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Journal of Dental Research
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Biomaterials & Bioengineering

Influence of the Chemical Structure of Functional Monomers on Their Adhesive Performance

K.L. Van Landuyt1, Y. Yoshida2, I. Hirata3, J. Snauwaert4, J. De Munck1, M. Okazaki3, K. Suzuki2, P. Lambrechts1 and B. Van Meerbeek1,*

1 Leuven BIOMAT Research Cluster, Department of Conservative Dentistry, School of Dentistry, Oral Pathology and Maxillo-Facial Surgery, Catholic University of Leuven, Kapucijnenvoer 7, BE-3000 Leuven, Belgium;
2 Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Okayama 700-8525, Japan;
3 Department of Biomaterial Science, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima 734-8553, Japan; and
4 Department of Chemistry, Catholic University of Leuven, Celestijnenlaan 200G, BE-3001 Heverlee, Belgium

Correspondence: * corresponding author, bart.vanmeerbeek{at}med.kuleuven.be

Functional monomers in adhesive systems can improve bonding by enhancing wetting and demineralization, and by chemical bonding to calcium. This study tested the hypothesis that small changes in the chemical structure of functional monomers may improve their bonding effectiveness. Three experimental phosphonate monomers (HAEPA, EAEPA, and MAEPA), with slightly different chemical structures, and 10-MDP (control) were evaluated. Adhesive performance was determined in terms of microtensile bond strength of 4 cements that differed only for the functional monomer. Based on the Adhesion-Decalcification concept, the chemical bonding potential was assessed by atomic absorption spectrophotometry of the dissolution rate of the calcium salt of the functional monomers. High bond strength of the adhesive cement corresponded to low dissolution rate of the calcium salt of the respective functional monomer. The latter is according to the Adhesion-Decalcification concept, suggestive of a high chemical bonding capacity. We conclude that the adhesive performance of an adhesive material depends on the chemical structure of the functional monomer.

Key Words: adhesion • adhesive • functional monomer • phosphonate • polarity • chemical bonding

Journal of Dental Research, Vol. 87, No. 8, 757-761 (2008)
DOI: 10.1177/154405910808700804
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