Failure of nitrous oxide and oxygen pin-indexing.
D000766:Anesthesia, Dental / Q000295:instrumentation*; D000768:Anesthesia, General / Q000295:instrumentation*; D006801:Humans; D009609:Nitrous Oxide / Q000008:administration & dosage; D010100:Oxygen / Q000008:administration & dosage
D009609:Nitrous Oxide; D010100:Oxygen