Analysis of Adhesion Mechanism of Functional Monomers at the Adhesive Interface of Dental Alloys

2020 Fiscal Year Final Research Report

• Project/Area Number: 19K19142
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57050:Prosthodontics-related
• Research Institution: Nihon University
• Principal Investigator: HIRABA Haruto 日本大学, 歯学部, 助教 (00800989)
• Project Period (FY): 2019-04-01 – 2021-03-31
• Keywords: 接着 / 機能性モノマー / 表面処理 / 歯科用金属 / 歯学

Outline of Final Research Achievements

Surface treatment of dental precious metal alloys with organosulfur compounds is effective in improving the bond strength. Many noble-metal alloys contain copper to improve their mechanical properties. This study compared the interaction between the altered copper surface and the functional monomer. The copper oxide surface significantly increased the effectiveness of an acidic functional monomer to shear-bond strengths, while a sulfur-containing monomer was significantly reduced. The surface of the copper immersed as the oxide film eliminated, remarkably increasing and decreasing the effectiveness of a sulfur-containing monomer and an acidic functional monomer, respectively, to improve shear-bond strength. The present results could suggest that sulfur-containing and acidic functional monomers were better to combine after alumina-based airborne-particle abrasion when bonding copper-containing noble-metal alloys with an acrylic resin.

Free Research Field

歯科補綴学

Academic Significance and Societal Importance of the Research Achievements

8020運動により、患者から残存歯を可能な限り削らないで欲しいという要望は年々高まっている。近年、保険収載された接着ブリッジは、歯質の削合が非常に少なく少数歯欠損症例に対して、多くの歯質の保存が可能となる一方で、接着に対する専門的な知識や煩雑な操作を必要とする場面が多い。本研究の結果から、補綴装置のフレームワークに銅を含有する歯科用貴金属合金を用いた際に、強固な接着を得る術式として、洗浄と粗造化を目的としたアルミナブラスト処理によって酸化した銅の効果を得るために、酸性機能性モノマーを有機硫黄化合物と組み合わせて表面処理に用いることを推奨できることを示唆するものであった。