A study on abutment construction for the zirconia bridge in consideration of the protection of the root and periodontal tissue

• Project/Area Number: 24792061
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Prosthetic dentistry
• Research Institution: Tokyo Medical and Dental University
• Principal Investigator: KOMADA Wataru 東京医科歯科大学, 歯学部附属病院, 講師 (10447493)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000); Fiscal Year 2014: ¥260,000 (Direct Cost: ¥200,000、Indirect Cost: ¥60,000); Fiscal Year 2013: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2012: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
• Keywords: 支台築造 / グラスファイバーポスト / ジルコニア / ひずみゲージ / 冠橋義歯

Outline of Final Research Achievements

The purpose of this study was to evaluate the surface strain of zirconia fixed partial denture frameworks and their abutment roots when restored with two types of post and core materials. Artificial mandibular first premolars and second molars were used as the abutment teeth. Posts and cores were of two types: resin composite with glass fiber posts (RC) and cast platinum gold alloy (MC). The cores and 4-unit zirconia frameworks were bonded to the specimens. Static loading was applied to the occlusal surfaces, and the surface strain of the frameworks and roots (distal premolar and mesial molar) was measured by strain gauge method. Premolar root showed a significantly higher magnitude of principal strain than molar root. RC showed a significantly higher magnitude of principal strain than MC. The results suggest that MC restrain the surface strain compared to RC when the missing teeth are replaced by a 4-unit zirconia framework.

Research Products

• [Journal Article] Influence of post and core materials on distortion around 4-unit zirconia bridge margins. (2014)
  • Author(s): Inagaki T, Komada W, Nemoto R, Yoshida K, Miura H.
  • Journal Title: Dental Materials Jornal Volume: 33 Pages: 373-382
  • NAID: 130004519333
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Influence of post and core materials on distortion around 4-unit zirconia bridge (2014)
  • Author(s): Tasuku INAGAKI, Wataru KOMADA, Reina NEMOTO, Keiichi YOSHIDA and Hiroyuki MIURA
  • Journal Title: Dental Materials Journal Volume: 未定
  • Peer Reviewed
• [Presentation] Surface strain of abutment roots restored with 4-unit zirconia bridge (2012)
  • Author(s): T.Inagaki, W.Komada, R.Nemoto, Y.Fukui, H.Miura
  • Organizer: The 60th Annual Meeting of Japanese Association for Dental Research
  • Place of Presentation: 新潟
• [Presentation] ４ユニットジルコニアブリッジへの荷重時の表面ひずみに関する研究
  • Author(s): 稲垣祐久，駒田亘，根本怜奈，福井雄二，三浦宏之
  • Organizer: 第４回日本歯科CAD/CAM学会学術大会
  • Place of Presentation: 東京
• [Presentation] ４ユニットジルコニアブリッジへの荷重時の表面ひずみに関する研究
  • Author(s): 稲垣祐久，駒田亘，根本怜奈，福井雄二，三浦宏之
  • Organizer: 第4回日本歯科CAD/CAM学会学術大会
  • Place of Presentation: 東京