unit 111 Flashcards
pathogenic non motile gram negative rod shaped anaerobic involved with periondontal disease
porphyromonas gingivivalis
advantages of biofilm matrix
protects against antibacterials
bacteria develop tolerance to low concentrations of drugs within matix
ph wthin matrix makes drug less active
dental plaque contains
acid causing disintegration of tooth surface and leads to initiation of dental caries
salivary proteins and glicoprotiens
attach to enamel or exposed cementum/dentin
pellice
salivary deposit, permits plaque to form on surface of teeth
dental calculus
forms by mineralization of plaque bacteria into hydroxyapatite crystals depositing on tooth surfaces –> perio disease
four factors required for dental caries
susceptible host, microorganisms, substrate, time
bacteria involved in caries
streptococci mutans (s.sobrinus species), inital stage & lactobacillus species (progression of cavity)
dental plaque
produce acid and cause disintegration of TOOTH SURFACE
streptococcus mutans
produce acid as a result of metabolism with dietary sugars uasing demineralization of tooth structure and can survive at low ph
dimineralization
minerals of tooth structurses are disolved by organic acids, organic acids are produced by acidogenic bacteria mebatozing fermentable carbbohydrattes
reminerilization
saliva and fluoride provide protective factors
saliva
protective factors can balance or reverse tooth destruction
saliva buffers acids and supplies minerals.. igA in saliva is another protective factor
fluride
inhibts dimineralization
enhances remineralization
inhibits bacteria in biofilm
streptococcus mutans
acidogenc
aciduric
glycosyltranferases (split glucose)
gram positive facultaive anaerobe
