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Title

EXPOSURE TO METHYL METHACRYLATE AND ITS SUBJECTIVE SYMPTOMS AMONG DENTAL TECHNICIANS, TEHRAN-IRAN

Pages

 Start Page 33 | End Page 38

Keywords

METHYL METHACRYLATE (MMA)Q4
TIME- WEIGHTED AVERAGE (TWA) CONCENTRATIONQ4

Abstract

 Background and Aims: 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 MMA and to assess their health with a focus on respiratory and dermal symptoms. Method: 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 was evaluated gravimetrically. HEALTH SYMPTOMS were asked using a questionnaire. Results: The TWA for technicians with direct and indirect exposure to MMA were 327.28 + 79.42 and 282.9 + 41.84 mg/m3, respectively. PEAK CONCENTRATION of MMA for those technicians was 337.0 + 36.81 and 328.88 + 45.40 mg/m3, respectively. There were no significant differences between TWA of MMA and PEAK CONCENTRATION in different weakly workdays; low ever, within - day variations were observed (P<0.05). TWA of 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). Conclusion: 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.

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