Investigating the effect of pre-surgical orthodontic treatment on temporomandibular joint in patients with skeletal class Ⅲ malocclusion by cone-beam computed tomography

doi:10.7518/hxkq.2019.04.015

Abstract

Abstract:

Objective To investigate the effect of pre-surgical orthodontic treatment on temporomandibular joint (TMJ) in patients with skeletal class Ⅲ malocclusion treated with orthodontic-orthognathic surgical treatment. Methods Twenty-four patients with skeletal class Ⅲ malocclusion who underwent orthodontic-orthognathic surgical treatment were included in the study. Before and after the completion of orthodontic treatment, the symptoms of TMJ were examined and recorded, and the short- and the long-axis diameter of the condylar (d), condylar height (h), joint space (L) at different angles, bilateral condylar spacing (R), and the condylar angles were measured, with scanning performed by using cone-beam computed tomography (CBCT). Then, the changes of TMJ symptoms and bone structure at different periods were analyzed. Results No significant changes were observed in the joint symptoms before and after the pre-surgical orthodontic treatment. No significant changes were found in the measurements of the bone structure of TMJ in the dimensional direction (P>0.05). Conclusion In the orthodontic-orthognathic surgical treatment procedure, the pre-surgical orthodontic process does not have a significant effect on TMJ.

Key words: pre-surgical orthodontic, skeletal class Ⅲ malocclusion;, temporomandibular joint, condylar, cone-beam computed tomography

CLC Number:

R783.5

Meiling Guo,Zhen Huang,Chong Wang,Yujiang Wang. Investigating the effect of pre-surgical orthodontic treatment on temporomandibular joint in patients with skeletal class Ⅲ malocclusion by cone-beam computed tomography[J]. West China Journal of Stomatology, 2019, 37(4): 417-421.

Figures/Tables 5

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分级	术前正畸前	术前正畸后
Ai0	17/70.8	17/70.8
AiⅠ	7/29.2	7/29.2
AiⅡ	0/0	0/0

测量项目	T组	T₀组	t值	P值
d₁/mm	19.558	19.541	1.951	0.063
d₂/mm	8.213	8.191	0.894	0.381
R/mm	123.058	122.967	1.647	0.113
α/°	14.878	14.831	0.581	0.567
L_1-45°/mm	2.422	2.433	-1.068	0.297
L_1-90°/mm	2.150	2.158	-0.123	0.903
L_1-135°/mm	2.204	2.187	0.867	0.395
h/mm	22.007	21.972	0.652	0.521
d₃/mm	8.028	8.013	1.349	0.191
L_2-45°/mm	1.963	1.970	-1.205	0.241
L_2-90°/mm	2.054	2.065	-1.770	0.090
L_2-135°/mm	2.016	2.018	-0.115	0.910
d₄/mm	19.679	19.648	1.412	0.171
β/°	9.987	9.961	1.136	0.268
γ/°	65.961	65.908	1.327	0.198