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KMID : 0358920200470030235
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Journal of the Korean Academy of Pedodontics
2020 Volume.47 No. 3 p.235 ~ p.247
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Study of Functional Appliance for Treatments of Children and Adolescents with Class II Malocclusion
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Kang Him-Chan
Lee Ko-Eun
Kim Mi-Sun
Nam Ok-Hyung
Lee Hyo-Seol
Kim Kwang-Chul
Choi Sung-Chul
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Abstract
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The purpose of this study was to evaluate the skeletal and dentoalveolar effects and optimal timing for treatment of class II malocclusion with functional appliances in children and adolescents. A group of 30 patients with class II malocclusion were divided into 3 groups according to their use of functional appliance: Twin block, Activator, Frankel appliance. The group was also divided into 2 groups according to the cervical vertebrae maturation method. Lateral cephalometric radiographs were analyzed pretreatment (T0) and posttreatment (T1). Among the functional appliances, treatment with Twin block and Activator showed significant increase in the length of the mandible (Co-Gn) and the lower anterior facial height (ANS to Me), whereas the overjet and overbite were significantly reduced. Treatment with Frankel appliance showed significant improvement in the relationship of maxilla and mandible. In addition, if the functional appliance was used during the period of pubertal growth peak, there was a significant increase in mandibular length, improvement in the relationship of maxilla and mandible, labial inclination of lower incisors and decrease in overjet compared to the treatment before pubertal growth peak. Therefore, this study indicates that using functional appliances for patients with class II malocclusion is effective and the optimal timing for using functional appliances is during pubertal growth peak.
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KEYWORD
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Class II malocclusion, Functional appliance, Treatment timing
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