Pediatric Dentistry · patient case with 1 question
8-year-old with a history of lip biting after treatment
Scenario: An 8-year-old boy needs a restoration on tooth #T. He has a PREVIOUS HISTORY OF LIP BITING after treatment. Which anaesthetic technique is more effective and appropriate?
Question 1
Which anesthetic approach is most appropriate?
Show answer and explanation
Correct answer: A. 3% mepivacaine (Carbocaine) plain by infiltration
- A. Correct. 3% MEPIVACAINE PLAIN has NO vasoconstrictor and therefore the SHORTEST soft-tissue duration of the common dental anaesthetics — roughly 2-3 hours of soft tissue numbness rather than 3-5 hours. Combined with an INFILTRATION rather than a block, this minimises the duration and extent of lip and tongue numbness in a child with a documented self-injury history.
- B. A conventional block with lidocaine and epinephrine produces the LONGEST soft-tissue anaesthesia — precisely the scenario that led to the previous lip biting.
- C. Bupivacaine is a LONG-acting agent (up to 8-12 hours of soft tissue anaesthesia) and is contraindicated in young children for exactly this reason.
- D. A long buccal block anaesthetises buccal soft tissue only and would not provide pulpal anaesthesia for the restoration.
Note: Also consider PHENTOLAMINE MESYLATE (OraVerse) to reverse soft-tissue anaesthesia — though it is not indicated under age 3 or under 15 kg. And always counsel the parent explicitly about lip, cheek and tongue biting before the child leaves.