Biofilm Flashcards
interactions involved in the formation of biofilm 1-5
formation of a pellicle bacterial multiplication and colonization biofilm growth and maturation matrix formation bacteria attach to the pellicle
t/f: dental caries and gingival and periodontal infections are not caused by microorganisms in microbial or dental biofilms
false
are caused by microorganisms found in microbial or dental biofilm
t/f:
cleansing of debris from about fixed prostheses and orthodontic appliances is an important part of oral sanitation
true
t/f:
the hard deposits are acquired pellicle or cuticle, dental biofilm, materia alba, and food debris
false
soft deposits are…
t/f:
the soft deposits on teeth are dental calculus
false
the hard deposits on…
t/f:
the incipient carious lesion begins as visible demineralization
false
begins as subsurface demineralization
t/f:
aquired pellicle is composed primarily of glycoprotiens from the saliva, which are selectively absorbed by the hydroxyapatite of the tooth surface
true
t/f:
the unstained pellicle is readily visible.
false
pellicle is clear, translucent, insoluble, and not readily visible until disclosing agent has been applied
t/f:
the probability of the development of dental caries and/or gingivitis increases as the number of microorganisms decrease
false
number of microorganisms increase
t/f:
gingivitis is clinically evident within 2 to 3 days when biofilm is left undisturbed on the tooth surface
false
evident within 2 to 3 weeks
t/f:
subgingival biofilm results from the apical proliferation of microorganisms from supragingival biofilm
true
t/f:
the flora of the subgingival biofilm does not differ from that of the supragingival biofilm
false
subgingival bifilm does differ
t/f:
the biofilm attached to the tooth surface is associated with calculus formation, root caries, and root resorption
true
t/f:
between the layers of attached biofilm are many motile, gram-negative organisms. these are considered part of the attached biofilm
false
considered part of free floating/unattached
t/f:
loosely attached to the pocket epithelium are many gram-negative microorganisms and numerous white blood cells. these make up the epithelium-associated biofilm
true
t/f:
microbial biofilm plays a major role in the initiation and progression of both dental caries and periodontal diseases
true
t/f:
surface pellicle is continuous with subsurface pellicle, which is embedded in the tooth structure, particularly where the tooth surface is partially demineralized
true
when stained with a disclosing agent, unstained pellicle appears thin, with a pale staining that contrasts with the thicker, darker staining of dental biofilm
true
t/f:
the concentration of fluoride in biofilm is higher when fluoridated water is used, and it increases after professional topical applications of fluoride and the use of fluoride-containing dentifrices and mouthrinses
true
t/f:
carbohydrates contribute to the adherence of microorganisms to each other and the teeth
true
t/f:
the acquired pellicle begins to form within hours after all external material has been removed from the tooth surfaces with an abrasive
false
form within minutes
t/f:
subgingival biofilm contains proteins from gingival sulcus fluid
true
t/f:
general oral cleanliness is not influenced by the removal of dental biofilm deposits
false
cleanliness is influenced by
t/f:
dental caries is a disease of the dental calcified structures (enamel, dentiin, and cementum) that is characterized by demineralization of the mineral components and dissolution of the organic matrix
true
t/f:
the number of microorganisms is higher in subgingival biofilm than in supragingival biofilm
true
size and shape are affected by friction of tongue, cheeks, and lips
supra
main source of nutrients for bacterial proliferation is gingival sulcus fluid
sub
coronal to the margin of the free gingiva
supra
may become thicker as the diseased pocket wall becomes less tight
sub
early biofilm; primarily gram positive cocci
supra
heaviest collection on areas not cleaned daily by the patient
supra
found on the cervical third, especially facial surfaces, the lingual mandibular molars, and proximal surfaces
supra
down growth of bacteria from supragingival biofilm
sub
diseased pocket; primarily gram-negative, motile, spirochetes, rods
sub
sources of nutrients for bacterial proliferation are saliva and ingested food
supra
made up of three layers
sub
the structure is an adherent, densely packed microbial layer over pellicle on the tooth surface
supra
sequence of events for demineralization and dental caries
biofilm in oral cavity
cariogenic food stuff eaten
fermentable carbohydrate taken into biofilm
acid forms immediately
pH of bioflim drops
frequent exposure of tooth surface to acid
demineralization occurs
white spot lesions; incipient lesions formed
dental caries occurs
