Prevention of flap Necrosis
Flap necrosis can be prevented if the eon a ends to four basic principles. First, the apex (tip of a flap should never be wider than the base, unless a major artery is present in the base. Flaps should have sides hat either run par-
allel to each other or, preferably, converge ‘moving from the base to the apex of the flap. Second, generally’ the length of a flap should be no more than twice the width of . the base (Fig. 3-2, A-C). Strict adherence to this principle is , less critical in the oral cavity, but in this location the
length of the flap should never exceed the width. Third, when possible, an axial blood supply should be included in the base of the nap. For example, a flap in’ the palate should be based toward the greater palatine artery (see Fig. 3-2). Fourth, the base of flaps should not be excessively twisted, stretched, or grasped with anything that might damage vessels, because these maneuvers can compromise the blood supply feeding and draining the flap.