CDCA Local Anesthesia Exam | Questions
and Answers Rated A+ |100% Verified |
2026\2027 Guide
The rapid influx of sodium ions into the interior of the nerve cell causes
depolarization of the nerve membrane from its resting level to its
_________________.
- Correct Answer - Firing Threshold
The firing threshold is the magnitude of the decrease in negative
transmembrane potential necessary to initiate an _______________.
- Correct Answer - Action potential
Why should injection needles not be inserted to their hub?
- Correct Answer - The hub is the most rigid/weakest part of the needle
When is a long (32 mm) needle preferred for injections?
- Correct Answer - For all injections where a significant thickness of soft
tissue must be penetrated (IANB)
Generic = Lidocaine
- Correct Answer - Brand name = Xylocaine
,Generic = Mepivacaine
- Correct Answer - Brand name = Carbocaine
Generic = Prilocaine
- Correct Answer - Brand name = Citanest
(Citanest Forte = 1:200,000 epi)
Generic = Articaine - Correct Answer - Brand name = Septocaine
Generic = Bupivacaine - Correct Answer - Brand name = Marcaine
What is the most common reason for a lesion on the lower lip a day after
injection? - Correct Answer - Recurrent aphthous stomatitis, herpes
simplex
Needles and cartridges are disposed in a ____. - Correct Answer -
Sharps container
(answer may be needles only)
How does infiltration work? - Correct Answer - Small terminal nerve
endings are flooded with local anesthetic
, How does a nerve block work? - Correct Answer - Local anesthetic is
deposited near a main nerve trunk
Palatal injections only ______. - Correct Answer - Anesthetize soft tissue
(not pulpal tissue)
Where is topical anesthetic least effective? - Correct Answer -
Keratinized tissue on hard palate
What nerve was anesthetized if the cornea of the eye is numb? - Correct
Answer - 1st branch of the Trigeminal Nerve (V-1) (specifically the ciliary
nerves)
What causes a dry cornea? - Correct Answer - IANB injection not
contacting bone and going into parotid gland - anesthesia to the facial
nerve
What is the benefit of slow deposition of local anesthetic? - Correct
Answer - Less painful, less complications
Expiration dates of local anesthetic - Correct Answer - Plain anesthetics
= 36 months
Anesthetics with vasoconstrictor = 18 months
(Sodium bisulfite)
and Answers Rated A+ |100% Verified |
2026\2027 Guide
The rapid influx of sodium ions into the interior of the nerve cell causes
depolarization of the nerve membrane from its resting level to its
_________________.
- Correct Answer - Firing Threshold
The firing threshold is the magnitude of the decrease in negative
transmembrane potential necessary to initiate an _______________.
- Correct Answer - Action potential
Why should injection needles not be inserted to their hub?
- Correct Answer - The hub is the most rigid/weakest part of the needle
When is a long (32 mm) needle preferred for injections?
- Correct Answer - For all injections where a significant thickness of soft
tissue must be penetrated (IANB)
Generic = Lidocaine
- Correct Answer - Brand name = Xylocaine
,Generic = Mepivacaine
- Correct Answer - Brand name = Carbocaine
Generic = Prilocaine
- Correct Answer - Brand name = Citanest
(Citanest Forte = 1:200,000 epi)
Generic = Articaine - Correct Answer - Brand name = Septocaine
Generic = Bupivacaine - Correct Answer - Brand name = Marcaine
What is the most common reason for a lesion on the lower lip a day after
injection? - Correct Answer - Recurrent aphthous stomatitis, herpes
simplex
Needles and cartridges are disposed in a ____. - Correct Answer -
Sharps container
(answer may be needles only)
How does infiltration work? - Correct Answer - Small terminal nerve
endings are flooded with local anesthetic
, How does a nerve block work? - Correct Answer - Local anesthetic is
deposited near a main nerve trunk
Palatal injections only ______. - Correct Answer - Anesthetize soft tissue
(not pulpal tissue)
Where is topical anesthetic least effective? - Correct Answer -
Keratinized tissue on hard palate
What nerve was anesthetized if the cornea of the eye is numb? - Correct
Answer - 1st branch of the Trigeminal Nerve (V-1) (specifically the ciliary
nerves)
What causes a dry cornea? - Correct Answer - IANB injection not
contacting bone and going into parotid gland - anesthesia to the facial
nerve
What is the benefit of slow deposition of local anesthetic? - Correct
Answer - Less painful, less complications
Expiration dates of local anesthetic - Correct Answer - Plain anesthetics
= 36 months
Anesthetics with vasoconstrictor = 18 months
(Sodium bisulfite)
