Inhibition of multispecies biofilms by a fluoride-releasing dental prosthesis copolymer

Academic Article


  • Objectives This study aimed to develop a new mixed-species acidogenic biofilm model and use it to assess the antimicrobial properties of a novel fluoride-releasing copolymer. Methods Stubs composed of a copolymer of methyl methacrylate (MMA) and 2-hydroxyethyl methacrylate (HEMA) with polymethyl methacrylate (PMMA) were produced by chemically-activated free radical polymerization. A fluoride-releasing copolymer was developed by incorporating sodium fluoride in place of a portion of the PMMA. Samples were mounted in polysulfone Modified Robbins Devices (MRDs) and were optimized for single- and mixed-species biofilm formation by Candida albicans, Lactobacillus casei and Streptococcus mutans. Results Fluoride release was sustained for at least 48 h in flowing conditions. Fluoride did not affect the colonization and biofilm growth of any of the microorganisms in monocultures. However, in mixed-species biofilms, cell densities of all three species were reduced approximately ten-fold (p < 0.05) on the fluoridated material compared with the non-fluoridated copolymer. Conclusions These data demonstrate that intermicrobial interactions in mixed-species acidogenic biofilms are sensitive to fluoride, and that the inclusion of fluoride in a denture lining copolymer reduces the formation of polymicrobial biofilms. Clinical significance The growth of acidogenic microorganisms on denture materials is associated with denture stomatitis and dental caries on surrounding teeth. A fluoride-releasing copolymer that inhibits acidogenic mixed-species biofilms, such as the material described in this study, has the potential to control these diseases by limiting biofilm growth.
  • Authors

    Published In

    Digital Object Identifier (doi)

    Author List

  • Yassin SA; German MJ; Rolland SL; Rickard AH; Jakubovics NS
  • Start Page

  • 62
  • End Page

  • 70
  • Volume

  • 48