Department of Orthodontics, The School of Dentistry, Institute of Clinical Sciences, College of Medical and Dental Sciences, University of Birmingham, 5 Mill Pool Way, Birmingham, B5 7EG, UK.
Discipline of Orthodontics, Faculty of Dentistry, The University of Hong Kong, Pok Fu Lam, Hong Kong SAR, China.
Sci Rep. 2024 Nov 19;14(1):28683. doi: 10.1038/s41598-024-80001-4.
A reported 20% of dental staff will fail their fit test for a disposable FFP3 respirator. This needs to be factored into future pandemic workforce and PPE supply planning. At present there are no scientifically or universally accepted facial shape criteria to design and produce facial masks that will fit the entire work force. This study presents differences in facial shape, volume and surface area between individuals who passed on several FFP3 masks (pass group) and participants who passed on only one FFP3 mask (fail group). Three dimensional images of 50 individuals, 25 in each group, were taken at rest and at maximum smile using a DI4D SNAP 6200 camera system. The images were processed, and four "average faces" were produced-pass group at rest, fail group at rest, pass group at maximum smile and fail group at maximum smile. Simple Euclidian linear and angular measurements, geodesic surface distances and volume and surface area enclosed within the mask were analysed. The results of the study show that individuals who are more likely to pass a mask fit test have longer faces, wider mouths, greater geodesic surface distances and a greater volume and surface area of soft tissue enclosed within the mask boundary. This would suggest that some manufactures masks may be too large, and they need to reduce the size of their masks or produce a category of sizes, accepting the fact that one size does not fit all.
据报道，20%的牙科工作人员在一次性 FFP3 呼吸器的适合性测试中失败。这需要纳入未来大流行期间的劳动力和个人防护装备供应计划。目前，没有科学或普遍接受的面部形状标准来设计和生产适合整个劳动力的面罩。本研究比较了通过几个 FFP3 口罩（通过组）和仅通过一个 FFP3 口罩（失败组）的个体之间的面部形状、体积和表面积的差异。使用 DI4D SNAP 6200 相机系统，对 50 名个体的三维图像进行拍摄，每组 25 名，在休息和最大微笑时拍摄。对图像进行处理，生成四个“平均面孔”-休息时的通过组、休息时的失败组、最大微笑时的通过组和最大微笑时的失败组。分析了简单的欧几里得线性和角度测量、测地线表面距离以及面罩内封闭的软组织体积和表面积。研究结果表明，更有可能通过口罩适合性测试的个体具有更长的脸、更宽的嘴、更大的测地线表面距离以及更大的软组织体积和表面积封闭在口罩边界内。这表明一些制造商的口罩可能太大了，他们需要减小口罩的尺寸或生产一系列尺寸，接受一个尺寸不适合所有人的事实。
