title: The effect of leaving dentures in place on bag-mask ventilation at induction of general anesthesia.
abstract: BACKGROUND
  The optimum timing for denture removal in edentulous patients before anesthesia and surgery is uncertain.
  
  
  METHODS
  We conducted a prospective, randomized, controlled trial to evaluate the effect of leaving dentures in during bag-mask ventilation at induction of general anesthesia. One hundred sixty-six edentulous patients were randomized to two groups. The Dentures-In group was bag-mask ventilated after induction of anesthesia with dentures left in place. The Dentures-Out group patients had their dentures removed before bag-mask ventilation. The degree of difficulty of bag-mask ventilation was assessed by the anesthesiologist.
  
  
  RESULTS
  Successful bag-mask ventilation, as defined by a increase in ETco(2) to 20 mm Hg and back to baseline with 3 L/min fresh gas flow and the adjustable pressure limiting valve at 20 cm H(2)O, was achieved in 61 of 84 (73%) of the Dentures-In patients compared with 40 of 81 (49%) of the Dentures-Out patients (odds ratio 0.37, 95% CI = 0.19-0.70, P = 0.002).
  
  
  CONCLUSIONS
  We conclude that bag-mask ventilation is easier in edentulate patients when their dentures are left in situ during induction of general anesthesia.
authors.affiliation: Department of Anesthesia, Dunedin Hospital, Dunedin, New Zealand.
authors.forename: Niamh P
authors.initials: NP
authors.lastname: Conlon
authors.forename: Richard P
authors.initials: RP
authors.lastname: Sullivan
authors.forename: Peter G
authors.initials: PG
authors.lastname: Herbison
authors.forename: Mathew
authors.initials: M
authors.lastname: Zacharias
authors.forename: Donal J
authors.initials: DJ
authors.lastname: Buggy
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000768:Anesthesia, General / Q000295:instrumentation / Q000379:methods*; D003778:Dentures; D005260:Female; D006801:Humans; D008297:Male; D008397:Masks; D008875:Middle Aged; D011446:Prospective Studies; D012121:Respiration, Artificial / Q000295:instrumentation / Q000379:methods*