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Property of sintering zirconia ceramics that is important for metal-free bridge restoration

Research Project

Project/Area Number 18592142
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 InstitutionShowa University

Principal Investigator

TAMAKI Yukimichi  Showa University, Oral Biomat. & Tech., Associate Professor (80197566)

Co-Investigator(Kenkyū-buntansha) FUJISHIMA Akihiro  Showa Univ, Oral Biomat. & Tech., Lecturer (50209045)
HOTTA Yasuhiro  Showa Univ, Oral Biomat. & Tech., Lecturer (00245804)
Project Period (FY) 2006 – 2007
Project Status Completed (Fiscal Year 2007)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥270,000)
Fiscal Year 2007: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2006: ¥2,600,000 (Direct Cost: ¥2,600,000)
Keywordszirconia / CAD / CAM / fit / metal-free restoration / mechanical property / 曲げ強さ / セラミックス / ブリッジ / 適合性
Research Abstract

Zirconium oxide (Zirconia: ZrO_2) has been expected as a new ceramics material because metal-free restoration is available in dentistry. However, it is well-known that zirconia contracted with sintering process at the high temperature. Additionally, zirconia was too hard to form the complex design by cutting tool. The purpose of this study was to investigate the marginal and internal fit of CAD/CAM-fabricated zirconia frameworks. Furthermore, mechanical property was also investigated under the storage in the thermal stress with 20, 000 cycle. Single crown copings (A: abutment), three-unit bridge frameworks (APA, P: pontic), four-unit bridge frameworks (APPA), and five-unit bridge frameworks (A_1P_1A_2P_2A_3) were fabricated with raw-stage zirconia blanks using a commercial CAD/CAM system(KATANA[○!R], Noritake Dental Supply Co. Ltd., Aichi, Japan). Crown copings and frameworks were cemented to their respective master abutment models, and thickness of the cement layer was measured at specific measuring points. Marginal and internal fit of both APA and APPA were within clinical acceptance. However, the marginal gap and thickness of the cement layer on the axial surface of the pontic side of APA and APPA were slightly higher than those of the non-pontic side. As for the marginal gap of A_1P_1A_2P_2A_3 framework, it was superior to those of APA and APPA because the center abutment supported the framework to prevent distortion. Consequently, the axis of the abutment portion (A2) of the framework was kept vertical, thereby resulting in an excellent marginal fit for A2. Thus, findings of this study clearly showed that framework design was important to preventing distortion of long frameworks during post-machining sintering. On the other hand, the three point bending strength of zirconia bar after thermal cycling was less than that of bars stored in the atmosphere. Within this limited data, it was suspected that zirconia might be influenced by the storing environment.

Report

(3 results)
  • 2007 Annual Research Report   Final Research Report Summary
  • 2006 Annual Research Report
  • Research Products

    (9 results)

All 2007 2006

All Journal Article (3 results) (of which Peer Reviewed: 1 results) Presentation (6 results)

  • [Journal Article] Effect of Sintering on the Marginal and Internal Fit of CAD/CAM-fabricated Zirconia Frameworks2007

    • Author(s)
      Jun KUNII, Yasuhiro HOTIA, YUkimichi TAMAKI, et. al.
    • Journal Title

      Dental Materials Joumal 26

      Pages: 820-826

    • NAID

      110006557232

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
    • Peer Reviewed
  • [Journal Article] Effect of Sintering on the Marginal and Internal Fit of CAD/CAM-fabricated Zirconia Frameworks2007

    • Author(s)
      Jun, KUNII, Yasuhiro, HOTTA, Yukimichi, TAMAKI, et. al
    • Journal Title

      Dental Materials Journal 26(6)

      Pages: 820-826

    • NAID

      110006557232

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Journal Article] CAD/CAMを用いたセラミックブリッジ-ジルコニアコーピングの適合性2006

    • Author(s)
      国井 淳, 堀田康弘, 玉置幸道, 嶋倉裕介, 川和忠治, 宮崎 隆
    • Journal Title

      歯科材料・器械 25巻・5号

      Pages: 389-389

    • NAID

      130006963394

    • Related Report
      2006 Annual Research Report
  • [Presentation] Effects of Post-sintering on the Axial Surface Fit of CAD/CAM Fabricated Zirconia Frameworks2007

    • Author(s)
      J.KUNII
    • Organizer
      2007 IDMC
    • Place of Presentation
      Bangkok,Thaialld
    • Year and Date
      2007-11-24
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Effects of Post-sintering on the Axial Surface Fit of CAD/CAM Fabricated Zirconia Frameworks2007

    • Author(s)
      Jun, KUNII, Yasuhiro, HOTTA, Yukimichi, TAMAKI, et. al
    • Organizer
      International Dental Materials Congress 2007
    • Place of Presentation
      Bangkok, Thailand
    • Year and Date
      2007-11-24
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Form Reproductivity and Conformity of Different Preparation Model Using Developed Digitizing Software2007

    • Author(s)
      堀田 康弘
    • Organizer
      2007International Dental Material Congress
    • Place of Presentation
      タイ・バンコク
    • Year and Date
      2007-11-24
    • Related Report
      2007 Annual Research Report
  • [Presentation] CAD/CAMを用いたセラミックブリッジ2007

    • Author(s)
      国井 淳
    • Organizer
      第49回日本歯科理工学会
    • Place of Presentation
      札幌コンベンションセンター
    • Year and Date
      2007-05-12
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] Ceramic bridge fabricated by CAD/CAM -Change in Accuracy according to various bridge models2007

    • Author(s)
      Jun, KUNII, Yasuhiro, HOTTA, Atsushi, Ozawa, Akihirio, FYJISHIMA, Yukimichi, TAMAKI, et. al
    • Organizer
      The Journal of the Japanes Society for Dental Materials and Devices
    • Place of Presentation
      Sapporo, Hokkaido
    • Year and Date
      2007-05-12
    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2007 Final Research Report Summary
  • [Presentation] CM/CAMを用いたセラミックブリッジ-各種ブリッジ形態による適合性-2007

    • Author(s)
      国井 淳
    • Organizer
      第49回日本歯科理工学会学術講演会
    • Place of Presentation
      札幌コンベンションセンター
    • Year and Date
      2007-05-12
    • Related Report
      2007 Annual Research Report

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Published: 2006-04-01   Modified: 2016-04-21  

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