A reproducible oral microcosm biofilm model for testing dental materials

J. D. Rudney, R. Chen, P. Lenton, J. Li, Y. Li, R. S. Jones, C. Reilly, A. S. Fok, C. Aparicio

Research output: Contribution to journalArticlepeer-review

98 Scopus citations


Aims: Most studies of biofilm effects on dental materials use single-species biofilms, or consortia. Microcosm biofilms grown directly from saliva or plaque are much more diverse, but difficult to characterize. We used the Human Oral Microbial Identification Microarray (HOMIM) to validate a reproducible oral microcosm model. Methods and Results: Saliva and dental plaque were collected from adults and children. Hydroxyapatite and dental composite discs were inoculated with either saliva or plaque, and microcosm biofilms were grown in a CDC biofilm reactor. In later experiments, the reactor was pulsed with sucrose. DNA from inoculums and microcosms was analysed by HOMIM for 272 species. Microcosms included about 60% of species from the original inoculum. Biofilms grown on hydroxyapatite and composites were extremely similar. Sucrose pulsing decreased diversity and pH, but increased the abundance of Streptococcus and Veillonella. Biofilms from the same donor, grown at different times, clustered together. Conclusions: This model produced reproducible microcosm biofilms that were representative of the oral microbiota. Sucrose induced changes associated with dental caries. Significance and Impact of the Study: This is the first use of HOMIM to validate an oral microcosm model that can be used to study the effects of complex biofilms on dental materials.

Original languageEnglish (US)
Pages (from-to)1540-1553
Number of pages14
JournalJournal of Applied Microbiology
Issue number6
StatePublished - Dec 2012


  • Biofilm reactors
  • Composite resin restorations
  • Dental materials
  • Human oral microbial identification microarray
  • Oral microbiota
  • Oral microcosms


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