Anesthesia · single question
For a child with a history of lip biting during a previous appointment, what local anesthesia technique should be used at the NEXT appointment to prevent this from occurring again?
Show answer and explanation
Correct answer: C. Local infiltration with 3% carbocaine (mepivacaine)
3% Carbocaine (mepivacaine) without vasoconstrictor is the preferred anesthetic for preventing post-anesthetic lip/cheek biting in children. Mepivacaine without epinephrine has a significantly shorter duration of soft tissue anesthesia (~1.5–2 hours vs. 3–5 hours with epinephrine-containing solutions), reducing the at-risk window for self-inflicted trauma. An infiltration technique (rather than a nerve block) also has shorter duration. Additionally, articaine 4% with epinephrine can sometimes replace a nerve block with a buccal infiltration for shorter duration in mandibular molars.
- A. ❌ Topical anesthesia alone would not provide adequate pulpal/soft tissue anesthesia for restorative procedures.
- B. ❌ General anesthesia is not indicated just to prevent lip biting — disproportionate to the risk.
- C. ✅ CORRECT – 3% carbocaine (mepivacaine) without vasoconstrictor via infiltration provides shorter-duration soft tissue anesthesia, reducing lip bite risk.
- D. ❌ A nerve block provides longer duration anesthesia — more lip numbness time = more risk of self-trauma.