摘要
BACKGROUND Palatal expansion treatment has been used to expand the constricted maxillary arch and has become a routine procedure in orthodontic practice over the past decades.However,the long-term stability of expansion in the permanent dentition without a surgical approach is uncertain.CASE SUMMARY We present the case of a 15-year-old boy with Class II malocclusion and constricted arches.The patient was treated with rapid palatal expansion(RPE)followed by a fixed orthodontic appliance.A 7-year follow-up evaluation was performed by analyzing cephalometric radiographs,plaster models,and photographs.The patient’s constricted maxillary and mandibular arches were relived after the expansion treatment.A Class I occlusion and normal arch form were established and maintained in the long-term.CONCLUSION RPE treatment is successful in solving constricted dental arch in the permanent dentition without a surgical approach.Permanent retention and even occlusal contact help prevent long-term relapse.
基金
Supported by the National Natural Science Foundation of China No.81970909(to Liu DW),No.51903003(to Yu TT)
the New Clinical Technology Fund of PKUSS,No.PKUSSNCT-11A07(to Liu DW)
Peking University Medicine Seed Fund for Interdisciplinary Research,No.BMU2018MX007(to Liu DW).
