“…12 Several authors thought that this might explain the higher frequency of extrusion and foreign body reactions found after ePTFE augmentation in the perioral region, an area that is especially mobile. 13,14 Also Maas et al 15 in 1998, having performed studies in the porcine model, stated that limited fibrous tissue ingrowth into the surface of strips and cords, compared with tubular implants, did not provide enough stability for long-term augmentation in highly mobile regions, especially on the face. This work led to the development of ePTFE tubes marketed as Soft-Form (McGahn Medical, Santa Barbara, CA), which provide better stability of the implant due to tissue in-growth into the open ends of the lumen.…”