[Dental surfaces in workers exposed to fluorides]

Imprint preparations were taken by Eifinger's method from the labial surfaces of upper incisors from 65 workers working at least since 10 years at the production of phosphate fertilizers, and from 33 subjects without occupational exposure to any industrial harmful agents, at least in the last 10 years. Differences were noted in the dental imprints in subjects exposed to fluorides in relation to controls in microscopic examinations.