Ch 3; Microbiology Flashcards
What is the goal of endodontic treatment
To prevent the development of periapical periodontitis
or
to create adequate conditions for periradicular tissue healing.
Pulp protective layers are breached by
Caries Trauma induced fractures and cracks restorative procedures SRP attrition Abration Naturally absent Congenital anomalities: dens invaginatus/evaginatus.
What factors limit bacterial infection
outward movement of dentinal fluid/tubular contents dentinal sclerosis reparative dentin smear layer Host defense molecules
Primary endodontic infections are dominated by
obligate anaerobic bacteria
What are the 9 phyla of endodontic bacteria
Firmicutes Bacteroidetes Spirochaetes Fusobacteria Actinobacteria Proteobacteria Synergistetes TM7 SR1
What gram negative bacteria are associated with apical periodontitis
Dialister; invisus, pneumosintes Fusobacterium: nucleatum Porphyronomas: gingivitis, endodontalis Prevotella: intermedia, nigrescens, baronie, tannerae Tannerella: forsythia Treponema: denticola, socranskii
What gram positive bacteria are associated with apical periodontitis
Actinomyces: Isrealii Filifactor: alocis Olsenella: Uli Parvinomas: Micra Peptostreptococcus: anaerobious, stomatis Psedoramibacter: alactolyticus Streptococcus Propionibacterium: acnes
What Bacteria is most commonly found in post-instrument action and post-medications samples
Gram positive bacteria Streptococci Lactobacilli E. faecalis O. Uli M. micros P. alactolyticus Propionibacterim species
What is E.faecalis
Facultative anaerobic, Gram positive coccus
What species are most commonly found on persistent infections
E. faecalis
C. albicans
What bacteria is the main example of extraradicual infection independent of intraradicular infection and requires periapical surgery
Actinomyces species (apical actinomycosis) P. propionicum
