A Study on the Demineralization Capacity of One-step Bonding Agent

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  • Kou FUJITA
    Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
  • Hitoshi IWAI
    Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
  • Hirotoshi IWAI
    Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
  • Tamami OKADA
    Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
  • Hideaki SUZUKI
    Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
  • Toshikazu UCHIYAMA
    Department of Renascent Dentistry, Nihon University School of Dentistry at Matsudo
  • Norihiro NISHIYAMA
    Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo
  • Satoshi HIRAYAMA
    Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo

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Other Title
  • ワンステップボンディング材の歯質脱灰能に関する研究

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Abstract

 Purpose: In this study, the interaction between the acidic monomer MDP employed in G-BOND PLUS (G-BP) and enamel or dentin was examined in detail by comparing the changes in the carbon 13 nuclear magnetic resonance (13C NMR) spectrum obtained before and after reaction with enamel and dentin particles using a solid-state and liquid-state carbon 13C NMR technique, to obtain information on the byproducts produced by enamel and dentinal decalcification. The effect of the demineralization ratio of tooth apatite by acidic monomer MDP on the shear bond strength to enamel and dentin was also examined.<br> Methods: Bovine crown enamel particles or bovine crown dentin particles of 0.200 g were suspended in 1.000 g of G-BP, and the suspensions were vibrated for 10, 20, 60, 1,800, or 3,600 seconds. After centrifuging these suspensions, liquid-state 13C NMR spectra of the supernatant solution of G-BP were observed using an EX270 spectrometer. The ratio of intensity of the NMR peak of the vinyl methylene carbon for acidic monomer MDP employed in G-BP to the NMR peak of that for TEGDMA detected in the 13C NMR spectrum was determined before and after reaction with enamel or dentin particles. The reduction in the peak intensity for MDP was determined by dividing the difference in the intensity ratio obtained before and after reaction by the intensity ratio obtained before reaction. The reduction was determined as the ratio of demineralization of tooth apatite by MDP. Furthermore, the bond strength of G-BP to ground enamel and dentin was measured.<br> Results: When the enamel or the dentin interfaced to G-BP, the intensity of the NMR peak that assigned to a vinyl methylene group of MDP was decreased. The reaction of 3,600 seconds later, the enamel was demineralized 66.50%, the dentin was demineralized 89.50%. Ca salt precipitated from reaction residual substance of G-BP and tooth substance apatite was found. If the reaction time of G-BP became longer time, increases in the amount of MDP increased the relative intensity amount of MDP-Ca salt the relative intensity ratio of NMR peak “g1” to the NMR peak “g2”. The demineralized ratio increased that until reacted with 20 seconds, and the bond strength increased for it slightly. However, later than 60 seconds of reaction, the bond strength of enamel was 15.53 MPa, and those of dentin was 10.39 MPa.<br> Conclusions: The amount of demineralization of MDP in dentin was higher than that of enamel. The bond strength to tooth apatite showed that the bond strength to enamel was higher than to dentin.

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