title: Ca, Pi, and F in the fluid of biofilm formed under sucrose.
abstract: Calcium (Ca), inorganic phosphorus (P(i)), and fluoride (F) concentrations are low in the whole plaque biofilm formed under exposure to sucrose. It was hypothesized that this would be reflected in the biofilm fluid, where these low values should greatly influence the de/remineralization process. Dental biofilms were formed in situ over enamel blocks mounted in palatal appliances and exposed 8 times/day to distilled water, glucose+fructose, or sucrose solutions for 14 days. While Ca, P(i), and F concentrations in the whole biofilms were significantly lower in the glucose+fructose and sucrose groups, no effect on biofilm fluid was observed, even after a cariogenic challenge. An increase in whole biofilm mineral ions was observed 24 hrs after the carbohydrate treatments were suspended, but this effect was also not observed in the fluid. These results suggest that there is a homeostatic mechanism that maintains biofilm fluid mineral ion concentration, regardless of its total concentration in the whole biofilm.
authors.affiliation: Faculty of Dentistry of Piracicaba, UNICAMP, Av. Limeira 901, 13414-903, Piracicaba, SP, Brazil.
authors.forename: L M A
authors.initials: LM
authors.lastname: Tenuta
authors.forename: A A
authors.initials: AA
authors.lastname: Del Bel Cury
authors.forename: M C
authors.initials: MC
authors.lastname: Bortolin
authors.forename: G L
authors.initials: GL
authors.lastname: Vogel
authors.forename: J A
authors.initials: JA
authors.lastname: Cury
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D018441:Biofilms; D002118:Calcium / Q000032:analysis; D002326:Cariogenic Agents / Q000009:adverse effects*; D002327:Cariostatic Agents / Q000627:therapeutic use; D018592:Cross-Over Studies; D003773:Dental Plaque / Q000737:chemistry* / Q000378:metabolism; D004311:Double-Blind Method; D005122:Exudates and Transudates / Q000737:chemistry; D005459:Fluorides / Q000032:analysis; D005632:Fructose / Q000009:adverse effects; D005947:Glucose / Q000009:adverse effects; D006706:Homeostasis; D006801:Humans; D006863:Hydrogen-Ion Concentration; D017736:Ion-Selective Electrodes; D010758:Phosphorus / Q000032:analysis; D012969:Sodium Fluoride / Q000627:therapeutic use; D018709:Statistics, Nonparametric; D013395:Sucrose / Q000009:adverse effects; D017001:Tooth Demineralization / Q000139:chemically induced / Q000378:metabolism*; D014089:Tooth Remineralization
chemical_list: D002326:Cariogenic Agents; D002327:Cariostatic Agents; D010758:Phosphorus; D005632:Fructose; D013395:Sucrose; D012969:Sodium Fluoride; D005947:Glucose; D005459:Fluorides; D002118:Calcium