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PubMedDate not supplied

[Determination of the shape of the contact line for protective glasses].

A contactless stereoscopic technique of determining the fitting line form for protective glasses is described. Twin stereoscopic images of human face and head are obtained, and based on these measurements the space coordinates of fitting line points are calculated. Mean statistic curves for 3 projections of the fitting lines obtained in the course of the examination of nearly 500 industrial, office and professional workers wearing protective glasses are presented.

Cephalometry↗
PubMedDate not supplied

The operating room and the ultraviolet environment.

Clean surgical wounds may be contaminated from three separate sources: endogenously from the patient himself; exogenously from direct contamination by unsterile instruments, drapes, gowns, hands, or gloves; and by bacteria settling from that final common pathway, the air over the operative field. The advent of total joint replacement precipitated a renewed consciousness in the orthopedic community of the disastrous consequences a wound infection can have upon the orthopedic patient. Deep infection around a total joint replacement can convert a procedure with a 95 percent probability of success to a total disaster, leaving the patient worse than prior to operation. Most orthopedists use at least two accepted methods of preventing deep wound infection in the postoperative period: the application of topical antibiotics during surgery, and the intravenous infusion of systemic antibiotics during and after surgery for a brief period. In addition, many orthopedic surgeons are operating in clean air rooms with body exhaust systems; others are operating in an ultraviolet environment. Orthopedic surgery in the ultraviolet environment has been used at the brigham hospitals since 1973. The infection rate has dropped from 3.8 percent to 1.04 percent in a series of 2000 patients. However, inconveniences and hazards have been experienced in the use of ultraviolet radiation in the operating room.

Air Microbiology↗
PubMed1982

Comparison of respirator protection factors measured by two quantitative fit test methods.

A comparison of measured respirator protection factors for a di-2-ethylhexyl phthalate (liquid aerosol challenge) respirator quantitative fit test method is made with a complementary sodium chloride (solid aerosol challenge) method. The United States Army XM-29 chemical warfare defense respirator was used in this evaluation. A subject pool of twelve individuals (two female and ten male) were fitted and tested on both respirator quantitative fit test methods on ten different occasions. An exercise protocol of six different breathing and head movement maneuvers was used in each test. The purpose of the comparison was to determine if there is a difference between the two fit test methods. The di-2-ethylhexyl phthalate method showed a significant order-interaction effect with respect to the exercise sequence and whether it preceded or followed testing with sodium chloride. The sodium chloride method did not show a similar phenomenon, and consistently measured smaller protection factors compared to the di-2-ethylhexyl phthalate method. It appears that the sodium chloride method is more sensitive.

Chemical Warfare↗