Surgical mask filter and fit performance

摘要: Background Surgical masks have been used since the early 1900s to minimize infection of surgical wounds from wearer-generated bacteria. There is ongoing debate, however, whether can meet expectations respiratory protection devices. The goal this study was evaluate filter performance and facial fit a sample masks. Methods Filter penetration measured for at least 3 replicates 9 using monodisperse latex sphere aerosols (0.895, 2.0, 3.1 μm) 6 L/min 0.075-μm sodium chloride particles 84 L/min. Facial on 20 subjects 5 with lowest particle penetration, both qualitative quantitative tests. Results Masks typically in dental settings collected significantly lower efficiency than those hospital settings. All failed unassisted test first exercise (normal breathing). Eighteen assisted tests; 60% exercise. Quantitative factors ranged 2.5 9.6. Conclusion None these exhibited adequate characteristics be considered