講演抄録集

      Pages: 48-48

    • Related Report
      2006 Annual Research Report
  • [Journal Article] レーザー処理象牙質におけるレジンの接着性と界面の超微細構造-照射エネルギーの大きさの影響について-2005

    • Author(s)
      播磨 貴裕
    • Journal Title

      第17回日本レーザー歯学会総会・学術大会講演抄録集 特別号

      Pages: 64-64

    • Related Report
      2005 Annual Research Report
  • [Journal Article] CO2およびEr:YAGレーザー照射象牙質面に対するレジンの接着特性2005

    • Author(s)
      冨士谷 盛興
    • Journal Title

      第17回日本レーザー歯学会総会・学術大会講演抄録集 特別号

      Pages: 22-22

    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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