Correlation of Cephalometric Measurements of TMJ on CBCT and MR Images in patients with Traumatic TMJ sequelae

Abstract

Objective: To identify and measure spatial relationship of condyle using cephalometric method on Cone Beam Computed Tomography (CBCT) in patients with Temporomandibular Joint traumatism and to correlate it with Magnetic Resonance (MR) imaging findings. Methods: 34 patients (61 TMJs) were included with the complaint of Temporomandibular Joint Disorders (TMJDs) along with historic reference of traumatism to the part of the mandible or joint. Anteroposterior Relationship (in %) of total of 61 joints on CBCT were divided into four groups: Group I- <46%, Group II - 46-53%, Group III – 54-58%, Group IV - >59% and were corelated with MR imaging findings. Statistical tests employed were Fischer’s exa ct test a nd the Chi-square test. Results: Group II followed by group III demonstrated high frequency of deformed disc in open and closed mouth, disc displacement, marrow edema and effusion. Conclusion: Statistical evidence does not support any correlation between the anteroposterior relationship of condyle in the fossa on CBCT and any of the MRI variables. However, the results of this investigation confirm that in patients with traumatic TMJ sequelae presented with altered spatial relationship of the condyle within the fossa and MR Imaging indications of internal derangement.