Computed tomography assessment of temporomandibular joint position and dimensions in patients with class II division 1 and division 2 malocclusions

Abstract

BackgroundThis study aimed to investigate and compare the positions and dimensions of the temporomandibular joint and its components, respectively, in patients with Class II division 1 and division 2 malocclusions.Material and MethodsComputed tomography images of 14 patients with Class II division 1 and 14 patients with Class II division 2 malocclusion were included with a mean age of 11.4 ± 1.2 years. The following temporomandibular joint measurements were made with OsiriX medical imaging software program. From the sagittal images, the anterior, superior, and posterior joint spaces and the mandibular fossa depths were measured. From the axial images, the greatest anteroposterior and mediolateral diameters of the mandibular condyles, angles between the long axis of the mandibular condyle and midsagittal plane, and vertical distances from the geometric centers of the condyles to midsagittal plane were measured. The independent samples t-test was used for comparing the measurements between the two sides and between the Class II division 1 and 2 groups.ResultsNo statistically significant differences were observed between the right and left temporomandibular joints; therefore, the data were pooled. There were statistically significant differences between the Class II division 1 and 2 groups with regard to mandibular fossa depth and anterior joint space measurements.ConclusionsIn Class II patients, the right and left temporomandibular joints were symmetrical. In the Class II division 1 group, the anterior joint space was wider than that in Class II division 2 group, and the mandibular fossa was deeper and wider in the Class II division 1 group. Key words:Temporomandibular joint, Class II malocclusion, Cone beam computed tomography.

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“…Anatomical changes can be seen in the parts with obvious reconstruction. Some scholars have examined the differences in the temporomandibular joint related to diverse malocclusions, and confirmed that the morphological structure and positional relationship between the condyle and articular fossa may be different in patients with various types of malocclusion [3,4].…”

Treatment of the mandibular shift in an adult woman and the diagnostic value of joint space index: a case report

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Occurrence of Malocclusion in Patients with Orofacial Pain and Temporomandibular Disorders

“…Computed tomography (CT) studies found that anterior joint space was significantly wider in class II malocclusion subjects, with a deeper mandibular fossa. 35,36 Another CT study showed a general significant pattern of a more convex and anteriorly positioned condyles. 37 Thus, temporomandibular joint (TMJ) anatomy seems to be distinct in patients with class II malocclusion, subjecting such delicate orofacial structure to a more damage tendency.…”