Question 1

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

Accepted Answer

2% Lidocaine with epinephrine 1:100,000 is preferred for procedures expected to last 1.5 hours because it provides a moderate duration of action (approximately 2 hours for soft tissue anesthesia) and the addition of epinephrine prolongs the duration of action and minimizes bleeding in the area of the procedure.

Question 2

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

Accepted Answer

Sulfite allergy is an absolute contraindication to vasoconstrictors because many vasoconstrictor solutions contain sulfites as preservatives, which can cause severe allergic reactions in individuals with a 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?

Accepted Answer

A

Question 4

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

Accepted Answer

Topical anesthetics are indeed most effective on dry tissue and have limited effects on keratinized tissues like the palate. Their penetration depth is generally less than 2 mm, making options A and C correct.

Question 5

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

Accepted Answer

The infraorbital nerve is a branch of the maxillary division of the trigeminal nerve.

Question 6

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

Accepted Answer

The answer of Which portion(s)of the anesthetic molecule is necessary...

Question 7

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

Accepted Answer

The bevel of the needle should be oriented opposite the syringe window for a maxillary infiltration of tooth 8 because this will help to ensure that the anesthetic solution is deposited into the correct location.

Question 8

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

Accepted Answer

The MSA (Middle Superior Alveolar) nerve block is typically used to anesthetize the maxillary first and second premolars and the mesiobuccal root of the first molar.

Question 9

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

Accepted Answer

A 30 gauge needle is thinner than 25 and 27 gauge needles, making it more flexible and likely to deflect when traveling through tissue.

Question 10

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

Accepted Answer

Statements that provide positive reinforcement and clear instructions without minimizing the patient's potential discomfort are most effective. "You're doing great. We're almost finished." and "Take a nice deep breath. We are going to begin." are both supportive and instructive, making them good choices for communication during anesthetic delivery.

Question 11

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

Accepted Answer

The maximum dose of 2% lidocaine is 500 mg. One cartridge of 2% lidocaine contains 20 mg. Therefore, the maximum number of cartridges that can be given is 500 mg / 20 mg/cartridge = 25 cartridges. The patient weighs 180 lb, which is within the weight range for which the maximum dose of 2% lidocaine is 500 mg. Therefore, the maximum dose of 2% lidocaine for this patient is 25 cartridges.

Question 12

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

Accepted Answer

The answer of Which of the following influence(s)patient comfort when...

Question 13

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

Accepted Answer

3% Mepivacaine is a good choice for patients with a sulfite allergy because it does not contain vasoconstrictors like epinephrine or levonordefrin, which are typically stabilized with sulfites.

Quiz 39: Local Anesthesia