Influence of Carbon Chain Length of Fluorinated Alkyl Acrylate on Mechanical Properties of Denture Base Resin

概要

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Hayashi et al. recently succeeded in preparing a filling polymer composed of methyl methacrylate and perfluorooctylethyl acrylate (C8F). They suggested that the addition of C8F-added polymer beads could inhibit bacterial adherence to the surface of denture base resin. The objective of this study was to examine the influence of carbon chain length of fluorinated alkyl acrylate on mechanical properties of test specimens ; perfluorobutylethyl acrylate (C4F), perfluorohexylethyl acrylate (C6F), C8F and perfluorodecylethyl acrylate (C10F) were used as fluorinated alkyl acrylates. The glass transition temperature of test specimens appeared to be greater as carbon chain length of fluorinated alkyl acrylate increased. Knoop hardness was lowest in C6F-added specimens (C6FA), while all test specimens gave lower values than the control. The direct tensile strengths of fluoromonomer-added specimens were lower than the control, while relatively lower strengths were seen in C6FA or C8F-added specimens (C8FA). Although Knoop hardness and direct tensile strength decreased after addition of fluorinated alkyl acrylates, these mechanical properties remained within the limits recommended by the Japanese Society for Dental Materials and Devices for denture base resin. This study suggests that the new denture base resin is clinically acceptable with regard to mechanical properties.