Functional Appliance Can Improve The TMJ Disk Displacement

To measure the positional changes of TMJ disk and condylar with insertion of functional appliance using MRI for further understanding therapy mechanisms. Twenty-three patients (23.2±4.7 years old) with disc displacement were selected. These patients were treated in the Orthodontics Department, the First Medical center of PLA General Hospital in BeiJing from September 2022 to June 2024. All the patients were treated with functional appliance for 3 to 6 months. During the treatment, patients underwent specialist temporomandibular joint examination of MRI. SPSS V22.0 software was used to conduct paired t-test on the measured values before and after treatment, Evaluate the treatment effect of the functional appliances on the disc displacement comprehensively. ①After treatment, 89.4% of the clicking symptoms were relieved,89.1% of the pain was eliminated,76.2% of the mouth opening deviation degree was reduced. Normal movement of condylar accounts for 82.7% in ADDR. 92.1% of ADDR with joint effusion had no effusion after treatment. ②The disc-condylar angle and disc-condylar distance were reduced after treatment effectively. The rate of disk reposition in ADDR was greater than 80%, and in ADDwoR was greater than 40%. ①The functional appliance can improve the disc displacement, joint clicking, reduce the joint effusion effectively, and promote regeneration for early condylar absorption. ②The results of MRI analysis have shown that the functional appliance can significantly improve the structural disorder of TMJ. The treatment effect to ADDR of disc displacement is better than to ADDwoR.