title: [Silicosis and industrial bronchitis by exposure to silica powders and cement].
abstract: OBJECTIVE
  to identify the association between the exposure of workers to inorganic dust in a quarry and a cement factory and pulmonary diseases.
  
  
  METHODS
  a transverse study on data from 32 quarry workers (QWs) and 57 cement production line workers (CFWs) to inorganic-dust exposure was performed. Pulmonary function tests and chest X ray were done in both groups.
  
  
  RESULTS
  there were differences between QWs and the CFWs; QWs were younger, shorter and thinner. The number of sick individuals might be considered significantly different, showing a smaller proportion on the cement production line. The quarry workers have been on the company for a shorter period of time and, in the end, they present more serious pulmonary problems with an average of 3 years working.
  
  
  CONCLUSIONS
  the amount of free-silica that is managed on the quarry affects the workers in some way, even when literature states that the evolution of industrial bronchitis and silicosis have a period development of approximately 10 years.
authors.affiliation: Universidad Nacional Autónoma de México, Mexico City, Mexico. ramazzini.1700@gmail.com
authors.forename: María Martha
authors.initials: MM
authors.lastname: Méndez-Vargas
authors.forename: Fabiola Berenice
authors.initials: FB
authors.lastname: Báez-Revueltas
authors.forename: Pablo
authors.initials: P
authors.lastname: López-Rojas
authors.forename: José Horacio
authors.initials: JH
authors.lastname: Tovalín-Ahumada
authors.forename: José Othón
authors.initials: JO
authors.lastname: Zamudio-Lara
authors.forename: Irma Araceli
authors.initials: IA
authors.lastname: Marín-Cotoñieto
authors.forename: Francisco
authors.initials: F
authors.lastname: Villeda
mesh_terms: D000328:Adult; D001991:Bronchitis / Q000209:etiology*; D003252:Construction Materials / Q000009:adverse effects*; D003430:Cross-Sectional Studies; D004391:Dust; D006801:Humans; D008297:Male; D009784:Occupational Diseases / Q000139:chemically induced*; D016273:Occupational Exposure / Q000009:adverse effects*; D011208:Powders; D012189:Retrospective Studies; D012822:Silicon Dioxide / Q000009:adverse effects*; D012829:Silicosis / Q000209:etiology*
chemical_list: D004391:Dust; D011208:Powders; D012822:Silicon Dioxide
keywords: enfermedades profesionales; exposición profesional; occupational diseases; occupational exposure; pneumoconiosis; silicosis