Assessment of secondary alveolar bone grafting using a modification of the Bergland grading system.

Although the management of the alveolar cleft remains controversial secondary alveolar bone grafting is the most widely accepted approach. The results of a series of 71 secondary alveolar bone grafts performed between 1990 and 2001 on 58 patients with complete cleft lip and palate 13 of which were bilateral are presented. Bone grafts were assessed when the canine tooth had fully erupted using periapical dental radiographs.The occlusal level of the newly obtained interdental bone of each grafted cleft was recorded and categorised in accordance with the Oslo grading system as described by Bergland. In addition the basal level of each bone graft was recorded. In this way total bone graft height was measured and each graft was categorised with respect to the desired normal height of noncleft interdental alveolar bone. This modified analysis grades more precisely the efficacy of secondary alveolar bone grafting and helps to identify and categorise those patients with insufficient bone for dental, orthodontic and orthognathic rehabilitation and those who may require further investigation and regrafting.