Deck 16: Biofilms

Question 1

Acids that can demineralize the surface of enamel are produced by

A) calculus.
B) bacteria.
C) pellicle.
D) salivary corpuscles.

Answer 1

B

Question 2

Which surface of a molar is an ideal site for the colonization of oral organisms?

A) Mesial surface
B) Distal surface
C) Buccal surface
D) Occlusal surface

Answer 2

D

Question 3

The breakdown of ______________ results in a brown spot on the tooth.

A) organic debris
B) enamel crystals
C) salivary corpuscles
D) filamentous organisms

Answer 3

B

Question 4

Which type of organism appears supragingivally?

A) Neutral
B) Anaerobic
C) Gram-positive
D) Gram-negative

Question 5

Which of the following is a function of a disclosing solution?

A) Diagnosing pulpits
B) Locating calculus deposits
C) Determining whether plaque is still present
D) Showing cracks or fissures in the enamel surface

Question 6

Which of the following allows plaque to form on the surface of a tooth?

A) Pellicle
B) Serumal calculus
C) Hydroxyapatite
D) Primary cuticle

Question 7

The primary component of calculus is __________.

A) serum
B) bacteria
C) calcium
D) hydroxyapatite

Question 8

Which of the following is the best definition for plaque?

A) A type of gingival inflammation.
B) A stone-like concretion formed on the teeth.
C) A bacterial biofilm on the surface of the teeth.
D) An acellular thin film deposited on the surface of teeth from salivary proteins.

Question 9

Which organisms attach to the pellicle to form a thick layer of plaque?

A) Rods
B) Filamentous organisms
C) Desquamated epithelial cells
D) All of the above

Question 10

Which disclosing solution will not permanently discolor composite restorations?

A) 0.2% basic fuchsin
B) Erythrosine red No.3
C) Methylene blue
D) Toluidine blue

Question 11

It takes almost 10 days for the pellicle to develop into a thick plaque.The composition of the plaque varies,depending on the location of the plaque and the extent of gingival disease.

A) Both statements are true.
B) Both statements are false.
C) The first statement is true;the second is false.
D) The first statement is false;the second is true.

Question 12

Calculus most often appears near which of the following?

A) A missing tooth
B) A tight labial frenum
C) The incisal edge of a tooth
D) The opening of a salivary duct

Question 13

Which of the following forms the primary cuticle?

A) Fibroblasts
B) Ameloblasts
C) Odontoblasts
D) Cementocytes

Question 14

Subgingival calculus is ________ than supragingival calculus.

A) softer
B) harder
C) thicker
D) lighter

Question 15

The dark color of supragingival calculus is attributed to which of the following?

A) Calcium
B) Hydroxyapatite
C) Organic skeletons
D) Serum and blood pigments

Question 16

The ______________ of plaque is essential for the prevention of disease.

A) removal
B) disclosure
C) deposition
D) mineralization

Question 17

Plaque is more mineralized than calculus.

Question 18

High levels of ______________ in the saliva indicate the presence of gingival inflammation.

A) T cells
B) leukocytes
C) lymphocytes
D) macrophages

Question 19

Which type of organism appears subgingivally?

A) Neutral
B) Aerobic
C) Gram-positive
D) Gram-negative

Question 20

Dental plaque is characterized as (a/an)

A) accretion.
B) cuticle.
C) biofilm.
D) cuticular protein.

Question 21

Calculus may form on dental prostheses.

Question 22

Within days,a pellicle can grow into a thick plaque,containing motile spirochetes.

Question 23

The composition of the dental plaque depends,in part,on the extent of gingival disease.

Question 24

Glycoproteins are found in the saliva.

Question 25

Serumal calculus is usually a darker color.

Question 26

In tonsillitis,there is a dramatic increase in salivary leukocytes.

Question 27

Gingival inflammation has an effect on the cervical enamel.

Question 28

Cuticular protein is the most important function of the primary cuticle.

Question 29

Plaque protects the enamel surface but can also serve as an attachment site for bacteria.

Question 30

Bacterial ghosts are calcified bacteria.

Question 31

Salivary mucin contributes to the formation of plaque biofilm.

Question 32

Calculus varies in both composition and hardness.