S.mutans Tolerance to Antimicrobials Quiz

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Questions and Answers

What is the main finding regarding S.mutans' susceptibility to dental-relevant antimicrobials according to the text?

  • Increased resistance to triclosan and sodium fluoride (correct)
  • Increased sensitivity to daptomycin and clindamycin
  • Increased tolerance to chlorhexidine (CHX)
  • Reduced susceptibility to triclosan and sodium fluoride

What is a key outcome of the study regarding long-term exposure to CHX on Streptococcus mutans?

  • Persistence of CHX-induced variants in the oral cavity
  • Increased competitiveness against commensal oral streptococci
  • Upregulation of dltC and dltD genes in CHX-resistant strains (correct)
  • Decreased hydrophobicity in SM-Cs compared to parental strains

How does continuous exposure to CHX affect resistance development in Streptococcus mutans?

  • It decreases hydrophobicity in the bacterial strains
  • It results in an increase in MIC after 10 passages (correct)
  • It leads to a reduction in minimum inhibitory concentration (MIC)
  • It induces CHX sensitivity in the parental strains

What is the fitness cost associated with increased tolerance to CHX in Streptococcus mutans?

<p>Persistence of induced variants in the oral cavity (A)</p> Signup and view all the answers

Which gene was found to be upregulated in a CHX-resistant strain of Streptococcus mutans?

<p>dltD (C)</p> Signup and view all the answers

What is the main component of enamel that is highlighted for its role in appearance and reflectivity?

<p>Hydroxyapatite (C)</p> Signup and view all the answers

How does fluoride contribute to the prevention of caries?

<p>By inhibiting bacterial population (B)</p> Signup and view all the answers

What is the primary prevention aim concerning caries?

<p>Impeding caries before it occurs (A)</p> Signup and view all the answers

How does fluoride varnish contribute to caries prevention?

<p>By providing a protective layer on enamel (C)</p> Signup and view all the answers

Which process does fluoride help in by forming Ca5(PO4)3F?

<p>Strengthening tooth structure (C)</p> Signup and view all the answers

What is the role of fluoride rinses in caries prevention?

<p>Inhibiting bacterial activity directly (C)</p> Signup and view all the answers

How does community water contribute to preventing decay?

<p>By systematically delivering fluoride for public dental health benefits (B)</p> Signup and view all the answers

What is the relationship between drinking water and resistance to decay?

<p>Drinking water leads to increased resistance to decay. (A)</p> Signup and view all the answers

How does PH buffering impact acid production by bacteria?

<p>PH buffering inhibits acid production by bacteria. (C)</p> Signup and view all the answers

What is the role of fluoride releasing varnish in caries prevention?

<p>Fluoride releasing varnish is recommended for caries prevention, especially in high-risk populations. (D)</p> Signup and view all the answers

How does calcium pre-rinse impact salivary fluoride levels?

<p>Calcium pre-rinse increases salivary fluoride levels. (C)</p> Signup and view all the answers

What is the impact of fluoride intake on resistance to decay?

<p>Fluoride intake strengthens resistance to decay. (B)</p> Signup and view all the answers

What effect does a less acidic environment have on demineralization?

<p>A less acidic environment inhibits demineralization. (A)</p> Signup and view all the answers

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