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LOCAL ANETHESIA (Dental Hygiene) EXAM QUESTIONS ACCURATE ANSWERS AND WITH EXPLANATIONS A+ GRADED
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LOCAL ANETHESIA (Dental Hygiene) EXAM QUESTIONS ACCURATE ANSWERS AND WITH EXPLANATIONS A+ GRADED
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LOCAL ANETHESIA (Dental Hygiene)EXAM QUESTIONS ACCURATE ANSWERS
AND WITH EXPLANATIONS A+ GRADED
1. What part of the syringe indicates it is an aspirating syringe?
o Correct Answer: Harpoon
o Explanation: The harpoon is the part of the syringe that allows for aspiration, which is
the process of pulling back the plunger to check if the needle is in a blood vessel.
2. What antiseptic should NOT be used before an injection?
o Correct Answer: Alcohol
o Explanation: Alcohol should not be used before injections because it can cause irritation
and alter the effectiveness of the anesthetic.
3. What is a possible cause of pain upon removal of the needle?
o Correct Answer: Needle barb
o Explanation: A barb on the needle can cause pain or discomfort when it is withdrawn
from the tissue.
4. How does a self-aspirating syringe work?
o Correct Answer: When pressure is released, it aspirates
o Explanation: A self-aspirating syringe allows for automatic aspiration when the pressure
on the plunger is released.
5. What causes a hematoma?
o Correct Answer: Injecting into the pterygoid plexus during a PSA injection
o Explanation: A hematoma occurs when a needle punctures a blood vessel, such as the
pterygoid plexus during a PSA (Posterior Superior Alveolar) injection.
6. Needle gauge: which lumen is the smallest?
o Correct Answer: Smaller number, larger lumen
o Explanation: A needle's gauge refers to its diameter. The smaller the gauge number, the
larger the lumen (hole) in the needle.
7. What sensation is lost first during local anesthesia?
o Correct Answer: Pain
, o Explanation: Pain sensation is typically the first to be blocked during anesthesia due to
its faster transmission in nerve fibers.
8. What function does sodium chloride provide in local anesthetic solutions?
o Correct Answer: Makes the solution isotonic
o Explanation: Sodium chloride is added to anesthetic solutions to make them isotonic
with body tissues, preventing irritation.
9. Which local anesthetic should be avoided in patients with a sulfa allergy?
o Correct Answer: Articaine
o Explanation: Articaine contains a sulfur molecule and should be avoided in patients with
a sulfa allergy.
10. If a patient receives 3 cartridges of 3% mepivacaine (1.7 ml each), how much drug did they
receive?
o Correct Answer: 153 mg
o Explanation: 3% mepivacaine means 30 mg per 1 ml. For 3 cartridges (1.7 ml each), the
total dose is (1.7 x 30) x 3 = 153 mg.
11. What type of injection is local anesthesia?
o Correct Answer: Subcutaneous
o Explanation: Local anesthesia is typically injected subcutaneously, beneath the skin but
not into muscle.
12. Where would you inject to anesthetize the maxillary incisors?
o Correct Answer: Papilla
o Explanation: The injection site is at the papilla (the soft tissue at the base of the tooth)
to achieve effective anesthesia for the maxillary incisors.
13. What is the least preferable way to recap a needle?
o Correct Answer: Two-hand method
o Explanation: The two-hand method is considered unsafe because it increases the risk of
needlestick injuries. The one-handed scoop method is safer.
14. Do myelinated nerves transmit impulses faster or slower than unmyelinated nerves?
o Correct Answer: Faster
o Explanation: Myelinated nerves transmit impulses faster due to the insulation provided
by the myelin sheath, which allows for faster conduction.
15. Which injection numbs the lower lip?
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