Activate regeneration! perFORM Collagen Membranes have a permeable bilayer. The layers contain highly purified collagen fibers. On the smooth side, densely packed collagen bundles prevent ingrowth of epithelial cells into the repair site. The rough side has loosely packed collagen fibers to support new bone growth. The perFORM membrane is fully resorbable with sufficient time for osteogenesis to occur and requires no second surgery to remove.