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Patient Care and Chairside Procedures

Local Anaesthesia and Pain Management Practice Questions

20 free Local Anaesthesia and Pain Management practice questions for the CDA. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.

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Question 1 of 20 Medium

Which local anesthetic injection is most commonly used to anesthetize the maxillary posterior teeth?

  1. A Inferior alveolar nerve block
  2. B Posterior superior alveolar nerve block
  3. C Greater palatine nerve block
  4. D Long buccal nerve block

Correct answer: Posterior superior alveolar nerve block

The PSA block anesthetizes the maxillary molars. It is widely used for posterior maxillary procedures.

Question 2 of 20 Medium

Which component of local anesthetic solution prolongs anesthesia and reduces bleeding?

  1. A Buffering agent
  2. B Epinephrine
  3. C Preservative
  4. D Saline carrier

Correct answer: Epinephrine

Epinephrine constricts blood vessels, which keeps anesthetic at the site longer and reduces bleeding. It also increases depth of anesthesia.

Question 3 of 20 Medium

Which symptom suggests a patient may be experiencing local anesthetic toxicity?

  1. A Persistent dry mouth
  2. B Numbness in both legs
  3. C Ringing in the ears
  4. D Slowed respiration rate

Correct answer: Ringing in the ears

Early signs include ringing in the ears, metallic taste, and dizziness. Toxicity can progress to seizures if untreated.

Question 4 of 20 Medium

Which injection anesthetizes the entire lower quadrant on one side of the mouth?

  1. A Mental nerve block
  2. B Inferior alveolar nerve block
  3. C Incisive nerve block
  4. D Posterior superior alveolar nerve block

Correct answer: Inferior alveolar nerve block

The inferior alveolar block numbs all mandibular teeth on one side. It also partially affects the lip and chin.

Question 5 of 20 Medium

Topical anesthetics are most effective when applied for:

  1. A 5–10 seconds
  2. B 30–60 seconds
  3. C 2–3 minutes
  4. D 5 minutes

Correct answer: 30–60 seconds

Topicals need around 30 to 60 seconds to penetrate tissue. This helps reduce needle insertion discomfort.

Question 6 of 20 Medium

Which local anesthetic complication results from injecting into the parotid gland area during mandibular block?

  1. A Transient facial paralysis
  2. B Trismus of the jaw muscles
  3. C Hematoma at the injection site
  4. D Prolonged paresthesia of the lip

Correct answer: Transient facial paralysis

If anesthetic is placed too far posteriorly, the facial nerve may be affected. The patient will show inability to close the eyelid temporarily.

Question 7 of 20 Medium

A vasoconstrictor is contraindicated in which type of patient?

  1. A Healthy adult
  2. B Controlled diabetic
  3. C Uncontrolled cardiac patient
  4. D Pregnant patient in second trimester

Correct answer: Uncontrolled cardiac patient

Uncontrolled cardiac disease increases risks with vasoconstrictors. These patients may need anesthetic without epinephrine.

Question 8 of 20 Medium

Which gauge needle is typically used for inferior alveolar nerve blocks?

  1. A 30-gauge short
  2. B 30-gauge long
  3. C 27-gauge long
  4. D 25-gauge short

Correct answer: 27-gauge long

A 27-gauge long needle provides adequate strength and less deflection for mandibular blocks. Long needles are required to reach deep tissue landmarks.

Question 9 of 20 Medium

Which step is essential for preventing intravascular injection during local anesthesia?

  1. A Inject the anesthetic solution rapidly
  2. B Aspirate before injection
  3. C Use only short needles for all blocks
  4. D Keep needle movement constant

Correct answer: Aspirate before injection

Aspirating ensures the needle is not within a blood vessel. This prevents toxicity and other complications.

Question 10 of 20 Medium

Which injection anesthetizes the lower lip and chin area?

