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22 Cards in this Set

  • Front
  • Back
What is Materia alba?
exfoliated epithelial cells and food debris on the superficial surface of dental plaque.
Quorum sensing in biofilms affects:
NUTRITION

METABOLISM

RESISTANCE TO ENVIRONMENTAL STRESSORS

BIOFILM MATURITY

DETACHMENT OF RESIDENTS

GENETIC REGULATION

COMPETENCY OF RESIDENTS TO ACQUIRE NEW GENES
carious lesions originate as a ______ _____ under an egg-shell thin layer of normal dental mineral
subsurface decalcification
When the outer covering of a carious lesion ruptures, what is created?
a cavitation
What are the three most common sites for caries to form?
1. occlusal fissures of molars and premolars and in dental pits

2. inter-proximally

3. facial surfaces at the cervical region
The main pathogens that cause dental caries are a family of streptococci called...
mutans streptococci
mutans streptococci interact with a secondary group of pathogens called _______
lactobacilli
In relation to the causative bacteria, how do carious lesions form?
MS proliferates in dental plaque and may induce a carious lesion with cavitation. The environmental pH of the cavitated site then decreases due to inadequate salivary buffer penetration, which stimulates LB (LB are acidophilic which means acid-loving.). LB will eventually dominate the microflora due to acidic conditions which inhibit other bacteria, and advance through enamel and dentin to the pulp.
______ is considered to be the initiating organism and _______ the secondary invader of dental caries.
mutans streptococci

lactobacilli
True/False?
No distinct pathogens have been identified in chronic gingivitis
True
What is necrotizing ulcerative gingivitis?
NUG is a painful gingivitis which affects mainly young adults and is believed to be associated with psychological stress.
The main bacterial pathogens that cause NUG are spirochetes which are members of what genus?
Genus Treponema
purulent accumulations (pus and necrosed epithelium) covering the affected tissue in NUG is referred to as a...
pseudo-membrane
Which opportunistic pathogen is associated with pregnancy gingivitis and puberty gingivitis?
Prevotella intermedia
Periodontitis is episodic, meaning what?
it goes through periods of active breakdown and no breakdown
What is Aggressive periodontitis?
AP’s are periodontal diseases which occur in young individuals (younger than 30 years), show rapid attachment loss, some familial (ie. hereditary) associations, a disease severity which is inconsistent with microbial deposits and association with the pathogen, Aggregatibacter actinomycetemcomitans
Aggregatibacter actinomycetemcomitans is associated with what type of periodontitis?
Aggressive periodontitis
In what type of gingivitis does a characteristic "band-like” marginal gingivitis appear on buccal surfaces along with diffuse redness extending into the vestibule?
HIV gingivitis
reversible pulpitis is resolved by what?
excavation and restoration of the tooth
treatment for irreversible pulpitis ordinarily requires...
root canal therapy
Three bacterial species associated with endodontic infections are...
1. Porphyromonas endodontalis

2. Prevotella intermedia

3. Porphyromonas gingivalis
. Infections associated with failed endontically treated teeth usually are dominated by Gram positive facultative anaerobes, and almost always include...
Enterococcus faecalis

A species normally found in the human gut.