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Figure 9c. Photographs in a patient with a large periodontal pocket treated with an expanded polytetrafluoroethylene membrane and freeze-dried bone. (a) Soft tissue is retracted, exposing bone (arrowheads) and the periodontal pocket (straight arrows). Note the exposed root (curved arrow) caused by bone resorption. (b) The defect is packed with freeze-dried bone (arrowheads). (c) The membrane is placed over the bone graft, and the soft tissue is sutured closed to cover it. The edge of the membrane (arrowheads) is depicted between the bone graft and soft tissue. (Reprinted, with permission, from reference 17.)