Abstract
The patients with Class Ⅱ, division 1 malocclusion mainly possess increased overjet, proclined upper incisors, and retrognathic mandible. For those Class Ⅱ patients with incompetent lips, the risk of trauma to their maxillary incisor is more than that of the other malocclusions. The approaches to treat Class Ⅱ, division 1 malocclusion include growth modification, dental camouflage and surgical orthodontics. In adolescent patients, the mandibular growth pattern is significant factor to gain good result. To utilize the favorable growth pattern in terms of downward and forward direction by functional appliance in Class Ⅱ patients enables clinicians to successfully reduce the overjet and to improve the facial profile noticeably. Normally the occlusion after the functional appliance phase would still require fixed appliance to detail and settle the final occlusion. The case reported was an 11-year-old boy presenting with Class Ⅱ, division 1 malocclusion associated with excessive overjet, deep overbite, and retrognathic mandible. The patient was treated with Twin-Block appliance first to correct the main deteriorated clinical features, and non-extraction orthodontic fixed appliance treatment was thereafter applied. The treatment duration lasted for 3 years. The treatment changes were assessed by comparing the pre-treatment and post-treatment PAR (Peer Assessment Rating) index, and the outcome revealed the satisfactory result.
Published Version
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