A Study Of Temporomandibular Joint Internal Derangement With Magnetic Resonance Imaging

Objective: to determine the anterior and posterior border of articular disc and disc displacement in TMJ ID people and to explore its clinical application. Methods: The study comprised 34TMJs in 17 patients,who were assigned a clinical TMJ-related diagnosis of ID in at least one TMJ. Bilateral oblique sagittal of close mouth and open mouth and oblique coronal of close mouth MR images were obtained subsequently. Joints were studied in T1,T2 and PD weighted images and /or FSPGR series, were compared with those of 15(30TMJs) normal people. Results: two groups 64 sides joint equally to obtain limpid MR image,on oblique sagittal of close mouth T1 and PDW images showed that the anterior disc border in temporomadibular joint Internal Derangement (TMJ ID) people was sited around 0.42mm, before the vertical line of the lower end of articular eminence, while it is sited 0.14 mm, before the vertical line in normals, There exists significant statistical difference (t=2.615, p<0.05). The junction of posterior band of the disc and the bilaminar region in temporomadibular joint Internal Derangement people was sited at 14.4° of vertical line of condile center, but in normals it was 3.18° There exists significant statistical difference(t=3.077, p<0.05). Conclusion: MRI imaging and the temporomandibular joint coil optimally visualizes menicus positions, shapes and structures of correlate tissues, hence, can exactly diagnose the TMJ ID, The articular disc of TMJ ID people at oblique sagittal of...