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22 Cards in this Set
- Front
- Back
What is Materia alba?
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exfoliated epithelial cells and food debris on the superficial surface of dental plaque.
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Quorum sensing in biofilms affects:
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NUTRITION
METABOLISM RESISTANCE TO ENVIRONMENTAL STRESSORS BIOFILM MATURITY DETACHMENT OF RESIDENTS GENETIC REGULATION COMPETENCY OF RESIDENTS TO ACQUIRE NEW GENES |
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carious lesions originate as a ______ _____ under an egg-shell thin layer of normal dental mineral
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subsurface decalcification
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When the outer covering of a carious lesion ruptures, what is created?
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a cavitation
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What are the three most common sites for caries to form?
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1. occlusal fissures of molars and premolars and in dental pits
2. inter-proximally 3. facial surfaces at the cervical region |
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The main pathogens that cause dental caries are a family of streptococci called...
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mutans streptococci
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mutans streptococci interact with a secondary group of pathogens called _______
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lactobacilli
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In relation to the causative bacteria, how do carious lesions form?
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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.
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______ is considered to be the initiating organism and _______ the secondary invader of dental caries.
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mutans streptococci
lactobacilli |
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True/False?
No distinct pathogens have been identified in chronic gingivitis |
True
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What is necrotizing ulcerative gingivitis?
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NUG is a painful gingivitis which affects mainly young adults and is believed to be associated with psychological stress.
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The main bacterial pathogens that cause NUG are spirochetes which are members of what genus?
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Genus Treponema
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purulent accumulations (pus and necrosed epithelium) covering the affected tissue in NUG is referred to as a...
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pseudo-membrane
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Which opportunistic pathogen is associated with pregnancy gingivitis and puberty gingivitis?
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Prevotella intermedia
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Periodontitis is episodic, meaning what?
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it goes through periods of active breakdown and no breakdown
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What is Aggressive periodontitis?
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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
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Aggregatibacter actinomycetemcomitans is associated with what type of periodontitis?
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Aggressive periodontitis
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In what type of gingivitis does a characteristic "band-like” marginal gingivitis appear on buccal surfaces along with diffuse redness extending into the vestibule?
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HIV gingivitis
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reversible pulpitis is resolved by what?
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excavation and restoration of the tooth
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treatment for irreversible pulpitis ordinarily requires...
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root canal therapy
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Three bacterial species associated with endodontic infections are...
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1. Porphyromonas endodontalis
2. Prevotella intermedia 3. Porphyromonas gingivalis |
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. Infections associated with failed endontically treated teeth usually are dominated by Gram positive facultative anaerobes, and almost always include...
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Enterococcus faecalis
A species normally found in the human gut. |