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KMID : 0358920150420010045
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Journal of the Korean Academy of Pedodontics
2015 Volume.42 No. 1 p.45 ~ p.52
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Facemask Effects in Two Types of Intraoral Appliances : Bonded Expander vs. Hyrax
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Park Chan-Young
Park Ki-Tae
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Abstract
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The purpose of this study was to compare and evaluate facemask effects when two types of intraoral appliances were used for maxillary protraction for patients with class III malocclusion. Eighteen patients with class III malocclusion were treated with a facemask for an average of 12 months. Two types of intraoral appliances were used: nine patients were treated with bonded expander (Group 1), and nine patients with Hyrax (Group 2). Cephalometric radiographs were taken before and after treatment. Cephalometric radiographs were traced, analyzed, and the results such as sagittal, vertical and soft-tissue changes were compared between two groups. The amount of anchorage loss was also measured to evaluate the difference between two groups. All patients showed significant sagittal skeletal changes after treatment, and there was no statistically significant difference between the two groups. When anchorage loss was evaluated, no differences were shown between the two. Facemask with Hyrax or bonded expander is similarly an effective method as a treatment in class III malocclusion patients.
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KEYWORD
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Facemask, Class III malocclusion, Hyrax, Bonded expander, Anchorage loss
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