Gingival Recessions: Definition and Classification
In the normal situation, the gingival margin draws a scalloped line located 1 or 2 mm coronally to the cementoenamel junction (CEJ) . Gingival recession is a mucogingival defect referred to the buccal exposure of the root surface of the tooth as a consequence of an apical migration of the gingival margin up to the CEJ [2, 3]. This pathological process involves both gingiva and the underlying bone. Thus, bone dehiscence should be present for gingival recession to occur (intrinsic mechanism) . In some situations, the gingival relapse could slightly expose underling bone. This situation could explain the extrinsic pathological mechanism of gingival recession .