Characterization of airborne particles from irreversible hydrocolloids.

Airborne particles of irreversible hydrocolloid powders were monitored and characterized. Ten to fifteen percent of the particles were siliceous fibers with dimensions of less than 3mum in diameter and more than 20mum in length. These dimensions conform closely to the dimensions of the fibrogenic and carcinogenic fibres of asbestos, glass, and aluminum oxide. With almost daily utilization of irreversible hydrocolloid materials in the dental office, the improper handling of the materials could be hazardous to the health of dental personnel. It is recommended that inhalation of aerosols arising from irreversible hydrocolloid powders be avoided.