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| A Clinical Study on the Treatment of Maxillary Retraction Deformity with Modified Maxillary Protrusion Appliance |
| WANG Peng, SU Zhejun, Zhang Xingle, et al |
| The Affiliated Hospital of Chengde Medical College, Hebei Chengde 067000, China |
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Abstract Objective: To investigate the effect of maxillary protrusion appliance on the treatment of patients with maxillary retraction deformity during the mixed dentition period with the crowding of the posterior segment of the dental arch. Methods: The modified maxillary protrusion appliances were used to treat 40 cases of skeletal class III malocclusion with maxillary retraction during mixed dentition period. A facemask was used on the face to pull maxillary forward, palatal appliance was used to push molars back and palatal expansion in the mouth. For each patient, the lateral cephalogram was taken before and after treatment. Hard and soft tissue changes were analyzed to evaluate the effects of maxillary protrusion. Results: The anterior teeth overjet increased by 3.6mm, the average forward movement of point A subspinale was 2.1mm, mandibular plane angle was increased by 1.9° on the average, maxillary first molar average 2.5mm backwards. The position relation between maxillary and mandible was improved obviously, and the lateral appearance of soft tissue was improved obviously. Conclusion: The modified maxillary protrusion appliance could effectively treat skeletal class III malocclusion relationship and lateral appearance of the patients with maxillary retraction deformity, and made the first molars moving backward and relieve the dental arch crowding of the posterior segment.
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2018, Vol. 24 
