Surgical intervention in the treatment of periodontal conditions, aimed primarily at regenerating lost periodontal tissue rather than resecting diseased tissue. The excisional new attachment procedure (ENAP) is the surgical removal of the diseased pocket epithelium. Periodontal flap surgery involves incisions made in the gingiva around the necks of the teeth with the elevation of a flap, including the underlying soft tissues, to expose the supporting alveolar bone; the flap provides access to the underlying tissues. The flap is sutured into position post-operatively and usually covered by a protective pack. Gingivectomy involves the excision and removal of some of the gingival tissue. Gingival curettage is a procedure that involves an attempt to scrape away the lining of the periodontal pocket using a curette.