| small fissures extending apically from the midline of the gingival margin in teeth subjected to trauma. Although these clefts may be found in traumatism, they are not necessarily diagnostic of occlusal trauma; a cleft of the marginal gingiva; may be caused by many factors, such as incorrect toothbrushing, a breakthrough to the surface of pocket formation, or faulty tooth positions, and may resemble a V-shaped notch. |