Three-dimensional morphological changes in the temporomandibular joints of patients with anterior disc displacement with reduction

doi:10.7518/hxkq.2021.02.012

Abstract

Abstract: Objective

To investigate the differences in the temporomandibular joints (TMJs) between patients with anterior disc displacement with reduction (ADDwR) and asymptomatic subjects by using 3D morphometric measurements.

Methods

A total of 15 patients with ADDwR and 10 asymptomatic subjects were enrolled. Then, 3D models of the maxilla and mandible were reconstructed using MIMICS 20.0. Nine morphologic parameters of TMJs on both sides were measured on the 3D solid model. The differences in the parameters were analyzed between the patients and the asymptomatic subjects and between the left and right sides of each group.

Results

The horizontal and coronal condylar angles on the ipsilateral side of the patients were significantly greater than those of the asymptomatic subjects (P<0.01). Meanwhile, the sagittal ramus angle (SRA), medial joint space, lateral joint space, superior joint space, anterior joint space, and posterior joint space in the patients were significantly lower than those in the asymptomatic subjects (P<0.01).

Conclusion

ADDwR will increase the condylar angles to be significantly greater than the normal level and decrease SRA and articular spaces to be significantly smaller than the normal level. The condyles will be displaced upward, closer to the fossa.

Key words: anterior disc displacement, three-dimensional morphology, temporomandibular joint, temporomandibular disorder

CLC Number:

R 782.6

Teng Haidong, Shu Jingheng, Sun Tinghui, Pan Shiyu, Liu Zhan. Three-dimensional morphological changes in the temporomandibular joints of patients with anterior disc displacement with reduction[J]. West China Journal of Stomatology, 2021, 39(2): 203-208.

Figures/Tables 5

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Tab 1

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Tab 3

References 17

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患者	HCA/(°)		CCA/(°)		SRA/(°)		CCW/mm		MJS/mm		LJS/mm		SJS/mm		AJS/mm		PJS/mm
患者	右侧	左侧	右侧	左侧	右侧	左侧	右侧	左侧	右侧	左侧	右侧	左侧	右侧	左侧	右侧	左侧	右侧	左侧
1	18.14	10.17	16.93	11.02	87.35	87.48	21.29	19.98	2.37	2.19	2.44	2.29	0.72	0.82	2.02	1.17	0.49	0.85
2	20.46	27.47	18.85	18.85	87.35	93.23	17.29	18.33	2.11	0.95	2.11	1.45	1.49	1.98	1.42	2.04	1.07	1.68
3	25.94	26.59	9.54	19.08	88.56	89.87	18.95	16.13	2.29	1.88	0.47	0.62	0.09	0.49	1.93	2.11	1.04	1.36
4	23.74	21.33	26.21	15.56	84.12	80.81	17.63	20.18	2.46	2.00	2.17	1.51	1.12	0.79	2.89	2.98	1.08	1.38
5	10.18	17.29	11.24	20.22	88.28	86.57	19.68	19.16	2.77	2.51	1.22	1.94	2.13	1.62	2.12	2.57	2.09	1.79
6	26.09	20.29	10.43	8.89	92.74	90.26	16.78	18.27	0.97	0.91	0.36	0.58	0.28	0.19	3.57	2.79	0.78	0.78
7	29.29	21.16	20.55	16.50	88.51	87.78	14.80	15.45	2.04	0.70	1.77	0.91	0.70	0.20	2.43	1.70	1.42	0.95
8	24.43	25.12	21.86	23.27	80.30	82.02	20.15	18.16	2.29	1.69	1.58	1.40	0.94	1.66	3.47	2.57	1.40	1.40
9	35.86	24.65	22.17	17.59	81.33	79.74	14.97	15.96	2.19	2.26	2.12	1.56	0.83	1.06	3.03	2.38	1.45	1.58
10	23.04	19.47	7.43	3.13	87.62	91.18	16.73	15.86	2.41	2.51	1.77	2.54	2.82	3.30	1.74	3.02	4.86	4.94
11	15.89	24.03	17.98	14.08	87.96	86.96	21.06	18.52	3.11	2.93	2.81	3.44	1.73	2.25	2.98	3.48	1.03	1.46
12	34.49	25.32	15.63	10.38	87.67	89.44	14.11	16.58	2.92	3.31	3.23	5.79	1.76	2.08	0.81	1.40	2.66	2.91
13	21.05	30.34	24.31	22.98	84.09	86.08	15.18	15.07	3.09	2.73	3.97	4.06	2.25	1.97	1.90	1.63	1.47	1.21
14	27.64	29.21	29.12	31.72	93.86	92.23	15.88	15.07	2.89	1.79	3.79	2.46	0.52	0.38	0.69	0.80	1.31	0.68
15	22.98	34.09	19.56	21.30	89.57	85.93	19.13	18.29	2.19	2.40	1.12	1.05	0.68	0.44	2.48	1.74	1.65	0.93

形态学参数	右侧（n=10）	左侧（n=10）	P值
HCA/(°)	12.87（0.31）	12.57（0.37）	0.088
CCA/(°)	12.95（0.60）	12.91（0.63）	0.724
SRA/(°)	99.38（1.30）	99.89（1.52）	0.290
CCW/mm	18.39（2.28）	18.69（2.05）	0.303
MJS/mm	2.78（0.46）	2.84（0.50）	0.445
LJS/mm	2.96（0.47）	3.09（0.77）	0.555
SJS/mm	2.28（0.18）	2.26（0.19）	0.639
AJS/mm	2.90（0.48）	2.64（0.65）	0.295
PJS/mm	2.68（0.61）	2.55（0.82）	0.506

形态学参数	患病侧（n=24）	对照组（n=20）	P值
HCA/(°)	23.97（6.75）	12.72（0.37）	0.000**
CCA/(°)	17.44（6.01）	12.93（0.60）	0.001**
SRA/(°)	86.82（3.79）	99.63（1.40）	0.000**
CCW/mm	17.65（2.14）	18.54（2.11）	0.172
MJS/mm	2.08（0.64）	2.81（0.47）	0.000**
LJS/mm	1.75（0.90）	3.02（0.62）	0.000**
SJS/mm	1.09（0.73）	2.27（0.18）	0.000**
AJS/mm	2.20（0.76）	2.77（0.57）	0.009**
PJS/mm	1.42（0.88）	2.61（0.71）	0.000**

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