Atlas of Foreign Materials
A sponge manufactured of polyvinyl alcohol foam. It is used in many medical specialties. In the head and neck area, it is often used as a wound dressing. It is marketed as Hydrofera.
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PVA sponge 2x
PVA sponge 4x
PVA sponge 10x
PVA sponge 40x
Images courtesy of Tufts University School of Dentistry