Deck 3: Dental Biofilm: the Microbiology of the Periodontium in Health and Disease

Question 1

Which of the following is representative of phase III of biofilm formation?

A)Days 1-2
B)Days 2-4
C)Days 4-7
D)Days 5-8
E)Days 9-10

Answer 1

Days 4-7

Question 2

Oral biofilms are surrounded or encircled by a(an)

A)intermicrobial matrix.
B)microbial pellicle.
C)dental adhesion.
D)dental lectin.

Answer 2

intermicrobial matrix.

Question 3

Subgingival bacteria present in the biofilm get nutrients from

A)serous saliva.
B)crevicular fluid.
C)bacterial by-products.
D)calcified plaque.

Answer 3

crevicular fluid.

Question 4

Which of the following features is characteristic of unattached (free-floating)subgingival bacteria?

A)Loosely packed
B)Removed by flushing
C)Removed by scaling and root planing
D)Densely packed

Question 5

Which of the following statements is true about lipooligosaccharide?

A)Found in the cell wall of Actinomyces sp.
B)Initiates inflammation
C)Type of exotoxin
D)Derived from collagenase

Question 6

Which of the following statements defines a biofilm?

A)Calcified collection of bacteria that is difficult to remove
B)Loose collection of free-floating and attached bacteria
C)An acellular opaque film covering the tooth surfaces
D)Well-organized, cooperating community of bacteria

Question 7

It is difficult for locally applied antimicrobials to have an effect on oral biofilms because biofilms act as a protective barrier for the bacteria.

A)Both statement and reason are correct.
B)Both statement and reason are incorrect.
C)The statement is correct, but the reason is incorrect.
D)The statement is incorrect, but the reason is correct.

Question 8

Which of the following bacteria is a gram-negative obligate anaerobe?

A)Streptococcus sanguis
B)Porphyromonas gingivalis
C)Aggregator actinomycetemcomitans
D)Tannerella forythensis

Question 9

All of the following cells are present in dental plaque except one. Which one is the exception?

A)Red blood cells
B)Polymorphonuclear neutrophils
C)Epithelial cells
D)Fibroblasts

Question 10

Which of the following types of subgingival plaque is the most virulent?

A)Tooth associated
B)Tissue associated
C)Unattached
D)Attached

Question 11

Which of the following bacteria is a gram-negative facultative rod?

A)Streptococcus sanguis
B)Porphyromonas gingivalis
C)Aggregator actinomycetemcomitans
D)Tannerella forythensis

Question 12

Which of the following bacteria is primarily associated with the development of pregnancy gingivitis?

A)Peptostreptococcus micros
B)Treponema denticola
C)Aggregator actinomycetemcomitans
D)Prevotella intermedia
E)Fusobacterium nucleatum

Question 13

Which of the following bacteria have been documented to actually invade the epithelium and gingival connective tissue?

A)Porphyromonas gingivalis
B)Capnocytophaga sp.
C)Prevotella intermedia
D)Fusobacterium nucleatum
E)Peptostreptococcus micros

Question 14

All of the following are enzymes that break down periodontal tissues except one. Which one is the exception?

A)Proteases
B)Collagenase
C)Hyaluronidase
D)Elastase
E)Lipase

Question 15

Which of the following bacteria is strongly associated with puberty gingivitis?

A)Streptococcus sanguis
B)Prevotella intermedia
C)Aggregator actinomycetemcomitans
D)Tannerella forythensis

Question 16

Which of the following pathogens is strongly associated with periodontal disease?

A)Porphyromonas gingivalis
B)Treponema denticola
C)Prevotella intermedia
D)Capnocytophaga sp.
E)Peptostreptococcus micros

Question 17

Which of the following bacterial characteristics is associated with periodontal health?

A)Gram-positive, aerobic
B)Gram-positive, anaerobic
C)Gram-negative, aerobic
D)Gram-negative, anaerobic

Question 18

In health, the primary oral bacteria is

A)Streptococcus sanguis.
B)Prevotella intermedia.
C)Spirochetes.
D)Aggregator actinomycetemcomitans.
E)Tannerella forythensis.

Question 19

Which of the following bacteria is gram-negative?

A)Actinomyces viscosus
B)Eubacterium lentum
C)Tannerella forsythus
D)Peptostreptococcus micros
E)Corynebacterium matruchoti

Question 20

Which of the following bacteria is strongly associated with localized aggressive periodontitis?

A)Actinomyces viscosus
B)Eubacterium lentum
C)Tannerella forsythus
D)Aggregator actinomycetemcomitans

Question 21

Unattached gram-negative anaerobic microorganisms are in close proximity to the epithelium and appear to play an important role in the initiation and progression of ________.

Question 22

What is the correct health state for Assaccharolytic

A)Gingival health
B)Periodontal disease

Question 23

What is the correct health state for Motile bacteria

A)Gingival health
B)Periodontal disease

Question 24

Why is it necessary to explain to the periodontal patient about the importance of scaling and root planing before any antimicrobials are used?

Question 25

What is the correct health state for Obligate anaerobic bacteria

A)Gingival health
B)Periodontal disease

Question 26

________ degrades collagen fibers in the periodontal tissues.

Question 27

What is the correct health state for Saccharolytic

A)Gingival health
B)Periodontal disease

Question 28

Dental ________ are the primary risk factor for inflammatory periodontal lesions.

Question 29

________ are matrix-enclosed bacterial populations adherent to each other and/or to surfaces.

Question 30

What is the correct health state for Gram-negative bacteria

A)Gingival health
B)Periodontal disease

Question 31

What is the correct health state for Nonmotile bacteria

A)Gingival health
B)Periodontal disease

Question 32

How do you educate the periodontal patient about the role of risk factors in periodontal diseases and in the healing process?

Question 33

Aggregator actinomycetemcomitans is specifically associated with the development and progression of ________ periodontitis.