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Light curing method for reducing polymerization contraction stress of light-cured composite restorations

Research Project

Project/Area Number 13671996
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Conservative dentistry
Research InstitutionTokyo Medical and Dental University

Principal Investigator

YOSHIKAWA Takako  Tokyo Medical and Dental University, Dept. of Restorative Sciences, Instructor, 大学院・医歯学総合研究科, 助手 (00182733)

Co-Investigator(Kenkyū-buntansha) TAKADA Tsunehiko  Tokyo Medical and Dental University, Dept. of Restrative Sciences, Instructor, 大学院・医歯学総合研究科, 助手 (70282762)
Project Period (FY) 2001 – 2003
Project Status Completed (Fiscal Year 2003)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2003: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2002: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2001: ¥2,400,000 (Direct Cost: ¥2,400,000)
Keywordspolymerization contraction stress / resin composite / light curing method / slow-start curing method / stepped curing method / ramped curing method / marginal leakage / cavity wall adaptation / Slow-start curing 法 / フロアブルレジン / 辺縁封鎖性 / Ramp射照法 / 辺縁封鎖法 / 曲げ強さ
Research Abstract

Light-cured resin-based composites are widely used in clinical practice because of the esthetic advantages, ease of use, excellent bonding to tooth structure, and improved mechanical properties.' However, the polymerization reaction of light-cured resin composites is faster than that of self-cured composites, which creates more gaps between the resin and cavity wall/floor than self-cured resin composites.
This projects was to evaluate the effect of light curing methods on the marginal sealing and cavity wall adaptation of resin composite restorations, and on the hardness at the top and bottom surfaces of a body of resin composite; Cylindrical cavities were prepared on flat bovine dentin surfaces. The teeth were restored with adhesive systems followed by light-cured composite. The resins were cured with NEW LIGHT VL-ll (VL-ll, GO), Co-bee (CBS GO) and experimental light curing unit (EP, GO); Group 1: VL-ll 700 mW/cm^2 s; Group 2: OB (Ramped curing) 210 mW/cm^2 to 700 mW/cm^2 5 s + 700 mW/cm^2 s; Group 3: EP (Stepped curing) 270 mW/cm^2 s + 5 s (interval) + 600 mW/cm^2 50 s. After thermocycling for 500 cycles between 500 and 5500 with a dwell time' 30 second, dye penetration tests around the cavity margin and cavity wall adaptation on cut surface were carried out. Dye penetration length was calculated as a percentage of the total cavity wall length.
The ramped and stepped curing significantly improved marginal sealing and resin composite adaptation to the cavity wall. These slow-start curing methods caused accelerating the hardening at the bottom surfaces of the resin composite.

Report

(4 results)
  • 2003 Annual Research Report   Final Research Report Summary
  • 2002 Annual Research Report
  • 2001 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] T.Yoshikawa, M.F.Burrow, J.Tagami: "A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations"Dental Materials. 17. 359-366 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yoshikawa, M.F.Burrow, J.Tagami: "The Effects of bonding System and Light Curing Method on Reducing Stress of Different C-factor Cavities"The Journal of Adhesive Dentistry. 13. 177-183 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] 海野亜由子, 吉川孝子, 山口佐緒理, 田上順次: "出力漸増型光照射法によるレジ修復物の辺縁封鎖性の向上効果について"接着歯学. 17. 102-119 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] TAKAKO YOSHIKAWA, YASUHIKO NAKAOKI, TSUNEHIKO TAKADA, MICHAEL F.BURROW, JUNJI TAGAMI: "The effects of light curing method and irradiation time on marginal sealing and cavity wall adaptation of resin composite restorations"American Journal of Dentistry. 16. 63A-67A (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yoshikawa, M.F.Burrow, J.Tagami: "A light curing method for improving marginal sealing and cavity wall adaptation of resin composite restorations"Dental Materials. Vol17No4. 359-366 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] T.Yoshikawa, M.F.Burrow, J.Tagami: "The Effects of Bonding System and Light Curing Method on Reducing Stress of Different C-factor Cavities"The Journal of Adhesive Dentistry. Vol3No2. 177-183 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] Ayuko Umino, Takako Yoshikawa, Saori Yamaguchi, Junji Tagami: "Effect of Ramped Curing on Improving Marginal Sealing of Resin Composite Restorations"Adhesive Dentistry. Vol17No2. 102-109 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] TAKAKO YOSHIKAWA, YASHUKO NAKAOKI, TSUNEHIKO TAKADA, MICHAEL F.BURROW, JUNJI TAGAMI: "The effects of light curing method and irradiation time on marginal sealing and cavity wall adaptation of resin composite restorations"American Journal of Dentistry. Vol16 Special Issue. 63A-67A (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2003 Final Research Report Summary
  • [Publications] TAKAKO YOSHIKAWA, YASUKO NAKAOKI, TSUNEHIKO TAKADA, MICHAEL BURROW, JUNJI TAGAMI: "The effect of Light curing method and irradiation time on marginal sealing and cavity wall adaptation of resin composite restorations"American Journal of Dentistry. 16・Special Issue. 63A-67A (2003)

    • Related Report
      2003 Annual Research Report
  • [Publications] TAKAKO YOSHIKAWA, YASUKO NAKAOKI, TSYNEHIKO TAKADA, MICHAEL BURROW, JUNJI TAGAMI: "The effect of light curing method and irradiation time on marginal sealing and cavity wall adaptation of resin composite restorations"American Journal of Dentistry. (in press).

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yoshikawa, H.F.Burrow, J.Tagami: "Alight ouring method for improving marginal stealing and cavity wall adaptation of resin composite restorations"Dental Materials. 17・4. 359-366 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.yoshikawa, M.F.Burrow, J.Tagami: "The Effect of Bonding System and Light Curing Method on Reducing Stress of Different C-factor Cavities"The Jourmal of Adhesive Dentistry. 3・2. 177-183 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 海野亜由子, 吉川孝子, 山口佐緒里, 田上順次: "出力漸増型光照射法によるレジン修復物の辺縁封鎖性の向上効果について"

    • Related Report
      2001 Annual Research Report

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

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