Periapical radiographic images of autogenous bone grafts according to the Chelsea classification. (a) Type A: the presence of bone tissue at the cementoenamel junction of the teeth adjacent to the cleft and at least 75% of both roots covered by bone. (b) Type B: the presence of bone tissue at the cementoenamel junction of the teeth adjacent to the cleft and at least 25% of both roots covered by bone. (c) Type C: the presence of bone tissue surrounding at least 75% of the roots in the cleft area with an apical direction. (d) Type D: the presence of bone tissue surrounding at least 50% of both roots in the cleft area, with an apical to coronal direction. (e) Type F: the presence of 25% or less of bone tissue in both roots in the apical direction.