1.An in vitro model of Fusobacterium nucleatum and Porphyromonas gingivalis in single- and dual-species biofilms
Lívia Jacovassi TAVARES ; Marlise Inêz KLEIN ; Beatriz Helena Dias PANARIELLO ; Erica DORIGATTI DE AVILA ; Ana Cláudia PAVARINA
Journal of Periodontal & Implant Science 2018;48(1):12-21
PURPOSE: The goal of this study was to develop and validate a standardized in vitro pathogenic biofilm attached onto saliva-coated surfaces. METHODS: Fusobacterium nucleatum (F. nucleatum) and Porphyromonas gingivalis (P. gingivalis) strains were grown under anaerobic conditions as single species and in dual-species cultures. Initially, the bacterial biomass was evaluated at 24 and 48 hours to determine the optimal timing for the adhesion phase onto saliva-coated polystyrene surfaces. Thereafter, biofilm development was assessed over time by crystal violet staining and scanning electron microscopy. RESULTS: The data showed no significant difference in the overall biomass after 48 hours for P. gingivalis in single- and dual-species conditions. After adhesion, P. gingivalis in single- and dual-species biofilms accumulated a substantially higher biomass after 7 days of incubation than after 3 days, but no significant difference was found between 5 and 7 days. Although the biomass of the F. nucleatum biofilm was higher at 3 days, no difference was found at 3, 5, or 7 days of incubation. CONCLUSIONS: Polystyrene substrates from well plates work as a standard surface and provide reproducible results for in vitro biofilm models. Our biofilm model could serve as a reference point for studies investigating biofilms on different surfaces.
Bacterial Adhesion
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Biofilms
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Biomass
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Fusobacterium nucleatum
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Fusobacterium
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Gentian Violet
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In Vitro Techniques
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Microscopy, Electron, Scanning
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Polystyrenes
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Porphyromonas gingivalis
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Porphyromonas