fa مواجهه با متیل متا کریلات و علائم آن در تکنسین های پروتز دندان، تهران-ایران ایمنی Safety پژوهشي Research <p align="right">چکیده</p> <p> <strong> Background and aims </strong></p><p>  Methyl Methacrylate (MMA) which is known as a long, skin and eye  irritant is the most common form of acrylic plastic used in dental laboratories. The aims of this study were to evaluate dental technicians, exposure to MMAand to assess their health with a focus  on respiratory and dermal symptoms. </p><p> <strong> Methods </strong></p><p>  Exposure to MMA, total dust and health symptoms were investigated in 20 dental  laboratories located in Tehran, Iran. Time weighted average (TWA) of MMA and peak  concentrations were determined , using XAD-2 tubes followed by GC-ID analysis. Total dust  were evaluated gravimetrically. Health symptoms were asked using a questionnaire. </p><p> <strong> Results </strong></p><p>  The TWAfor technicians with direct and indirect exposure to MMAwere 327.28 + 79.42  and 282.9 + 41.84 mg/m3, respectively. Peak concentration of MMA for those technicians were  337.0 + 36.81 and 328.88 + 45.40 mg/m3, respectively. There were no significant differences  between TWAof MMAand peak concentration in different weakly workdays low ever, within -  day variations were observed (P<0.05). TWAof MMA and peak concentration correlation with  the laboratory volume were 0.61- 0.65, Dust exposure of technicians was 2.35 + 2.70 mg/m3. Cough and Skin dryness were the common health symptoms. Smoking and asbestos exposure history were factors influencing cough prevalence (P<0.005). </p><p> <strong> Conclusion </strong></p><p>  It is concluded that the current short - Term Exposure Limit (STEL) is not low enough to protect technicians against the adverse effects caused by MMA. </p><p>  </p> متیل متا کریلات( MMA ), تکنسین های پروتز دندان، لابراتورهای پروتز دندان، نشان های بهداشتی، میانگین زمانی تراکم (TWA)، تراکم پیک Methyl Methacrylate (MMA), dental technicians, dental laboratories , health symptoms, Time- weighted Average (TWA) Concentration, Peak Concentration 6 0 http://ioh.iums.ac.ir/browse.php?a_code=A-10-1-48&slc_lang=fa&sid=1 F. Golbabaei فریده گلبابایی 1360031947532846003112 1360031947532846003112 Yes دانشکده بهداشت دانشگاه علوم پزشکی تهران M. Mamdouh مریم ممدوح 1360031947532846003113 1360031947532846003113 No K. Nouri Jelyani کرامت نوری جلیانی 1360031947532846003114 1360031947532846003114 No دانشکده بهداشت دانشگاه علوم پزشکی تهران SJ. Shahtaheri سید جمال الدین شاه طاهری 1360031947532846003115 1360031947532846003115 No دانشکده بهداشت دانشگاه علوم پزشکی تهران