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).
Highlights
Skeletal class III patients with a high angle have always been the Gordian knot of orthodontic treatment
Some scholars believe that class III intermaxillary traction which is used in the treatment of class III malocclusion may increase the joint area load, causing the condyle to move backward, thereby inducing or aggravating joint symptoms [7]
The skeletal class III high angle has always been a challenging type for orthodontic treatment
Summary
Skeletal class III patients with a high angle have always been the Gordian knot of orthodontic treatment. To release anterior crossbite of high-angle skeletal class III malocclusion patients mainly through the mandible rotated clockwise, the occlusal plane reversal and tilt compensation of maxillary and mandibular anterior teeth [4]. The finite element study showed that intermaxillary class III traction would cause the tensile stress on anterior inclined plane and the compressive stress on the posterior inclined plane of the condyle [6]. Some scholars believe that class III intermaxillary traction which is used in the treatment of class III malocclusion may increase the joint area load, causing the condyle to move backward, thereby inducing or aggravating joint symptoms [7]. The multiloop edgewise arch wire (MEAW) technique developed by Kim provides an effective approach
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