In experimental urethane-based visible-light-cured(VLC) resins containing a diluent monomer, a lower value of activation energy for polymerization than in bis-GMA-based VLC resin was obtained. A greater increased diametral tensile strength and slightly larger compression strength were observed. The diluent monomer in the urethane-based VLC resins gives an increase of strength, associated with lower activation energy for polymerization, compared with the bis-GMA-based resin.
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Wakasa, K., Urabe, H., Taira, M. et al. Mechanical strength of urethane-based visible-light-cured resins. J Mater Sci: Mater Med 4, 404–406 (1993). https://doi.org/10.1007/BF00122199
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DOI: https://doi.org/10.1007/BF00122199