[Clinical effect of cortical incision with rapid maxillary expansion to assist orthodontic-orthognathic treatment of skeletal Class Ⅲ malocclusion].

Purpose: To investigate the clinical effect of rapid maxillary expansion with cortical osteotomy combined with orthodontic- orthognathic treatment for skeletal Class Ⅲ malocclusion.

Methods: A total of 84 patients with skeletal Class Ⅲ malocclusion admitted to Jining Dental Hospital from March 2018 to May 2020 were randomly divided into experimental group and control group, with 42 cases in each group. The control group was treated with orthodontic-orthognathic treatment, while the experimental group was treated with orthodontic-orthognathic treatment with rapid maxillary arch expansion by cortical incision.