The study of the new adhesive which combined hydroxyapatite

• Project/Area Number: 25861799
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Conservative dentistry
• Research Institution: Okayama University
• Principal Investigator: HOSHIKA Tomohiro 岡山大学, 大学病院, 助教 (20609953)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Project Status: Completed (Fiscal Year 2014)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2013: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: 象牙質 / 接着 / ハイドロキシアパタイト

Outline of Final Research Achievements

In this study, I examined the experimental bonding system that combined HAp with bonding resin of the self-etching system.
1).Influence on mechanical property：The increase of the ratio of HAp combination in resin showed a tendency to inhibit amount of absorbing water and elution.　2)．Influence in the dentin adhesion：There is no difference of the bond strength in same dentin group during the same storage period.In addition, the bond strength was the same by the comparison for 24 hours and for 12 months in each bonding groups.The microtensile bond strength for the decalcified dentin was significantly low in comparison with the sound dentin.　3)．Influence on pulp tissue：There was the graft that the formation of the dentinoid hard tissue was observed in the HAp combination adhesion system group.However, there is little number of the samples, and an additional experiment is necessary for the further examination of the observation period again.

Research Products

• [Journal Article] Effects of quaternary ammonium-methacrylates on the mechanical properties of unfilled resins. (2014)
  • Author(s): Hoshika T, Nishitani Y, Yoshiyama M, Key WO 3rd, Brantley W, Agee KA, Breschi L, Cadenaro M, Tay FR, Rueggeberg F, Pashley DH.
  • Journal Title: Dental Materials Volume: 30 Issue: 11 Pages: 1213-1223
  • DOI: 10.1016/j.dental.2014.08.365
  • Peer Reviewed / Open Access
• [Presentation] 新規ワンステップボンディング材における象牙質微小引張接着強さについて. (2014)
  • Author(s): 星加 知宏, 西谷 佳浩, 高橋 圭, 吉山 昌宏.
  • Organizer: 日本歯科保存学会2014年度秋季学術大会（第141回）
  • Place of Presentation: 山形テルサ（山形県山形市）
  • Year and Date: 2014-10-30
• [Presentation] Effects of incorporating cross-linking agent into all-in-one adhesives. (2014)
  • Author(s): Nishitani Y, Hoshika T, Yoshiyama M, Pashley D
  • Organizer: IADR-SEA Annual meeting 2014
  • Place of Presentation: Kuching(Malaysia)
  • Year and Date: 2014-08-13
• [Presentation] 新規光硬化型動揺歯固定材料の接着強さと接着耐久性の評価. (2014)
  • Author(s): 高橋 圭，星加 知宏，西谷 佳浩，吉山 昌宏
  • Organizer: 日本歯科保存学会2014年度春季学術大会（第140回）
  • Place of Presentation: 滋賀県立芸術劇場 びわ湖ホール(滋賀県大津市)
  • Year and Date: 2014-06-20