Main Instructor 姚宗珍
Department / Institution Division of Orthodontics and Dentofacial Orthopedics, Department of Dentistry, National Taiwan University Hospital, Taipei, Taiwan
Classification Case report
Severe deep impinging bites not only cause esthetics problems, but also jeopardize the periodontal health of maxillary teeth, and might lead to excessive wear of front teeth, or gingival recession. In this report, we present a case of retrognathic mandible with two lower premolars missing and an impinging bite by orthodontic combined orthognathic surgery.
This is a 21-year-old female patient with mandibular retrognathism, missing 2 lower second premolars, 12mm overjet, and deep impinging bite. Treatment involved extraction of upper first premolars, combined with the use of closed coil springs and class II elastic to retract upper anterior segment, followed by mandibular advancement with BSSO surgery. Leveling of lower curve of Spee was intentionally delayed before surgery and then resolved by premolar extrusion after the surgery. At the end of treatment, ideal overjet, overbite and stable occlusal relationships were established. Final results showed balanced and facial esthetics.
「Discussion and Summary」
The etiologies of skeletal Class II malocclusion include excessive growth of maxilla, deficient growth of mandible, or the combination of both. Severity of the malocclusion, timing of treatment, and patient concerns should all be considered in developing the treatment plan in order to perceive a successful outcome.
Surgical Treatment of A Skeletal Class II Malocclusion with Deep Impinging Bite- A Case Report