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The Effects of Cross-linking Agents on Some Properties of HEMA-based Resins

Department of Prosthetic Dentistry, Hiroshima University, School of Dentistry, 1-2-3, Kasumi, Minami-ku, Hiroshima, 734, Japan, Department of Restorative Dentistry, University of Newcastle upon Tyne, The Dental School, Framlington Place, Newcastle upon Tyne, NE2 4BW, United Kingdom

T. Hamada

Department of Prosthetic Dentistry, Hiroshima University, School of Dentistry, 1-2-3, Kasumi, Minami-ku, Hiroshima, 734, Japan

J.F. McCabe

Department of Restorative Dentistry, University of Newcastle upon Tyne, The Dental School, Framlington Place, Newcastle upon Tyne, NE2 4BW, United Kingdom

The use of 2-hydroxyethyl methacrylate (HEMA)-based polymer as a biocompatible material has been well-established. HEMA-based resins containing cross-linking agents have several potential clinical applications. It is hypothesized that the incorporation of cross-linking agent will improve the mechanical properties of HEMA-based polymers while reducing water absorption and solubility. The purpose of the work reported here was to test this hypothesis and to determine the most effective cross-linking agent.

A relationship among flexural strength, modulus, water absorption and solubility, and concentration of cross-linking agent was demonstrated. Strength and modulus tend to increase as the cross-linking agent concentration is increased, up to about 50%, after which the values level out or begin to fall. Water absorption drops with increasing cross-linking agent over the whole range of concentrations. Solubility tends to show a small decrease initially (up to 40%), followed by a noticeable increase as cross-linking agent concentration is increased. The trends were similar for all cross-linking agents, although there were differences in the absolute values in all properties depending upon the type of cross-linking agent used.

Key Words: denture base material • HEMA • cross-linking agent

Journal of Dental Research, Vol. 74, No. 9, 1597-1601 (1995)
DOI: 10.1177/00220345950740091501


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