S.mutans Tolerance to Antimicrobials Quiz

Play an AI-generated podcast conversation about this lesson

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?

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

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

dltD (C) Signup and view all the answers

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

Hydroxyapatite (C) Signup and view all the answers

How does fluoride contribute to the prevention of caries?

By inhibiting bacterial population (B) Signup and view all the answers

What is the primary prevention aim concerning caries?

Impeding caries before it occurs (A) Signup and view all the answers

How does fluoride varnish contribute to caries prevention?

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

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

Strengthening tooth structure (C) Signup and view all the answers

What is the role of fluoride rinses in caries prevention?

Inhibiting bacterial activity directly (C) Signup and view all the answers

How does community water contribute to preventing decay?

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

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

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

How does PH buffering impact acid production by bacteria?

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

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

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

How does calcium pre-rinse impact salivary fluoride levels?

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

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

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

What effect does a less acidic environment have on demineralization?

A less acidic environment inhibits demineralization. (A) Signup and view all the answers