OBJECTIVETo evaluate the outcome of alveolar cleft bone grafting using dental 3D-CT, and identify the position of the bone bridge.

METHODSEighteen unilateral complete alveolar cleft patients were chosen in this study and using dental 3D-CT to evaluate the position of the bone bridge after thee month bone graft. The alveolar cleft was divided at several section, the bone bridge position were checked, and the position of graft bone bridge were calculated.

RESULTSIn mesial and distal direction, there was no difference between mesial and distal bone bridge (P > 0.05). In labial and palatal direction, labial bone bridge was more than palatal bone bridge (P < 0.001). In venial direction, bone bridge which at one third of apical root and middle root of the central incisor root, was more than bone bridge which at alveolar crest and nasal base.

CONCLUSIONAfter secondary alveolar bone graft, bone bridge in alveolar cleft position is most located at labial and apical third and middle third of the central incisor root.