A CBCT study on the morphology of the temporomandibular joint of skeletal classⅡ malocclusion adolescents with hyperdivergent pattern

doi:10.3877/cma.j.issn.1674-1366.2020.04.006

Abstract

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.

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References 17

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测量项目	青少年骨性Ⅱ类高角组（n = 104）	青少年正常对照组（n = 108）	t值	P值
ML（mm）	13.80 ± 2.18	16.01 ± 1.33	-8.856	<0.001^a
AP（mm）	5.23 ± 1.06	6.90 ± 1.23	-10.509	<0.001^a
AC（°）	23.03 ± 4.80	21.81 ± 4.36	1.949	0.053
HC（mm）	15.55 ± 1.64	16.63 ± 1.93	-4.898	<0.001^a
DF（mm）	7.15 ± 0.92	7.42 ± 1.46	-1.607	0.110
WF（mm）	13.96 ± 1.66	13.99 ± 1.61	-0.169	0.866
AT（°）	45.16 ± 9.15	50.81 ± 8.21	-4.731	<0.001^a
AI（°）	65.63 ± 4.68	60.22 ± 3.64	9.508	<0.001^a
AS（mm）	1.99 ± 0.44	2.26 ± 0.48	-4.308	<0.001^a
SS（mm）	2.52 ± 0.47	2.80 ± 0.51	-4.231	<0.001^a
PS（mm）	2.28 ± 0.39	2.31 ± 0.50	-0.542	0.589

测量项目	青少年骨性Ⅱ类高角组（n = 104）	青少年正常对照组（n = 108）	t值	P值
ML（mm）	13.80 ± 2.18	16.01 ± 1.33	-8.856	<0.001^a
AP（mm）	5.23 ± 1.06	6.90 ± 1.23	-10.509	<0.001^a
AC（°）	23.03 ± 4.80	21.81 ± 4.36	1.949	0.053
HC（mm）	15.55 ± 1.64	16.63 ± 1.93	-4.898	<0.001^a
DF（mm）	7.15 ± 0.92	7.42 ± 1.46	-1.607	0.110
WF（mm）	13.96 ± 1.66	13.99 ± 1.61	-0.169	0.866
AT（°）	45.16 ± 9.15	50.81 ± 8.21	-4.731	<0.001^a
AI（°）	65.63 ± 4.68	60.22 ± 3.64	9.508	<0.001^a
AS（mm）	1.99 ± 0.44	2.26 ± 0.48	-4.308	<0.001^a
SS（mm）	2.52 ± 0.47	2.80 ± 0.51	-4.231	<0.001^a
PS（mm）	2.28 ± 0.39	2.31 ± 0.50	-0.542	0.589

组别	侧数	髁突前移位	髁突中位	髁突后移位
青少年骨性Ⅱ类高角组	104	34（33）	49（47）	21（20）
青少年正常对照组	108	22（20）	70（68）	16（12）

组别	侧数	髁突前移位	髁突中位	髁突后移位
青少年骨性Ⅱ类高角组	104	34（33）	49（47）	21（20）
青少年正常对照组	108	22（20）	70（68）	16（12）

测量项目	青少年骨性Ⅱ类高角组（n = 104）	成人骨性Ⅱ类高角组（n = 100）	t值	P值
ML（mm）	13.80 ± 2.18	16.54 ± 2.53	-8.296	<0.001^a
AP（mm）	5.23 ± 1.06	7.50 ± 1.21	-14.199	<0.001^a
AC（°）	23.03 ± 4.80	22.98 ± 3.96	0.089	0.930
HC（mm）	15.55 ± 1.64	17.80 ± 1.94	-8.966	<0.001^a
DF（mm）	7.15 ± 0.92	7.54 ± 1.31	-2.440	0.016^a
WF（mm）	13.96 ± 1.66	16.88 ± 2.35	-10.213	<0.001^a
AT（°）	45.16 ± 9.15	46.03 ± 8.10	-0.175	0.475
AI（°）	65.63 ± 4.68	66.19 ± 5.11	-0.815	0.416
AS（mm）	1.99 ± 0.44	2.07 ± 0.20	-1.718	0.088
SS（mm）	2.52 ± 0.47	2.64 ± 0.38	-1.933	0.055
PS（mm）	2.28 ± 0.39	2.32 ± 0.46	-0.716	0.475

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