Abstract:
Objective To investigate the characteristics of morphology and growth-associated remodeling of the temporomandibular joint of skeletal classⅡ malocclusion adolescents with hyperdivergent pattern.
Methods A retrospective study was conducted with 52 skeletal classⅡ malocclusion adolescents with hyperdivergent pattern, 54 normal control adolescents and 50 skeletal class Ⅱ malocclusion adults with hyperdivergent pattern selected from the patients who visited the department of orthodontics of Jianli Stomatological Hospital of Dongguan between January 2015 and October 2019. CBCT scans were acquired in centric occlusion. NNT viewer 5.1 software was used to rebuild 3D image data of the temporomandibular joint. 11 items related with the morphology of the condyle, the morphology of the glenoid fossa and the TMJ space were compared between the skeletal class Ⅱ malocclusion adolescents with hyperdivergent pattern and normal control adolescents, and between the adolescents and adults with skeletal class Ⅱ malocclusion and hyperdivergent pattern using the independent sample t test.
Results Compared with the normal control adolescents, the condyles of the skeletal class Ⅱ malocclusion adolescents with hyperdivergent pattern were smaller, shorter, tipped more anteriorly and positioned more anteriorly, angles of the posterior wall of articular tubercle were smaller (P<0.001) . Compared with the skeletal class malocclusion adults with hyperdivergent pattern, the condyles of the skeletal class Ⅱ malocclusion adolescents with hyperdivergent pattern were smaller and shorter, and the depth and the width of the glenoid fossa were narrower (P<0.001) .
Conclusions Skeletal class Ⅱ malocclusion adolescents with hyperdivergent pattern have different forms and positions of condyle, forms of glenoid fossa compared with normal control adolescents. With the increase of the ages, the forms of the condyle and the widths of glenoid fossa of skeletal class Ⅱ malocclusion patients with hyperdivergent pattern increase, while the positions of the condyle and the growth pattern remain stable.
Key words:
Adolescents,
Temporomandibular joint,
Cone-beam computed tomography,
Skeletal classⅡ,
Hyperdivergent
Lian Zhou, Dongqiang Zhang, Haitao Xu. A CBCT study on the morphology of the temporomandibular joint of skeletal classⅡ malocclusion adolescents with hyperdivergent pattern[J]. Chinese Journal of Stomatological Research(Electronic Edition), 2020, 14(04): 235-239.