  1. A Lingual nerve block
  2. B Mental nerve block
  3. C PSA nerve block
  4. D Greater palatine block

Correct answer: Mental nerve block

The mental nerve supplies sensation to the lower lip and chin. The mental block does not anesthetize the teeth.

Question 11 of 20 Medium

What should the assistant do if a patient reports their heart racing immediately after injection?

  1. A Call emergency services immediately
  2. B Reassure the patient; a common epinephrine effect
  3. C Stop the procedure immediately and send the patient home
  4. D Give the patient glucose

Correct answer: Reassure the patient; a common epinephrine effect

Epinephrine can cause temporary palpitations. Reassurance and observation are often sufficient unless symptoms persist.

Question 12 of 20 Medium

Which anesthetic technique is best for numbing the palate for a maxillary extraction?

  1. A Mental nerve block
  2. B PSA block
  3. C Greater palatine block
  4. D Inferior alveolar block

Correct answer: Greater palatine block

The greater palatine block anesthetizes palatal tissues of the posterior maxilla. Palatal anesthesia is required for extractions.

Question 13 of 20 Medium

Which factor increases the likelihood of trismus after anesthesia?

  1. A Slow injection
  2. B Using a new needle
  3. C Repeated needle penetrations
  4. D Injection without vasoconstrictor

Correct answer: Repeated needle penetrations

Multiple needle passes increase tissue trauma, leading to trismus. Proper technique reduces this risk.

Question 14 of 20 Medium

Which analgesic is commonly recommended for mild to moderate dental pain?

  1. A Acetaminophen
  2. B Codeine
  3. C Morphine
  4. D Dextromethorphan

Correct answer: Acetaminophen

Acetaminophen is safe and effective for mild pain. It is often used alone or in combination with NSAIDs.

Question 15 of 20 Medium

Which NSAID is most frequently used for controlling inflammation after dental procedures?

  1. A Ibuprofen
  2. B Aspirin
  3. C Acetaminophen
  4. D Tramadol

Correct answer: Ibuprofen

Ibuprofen provides strong anti-inflammatory effects. It is commonly recommended for postoperative pain.

Question 16 of 20 Medium

Which sign suggests an allergic reaction to local anesthetic preservatives rather than the anesthetic itself?

  1. A Sensation of warmth
  2. B Hives and itching
  3. C Temporary numbness
  4. D Mild lightheadedness

Correct answer: Hives and itching

Hives indicate a hypersensitivity response, usually to preservatives like sulfites. True anesthetic allergies are rare.

Question 17 of 20 Medium

What should the assistant prepare when the dentist is administering a palatal injection?

  1. A Cotton roll isolation and retraction
  2. B High suction and reassurance
  3. C Bite block for stabilization
  4. D Full rubber dam setup and clamp placement

Correct answer: High suction and reassurance

Palatal injections can be uncomfortable due to dense tissue. Good suction and patient reassurance help ease the process.

Question 18 of 20 Medium

Which condition requires caution with epinephrine-containing anesthetics?

  1. A Asthma
  2. B Thyroid disease
  3. C Hypertension
  4. D Seasonal allergies

Correct answer: Hypertension

Hypertensive patients may react strongly to vasoconstrictors. Epinephrine should be limited or avoided depending on severity.

Question 19 of 20 Medium

Which injection anesthetizes the canine and incisor teeth in the upper jaw?

  1. A Middle superior alveolar block
  2. B Infraorbital nerve block
  3. C Greater palatine block
  4. D Inferior alveolar block

Correct answer: Infraorbital nerve block

The infraorbital block covers maxillary incisors and canines. It also affects the upper lip and side of the nose.

Question 20 of 20 Medium

What is the best way to reduce patient anxiety before administering local anesthesia?

  1. A Show the patient the needle
  2. B Explain the procedure and reassure
  3. C Administer the injection as quickly as possible
  4. D Increase the anesthetic dose

Correct answer: Explain the procedure and reassure

Clear, calming communication reduces fear and improves cooperation. Anxiety control helps minimize perceived pain.

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