Microbiology of Tooth Decay Quiz (Lec 22)
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Questions and Answers

What is the role of Streptococcus mutans in dental caries?

  • It has no impact on dental caries
  • It causes gingivitis
  • It plays an important role in dental caries (correct)
  • It prevents dental caries
  • What is the main role of fluoride in cavity prevention?

  • It causes dental caries
  • It helps in cavity prevention (correct)
  • It promotes dental plaque formation
  • It has no impact on cavity prevention
  • What is the primary reason for bacteria adhering to tooth surfaces?

  • Bacteria cannot adhere to tooth surfaces
  • Bacteria are attracted to tooth surfaces by fluoride
  • Bacteria interact with a layer of material on the tooth surface called the pellicle (correct)
  • Bacteria are repelled by tooth surfaces
  • What is the diversity of species in dental plaque?

    <p>It consists of a diverse range of species</p> Signup and view all the answers

    What is the usual state of the oral flora?

    <p>It is normally a balanced ecosystem</p> Signup and view all the answers

    How many cultivable species are known to be part of the oral flora?

    <p>350 species</p> Signup and view all the answers

    How many microbes per mL can saliva contain?

    <p>Up to 100 million microbes</p> Signup and view all the answers

    What is the consequence of a disturbance in the balanced oral flora?

    <p>Some resident microbes can behave as opportunistic pathogens</p> Signup and view all the answers

    What is the role of dextran and lactic acid in dental caries?

    <p>They contribute to the demineralization of tooth enamel</p> Signup and view all the answers

    What is the composition of dental calculus?

    <p>It primarily consists of mineralized bacterial plaque</p> Signup and view all the answers

    What is the primary function of biofilm in the context of dental health?

    <p>It allows bacteria to adhere to tooth surfaces</p> Signup and view all the answers

    What is the significance of gingivitis in the context of oral health?

    <p>It is an important condition to understand in the context of oral health</p> Signup and view all the answers

    What is the primary component of the pellicle?

    <p>Mucins</p> Signup and view all the answers

    What happens if plaque is allowed to build up?

    <p>Periodontal damage caused by abrasions in the gingival membrane</p> Signup and view all the answers

    What is the role of Streptococcus mutans in dental caries?

    <p>Adheres to tooth surfaces and plays an important role in dental caries</p> Signup and view all the answers

    What is the primary factor promoting tooth decay?

    <p>Diet rich in sugar</p> Signup and view all the answers

    What is the purpose of anti-calculus toothpastes containing pyrophosphate compounds?

    <p>To adsorb excess calcium, reducing intraplaque development</p> Signup and view all the answers

    What is the result of the transition from hunter-gatherer to farming diets?

    <p>Shifted the oral microbial community to a disease-associated configuration</p> Signup and view all the answers

    What does the enzyme glucosyltransferase (dextransucrase) produced by oral bacteria cause?

    <p>The assembly of glucose units from sucrose into glucans</p> Signup and view all the answers

    What is the primary component of dental plaque?

    <p>Complex microbial community found on the tooth surface</p> Signup and view all the answers

    What is the primary component of calculus?

    <p>An insoluble calcium phosphate crystal</p> Signup and view all the answers

    What allows bacterial products to be absorbed in calculus?

    <p>Calculus being porous</p> Signup and view all the answers

    What is the result of the decline in overall oral microbial diversity over the past few hundred years?

    <p>The human mouth has become a substantially less biodiverse ecosystem</p> Signup and view all the answers

    What is the effect of fluoride on tooth decay?

    <p>Mineralization of fluoride between spaces of enamel rods preventing acid from seeping in</p> Signup and view all the answers

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