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Document ID (ISN)67086
CIS number 96-1411
ISSN - Serial title 0002-8894 - American Industrial Hygiene Association Journal
Year 1996
Convention or series no.
Author(s) Crouch K.G., Johnston O.E.
Title Nitrous oxide control in the dental operatory: Auxiliary exhaust and mask leakage, design, and scavenging flow rate as factors
Bibliographic information Mar. 1996, Vol.57, No.3, p.272-278. Illus. 19 ref.
Abstract Local exhaust systems installed in a dental surgery failed to control patient mouth emissions of nitrous oxide. Laboratory testing on a head form, in conjunction with the surgery observations, established that mask leakage due to poor fit was the primary cause of these emissions. An improved mask fit and the addition of a slotted skirt around the outer mask shell individually resulted in greatly reduced leakage rates in the laboratory tests. Also, exhaust systems placed on the chin, on the chest or in the mouth proved effective in capturing mouth emissions simulated by a breathing machine and head form.
Descriptors (primary) nitrous oxide; dental services; respirators; exhaust ventilation
Descriptors (secondary) local exhaust; gas removing respirators
Document type D - Periodical articles
Country / State or ProvinceUSA
Subject(s) Commerce, services, offices
Broad subject area(s) Chemical safety
Browse category(ies) Respiratory protection
Health care services
Inorganic substances
Ventilation