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Main Instructor Min-Chih Hung
Chung-Chen Jane Yao
Department / Institution Division of Orthodontics and Dentofacial Orthopedics, 

Department of Dentistry, National Taiwan University Hospital;

Graduate Institute of Clinical Dentistry, School of Dentistry, College of Medic
Classification Case report
(1)      「Objective」
To demonstrate correcting anterior crossbite in a growing child using facemask
(2)      「Case」
    This case was a 9 years old female with the protruded chin and the anterior crossbite. Cephalometric film showed the Class III skeletal pattern with high mandibular plane angle, and hand wrist film suggested the patient was in MP3 capping stage. Intraorally, the patient presented anterior crowding, 6 mm negative overjet, and 6 mm overbite in CR. After maxillary expansion with Schwarz appliance for relieving anterior crowding, facemask was used to protract the maxilla until 3 mm positive overjet was achieved. Phase II treatment with extractions prohibited further proclination of upper incisors. Harmonic profile with good occlusion was obtained.
(3)      「Discussion and summary」
Treating the Class III skeletal pattern orthodontically was always one of the greatest challenge in orthodontics. The protruded mandible with the anterior crossbite would hinder the normal growth of the maxilla and further jeopardized the compensation of the maxillary and mandibular dentoalveolar structure. If left untreated, restricted maxillary growth would lead to possible surgery treatment after growth completion. In this case, by using the traditional facemask with maxillary expander to protract the maxilla, we unlocked her anterior crossbite and harmonize the profile. She was now under regular follow up for further growth monitoring.
Facemask for Treating Anterior Crossbite in a Growing Child with Class III Skeletal Pattern