Pediatric Dentistry · patient case question
At a later visit nitrous oxide is planned, but the mother reveals the child ate a full meal shortly before arriving. What should be done?
Patient case: Uncooperative child with a disruptive parent
Patient: Male, 5 years old
Chief Complaint: Brought by his mother for restorative treatment of two carious primary molars.
Background: First dental visit was traumatic. He has since refused to open his mouth at two consecutive appointments.
Current Findings: Frankl behaviour rating 4 (definitely negative) — he cries loudly, refuses examination and will not sit in the chair. His mother repeatedly interrupts, contradicts the explanations being given, and speaks harshly to both the child and the dental team.
Show answer and explanation
Correct answer: B. Explain the risks to the mother and proceed only if she consents after being informed
- A. Proceeding without disclosure bypasses informed consent, whatever the actual level of risk.
- B. A recent meal raises the risk of nausea and vomiting under nitrous oxide, and vomiting in a partially sedated child carries an aspiration risk. The proper course is to disclose that risk to the parent, discuss the alternatives, and let her make an informed decision. Nitrous oxide is minimal sedation with preserved protective airway reflexes, so proceeding after informed consent is defensible — but the disclosure is not optional.
- C. Rescheduling may well be the outcome, but it should follow the conversation rather than replace it. The parent is entitled to the information and the choice.
- D. Substituting a deeper level of sedation makes an aspiration risk WORSE, not better, and requires stricter fasting.
Note: AAPD guidance: light fasting is preferred before nitrous oxide precisely because nausea and vomiting are the commonest adverse effects. Deeper levels of sedation require full NPO status — generally 2 hours for clear liquids and 6 hours for a light meal.
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