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TEXT VERSION OF SLIDE: Title: Chronic Silicosis Type: Text Slide Content: Little respiratory impairment in early stages Significant chest X-ray changes usually after 15 to 20 years of exposure Speaker Notes: Three forms of the disease have been described. Chronic silicosis usually takes 20 to 45 years to develop. Dust concentrations of 10% silica or even less are often capable of producing silicosis. Usually the early stages of chronic, or simple, silicosis produce little or no respiratory impairment. Although early chest X-rays changes may sometimes be noted, significant changes may not be seen until after 15 to 20 years of exposure.