Biofilm Dental Mastery

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Essentials of the dental biofilm ecology

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Pablo Yansaguano

Ecuador

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Biofilm Dental Mastery


Biofilm Dental MasteryVersión en línea Essentials of the dental biofilm ecology por Pablo Yansaguano 1 What is the biofilm on teeth best described as? a A random, loose collection of bacteria b A structured, metabolically active microbial community c A sterile coating with no metabolism d A single-species plaque layer 2 What forms the initial soft layer adjacent to enamel before bacteria colonize? a The acquired enamel pellicle (protein/glucoprotein film) b A hard pellicle of enamel crystals c A bacterial biofilm d A calcium phosphate glaze 3 Which organisms are common early colonizers of the dental biofilm? a Pseudomonas and Escherichia coli b Corynebacterium only c Streptococcus and Actinomyces species d Veillonella and Lactobacillus only 4 How does adhesion start between bacteria and the pellicle? a Reversible forces like Van der Waals and hydrophobic interactions b Phagocytosis by host cells c Direct embedding into enamel d Irreversible covalent bonding only 5 What role do saliva components play in biofilm formation? a Adsorbed salivary components can act as receptors and aid adhesion b They instantly kill bacteria on contact c They inhibit all bacterial adhesion d They only clean the surface with no role in adhesion 6 What concept explains how biofilm bacteria coordinate behavior? a Direct neural signaling b Horizontal gene transfer only c Quorum sensing and signaling molecules d Antigenic drift 7 What happens during biofilm maturation in terms of metabolism? a It stops exchanging nutrients with the environment b It dissolves completely within hours c The mature biofilm is metabolically active and uses fermentable carbohydrates d It becomes dormant after initial colonization 8 What can low pH in the biofilm lead to? a Demineralization of tooth structure b Immediate enamel regeneration c Immediate tooth whitening d Remineralization only 9 Which factor promotes secondary colonization and greater diversity? a Colonization via coadhesion and interbacterial aggregation b Only the first colonizers determine all later species c Host immune clearance prevents it entirely d Secondary colonization is random 10 Why isn’t Streptococcus mutans the sole etiologic agent of caries, according to the sources? a Caries is caused only by viruses b Diet alone causes caries without bacteria c Streptococcus mutans is not present in plaque d Caries progression reflects ecological change in the microenvironment Explicación 1 Correct answer: a Community organized with metabolism and structure (not a random or sterile layer). 2 Correct: the acquired pellicle is the initial substrate for colonization. 3 Early colonizers often include Streptococcus and Actinomyces. 4 Initial contact is reversible via Van der Waals and hydrophobic forces. 5 Saliva provides receptors and can influence adhesion, modulating colonization. 6 Bacteria coordinate via quorum sensing signals when cell density increases. 7 Mature biofilms remain metabolically active, metabolizing carbohydrates. 8 Low pH promotes mineral loss (demineralization) in the tooth. 9 Secondary colonization expands the community via coadhesion and aggregation. 10 Caries is an ecological process; the environment selects organisms.

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Biofilm Dental Mastery

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Biofilm Dental MasteryVersión en línea

por Pablo Yansaguano

What is the biofilm on teeth best described as?

What forms the initial soft layer adjacent to enamel before bacteria colonize?

Which organisms are common early colonizers of the dental biofilm?

How does adhesion start between bacteria and the pellicle?

What role do saliva components play in biofilm formation?

What concept explains how biofilm bacteria coordinate behavior?

What happens during biofilm maturation in terms of metabolism?

What can low pH in the biofilm lead to?

Which factor promotes secondary colonization and greater diversity?

Why isn’t Streptococcus mutans the sole etiologic agent of caries, according to the sources?

Explicación