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High‐volume aspiration as a supplemental scavenging method for reducing ambient nitrous oxide levels in the operatory: a laboratory study
Author(s) -
HENRY ROBERT J.,
BORGANELLI GREGORY N.
Publication year - 1995
Publication title -
international journal of paediatric dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.183
H-Index - 62
eISSN - 1365-263X
pISSN - 0960-7439
DOI - 10.1111/j.1365-263x.1995.tb00299.x
Subject(s) - aspirator , medicine , ventilation (architecture) , nitrous oxide , volume (thermodynamics) , anesthesia , toxicology , mechanical engineering , physics , quantum mechanics , biology , engineering , thermodynamics
Summary. Occupational exposure to low levels of nitrous oxide N 2 O have been associated with adverse health effects. The National Institute for Occupational Safety and Health has established a threshold guideline of 25 ppm N 2 O. The purpose of this laboratory study was to determine the effectiveness of a high‐volume dental aspirator as a supplemental device to reduce ambient N 2 O levels in the operatory. The investigation evaluated four experimental groups that were assigned based on whether or not the aspirator was used and on the rate at which operatory ventilation was established (5 or 10 room air exchanges per hour). Ambient N 2 O levels were monitored at 30 cm from the nasal hood using an infrared spectrophotometer. The room air exchange rate was measured with a flow hood and then manipulated to the desired ventilation rate. N 2 O levels were detected with a spectrophotometer and data were recorded with a microprocessor that continuously collected data. The results demonstrated that both utilization of supplemental oral aspiration and increased operatory ventilation significantly reduced ambient N 2 O levels. It was concluded that a high‐volume aspirator, when used in conjunction with the normal scavenging system, can significantly reduce ambient N 2 O levels to within the guidelines established by the National Institute for Occupational Safety and Health.