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Application of titanium alloys to porcelain fused to metal crown

Research Project

Project/Area Number 13470409
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 補綴理工系歯学
Research InstitutionTohoku University

Principal Investigator

YODA Masanobu  Tohoku University, Graduate School of Dentistry, Associate Professor, 大学院・歯学研究科, 助教授 (70005073)

Co-Investigator(Kenkyū-buntansha) TAKADA Yukyo  Graduate School of Dentistry, Assistant Professor, 大学院・歯学研究科, 助手 (10206766)
KIMURA Kohei  Graduate School of Dentistry, Professor, 大学院・歯学研究科, 教授 (40108551)
KONNO Tatsuhiko  School of Dentistry Dental Hospital, Assistant Professor, 歯学部附属病院, 助手 (80282143)
OKUNO Osamu  Graduate School of Dentistry, Professor, 大学院・歯学研究科, 教授 (50014080)
Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥4,300,000 (Direct Cost: ¥4,300,000)
Fiscal Year 2002: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 2001: ¥3,400,000 (Direct Cost: ¥3,400,000)
Keywordstitanium alloy / porcelain fused to metal crown / bond strength to porcelain / thermal expansion / shrinkage
Research Abstract

Titanium is an attractive dental restorative material because of its excellent characteristics, however it is difficult to cast. Beta-stabilized titanium alloys have lower fusion temperatures than pure titanium. For dental clinical use, these alloys must be able to bond to dental porcelains because of the esthetic demands of dentistry. Eighteen binary titanium alloys were examined : Ti-Cr (15, 20, 25 wt%), Ti-Pd (15, 20, 25 wt%), Ti-Ag (10, 15, 20 wt%), Ti-Cu (5, 10 wt%), Ti-Fe (5, 10, 15 wt%) and Ti-Mn (5, 10, 15, 20 wt%). As controls, pure titanium and a gold alloy were also examined. Bond strengths were evaluated according to ISO 9693. The elastic modulus was also measured for each. The titanium alloy composition had a significant effect on alloy elastic modulus, but it had little effect on the bond strength to porcelain. The bond strengths for all the experimental alloys were similar to those of the two control alloys (Pure titanium and gold alloy) and were higher than 25 MPa, the minimum value specified in ISO 9693. These findings indicate that the experimental alloys exhibited sufficient shear bond strength for use in metal-ceramic restorations.
In this study, some specimens (Ti-15wt%Pd and Ti-20wt%Pd) deflected upon cooling, even after the bond test. The thermal expansion value of these alloys was not much different from that of the other alloys. The next study investigated the cause of this deflection by analyzing the thermal expansion/shrinkage curve.
Because the beta to alpha phase transformation and the stress developed from the shrinkage of the porcelain simultaneously occurred, these alloys were permanently deformed (I.e., they underwent creep), resulting in the deflected specimens.

Report

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

    (5 results)

All Other

All Publications (5 results)

  • [Publications] Masanobu Yoda, Tatsuhiko Konno, Yukyo Takada et al.: "Bond strength of binary titanium alloys to porcelain"Biomaterials. 22・12. 1675-1681 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yukyo TAKADA, Hiroshi NAKAJIMA, Osamu OKUNO, Toru OKABE: "Microstructure and Corrosion Behavior of Binary Titanium Alloys with Beta-stabilizing Elements"Dental Materials Journal. 20・1. 34-52 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Masanobu Yoda, Tatsuhiko Konno, Yukyo Takada, Kazunori Iijima, Jason Griggs, Osamu Okuno, Kohei Kimura, Toru Okabe: "Bond strength of binary titanium alloys to porcelain"Biomaterials. 22-12. 1675-1681 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yukyo TAKADA, Hiroshi NAKAJIMA, Osamu OKUNO and Toru OKABE: "Microstructure and Corrosion Behavior of Binary Titanium Alloys with Beta-stabilizing Elements"Dental Materials Journal. 20-1. 34-52 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Masanobu Yoda, Tatsuhiko Konno, Yukyo Takada et al.: "Bond strength of binary titanium alloys to porcelain"Biomaterials. 22・12. 1675-1681 (2001)

    • Related Report
      2001 Annual Research Report

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

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