MCQs in Oral & Maxillofacial Surgery

Chapter 8: Local Anesthesia


1- Vasoconstrictor in local anesthetics (LA) solution:

  1. Reduces toxic effects of LA solution.
  2. Decreases depth & duration of LA.
  3. Increases bleeding.
  4. Increases toxic effects of LA.
  5. Has no effect on efficacy of LA solution.







The answer is: A


2- Reducing agent in LA solution is:

  1. Methyl paraben.
  2. Sodium metabisulphite.
  3. Thymol.
  4. Adrenaline.
  5. Ringer lactate.







The answer is: B


3- Needle used for infilteration is:

  1. 30 gauge.
  2. 25 gauge.
  3. 27 gauge.
  4. 16 gauge.
  5. 18 gauge.






 The answer is: A


4- When injecting LA solution in maxilla on buccal side. The technique is:

  1. Sub periosteal.
  2. Supra periosteal.
  3. Sub mucosal.
  4. Intra osseous.
  5. Intra septal.







The answer is: B


5- Most common complication of posterior Superior alveolar nerve block is:

  1. Trismus.
  2. Hematoma.
  3. Infection.
  4. Facial palsy.
  5. Blanching of the area.







The answer is: B


6- Blanching at the site of injection is caused by:

  1. Increased tissue tension.
  2. Local effects of reducing agent in LA solution.
  3. Decreased tissue tension.
  4. Infection at the site of injection.
  5. Warm LA solution.







The answer is: A



7- Technique of anesthesia in which local anesthetic solution is injected into the vein is:

  1. Nerve block.
  2. Infilteration anesthesia.
  3. Intra venous regional anesthesia.
  4. Epidural anesthesia.
  5. No such technique exists.







The answer is: C


8-Local anesthetic solution with highest tissue irritancy is:

  1.  Procaine
  2. Lignocaine
  3. Bupivacaine
  4. Mepivacaine
  5. Chloroprocaine






The answer is: D


9- Nitrous Oxide that is used as anesthetic agent has mechanism of action as:


  1. Gasserian ganglion block
  2. Block peripheral nerves
  3. Reversible (indirect) depression of CNS
  4. Block Neural trunk







The answer is: C



10- The anesthetic drug injected for paravertebral block is least likely tp diffuse into:


  1. Epidural space
  2. Subarachonoid space
  3. Intercostal space
  4. Superior and inferior paravertebral spaces






The answer is: B



11- Which of the following is not a sign of successful stellate ganglion block:


  1. Nasal stuffiness
  2. Guttmann sign
  3. Horner’s syndrome
  4. Bradycardia







The answer is: D



12- Criteria for an ideal anelgesic drug:


  1. Rapid onset of action, high efficacy, intermediate duration
  2. Rapid onset of action, intermediate efficacy, long duration
  3. Rapid onset of action, high efficacy, long duration
  4. Intermediate onset of action, high efficacy, intermediate duration







The answer is: C