Chronic laryngitis in glassblowers.

Glassblowers are exposed to numerous physical and chemical noxious factors at their workplace. Mucosal layer of upper aerodigestive tract (nose, oral cavity, pharynx and larynx) is particularly vulnerable to the influence of these factors. Inhalation of hot gases, dust particles, and oral contact with glassblower's pipe are the most important factors that can cause chronic inflammation of the upper respiratory tract. The aim of this study was to examine the prevalence of chronic laryngitis in the group of glassblowers and control group of workers and to examine whether the observed differences depend on the membership in these two groups, on the duration of exposure, or on both factors. The results of the study show significantly higher prevalence of chronic laryngitis among glassblowers than among control group of workers employed in the same plant. On the other hand, the duration of exposure was not statistically significant factor for chronic laryngitis. The exposure to risk factors on the working place represents an independent risk factor for the occurrence of chronic laryngitis among glassblowers, when adjusted for other possible confounders, such as age, years of service, smoking habits and alcohol consumption.