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Artificial enamel induced by phase transformation of amorphous nanoparticles

Research Project

Project/Area Number 16K04954
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Crystal engineering
Research InstitutionNational Institute of Advanced Industrial Science and Technology

Principal Investigator

Kazuo Onuma  国立研究開発法人産業技術総合研究所, 生命工学領域, 上級主任研究員 (70356731)

Co-Investigator(Kenkyū-buntansha) 山越 康雄  鶴見大学, 歯学部, 教授 (20182470)
Research Collaborator Iijima Mayumi  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords人工エナメル質 / アモルファスナノ粒子 / 圧縮成形基板 / アパタイト / 相転移 / 選択的方位結晶成長 / 人工象牙質 / リン酸八カルシウム / OCP / フッ素イオン濃度 / 象牙質再生 / 基板成形圧力 / エナメルタンパク質 / 骨代替材料 / フッ素イオン / geometrical selection / ナノロッド型結晶 / 一方向配向 / 結晶成長 / 結晶工学 / 生体材料 / 歯学 / 再生医学
Outline of Final Research Achievements

Amorphous calcium phosphate nanoparticles (< 80 nm in size) were synthesized to use for regeneration of human tooth enamel and dentin. Nanoparticles were compression-molded to prepare a substrate, which was immersed into the calcium phosphate solution at 37C. Immersion after ~20 h, thick calcium phosphate layer (more than a few 10 micron-meter) formed on the substrate. The layer consisted of accumulated apatite nanorod crystals (a few 10 to 100 nm thick and a few micron-meter long), which were oriented to c-axis perpendicular to the substrate surface. This morphology was essentially the same as that of human tooth enamel. The average Ca/P molar ratio of each crystal was also close to that of human enamel apatite.
The amorphous nanoparticles in the substrate were transformed into the apatite nano-crystals after immersion. The morphology and chemical composition of apatite nano-crystals were consistent to those of human dentin, suggesting the possibility of rapid tooth regeneration.

Academic Significance and Societal Importance of the Research Achievements

現在の虫歯治療法は、う蝕領域を削って高分子(レジン)を充填するものである。同手法の最大の欠点は、充填物と歯を構成するアパタイト結晶との物性の相違により、接着部分に経時的に隙間が生じて二次う蝕が発生することである。この問題を根本的に解決するには、修復領域にエナメル質あるいは象牙質と同等の組織を作るしかない。我々はアモルファスリン酸カルシウムナノ粒子を用いて、エナメル質および象牙質類似組織を迅速形成することに初めて成功した。
本手法は細胞を全く使用しないため、極めて安価且つ簡便にう蝕部分を修復できる。ヒトの歯と完全な同等物による修復は「歯の再生」であり、今後の歯科治療を根本的に変革する可能性を持つ。

Report

(5 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Products Report
  • Research Products

    (14 results)

All 2019 2018 2017

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (2 results) (of which Int'l Joint Research: 2 results) Patent(Industrial Property Rights) (5 results)

  • [Journal Article] Potential for drug repositioning of midazolam for dentin regeneration.2019

    • Author(s)
      Karakida T, Onuma K, Saito MM, Yamamoto R, Chiba T, Chiba R, Hidaka Y, Abe-Fujii K, Kawahara H and Yamakoshi Y
    • Journal Title

      Int. J. Mol. Sci.

      Volume: 20(3) Issue: 3 Pages: 670-689

    • DOI

      10.3390/ijms20030670

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Octacalcium phosphate overgrowth on β-tricalcium phosphate substrate in metastable calcium phosphate solution2019

    • Author(s)
      Iijima Mayumi, Onuma Kazuo
    • Journal Title

      Biominerarization-From Molecular and Nano-structural Analyses to Environmental Science

      Volume: - Pages: 267-272

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Particle-size-dependent octacalcium phosphate overgrowth on β-tricalcium phosphate substrate in calcium phosphate solution2018

    • Author(s)
      Mayumi Iijima, Kazuo Onuma
    • Journal Title

      Ceramics International

      Volume: 44 Issue: 2 Pages: 2146-2157

    • DOI

      10.1016/j.ceramint.2017.10.167

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Roles of Fluoride on Octacalcium Phosphate and Apatite Formation on Amorphous Calcium Phosphate Substrate2018

    • Author(s)
      Mayumi Iijima, Kazuo Onuma
    • Journal Title

      Crystal Growth & Design

      Volume: 18 Issue: 4 Pages: 2279-2288

    • DOI

      10.1021/acs.cgd.7b01717

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Octacalcium phosphate overgrowth on β-tricalcium phosphate substrate in metastable calcium phosphate solution2018

    • Author(s)
      Mayumi Iijima, Kazuo Onuma
    • Journal Title

      Proceedings of Biomineralization XIV

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Artificial enamel induced by phase transformation of amorphous nanoparticles2017

    • Author(s)
      Kazuo Onuma, Mayumi Iijima
    • Journal Title

      Scientific Reports

      Volume: 7 Issue: 1 Pages: 2711-2711

    • DOI

      10.1038/s41598-017-02949-w

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nanoparticles in β-tricalcium phosphate substrate enhance modulation of and structure and composition of an octacalcium phosphate grown layer2017

    • Author(s)
      Kazuo Onuma, Mayumi Iijima
    • Journal Title

      CrystEngComm

      Volume: 19 Issue: 44 Pages: 6660-6672

    • DOI

      10.1039/c7ce01563a

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Oriented Hydroxyapatite Nanorod Array on Amorphous Nanoparticle Substrate2017

    • Author(s)
      Kazuo Onuma, Mayumi Iijima
    • Organizer
      Biomineralization XIV
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Octacalcium phosphate overgrowth on β-tricalcium phosphate substrate in metastable calcium phosphate solution2017

    • Author(s)
      Mayumi Iijima, Kazuo Onuma
    • Organizer
      Biomineralization XIV
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] β-TCP基材とOCP結晶層を含む複合体及びその製造方法2019

    • Inventor(s)
      小沼 一雄
    • Industrial Property Rights Holder
      産業技術総合研究所
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-546681
    • Filing Date
      2019
    • Related Report
      Products Report
  • [Patent(Industrial Property Rights)] 人工エナメル質の形成方法2019

    • Inventor(s)
      小沼 一雄
    • Industrial Property Rights Holder
      産業技術総合研究所
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-512410
    • Filing Date
      2019
    • Related Report
      Products Report
  • [Patent(Industrial Property Rights)] アモルファスナノ粒子の相転移を利用した人工エナメル質の迅速作成技術開発2018

    • Inventor(s)
      小沼一雄
    • Industrial Property Rights Holder
      小沼一雄
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2018-051417
    • Filing Date
      2018
    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] アモルファスナノ粒子の相転移を利用した人工エナメル質の迅速作成技術開発2017

    • Inventor(s)
      小沼一雄
    • Industrial Property Rights Holder
      小沼一雄
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2017-080505
    • Filing Date
      2017
    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] β-TCP基板上へのOCP結晶層の作成及び成長層の構造と組成の制御2017

    • Inventor(s)
      小沼一雄
    • Industrial Property Rights Holder
      小沼一雄
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2017-195340
    • Filing Date
      2017
    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2021-07-06  

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