Assessment of Disclusion Time and Occlusal Force Distribution in the Iraqi Patients with TMJ Internal Derangement Using T-Scan
Objective: Is to evaluate the effects of occlusal instability (disclusion time in the lateral and protrusive mandibular movement and the occlusal forces distribution) in Iraqi patients with intraarticular joint disorder (disc displacement) in the temporomandibular joints using the T-Scan NOVUS digital occlusal analysis system. Materials and Methods: case-control study design. Subjects of both genders (>19 years old) were selected for both patients and control according to the inclusion criteria; subjects should have full dentition with angle class I relation. Patients with TMJ disc displacement (internal derangement) were diagnosed according to DC/TMD. Digital occlusal evaluation of the occlusal parameters; disclusion time and occlusal force was performed using the T-Scan 10 (NOVUS) for both patients and control group. Results: One hundred and nine (109) subjects were participated in this study with age range (19-45 years old) and divided into two main groups: (84) patients TMD group with signs and symptoms of intraarticular joint disorders and (25) healthy control free from signs and symptoms of TMD. Significant prolonged disclusion time at (p=0.004) and asymmetry of occlusal forces at (p=0.03) were registered in the right lateral side of the mandibular movement in TMD patients in comparison to control. Conclusion: Prolonged disclusion time with the asymmetry of occlusal forces in Iraqi patients with TMJ internal derangement in the lateral excursive mandibular movement.