Pain and introduction in local anesthesia l Oral surgery MCQs for dental students 

Pain and local anesthesia MCQ in oral surgery

1. Definition of pain:

A. It’s unpleasant sensation created by noxious stimulus

B. It is pleasant sensation created by a noxious stimulus.

C. It’s unpleasant sensation created by movement of the tongue

D. It’s unpleasant sensation created by saliva

2. A nerve is absolutely refractory during:

A. Depolarisation

B. After depolarisation

C. Hyperpolarisation

D. Firing level only

3. Analgesia means:

A. Loss of consciousness

B. Loss of pain sensation and loss of consciousness

C. Loss of pain sensation without loss of consciousness

D. All of the above

4. Which of the following local anesthetic agents is vasoconstrictor?

A. Procaine

B. Cocaine

C. Xylocaine

D. Benzocaine

5. Which of the following is true about local anesthetic agents?

A. A All local anesthetic agents are vasodilators

B. All local anesthetic agents are vasoconstrictors

C. All local anesthetic agents are vasodilators except cocaine which is a vasoconstrictor

D. All local anesthetic agents are metabolized in liver

6. Which of the following local anesthetic agents is not synthetic?

A. Procaine

B. Cocaine

C. Xylocaine

D. Tetracaine

7. Which of the followings is an amide type of local anesthetic agent?

A. Procaine

B. Chloroprocaine

C. Tetracaine

D. Lidocaine

8. Protein binding property of L.A. agents affect its:

A. Duration of action

B. Onset

C. Tachyphlaxis

D. Toxic effect

9. Amide type of local anesthetic agents are metabolized in:

A. Liver

B. Plasma

C. Kidney

D. Lung

10. Ester type local anesthetics are metabolized in the:

A. Liver only

B. Kidney

C. Plasma

D. Lungs

11. Which of the following sensations is lost first under local anesthesia?

A. Pain

B. Touch

C. Pressure

D. Thermal

12. How many mg of 2% lidocaine is present in the cartidge?

A. 18mg

B. 36mg

C. 180 mg

D. 360 mg

13. Local anaesthetic agents act by:

A. Increasing the rate of depolarisation

B. Shortening the rate of repolarization

C. Decreasing the threshold potential

D. Increasing the threshold potential

14. The local anaesthetic agent acts on:

A. Nerve membrane

В. Ахорlasm

C. Epineurium

D. Perineurium

15. The most acceptable theory which explains the actions of Local Anesthesia:

A. Surface charge theory

B. Calcium displacement theory

C. Membrane expansion theory

D. Receptor binding theory

16. The ultimate action of binding the receptor by LA agent is brought about by its:

A. Hydrophilic component

B. Lipophilic component

C. Intermediary chain

D. RN of amide agents

17. Amide group of local anaesthetic agents are dispensed as salts of strong acids because:

A. They are not lipid soluble but stable in air

B. They are not water soluble but stable in air

C. They are not water soluble & unstable in air

D. They are lipid soluble but stable in air

18. In acidic medium (during pyogenic infections) local anaesthetics are less effective because:

A. More uncharged particles are released

B. Less uncharged particles are released

C. Less charged particles are release

D. None of the above

19. Local anaesthetic agents with higher pka would have:

A. Shorter onset of action

B. Longer onset of action

C. No affect on onset of action

D. None of the above

20. A nerve can be stimulated during relative refractory period by:

A. Stronger than normal stimuli

B. Sustained normal stimuli

C. Subthreshold stimuli

D. None of the above