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. 2020 Feb 19:2020:7238263.
doi: 10.1155/2020/7238263. eCollection 2020.

CBCT Analysis of Changes in Dental Occlusion and Temporomandibular Joints before and after MEAW Orthotherapy in Patients with Nonlow Angle of Skeletal Class III

Yi Guo  1 , Xinrui Qiao  1 , Shiyu Yao  1 , Tiancheng Li  1 , Nan Jiang  1 , Cheng Peng  1
Affiliations

CBCT Analysis of Changes in Dental Occlusion and Temporomandibular Joints before and after MEAW Orthotherapy in Patients with Nonlow Angle of Skeletal Class III

Yi Guo et al. Biomed Res Int. .

Abstract

This study focus on the changes of the position and morphology of jaw and condyle after MEAW (the multiloop edgewise arch wire) treatment in adults with a nonlow angle (mean angle or high angle SN - MP > 27°) of skeletal class III (mild to moderate skeletal classs III means -5° < ANB < 0°) malocclusions measured by CBCT (cone beam computed tomography). Twenty adult patients (aged 17-26) with a nonlow angle of skeletal class III malocclusions were selected in this study taken orthodontic treatment by MEAW. CBCT was taken before and after the treatment to analyze the changes of the jaw and condyle. After treatment, the angle of L7-MP decreased 12.2°, L6-MP decreased 10.5°, L1-MP decreased 8.8° (P < 0.001 for each) and U1-SN increased (P < 0.05). There was no significant changes between anterior and posterior APDI index and between anterior and posterior spaces of the TMJ (temporomandibular joint) (P > 0.05). The linear ratio of the TMJ was the LR > 12 before treatment, while it was -12 < LR < 12 after treatment; however, there was no statistically significant difference between them (P > 0.05). There was also no significant change in anterior and posterior position and morphology of the condyle within the joint fossa after the treatment by MEAW in this study. MEAW technology in correcting the class III with nonlow angle patients mainly relies on the compensation of distally and posterior mandibular teeth, rather than the mandible and condyle moving backward to establish a neutral occlusal. This study was approved by the institutional ethics committee of the Second Hospital of Tianjin Medical University (No. KYJJ2013002).

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Conflict of interest statement

The authors declare that there is no conflict of interest regarding the publication of this paper.

Figures

Figure 1
Figure 1
CBCT before and after treatment.
Figure 2
Figure 2
Cephalometric measurements.
Figure 3
Figure 3
Sagittal measurement. A: anterior joint space; P: posterior joint space; S: superior joint space.
Figure 4
Figure 4
Coronal measurement: A: interior joint space; B: superior joint space; and C lateral joint space.
Figure 5
Figure 5
During MEAW treatment.
Figure 6
Figure 6
Maxillary and mandibular locus overlap diagrams.
See this image and copyright information in PMC

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