RT Book, Section
A1 Levin, Stephen
A1 Lilis, Ruth
A2 Wallace, Robert B.
SR Print(0)
ID 1141969051
T1 Silicosis
T2 Maxcy-Rosenau-Last Public Health and Preventive Medicine, 15e
YR 2017
FD 2017
PB McGraw-Hill Medical
PP New York, NY
SN 9780071441988
LK accessbiomedicalscience.mhmedical.com/content.aspx?aid=1141969051
RD 2024/04/20
AB Silicosis  is  a  fibrotic  lung  disease  produced  by  the  inhalation  of  dust-containing  free  crystalline  silicon  dioxide  (SiO2).  Free  silica  and  silicates  represent  a  large  part  of  the  earth's  crust.  Silicon  and  oxygen  are  the  two  most  important  elements  in  the  crust;  about  27.7%  of  its  composition  is  silicon,  and  46.6%  is  oxygen.  Free  silica,  the  most  widespread  naturally  occurring  substance  known  to  have  a  fibrogenic  effect  on  the  lungs,  occurs  in  crystalline  and  amorphous  forms.  The  crystalline  forms  that  are  fibrogenic  are  quartz,  tridymite,  and  cristobalite;  cryptocrystalline  forms  (consisting  of  minute  crystals)  are  flint,  chert,  opal,  and  chalcedony.  There  are  numerous  forms  of  amorphous  silica.