©THEBRIGHTSTARS 2024
Local Anesthetics for Dental Hygienists--
Final Exam Review Questions With Correct
Answers
T/F: A 25 gauge needle has a larger diameter than a 30 gauge needle - answer✔✔True
T/F: Due to the effectiveness of LA drugs, exposure of a 1 to 3 mm section if nerve membrane to
an anesthetic solution is adequate to ensure profound anesthesia - answer✔✔False
In myelinated nerves, LA molecules are effective: - answer✔✔Only at the Nodes of Ranvier
T/F: LA drugs are effective only at the nodes if Ranvier and in order to be effective, multiple
nodes must be exposed to the drug to block impulses - answer✔✔True
Nerve impulses travel rapidly on myelinated nerves because - answer✔✔impulses bypass nodes
and travel up to 8 to 10 mm to subsequent nodes, decreasing the length of nerve over which
impulses must be generated
T/F: The large window of the syringe barrel should be positioned away from the clinician
throughout the injection to prevent the event the cartridge shatters during injection -
answer✔✔False
What is the correct relationship of Schwann cells to the nodes of Ranvier - answer✔✔Nodes of
Ranvier are gaps between Schwann cells
Which cells produce myelin - answer✔✔Schwann cells
Which description of nerve membrane is correct - answer✔✔bilayered phospholipidmembranes
Which of the following sequences best describe the events in a successful impulse generation -
answer✔✔stimulation, slow depolarization, firing threshold, rapid depolarization, recovery
Which of the following strategies helps patients cope with anxiety and fear - answer✔✔prepare,
rehearse, empower, and praise the patient to reduce anxiety and fear
Which positively charged ion functions as a gatekeeper in ion channels - answer✔✔calcium
, ©THEBRIGHTSTARS 2024
Which statement correctly describes pain threshold - answer✔✔it is identified when a stimulus
begins to produce pain
What statement is true regarding the specific protein receptor theory - answer✔✔LA molecules
displace calcium ions at receptor site
Which statement best describes pain as a protective response - answer✔✔pain is rapid, reflexive,
unconscious reaction
Which two ions are responsible for uniterrupted maintenance of teh resting potential across the
nerve membrane - answer✔✔K+ and Na+
Bevel =
long needle =
short needle=
gauge =
lumen= - answer✔✔angled tip of the needle
32mm
22mm
internal diameter of needle
hollow part of the needle
T/F: Both the incisive nerve and mental nerve are a continuation of the inferior alveolar nerve.
The incisive nerve continues within the mandible to the anterior portion of the mandible and the
mental nerve exits the mandible through the mental foramen. - answer✔✔Both are TRUE
T/F: Depolarization refers to a potential change across a nerve membrane from -70 mV to +40
mV - answer✔✔True
Elimination half life refers to the time it takes for half of a drug to be - answer✔✔out of the
circulation
T/F: Epinephrine is an absolute contraindication for patients with poorly controlled or
uncontrolled hyperthyroidism. - answer✔✔True
Ester-type local anesthestic drugs are biotransformed in the - answer✔✔blood by
pseudocholinesterase
Following a relatively severe heart attack, how long should elective dental treatment be delayed?
- answer✔✔Six months
Local Anesthetics for Dental Hygienists--
Final Exam Review Questions With Correct
Answers
T/F: A 25 gauge needle has a larger diameter than a 30 gauge needle - answer✔✔True
T/F: Due to the effectiveness of LA drugs, exposure of a 1 to 3 mm section if nerve membrane to
an anesthetic solution is adequate to ensure profound anesthesia - answer✔✔False
In myelinated nerves, LA molecules are effective: - answer✔✔Only at the Nodes of Ranvier
T/F: LA drugs are effective only at the nodes if Ranvier and in order to be effective, multiple
nodes must be exposed to the drug to block impulses - answer✔✔True
Nerve impulses travel rapidly on myelinated nerves because - answer✔✔impulses bypass nodes
and travel up to 8 to 10 mm to subsequent nodes, decreasing the length of nerve over which
impulses must be generated
T/F: The large window of the syringe barrel should be positioned away from the clinician
throughout the injection to prevent the event the cartridge shatters during injection -
answer✔✔False
What is the correct relationship of Schwann cells to the nodes of Ranvier - answer✔✔Nodes of
Ranvier are gaps between Schwann cells
Which cells produce myelin - answer✔✔Schwann cells
Which description of nerve membrane is correct - answer✔✔bilayered phospholipidmembranes
Which of the following sequences best describe the events in a successful impulse generation -
answer✔✔stimulation, slow depolarization, firing threshold, rapid depolarization, recovery
Which of the following strategies helps patients cope with anxiety and fear - answer✔✔prepare,
rehearse, empower, and praise the patient to reduce anxiety and fear
Which positively charged ion functions as a gatekeeper in ion channels - answer✔✔calcium
, ©THEBRIGHTSTARS 2024
Which statement correctly describes pain threshold - answer✔✔it is identified when a stimulus
begins to produce pain
What statement is true regarding the specific protein receptor theory - answer✔✔LA molecules
displace calcium ions at receptor site
Which statement best describes pain as a protective response - answer✔✔pain is rapid, reflexive,
unconscious reaction
Which two ions are responsible for uniterrupted maintenance of teh resting potential across the
nerve membrane - answer✔✔K+ and Na+
Bevel =
long needle =
short needle=
gauge =
lumen= - answer✔✔angled tip of the needle
32mm
22mm
internal diameter of needle
hollow part of the needle
T/F: Both the incisive nerve and mental nerve are a continuation of the inferior alveolar nerve.
The incisive nerve continues within the mandible to the anterior portion of the mandible and the
mental nerve exits the mandible through the mental foramen. - answer✔✔Both are TRUE
T/F: Depolarization refers to a potential change across a nerve membrane from -70 mV to +40
mV - answer✔✔True
Elimination half life refers to the time it takes for half of a drug to be - answer✔✔out of the
circulation
T/F: Epinephrine is an absolute contraindication for patients with poorly controlled or
uncontrolled hyperthyroidism. - answer✔✔True
Ester-type local anesthestic drugs are biotransformed in the - answer✔✔blood by
pseudocholinesterase
Following a relatively severe heart attack, how long should elective dental treatment be delayed?
- answer✔✔Six months
