Abstract: Objective: To investigate the clinical value of cone beam compted tomography(CBCT) in the diagnosis of mandibular tumors and tumor-like lesions. Methods: CBCT images from 16 cases who suffered from mandibular tumor or tumor-like lesions were studied,including axial,coronal, sagittal,curved planes and volume rendering images of the lesions.The dimension,shape and internal structure of the lesions were observed, the anatomic relationship between the lesions and closed teeth, mandibular canal were analyzed,and verified during the operation. Results: Of the 16 cases of mandibular tumor and tumor-like lesions, 6 cases were odontoma, 3 cases were ameloblastoma, 3 cases were keratocyst, 2 cases were ossifying fibroma, 2 cases were fibrous dysplasia. The dimension, shape and internal structure of all the lesions and the impact with the closed teeth, mandibular canal were displayed distinctly, there were no different during the operations. Conclusion: CBCT can support completely image information of mandibular tumor and tumor-like lesions and can be a routine examination before operation.

Key words: CBCT, Mandibular tumor , Tumor-like lesions, Diagnosis