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Selected physicochemical properties of the experimental endodontic sealer

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Abstract

This study explores water sorption, hygroscopic expansion, mechanical strength and ion release from the experimental amorphous calcium phosphate (ACP) composites formulated for application as endodontic sealers. Light-cure (LC) and dual-cure (DC; combined light and chemical cure) resins comprised urethane dimethacrylate (UDMA), 2-hydroxyethyl methacrylate (HEMA), methacryloyloxyethyl phthalate (MEP) and a high molecular mass oligomeric co-monomer, poly(ethyleneglycol)-extended UDMA (PEG-U) (designated UPHM resin). To fabricate composites, a mass fraction of 60% UPHM resin was blended with a mass fraction of 40% as-made (am-) or ground (g-) ACP. Glass-filled composites were used as controls. Both DC and LC ACP UPHM composites exhibited relatively high levels of water sorption accompanied by a significant hygroscopic expansion. The latter may potentially be useful to offset high polymerization stresses that develop in these materials. Ion release profiles of the experimental materials confirmed their potential for regeneration of mineral-deficient tooth structures. Their moderate to low mechanical strength after 3 months of aqueous immersion did not diminish the enthusiasm for the proposed use as endodontic sealers. For that application, DC g-ACP composites appear to be the most adequate, but micro-leakage and quantitative leachability studies are needed to fully establish their suitability.

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Acknowledgements

This investigation was supported by Research Grant DE13169-10 from the National Institute of Dental and Craniofacial Research, the National Institute of Standards and Technology and the American Dental Association Foundation. We gratefully acknowledge Esstech, Essington, PA, USA for generously providing the monomers used in this study.

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Authors and Affiliations

  1. Paffenbarger Research Center, American Dental Association Foundation, National Institute of Standards and Technology, 100 Bureau Drive Stop 8546, Gaithersburg, MD, 20899-8546, USA

    J. I. Johns, J. N. R. O’Donnell & D. Skrtic

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  1. J. I. Johns
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  2. J. N. R. O’Donnell
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  3. D. Skrtic
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Correspondence to D. Skrtic.

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Disclaimer: Certain commercial materials and equipment are identified in this work for adequate definition of the experimental procedures. In no instance does such identification imply recommendation or endorsement by the American Dental Association Foundation or the National Institute of Standards and Technology, or that the material and the equipment identified is necessarily the best available for the purpose.

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Johns, J.I., O’Donnell, J.N.R. & Skrtic, D. Selected physicochemical properties of the experimental endodontic sealer. J Mater Sci: Mater Med 21, 797–805 (2010). https://doi.org/10.1007/s10856-009-3873-3

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  • DOI: https://doi.org/10.1007/s10856-009-3873-3

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