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Effect of hydrophobic treatments on basic physical properties of cellulose nanofibers for a dental material

Research Project

Project/Area Number 18K09652
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 57050:Prosthodontics-related
Research InstitutionTohoku University

Principal Investigator

Yokoyama Masayoshi  東北大学, 歯学研究科, 大学院非常勤講師 (20396500)

Co-Investigator(Kenkyū-buntansha) 小川 徹  東北大学, 歯学研究科, 准教授 (50372321)
洪 光  東北大学, 歯学研究科, 教授 (70363083)
濱田 泰三  東北大学, 歯学研究科, 学術研究員 (50034244)
佐々木 啓一  東北大学, 歯学研究科, 教授 (30178644)
日原 大貴  東北大学, 歯学研究科, 助教 (60781292)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsセルロースナノファイバー / 義歯床用材料 / アクリリックレジン / 脱石油歯科材料 / アクリルレジン
Outline of Final Research Achievements

The aim was to evaluate the basic mechanical properties of a pure cellulose nanofiber (CNF) specimen compared with a commercial denture base material (PMMA acrylic resin). Pure CNF specimens fabricated under various conditions were examined. The flexural strength (FS) and flexural modulus (FM) values of the specimens were measured by a three-point bending test. The morphologies of the fractured surfaces were examined using SEM.
The hydrophobic treatment with an anionic surface sizing agent did not improve their water absorption. The hydrophobic specimens with substitution by methanol favorably affected the mechanical properties of the CNFs. The pure CNF specimen fabricated under particular conditions had higher FS and FM values than the control, which suggests that CNFs have potential as a "petroleum-free" alternative to acrylic resin denture base materials. The pure CNF is potentially useful as a denture base material, which is assumed to be applicable to CAD/CAM.

Academic Significance and Societal Importance of the Research Achievements

現在,義歯床など歯科材料としてPMMAを代表とするレジン系材料が,操作性,加工性,強度等材料学的特性から長きにわたり歯科臨床で重用されている.しかし長期使用による吸水,乾燥や過重による破折・破損など,材料学的な問題点がある.また口腔内微生物の侵入,繁殖等による口腔衛生環境面での為害作用,さらに石油由来の化学物質であるためアレルギーなどの生体為害性など,材質そのものに由来する懸念事項も多く存在する.また自然環境下での分解性がなく焼却すると有毒ガス発生等の環境への問題,原油埋蔵量に限りがあるといった問題点も挙げられる.そのため,石油由来ではない新素材による歯科用材料の開発の意義は非常に大きい.

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (2 results)

All 2021 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results)

  • [Journal Article] Potential of pure cellulose nanofibers as a denture base material2021

    • Author(s)
      Yamazaki Y, Ito T, Ogawa T, Hong G, Yamada Y, Hamada T, Sasaki K.
    • Journal Title

      Journal of Oral Science

      Volume: 63 Issue: 1 Pages: 111-113

    • DOI

      10.2334/josnusd.20-0245

    • NAID

      130007959199

    • ISSN
      1343-4934, 1880-4926
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Presentation] セルロースナノファイバー成形体への疎水性付与についての検討2019

    • Author(s)
      伊藤多佳男,山崎友起子,小川 徹, 洪 光,田中裕之,橋場洋美,相澤將之,平田広一郎,坂田英武,夕田貞之,和田訓,樋口鎮央,濱田泰三,佐々木啓一
    • Organizer
      公益社団法人日本補綴歯科学会 第128回学術大会
    • Related Report
      2019 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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