RT - Journal Article T1 - The Evaluation of Relationship between Spirometric Disorders and Methyl methacrylate in Dental Laboratories Personnel JF - umsha YR - 2010 JO - umsha VO - 17 IS - 1 UR - http://sjh.umsha.ac.ir/article-1-286-en.html SP - 31 EP - 38 K1 - Acrylic Resins K1 - Air Pollutants K1 - Occupational K1 - Laboratories K1 - Dental K1 - Spirometery AB - Introduction & Objective: Methyl methacrylate (MMA), as a monomer of acrylic resin that has a wide variety of usages in denture fabrication, is considered as an air pollution indicator in the laboratories. Occupational exposure to these compound vapors can cause respiratory hypersensitivity, occupational asthma, eye and skin irritation and Allergic Contact Dermatitis (ACD). Therefore control of MMA exposure may promote the personnel’s health. The aim of this study was to determine the relationship between spirometric disorders and methyl methacrylate in dental laboratories personnel. Materials & Methods: In this case control study, exposure of time-weighted average (TWA) and short-term exposure level (STEL) were measured with MMA vapors in 39 randomly selected male employee (case group) in 25 denture fabrication laboratories in Hamadan city. The air samples were collected by sorbent tubes containing chromosorb (XAD2( and analyzed by gas chromatograph equipped with FID detector based on NIOSH method. In addition 30 men whitout occupational exposure to air pollutants (control group) were selected to compare the variation of spirometric parameters. Spirometric parameters of the case and control groups such as FVC, FEV1, FEV1/FVC and FEF25-75 were measured by Vitalograph spirometer (model: 2120) on ATS method, after the standard questionnaire of respiratory diseases had been completed during an interview and medical examination. Results: The mean of MMA concentration was 132.87 ± 220.67 ppm for STEL and 1.95 ± 3.59 ppm for TWA.The relationship between MMA concentration in the STEL and TWA exposures was significant (P LA eng UL http://sjh.umsha.ac.ir/article-1-286-en.html M3 ER -