Deck 39: Local Anesthesia

Question 1

Which of the following anesthetic agents is preferred for a dental hygiene procedure expected to last 1.5 hours?

A) 2% Mepivacaine
B) Etidocaine 1.5%,epinephrine 1:200,000
C) Procaine 2%,propoxycaine 0.4%,levonordefrin 1:20,000
D) 2% Lidocaine,epinephrine 1:100,000

Answer 1

2% Lidocaine,epinephrine 1:100,000

Question 2

An example of an absolute contraindication to vasoconstrictors is which of the following?

A) Pregnancy
B) Sulfite allergy
C) Heart palpitations
D) Hypertension

Answer 2

Sulfite allergy

Question 3

On examination of a local anesthetic cartridge,you notice that the rubber stopper is extruded.What is the most likely cause of this irregularity?

A) Diffusion of an unknown liquid has occurred.
B) The cartridge was stored above the recommended temperature.
C) The contents of the cartridge have expired.
D) Both A and B are likely causes.

Answer 3

Diffusion of an unknown liquid has occurred.

Question 4

Which of the following is (are)true about topical anesthetics?

A) Topical anesthetics are most effective when placed on dry tissue for 1 to 2 minutes.
B) When applied properly,topical anesthetics can penetrate 2 mm into the tissue.
C) Topical anesthetics have very limited effect on keratinized tissue,such as the palate.
D) All of the above are true.
E) Both A and C are true.

Question 5

Which division of the trigeminal nerve gives off the infraorbital nerve?

A) Mandibular division
B) Ophthalmic division
C) Maxillary division

Question 6

Which portion(s)of the anesthetic molecule is necessary for the agent to travel to the site of action?

A) Aromatic ring
B) Intermediate chain
C) Amino group
D) All of the above
E) A and C

Question 7

When the armamentarium is prepared for a maxillary infiltration of tooth 8,the needle bevel should be oriented in which direction?

A) Toward the syringe window
B) It doesn't matter which direction the bevel is oriented for this injection
C) Opposite of the syringe window

Question 8

Which of the following injections is the best choice to deliver anesthesia to the MB root of the first molar?

A) MSA
B) ASA
C) PSA
D) Maxillary infiltration

Question 9

A needle of which of the following gauges would be most likely to deflect easily when traveling through tissue?

A) 25 gauge
B) 27 gauge
C) 30 gauge

Question 10

From the following list,which statement would be a good choice when communicating with a client during anesthetic delivery?

A) "You're doing great.We're almost finished."
B) "This will only hurt a little."
C) "Take a nice deep breath.We are going to begin."
D) A and C
E) All of the above

Question 11

Calculate the maximum dose of 2% lidocaine for a patient weighing 180 lb.Given: 6.5 cartridges.

A) Seven cartridges
B) Six cartridges
C) Eight cartridges

Question 12

Which of the following influence(s)patient comfort when local anesthetics are delivered?

A) Needle sharpness
B) Appropriate explanation of procedure
C) Warmed anesthetic cartridge
D) A and B
E) All of the above

Question 13

Which of the following anesthetic agents would be a good choice for a patient with a documented allergy to sulfites?

A) 2% Mepivacaine,levonordefrin 1:20,000
B) 2% Lidocaine,epinephrine 1:100,000
C) 3% Mepivacaine
D) 4% Articaine,epinephrine 1:100,000