Studies on Adhesion of Functional Monomers with SH Group to Tooth Substrates and Dental Alloys

DOI 14 Citations
  • KOJIMA Katsunori
    Division of Organic Materials, Institute for Medical and Dental Engineering Tokyo Medical and Dedtal University

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  • SH基を有する官能性モノマーの歯質および歯科用合金への接着に関する研究

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In the course of studies to prepare new functional monomers which improve adhesive properties of MMA-PMMA/TBBO resin to teeth or metals, the N-(4-mercaptophenyl)methacrylamide(MPMA)monomer was found.The monomer enhances adhesive strength to teeth, gold, palladium, copper, iron and dental alloys.MMA-PMMA/TBBO resin exhibited excellent adhesion when MPMA monomer was applied as a liner to human enamel or dentin treated with 10% citric acid aqueous solution containing 3% of either ferric chloride or cupric chloride.The monomer provides firm adhesion to gold, palladium, copper, and iron as well as teeth.Especially, the adhesion to palladium and gold-silver-palladium alloys was found to be stable and durable.On the other hand, N-(4-mercaptophenyl)isobutylamide(MPIA)which does not possess double bonds for polymerization but has a mercapto group did not show sufficient adhesion to palladium surfaces coated with the liner.This clearly demonstrates that compounds used as liners in MMA-PMMA/TBBO resin system must possess a double bond for copolymerization in order to improve adhesive properties.In the case of the N-phenylmethacrylamide monomer which has a similar structure to MPMA, but without a mercapto group, durable and stable adhesion was not obtained by coating the monomer as a liner.It is especially worth noting that the chemical bond between MPMA and palladium was confirmed by ESCA analysis, after the surface of palladium was washed by acetone followitng the coating treatment.On the basis of the results, it was proved that MPMA exhibits durable and strong adhesion to dental gold-silver-palladium alloys due to the copolymerization with MMA-PMMA/TBBO resin.

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