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Main Instructor Chung-Li Wang
Chun-Liang Kuo
Chun-Hsiu Yang
Chien-Hung Lin
Department / Institution Department of Orthodontics, Chi-Mei Medical Center, Tainan City, Taiwan
Classification Case report
Open bite malocclusion is one of the highly challenging orthodontic problems. Etiology of open bite may be attributed to genetics, anatomic and environmental factors. Orthodontists face several challenges in treating this malocclusion, including whether to recommend extractions or surgery and the maintenance of stability. When the open bite is skeletal, it increases the difficulty of correction and maintenance of stability.
This case presents an orthodontic treatment on 12-year-old female who had a straight profile with anterior open bite, skeletal and dental class III relationship and questionable prognosis of four first permanent molars. She was treated with extractions of four first permanent molars then pull four second permanent molars mesially to substitute. By four first molars extraction, it is speculated that the posterior segments will move mesially, creating the counterclockwise rotation of mandible, thus improving the anterior open bite.
「Discussion & Summary」
The extraction of first molars is an option for the treatment with open bite. There were specific dental and facial criteria, including the type of malocclusion, the amount of crowding, patients’ profile, and the factors related open bite. Careful diagnosis and timely intervention with proper treatment plans will improve the treatment outcomes and long-term stability. After 33-month treatment, the patient was satisfied with treatment results of normal overbite, overjet and esthetic profile.
Extraction of Rour First Molars to Treat Anterior Open Bite