title: [Oral streptococci affecting Ca-phosphate precipitation].
abstract: The precipitation of Ca-compounds in ageing dental plaque leads to the formation of calculus. Bacterial lipoteichoic acid (LTA) has been discussed as Ca-carrier in this process (Zoon et al., 1989). Therefore in this study, LTA was isolated from oral streptococci and tested for its influence on the precipitation of Ca-phosphate. LTA-containing bacteria, LTA-free bacteria and isolated LTA were added to the reaction mixtures for Ca-phosphate precipitation and the amount of precipitated mineral was measured. LTA-containing cells and, above all, LTA, inhibited Ca-phosphate precipitation in a distinct pH-range just above the acid solubility of the mineral by complexing Ca(2+)-ions. Experiments with Ca-fluoride in place of Ca-phosphate showed that LTA did not affect the precipitation of this mineral.
authors.affiliation: Klinik und Poliklinik für Zahn-, Mund- und Kieferkrankheiten der Universität Hamburg.
authors.forename: J E
authors.initials: JE
authors.lastname: Bergmann
authors.forename: H J
authors.initials: HJ
authors.lastname: Gülzow
authors.forename: T
authors.initials: T
authors.lastname: Lewandowski
mesh_terms: D002124:Calcium Fluoride / Q000378:metabolism; D002130:Calcium Phosphates / Q000378:metabolism*; D003728:Dental Calculus / Q000378:metabolism / Q000382:microbiology*; D003747:Dental Enamel Solubility; D003773:Dental Plaque / Q000382:microbiology; D006863:Hydrogen-Ion Concentration; D008070:Lipopolysaccharides / Q000378:metabolism*; D013295:Streptococcus mutans / Q000502:physiology*; D013682:Teichoic Acids / Q000378:metabolism*
chemical_list: D002130:Calcium Phosphates; D008070:Lipopolysaccharides; D013682:Teichoic Acids; C485828:alpha-tricalcium phosphate; C485830:tetracalcium phosphate; C009900:lipoteichoic acid; C485838:calcium phosphate, monobasic, anhydrous; C020243:calcium phosphate; C485829:calcium phosphate, dibasic, anhydrous; D002124:Calcium Fluoride
vernacular_title: Oral Streptokokken beeinflussen die Fällung von Ca-Phosphat.