Biodegradable metals are a class of metal that when implanted will gradually degrade and be completely resorbed. The degradation products are then metabolized by the human body.

The NOVAMag® SHIELD has a smooth and shiny surface. Immediately upon implantation, the membrane begins to degrade. The degradation process creates a rough surface that improves the adhesion of the soft tissues.
As the magnesium metal degrades, magnesium salts and hydrogen gas are formed at the surface. The combination of the magnesium metal and the magnesium salts provide an effective barrier during the critical healing period. In some instances, hydrogen gas slightly tents the soft tissue above the NOVAMag® SHIELD, thereby providing as an additional barrier without affecting bone regeneration.

During the degradation of the magnesium metal, the metallic structure is transformed into magnesium salts and a small volume of hydrogen gas is released. A small accumulation of the gas may collect around each device and is visible in X-rays. The release of hydrogen gas might present as a slight swelling of the soft tissues.

The magnesium salts keep the original shape and position of the membrane until they are resorbed by the body, whereas the small volume of hydrogen gas initially provides a slight tenting of the soft tissue. Both of these degradation by-products continue to maintain a separation of the soft and hard tissues as a second phase to the barrier functionality of the membrane until they are resorbed by the body.

For instances of exposure, it is recommended that special care is taken for controlling oral hygiene, rinsing the area with e.g. CHX solutions, and avoiding acidic food and/or drink as well as smoking. No additional treatment measures for the soft tissue is required. Cases of small dehiscence should disappear after 2-3 weeks. There is no need for membrane removal in the case of localized exposure.
Upon exposure, the membrane can appear dark grey/ black in colour, which happens normally during the degradation process.