T4 Ch 7 & 8

Question 1

Dental caries is caused by an infection with:

a. Fusobacterium
b. Streptococcus mutans
c. Eikenella corrodens
d. Porphyromonas gingivalis

Answer 1

b. Streptococcus mutans

Question 2

Which of the following choices is the dental health care team’s biggest problem in the adult patient?

a. Localized dental infection
b. Periodontal disease
c. Caries
d. Systemic dental infection

Answer 2

b. Periodontal disease

Question 3

If an infection is just beginning, the organisms most likely to be present are:

a. Gram-negative anaerobes
b. Gram-negative cocci
c. Gram-positive anaerobes
d. Gram-positive cocci

Answer 3

d. Gram-positive cocci

Question 4

Which of the following agents is the drug of choice for an early dental infection unless the patient is allergic to it?

a. Metronidazole
b. Penicillin
c. Clindamycin
d. Erythromycin

Answer 4

b. Penicillin

Question 5

Superinfection is more often caused by __________-spectrum antibiotics and increases when taken for a __________ time period.

a. Narrow; shorter
b. Narrow; longer
c. Broad; shorter
d. Broad; longer

Answer 5

d. Broad; longer

Question 6

Which of the following statements is true concerning a culture and sensitivity test?

a. Antibiotic therapy should not be initiated until the results of the test are available.
b. One to two weeks are required before the results of this test are available.
c. An antibiotic disk with no zone around it shows sensitivity.
d. An antibiotic disk with a zone around it shows sensitivity.

Answer 6

d. An antibiotic disk with a zone around it shows sensitivity.

Question 7

Antiinfective agents can potentiate the effect of oral anticoagulants by interfering with the production of vitamin:

a. A
b. K
c. D
d. E

Answer 7

b. K

Question 8

Which drug should be used before oral prophylaxis for a patient who has artificial heart valves with no known drug allergies?

a. Clindamycin
b. Amoxicillin
c. Tetracycline
d. Erythromycin

Answer 8

b. Amoxicillin

Question 9

Tetracyclines should not be used in children younger than __________ years of age.

a. 6
b. 15
c. 12
d. 9

Answer 9

d. 9

Question 10

Administration of metronidazole for dental infections during pregnancy is:

a. Permitted without restriction
b. Permitted during the last half of pregnancy
c. Permitted only during the second trimester
d. Contraindicated

Answer 10

d. Contraindicated

Question 11

Which of the following combinations of three drugs are administered concurrently in all active cases of tuberculosis (TB)?

a. Rifampin, PZA, and streptomycin
b. Ethambutol, isoniazid (INH), and Rifater
c. Pyrazinamide (PZA), rifapentine, and Rifater
d. Isoniazid (INH), rifampin, and pyrazinamide

Answer 11

d. Isoniazid (INH), rifampin, and pyrazinamide

Question 12

Nystatin is used for both the treatment and the prevention of __________ in susceptible cases.

a. Blastomycosis
b. Oral candidiasis
c. Tinea
d. Histoplasmosis

Answer 12

b. Oral candidiasis

Question 13

Ketoconazole:

a. Is excreted primarily by the kidneys
b. Will not cross the placenta nor be excreted in breast milk
c. Is the drug of choice for treatment of tinea
d. Requires an acidic environment for adequate systemic absorption

Answer 13

d. Requires an acidic environment for adequate systemic absorption

Question 14

Thrush is:

a. Oropharyngeal candidiasis
b. An allergic reaction
c. An idiosyncrasy
d. A serious systemic fungal infection

Answer 14

a. Oropharyngeal candidiasis

Question 15

What are chemical substances made by microorganisms that have the capacity to destroy or suppress the growth or multiplication of organisms or prevent their action.

a. antimicrobial agents
b. antibacterial agents
c. antibiotic agents
d. antiinfective agents

Answer 15

c. antibiotic agents

Question 16

Which antimicrobial agent irreversibly kills bacteria?

a. Clindamycin
b. bacteriostatic
c. Nystatin
d. bactericidal

Answer 16

d. bactericidal

Question 17

What is the best defense against a pathogen?

a. scaling and root planing
b. synergism
c. host response
d. antibiotic prescription

Answer 17

c. host response

Question 18

Of the four major groups of penicillin, which are the most popular in dentistry?

a. ampicillins & extended-spectrum penicillins
b. Pen G/Pen V & penicillinase resistant penicillins
c. penicillinase-resistant penicillin & extended -spectrum penicillin
d. PenG/PenV & ampicillins

Answer 18

d. PenG/PenV & ampicillins

Question 19

Which of the following is stored in the gingival crevicular fluid, thus making it effective in fighting some periodontal conditions?

a. tetracycline
b. none of the answers
c. azithromycin
d. clindamycin

Answer 19

a. tetracycline

Question 20

What adverse reaction can occur from using broad-spectrum antiinfective agents over a long period of time?

a. dependency
b. superinfection
c. gastrointestinal upset
d. allergic reaction

Answer 20

b. superinfection

Question 21

Opportunistic infections

a. infect non-immunocompromised patients
b. live with their host’s cells to survive
c. often occur in patients with AIDS
d. are retroviruses

Answer 21

c. often occur in patients with AIDS

Question 22

Amoxicillin is most often used to treat infection because it
a. produces higher blood levels 
b. absorption is not impaired by food 
c. requires less frequent dosing 
d. is better absorbed 
e all the answers are correct

Answer 22

e all the answers are correct

Question 23

What is contained within the microspheres of Arrestin that kills bacteria?

a. minocycline hydrochloride
b. clindamycin
c. penicillin
d. tetracycline

Answer 23

a. minocycline hydrochloride

Question 24

Which drug is a true antibiotic originally found in a sewer in Italy?

a. Penicillin G
b. Clindamycin
c. Cephalosporins
d. Vancomycin

Answer 24

c. Cephalosporins

Question 25

Which antibiotic is the “expensive cousin” to the penicillins?

a. cephalosporins
b. metronidazole
c. clindamycin
d. warfarin

Answer 25

a. cephalosporins

Question 26

Viruses are difficult to treat because they cooperate with the host’s cells.

a. The first part of the statement is false, the second part is true.
b. The first part of the statement is true, the second part is false.
c. Both parts of the statement are true.
d. Both parts of the statement are false.

Answer 26

c. Both parts of the statement are true.