Anesthesia · single question
What is the BEST method to confirm that local anesthesia is effective (patient is numb)?
Show answer and explanation
Correct answer: B. Cold test with refrigerant spray or ice
B) Cold test — CORRECT.
The most objective clinical method to verify pulp anesthesia is the cold test (negative response = profound anesthesia). This tests the actual sensory nerve blockade rather than relying on subjective patient report. For inferior alveolar nerve blocks, additional methods include lip numbness (soft tissue sign) but this doesn't confirm pulpal anesthesia.
A) Asking the patient: Subjective — patients may report feeling numb even with incomplete pulpal anesthesia, or may be anxious and uncertain.
C) Electric pulp tester: Can confirm but is more complex for routine use.
D) Probing: Tests periodontal nerve fibers — not pulpal anesthesia. Not appropriate before beginning.
The most objective clinical method to verify pulp anesthesia is the cold test (negative response = profound anesthesia). This tests the actual sensory nerve blockade rather than relying on subjective patient report. For inferior alveolar nerve blocks, additional methods include lip numbness (soft tissue sign) but this doesn't confirm pulpal anesthesia.
A) Asking the patient: Subjective — patients may report feeling numb even with incomplete pulpal anesthesia, or may be anxious and uncertain.
C) Electric pulp tester: Can confirm but is more complex for routine use.
D) Probing: Tests periodontal nerve fibers — not pulpal anesthesia. Not appropriate before beginning.