1999 Fiscal Year Final Research Report Summary
Long-durable bonding of resin to dentin
| Project/Area Number |
09557151
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Conservative dentistry
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| Research Institution | Tokyo Medical and Dental University |
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Principal Investigator |
NAKABAYASHI Nobuo Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 生体材料工学研究所, 教授 (30014020)
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| Co-Investigator(Kenkyū-buntansha) |
WATANABE Akihiko Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 生体材料工学研究所, 助手 (30126263)
IWASAKI Yasuhiko Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 生体材料工学研究所, 助教授 (90280990)
ISHIHARA Kazuhiko Graduate School of Engineering, The University of Tokyo, 大学院・工学系研究科, 助教授 (90193341)
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| Project Period (FY) |
1997 – 1999
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| Keywords | Dentin bonding / Hybridized dentin / Wet-bonding / Adhesion to dentin / Tensile test / Dumbbell |
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| Research Abstract |
Bonding of 4-methacryloyloxyethyl trimellitate anhydride in methyl methacrylate initiated by tri-n-butyl borane in the presence of poly(methyl methacrylate) (4-META/MMA-TBB resin) to dentin via hybridizatin of impregnated monomers that polymerize in situ was first described by Nakabayashi et al. in 1982. This concept was accepted in worldwide and many bonding systems were developed since then.
Longevity of bonding is essential for dental treatments. Many dental people do not understand that demineralized dentin accepts hydrolysis in mouth event it is mainly composed of collagen. Complete hybridization is keen to provide long-durable bond to dentin but it has been difficult to eliminate the demineralized dentin. Monomer permeability of demineralized dentin is as important as diffusibility of monomers to dissolve this problem. The effects of etchants and/or primers on wet-bonding to dentin were examined. The morphological change of demineralized dentin after contact with chemicals was observed by atomic force microscope. The pretreatment of tooth substrate to obtain durable bonding to dentin was proposed in this research. We also advise that the bonding test using mini-dumbbell specimens is essential to identify defects in bonded specimens, which are impossible by conventional test specimens.
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