Dynamic Facial Dimensions in Design of Respirator: A Pilot Study

To involves dynamic facial movement into anthropometry, enhancing facial product design like respirator, this pilot study explored the dynamic dimensions and variations in facial dimensions under different movements in Chinses population. Using 3dMDface™ System, facial data were collected from 16 participants performing 9 movements that are required in respirator fitting test. This study manually selected 21 landmarks and calculated the Euclidean distances for 12 dimensions that related to the respirator design. Results revealed that longitudinal facial dimensions exhibited the largest variations, with facial length ranging from 116.0 mm to 192.4 mm (variation of 76.4 mm). In contrast, frontal dimensions showed smaller variations. Minimal variations were observed in inner upper face. Open mouth, grimacing and cough resulted in the greatest changes in facial dimensions. These findings highlight the importance of considering dynamic facial changes when designing masks or respirators, particularly by incorporating flexible features to accommodate facial elongation caused by jaw movements