CDCA EXAM QUESTIONS & ANSWERS
Esters - Answer -What local anesthetic is metabolized by pseudocholinesterase?
In the blood plasma by the enzyme pseudocholinesterase - Answer -Where are ester
local anesthetics hydrolyzed?
Liquid alcohol - Answer -Which antiseptic should not be used?
None of the above - Answer -Before using a cartridge you should:
1) wipe it with disinfectant
2) soak it in alcohol
3) autoclave it and or sterilize it?
Harpoon - Answer -What part of the syringe indicates that it is an aspirating syringe?
Needle barb from impaling bone - Answer -What is a possible cause of pain on removal
of the needle?
Psychogenic pain - Answer -If there is no organic basis for pain
When you let off pressure from injecting it self-aspirates (negative pressure built into the
syringe) - Answer -How does a self aspirating syringe work
Immediately before you inject local anesthetic - Answer -When do you aspirate?
increases depth and duration of anesthetic, decreases absorption of local anesthetic
and vasopressor - Answer -What is the action of vasodepressors in local anesthetic?
Normal, healthy patient is 0.2 mg
Cardiac patient is 0.04 mg - Answer -Maximum Doses of Epinephrine
.036 mg - Answer -How much epinephrine is in a cartridge of 1:50,000 epinephrine?
0.018 mg - Answer -How much epinephrine is in a cartridge of 1:100,000 epinephrine?
0.009 mg - Answer -How much epinephrine is in a cartridge of 1:200,000 epinephrine?
Common in pterygoid plexus of veins with a PSA injection - Answer -What causes a
hematoma?
Apply pressure for at least 2 minutes, Ice the area immediately, and then use warm
moist towels 4-6 hours after to area, rinse with salt water
, (most likely with PSA- pterygoid plexus of veins) - Answer -Treatment of Hematoma
(the effusion of blood into extravascular spaces and can result from nicking a blood
vessel, artery or vein)
1.8 ml or 1.7 ml - Answer -What is the volume of local anesthetic in a cartridge?
Smaller the number, larger the lumen
30 = small
27 = intermediate
25 = large - Answer -How do you determine gauge and lumen size of a needle?
30 gauge - Answer -What needle gauge has the smallest lumen?
Pain - Answer -What sensation is lost first?
Makes the solution isotonic with tissue - Answer -What function does sodium chloride
provide in local anesthetic solution?
Sodium (meta) bisulfite - Answer -What antioxidant prevents biodegradation of
vasoconstrictors?
Antioxidant prevents oxidation of the vasopressor by oxygen which might be trapped in
the cartridge by the manufacturer or diffuse through the cartridge's latex diaphragm -
Answer -What is the role of sodium bisulfite in local anesthetic?
Weakening of the dental needle by bending it before insertion into the patient's mouth
2nd most common reason is patient movement during injection - Answer -Primary
cause of needle separation (breakage)?
When the needle contacts the nerve sheath - Answer -When does a patient receive an
electrical shock sensation during and injection?
Less bone density
(thinner cortical plate of bone) - Answer -Why does infiltration work better in the
maxilla?
Procaine (novacain) - Answer -What local anesthetic is not an amide?
15 min - Answer -How long can you safely leave a Dentipatch (EMLA) on tissue?
3% Mepivacaine Plain - Answer -Most commonly used plain local anesthetic?
27 or 30 gauge - Answer -What gauge needle can be used for infiltration injections?
Procaine (novacaine) - Answer -Which local anesthetic is an ester?
Esters - Answer -What local anesthetic is metabolized by pseudocholinesterase?
In the blood plasma by the enzyme pseudocholinesterase - Answer -Where are ester
local anesthetics hydrolyzed?
Liquid alcohol - Answer -Which antiseptic should not be used?
None of the above - Answer -Before using a cartridge you should:
1) wipe it with disinfectant
2) soak it in alcohol
3) autoclave it and or sterilize it?
Harpoon - Answer -What part of the syringe indicates that it is an aspirating syringe?
Needle barb from impaling bone - Answer -What is a possible cause of pain on removal
of the needle?
Psychogenic pain - Answer -If there is no organic basis for pain
When you let off pressure from injecting it self-aspirates (negative pressure built into the
syringe) - Answer -How does a self aspirating syringe work
Immediately before you inject local anesthetic - Answer -When do you aspirate?
increases depth and duration of anesthetic, decreases absorption of local anesthetic
and vasopressor - Answer -What is the action of vasodepressors in local anesthetic?
Normal, healthy patient is 0.2 mg
Cardiac patient is 0.04 mg - Answer -Maximum Doses of Epinephrine
.036 mg - Answer -How much epinephrine is in a cartridge of 1:50,000 epinephrine?
0.018 mg - Answer -How much epinephrine is in a cartridge of 1:100,000 epinephrine?
0.009 mg - Answer -How much epinephrine is in a cartridge of 1:200,000 epinephrine?
Common in pterygoid plexus of veins with a PSA injection - Answer -What causes a
hematoma?
Apply pressure for at least 2 minutes, Ice the area immediately, and then use warm
moist towels 4-6 hours after to area, rinse with salt water
, (most likely with PSA- pterygoid plexus of veins) - Answer -Treatment of Hematoma
(the effusion of blood into extravascular spaces and can result from nicking a blood
vessel, artery or vein)
1.8 ml or 1.7 ml - Answer -What is the volume of local anesthetic in a cartridge?
Smaller the number, larger the lumen
30 = small
27 = intermediate
25 = large - Answer -How do you determine gauge and lumen size of a needle?
30 gauge - Answer -What needle gauge has the smallest lumen?
Pain - Answer -What sensation is lost first?
Makes the solution isotonic with tissue - Answer -What function does sodium chloride
provide in local anesthetic solution?
Sodium (meta) bisulfite - Answer -What antioxidant prevents biodegradation of
vasoconstrictors?
Antioxidant prevents oxidation of the vasopressor by oxygen which might be trapped in
the cartridge by the manufacturer or diffuse through the cartridge's latex diaphragm -
Answer -What is the role of sodium bisulfite in local anesthetic?
Weakening of the dental needle by bending it before insertion into the patient's mouth
2nd most common reason is patient movement during injection - Answer -Primary
cause of needle separation (breakage)?
When the needle contacts the nerve sheath - Answer -When does a patient receive an
electrical shock sensation during and injection?
Less bone density
(thinner cortical plate of bone) - Answer -Why does infiltration work better in the
maxilla?
Procaine (novacain) - Answer -What local anesthetic is not an amide?
15 min - Answer -How long can you safely leave a Dentipatch (EMLA) on tissue?
3% Mepivacaine Plain - Answer -Most commonly used plain local anesthetic?
27 or 30 gauge - Answer -What gauge needle can be used for infiltration injections?
Procaine (novacaine) - Answer -Which local anesthetic is an ester?
