Analysis of the Correlation between Morphology and Kinematics of Anteriorly Displaced TMJ Discs Using Cine-MRI and ARCUSdigma Systems

Abstract

Background: Studies of mandibular movement trajectories have provided a good understanding of the motion of the condyle but little information on the geometric relationships of the disc because they have not related the movements to anatomic structures. Objective: This study investigated the morphology and kinematic characteristics of the Temporomandibular Joint (TMJ) using Cine-MRI and ARCUSdigma systems. Methods: For this study population, preliminary clinical diagnoses were asymptomatic in 15 cases, unilateral anterior disc displacement with reduction (ADDWR) in 17 cases, and unilateral Anterior Disc Displacement Without Reduction (ADDWoR) in 14 cases. Patients were investigated with Cine-MRI and ARCUSdigma systems during physiological opening and closing of the mouth. Results: In these groups, there were 13 healthy subjects, 19 patients with unilateral ADDWR and 14 patients with unilateral ADDWoR classified by Cine-MRI. (1) To assess morphology by MRI, disc deformities were evaluated as follows: biplanar, rounded, thickening in the posterior band, lengthened and folded. (2) The opening trajectory for healthy subjects was close to the closing trajectory. Conversely, the incisal and condylar trajectories during opening and closing were obviously bounced, deviated or shortened in the ADDWR and ADDWoR groups. The pathway of the kinematic axis was not parallel, and the condylar trajectory had an inflexion. (3) The mean values of the incisal and condylar paths of the ADDWoR group were significantly different from those in the healthy group (P<0.05), whereas there were no significant differences between the ADDWR and the healthy group (P>0.05). Conclusion: This study combined analysis of the condylar pathways and disc-condylar relationship to provide good visualization of morphology and kinematics during jaw movement. This process helps improve our understanding of the complexity of disk-condylar movements in subjects with TMJ internal derangement and may also contribute to our knowledge of the etiology of TMJ internal derangement.

Correlation of Temporomandibular Joint Sound Cases With Direction of Jaw Movement Deviation: A Study of Data Survey at Unsyiah Dental Hospital, Aceh-Indonesia

“…The most visible TMD disorders in the form of joint sounds in the age range 17-25 years and 36-45 years, amounting to 28%. This age is an age that is susceptible to interference, because it is considered productive age compared to old age, in which the joints have begun to adapt to the disorders that occur [23,26,27].…”

“…however, their study was limited to show a correlation between deviation and joint sound, but did not show the direction of the deviation. therefore this study will be something that might be a reference in the diagnosis of TMD because from the available literature no one has discussed it yet [26,27].…”

Association Between Kinematic Center and Anatomy, The Function of Temporomandibular Joint

“…The median distance in middle that Kinematics Center and that point of exact condyl axis's was measured using data belong to the every joint and the 95 percent of interval confidential that value was calculated. (13) The associated craniocaudal coordinates XZmax and XHmax, as well as the largest opening and closing path differences Zmax and Hmax, were averaged intra-individually over the observed opening and closing cycles. To investigate whether Zmax and Hmax differed, we used Wilcoxon tests with a 0.05 significance level.…”

Biomechanical behaviour of temporomandibular joints during opening and closing of the mouth: A 3D finite element analysis

“…Previous studies have focused on recording kinematic trajectories by a variety of approaches 7,8 such as dynamic magnetic resonance imagining (MRI). Dynamic MRI produces an accurate and intuitive view for capturing the motion of TMJs, 9,10 but the frequency is too low. Electronic-magnetic motion analysis systems can depict the trajectories of designated points, including the middle of condyles and lower incisor points during a motion, 11,12 but all test subjects share the same condylar distance, which disagrees with reality.…”