2006 Fiscal Year Final Research Report Summary
Effect of solvent in 1-step self-etching adhesives on degree of conversion and long-term durability
| Project/Area Number |
16591904
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Conservative dentistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
IKEDA Takatsumi Hokkaido Univ., Grad. School of Dent., Inst., 大学院歯学研究科, 助手 (90222885)
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| Co-Investigator(Kenkyū-buntansha) |
TANAKA Toru Hokkaido Univ., Grad. School of Dent., Inst., 大学院歯学研究科, 助手 (90179771)
INOUE Satoshi Hokkaido University, Hospital, Lec., 大学病院, 講師 (80184745)
SANO Hidehiko Hokkaido Univ., Grad. School of Dent., Prof., 大学院歯学研究科, 教授 (90205998)
SHIRAI Kenichi Hiroshima Univ., Grad. School of Biomedical Sciences, Inst., 大学院医歯薬学総合研究科, 助手 (20325179)
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| Project Period (FY) |
2004 – 2006
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| Keywords | adhesive system / solvent / air-drying / tensile strength |
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| Research Abstract |
Objective. The objectives of the present study were 1) to clarify the relationship between the duration of air-drying for one-step self-etch adhesives (1-SEA) and evaporation degree (ED) of solvents, and 2) to evaluate the effect of ED on the ultimate micro-tensile strength (UTS) of the adhesives. Methods. The ED of three 1-SEA, iBond (Heraus kulzer), G-BOND (GC) and S3 BOND (kuraray), after 0, 5 and 10 sec air-drying was decided by gravimetric method. After that, the UTSs of the adhesives at ED equivalent to 0, 5 and 10 sec air-drying were evaluated. Results. EDs were increased by extension of air-drying time. As for the comparison between the adhesives, iBond showed the largest ED, and followed by G-BOND and S3 BOND. Regarding UTS, longer air-drying time resulted in larger UTS. In comparison between the adhesives, S3 BOND (HEMA containing adhesive) showed larger UTS than the other two adhesives (HEMA-free adhesives). Significance. Air-drying had a significant effect to remove solvents included in 1-SEAs and to achieve larger UTS of them. Hence, it might be crucial to remove solvents as much as possible by thorough, strong air-drying for firmly hardened adhesive layer at the interface.
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