key: cord-0801022-z14fkz0x
authors: Swennen, G.R.J.; Haers, P.E.
title: Reply to Letter to the Editor “Comfort and compliance with the use of facemasks during COVID-19 infection”
date: 2020-07-07
journal: Int J Oral Maxillofac Surg
DOI: 10.1016/j.ijom.2020.06.018
sha: de873cbd63a6002d13537c290fdd1e5d5ca592f7
doc_id: 801022
cord_uid: z14fkz0x

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filter holder 1 . This could be done with calibrated tests used by regulatory bodies to approve the safety of masks used in industrial or clinical circumstances. The fit of the mask could be tested on the person for whom it was made and/or on a threedimensional (3D) print of that face. The filter mentioned in the article has a CE mark and is approved for use.

Only when this has been approved could one use the mask for a trial in clinical circumstances to verify comfort and any arising dermatological issues.

The mask has a rigid contour and as such does not adapt to facial expressions.

However, we are currently testing a third disposable component consisting of a removable malleable edge along the contour of the mask to adapt to facial expressions and improve comfort.

The thickness of the mask is partially related to the material used, which is not porous and can be disinfected. Obviously further refinements can be made.

The article does not mention face shields, as this was a proof-of-concept study on the mask itself. Of course, the custom-made 3D printed mask could be combined with commercially available or self-made face shields.

Obviously it will be interesting to see reports in the future on the validity of using 3D imaging as the sole source for printing reusable custom-made 3D printed masks and how this principle can evolve in the future.

Custom-made 3D-printed face masks in case of pandemic crisis situations with a lack of commercially available FFP2/3 masks

Author G. R. J. Swennen has a potential conflict of interest having a minor stock ownership in 3D Infinity. P. E. Haers has no conflict of interest to declare.J o u r n a l P r e -p r o o f