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Main Instructor Hoi-Shing Luk
Chih-Chen Chou
Wen-Ken Tai
Chia-Tze Kao
Department / Institution Orthodontic Department, Chung Shan Medical University Hospital
Classification Case report
Abnormal oral function might cause interferences of dentofacial growth in the mixed dentition. Various orthodontic appliances have been published for the treatment of this problem. Therefore, the present case report display the overall occlusion changes that occurred during the treatment with a pre-orthodontic trainer The aim of this case report is to comparing the results of these changes by using cephalometric X ray tracing and digital dental model analysis .
Case report:
This is a 9Y1M girl whose chief compliant was anterior large overjet, lip incompetence, mandible retrusion and no without thumb-sucking habit. Treatment plan was two stages orthodontic treatment. The first stage is focused on the myofunction therapy by habit trainer. The patients were instructed to wearing the trainer (Myofunctional Research Co., Queensland, Australia) every day for two hour and overnight while she slept. Initial Cephalometric analysis showed SNA=77。, SNB=70。, U1-NA=6mm, L1-NB=7mm,U1-SN=106。, IMPA=97。.
Final cephalogram x ray and model were taken after 14 months of trainer therapy. Final Cephalometric X ray analysis showed SNA=77。,SNB=71。, U1-NA=2.5mm, L1-NB=9mm,U1-SN=95。, IMPA=100。The patient’s final stone model were scanned by scanner (3Shape TRIOS® Intraoral Scanner) and overlapped by software. The second stage orthodontic treatment of this patient was by the fixed orthodontic appliance. The treatment outcome of this patient showed satisfaction. Superimposed cephalogram found with sagittal growth of the mandible, increased in SNB angle, increased the total facial height, procline of lower incisor and reduced overjet.
This case report illustrates that pre-orthodontic trainer application might improve dento-alveolar changes that result in a significant reduction of overjet. The early myofunction appliance application might help the patient in the following fixed orthodontic therapy.  
Early Interceptive Myofunctional Treatment on Class II, Division 1 Patient