Effect of esthetic restorative materials and abutment tooth contamination on the adhesive properties of resin cements

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K16975
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 57030:Conservative dentistry-related
• Research Institution: Nihon University
• Principal Investigator: ISHII Ryo 日本大学, 歯学部, 助教 (20755144)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: 唾液汚染 / レジンセメント / 表面自由エネルギー / 接着強さ / セラミックス / CAD/CAM用ハイブリットレジン / 支台歯

Outline of Final Research Achievements

Esthetic crown restorations require the integration of the restoration and abutment tooth using adhesive resin cement. On the other hand, salivary contamination of the restoration during intraoral placement may reduce the adhesion of the restoration to the resin cement. However, no effective technique has been established. Therefore, we investigated the effect of salivary contamination on the abutment tooth on the adhesion of resin cement by using surface free energy as an index. As a result, the adhesive strength of resin cement to abutment teeth was decreased by salivary contamination, but was restored by the use of surface treatment materials containing functional monomers or phosphoric acid. The surface free energy was also decreased by salivary contamination, but was restored by each surface treatment.

Free Research Field

保存治療系歯学

Academic Significance and Societal Importance of the Research Achievements

本研究は，表面自由エネルギーを指標として，唾液汚染および表面処理後の修復物および支台歯に対するレジンセメントの接着機構に客観的指標を与えるという学術的意義を有している。その結果，従来の接着試験等の力学的強度試験とは異なり，接着界面で生じている現象を正確に反映した結果を得られた。また，支台歯の唾液汚染がレジンセメントの接着性に及ぼす影響を明らかにしたことで，確実な臨床術式の確立，修復物の寿命予測における貴重な知見となった。また，これらの適切な情報を学会発表および学術論文により，社会的状況を鑑みても不要な再修復を減少させることで健康寿命の延伸という目標に，口腔領域から貢献できたものと考えられる。