Objective: To test the accuracy and credibility of cone-beam computed tomography( CBCT)on measuring the height and volume of alveolar bone defects before periodontal regeneration surgery. By comparing the bone density measured by CBCT before and after the operation,the time to evaluate the efficacy of the periodontal regenerative surgery would be determined. Methods: Periodontal regenerative surgeries were performed on three-wall bone defects of ten teeth in nine patients. The height of bone defects was mea...