34 Questions
What is the term for the replacement of some microorganisms by others in response to changes affecting the characteristics of where they live?
Allogenic succession
During which stage does the acquisition of microorganisms from the mother's vaginal tract occur?
Before birth (in utero)
At which stage do the microorganisms in the oral microbiota change during the lifetime?
After the permanent dentition
What is the term for the replacement in the microbiota by changes in the habitat due to microbial factors?
Autogenic succession
Which of the following best describes an ecosystem?
An interaction of living organisms and non-living components where energy is exchanged
In the oral cavity, which is considered an ecological niche?
Buccal mucosa
What regulates ecosystems in the oral cavity?
Eruption or extraction of teeth
How would you describe the variability in the oral cavity ecosystem?
Qualitative and quantitative differences among different individuals
What best characterizes the oral cavity ecosystem?
Open and dynamic
Which factor contributes to the qualitative and quantitative characteristics of the entire microbiota in the oral cavity?
Presence of orthodontic appliances
Which of the following is a source of nutrients for oral bacteria?
Saliva
What is the role of lipoteichoic acid binding in oral microorganism growth?
It allows adherence to hard surfaces
What is the main function of saliva in relation to oral microorganisms?
pH buffer
Which of the following is a function of host protective factors in limiting the buildup of microorganisms?
Mucose integrity
What is the effect of chewing and swallowing on oral microorganisms?
Mechanical drag of microorganisms in the digestive tract
Which component of gingival fluid is released by desquamation of mucosal surfaces, providing nutrients for oral bacteria?
Glycoproteins and lipoproteins
What is the primary role of conjunctival and epithelial cells in relation to oral microorganisms?
Provide nutrients for bacteria
What is the primary role of interbacterial sources in supporting the growth of oral microorganisms?
Produces short chain fatty acids used by treponemes
How do exogenous sources (diet) primarily contribute to the growth of oral microorganisms?
Aid digestion through bacterial enzymes
What is the function of antagonistic factors between bacteria in limiting the growth of certain microorganisms or pathogens?
Competition for nutrients
What is the main benefit of the oral microbiota?
Avoid unusual growth of microorganisms or pathogens
What is the role of Gram-negative bacilli in the composition of oral microbiota?
Aid digestion through bacterial enzymes
What is the main function of the acellular amorphous layer formed by selective adsorption of salivary components on tooth surfaces?
Preventing the penetration of acids and the removal of minerals from the tooth enamel surface into the medium
What is the virtual space formed by the inner part of the marginal gingiva and the tooth surface called?
Gingival sulcus
What is the main function of saliva in the oral cavity?
Softening and lubricating food for easier swallowing
At what pH do sugar-rich foods typically result in?
Low pH
What allows colonization of bacteria that are not capable of adhesion?
Co-aggregation
What is a protective characteristic of the acquired salivary pellicle?
Opposing tooth decalcification
Which factor affects the oral environment by creating a reducing atmosphere allowing anaerobes to develop?
Oxygen-consuming bacteria
What is a specific feature of Streptococcus mutans in relation to adherence to hard surfaces?
Glucans mediated binding
What factor varies greatly depending on sugar-rich or protein-rich foods?
pH
What is the main effect of saliva in relation to food in the oral cavity ?
Lubricates food for easier swallowing
What is one physiological change experienced by an individual at puberty that can affect the oral environment?
Hormonal changes
What is a specific feature of saliva that affects the oral environment?
Bicarbonate buffer
Test your knowledge on factors affecting the growth of oral microorganisms, including the synthesis of glucans by GTF, the network generation by glucans and surface proteins, and the factors influencing adhesion and retention.
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