LOCAL ANESTHETICS FOR DENTAL HYGIENISTS--FINAL
EXAM REVIEW SOLVED #2
T/F: A 25 gauge needle has a larger diameter than a 30 gauge needle - correct 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 -
correct answer False
In myelinated nerves, LA molecules are effective: - correct 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 - correct answer True
Nerve impulses travel rapidly on myelinated nerves because - correct 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 -
correct answer False
What is the correct relationship of Schwann cells to the nodes of Ranvier - correct
answer Nodes of Ranvier are gaps between Schwann cells
Which cells produce myelin - correct answer Schwann cells
Which description of nerve membrane is correct - correct answer bilayered
phospholipidmembranes
Which of the following sequences best describe the events in a successful impulse
generation - correct answer stimulation, slow depolarization, firing threshold, rapid
depolarization, recovery
Which of the following strategies helps patients cope with anxiety and fear - correct
answer prepare, rehearse, empower, and praise the patient to reduce anxiety and fear
Which positively charged ion functions as a gatekeeper in ion channels - correct answer
calcium
Which statement correctly describes pain threshold - correct answer it is identified when
a stimulus begins to produce pain
, What statement is true regarding the specific protein receptor theory - correct answer
LA molecules displace calcium ions at receptor site
Which statement best describes pain as a protective response - correct answer pain is
rapid, reflexive, unconscious reaction
Which two ions are responsible for uniterrupted maintenance of teh resting potential
across the nerve membrane - correct answer K+ and Na+
Bevel =
Long needle =
Short needle=
Gauge =
Lumen= - correct 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. - correct answer
Both are TRUE
T/F: Depolarization refers to a potential change across a nerve membrane from -70 mv
to +40 mv - correct answer True
Elimination half life refers to the time it takes for half of a drug to be - correct answer out
of the circulation
T/F: Epinephrine is an absolute contraindication for patients with poorly controlled or
uncontrolled hyperthyroidism. - correct answer True
Ester-type local anesthestic drugs are biotransformed in the - correct answer blood by
pseudocholinesterase
Following a relatively severe heart attack, how long should elective dental treatment be
delayed? - correct answer Six months
T/F: Gently pulling the mucosa taut will ease penetration of the needle and establish a
point of stability for the syringe - correct answer True
If the fourth half-life of lidocaine is 12.5, what is the fifth half-life? - correct answer 6.25
%
EXAM REVIEW SOLVED #2
T/F: A 25 gauge needle has a larger diameter than a 30 gauge needle - correct 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 -
correct answer False
In myelinated nerves, LA molecules are effective: - correct 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 - correct answer True
Nerve impulses travel rapidly on myelinated nerves because - correct 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 -
correct answer False
What is the correct relationship of Schwann cells to the nodes of Ranvier - correct
answer Nodes of Ranvier are gaps between Schwann cells
Which cells produce myelin - correct answer Schwann cells
Which description of nerve membrane is correct - correct answer bilayered
phospholipidmembranes
Which of the following sequences best describe the events in a successful impulse
generation - correct answer stimulation, slow depolarization, firing threshold, rapid
depolarization, recovery
Which of the following strategies helps patients cope with anxiety and fear - correct
answer prepare, rehearse, empower, and praise the patient to reduce anxiety and fear
Which positively charged ion functions as a gatekeeper in ion channels - correct answer
calcium
Which statement correctly describes pain threshold - correct answer it is identified when
a stimulus begins to produce pain
, What statement is true regarding the specific protein receptor theory - correct answer
LA molecules displace calcium ions at receptor site
Which statement best describes pain as a protective response - correct answer pain is
rapid, reflexive, unconscious reaction
Which two ions are responsible for uniterrupted maintenance of teh resting potential
across the nerve membrane - correct answer K+ and Na+
Bevel =
Long needle =
Short needle=
Gauge =
Lumen= - correct 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. - correct answer
Both are TRUE
T/F: Depolarization refers to a potential change across a nerve membrane from -70 mv
to +40 mv - correct answer True
Elimination half life refers to the time it takes for half of a drug to be - correct answer out
of the circulation
T/F: Epinephrine is an absolute contraindication for patients with poorly controlled or
uncontrolled hyperthyroidism. - correct answer True
Ester-type local anesthestic drugs are biotransformed in the - correct answer blood by
pseudocholinesterase
Following a relatively severe heart attack, how long should elective dental treatment be
delayed? - correct answer Six months
T/F: Gently pulling the mucosa taut will ease penetration of the needle and establish a
point of stability for the syringe - correct answer True
If the fourth half-life of lidocaine is 12.5, what is the fifth half-life? - correct answer 6.25
%
