Abstract: Objective　To explore the value of condylar volume analysis based on cone beam CT(CBCT) in the measurement of the temporomandibular joint (TMJ) morphology of patients with condylar fractures. Methods　From January 2017 to May 2019, 28 patients with condylar fracture were enrolled. CBCT images were analyzed. Preoperative and postoperative TMJ bone morphology indexes (left condyle volume and right condyle volume) were compared between the fractured side and the non-fractured side. Results　The condylar volume on affected side after fracture operation was larger than that on non-affected side (P<0.05), and the condylar volume was reduced after surgery (P<0.05). Conclusion　The changes of condylar volume of patients with condylar fractures before and after surgery have significant difference between the fractured side and the non-fractured side. This may be a new standard for postoperative TMJ functional evaluation.

Key words: CBCT, 　Condylar volume, 　Condylar fracture, 　Temporomandibular joint