Dissociation States of Collagen Functional Groups and their Effects on the Priming Efficacy of HEMA Bonded to Collagen
N. Nishiyama1,*,
K. Suzuki2,
A. Nagatsuka1,
I. Yokota1, and
K. Nemoto1
1 Department of Dental Materials, Nihon University, School of Dentistry at Matsudo, 870-1 Sakaecho, Nishi 2, Matsudo, Chiba 271-8587, Japan; and
2 Department of Biomaterials, Okayama University, Graduate School of Medicine and Dentistry, 2-5-1 Shikadacho, Okayama, Okayama 700-8525, Japan;
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Figure 1A. Liquid-state 13C NMR spectra of the collagen, before and after heat treatment. The accumulation and repetition times were 84,000 and 3.8 sec, respectively. The hexamethyl-di-siloxane was used as an external reference. The upper spectrum was obtained before heat treatment. The lower spectrum was obtained after heat treatment.
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Figure 1B. Titration curves for the functional group of the side-chain amino acid residues in the collagen macromolecule. (I) Titration curve for the carboxylic acid of the collagen functional group. (II) Titration curve for the amine of the collagen functional group.
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Figure 1C. Dissociation states for the carboxylic acid and amine of the side-chain amino acid residues in the collagen macromolecule.
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Figure 2. Bond strength of resin to etched dentin primed by HEMA solutions with various pH values of the aqueous solution for the HEMA primer. Error bar shows SD. Dashed line represents the bond strength when Clearfil New Bond was applied to etched dentin without any primer pre-treatment. Solid line represents the bond strength when the dentin was conditioned with Clearfil SE Bond primer instead of 40% phosphoric acid.
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Figure 3. SEM views of the resin-dentin interface with various pH values of the aqueous solution for HEMA primer. Magnification: 5000 times. CR: Composite resin. H: Hybrid layer. Non-treated: Clearfil New Bond was applied to etched dentin without any primer pre-treatment. Clearfil SE Bond primer: After the ground dentin was conditioned with Clearfil New Bond primer, Clearfil New Bond and Clearfil SE-II were applied to the primed dentin. Treated: Etched dentin primed with HEMA solutions of different pH values. pH = 1.5: Distilled water ionized by HCl. pH = 6.6: Distilled and de-ionized water was used. pH = 12.0: Distilled water ionized by NaOH.
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