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DENTAL HYGIENE LOCAL ANESTHESIA EXAM 2025-2026 QUESTIONS AND CORRECT ANSWERS Where mandibular nerve passes through in the skull Foramen Ovale Where nasopalatine nerve passes through Incisive Foramen Maxillary division of Trigeminal Nerve is Sensory
Typology: Exams
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Where mandibular nerve passes through in the skull
Foramen Ovale
Where nasopalatine nerve passes through
Incisive Foramen
Maxillary division of Trigeminal Nerve is
Sensory
Nerve NOT associated with the mandibular nerve branch
Infraorbital nerve
Teeth that PSA innervates
1st, 2nd, and 3rd maxillary molars, but may not innervate MB root of the maxillary 1st molar
What injection is needed to anesthetize linguals of max anteriors
Nasopalatine
What injections are needed to anesthetize the entire palate on one side
Greater Palatine and Nasopalatine
How far do you insert the needle on an IANB?
20-25 mm or 3/4 the length of the needle
What happens during depolarization?
Sodium in and Potassium out
What is the significance of giving an amide anesthetic to a patient with cirrhosis?
Due to amide anesthetics being metabolized by the liver.
What is the landmark for the IANB injection?
Coronoid notch
Psychogenic pain
No organic base for the pain
Max epi dose for cardiac & normal pt
Cardiac- .04mg
Normal- .2mg
What is trismus?
Limited opening of mouth
Management of hematoma
Cold compression and pressure to bleeding site
Management of trismus
Heat therapy, saline rinses, asprin and jaw exercises
Hematoma can occur if needle penetrates into the pterygoid plexus of veins during which injection?
PSA
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What needle should be used for infiltration?
27g short
Volume of solution of a single cartridge of LA
1.8-1.7ml
Cause of burning upon injection
acidic pH of solution, injection too fast, cartridge being wiped with alcohol or sterilizing solution.
Cause of needle breakage
Bending needle, patient movement
Why would a patient receive an electric shock during delivery of anesthesia?
Needle touched the nerve sheath
Ongoing numbness of the anterior 2/3 of tongue is caused by which nerve being anesthetized?
Lingual Nerve
What is the benefit of slow deposition rate?
Less pain, less complications
Location for the long buccal injection
Distal and buccal to the 2nd mandibular molar
Why does anesthesia fail to work near an abscessed tooth?
Infection causes lower pH which does not allow ionization of sodium molecules
Nerve that innervates the soft palate
Lesser Palatine Nerve
First sign of local anesthesia toxicity
CNS excitement
Allergic reaction management
Antiseptic not to use
Alcohol
What is a poss cause of pain upon removal of the needle?
Needle barb
How a self aspirating syringe works
When let off pressure it aspirates
What causes a hematoma?
Injecting in the pterygoid plexus during a PSA injection
Needle gauge: which lumen is smallest?
Smaller number, larger the lumen
What sensation is lost first?
Pain
What function does sodium chloride provide in LA solutions?
Makes the solution isotonic
Local anes to avoid in patients with a sulfa allergy
Articaine
If a patient receives 3 1.7 ml cartridges of 3% mepivicaine, how much drug did she receive?
3% equals
=(1.7 x 30) x 3
=51 mg x 3
The answer is 153 mg.
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What type of injection is local anesthesia
Bit lip
Why infiltration works better in maxilla than mandible?
Mandible more dense
Where is epi naturally found in body?
Adrenal gland, endocrine
Which anesthetic is not an amide?
Procaine (all amides have an "i" in prefix)
What is anesthetic suggested deposit rate?
1ml/min
Where to inject if infiltrating lingual of molars
5-10mm from the free gingival margin
Injection site if you want infiltrate #13 lingual?
apex of tooth
Expiration date for local anesthesia drug
...
When giving a IA injection at what point will the needle contact the bone?
2/3 way is when needle will contact the Ramus
When you are giving an injection the pt experience no pain until Anesthetic is deposited what happen?
...
IA goes through what foramen
Risk of hematoma
PSA injection
Cause of transient facial paralysis
IA injection~ introducing anes. into the parotid gland
