Abstract: Objective To analyze the completion rate of orthodontic treatment and its influencing factors among primary and secondary school students aged 6-15 in Hefei City, to provide a reference for reducing treatment interruption. Methods Primary and secondary school students aged 6-15 in Hefei City were selected for oral examination by cluster random sampling method between August 2019 and August 2020, and patients who required orthodontic treatment after the examination were selected as subjects. Univariate and multivariate Logistic regression were used to analyze the relevant factors on the completion rate of orthodontic treatment. Results A total of 5 123 students underwent oral examinations in the study, of which 509 required orthodontic treatment. Of the 509 cases of orthodontic treatment, 433 cases （85.07%） completed orthodontic treatment, 76 cases （14.93%） were incomplete. Multivariate Logistic regression analysis showed that age （OR=2.333）, parental education （OR=2.748, 2.326）, orthodontic time （OR=2.217）, orthodontic appliance （OR=2.416）, classification of malocclusion （OR=0.355）, dentition （OR=2.732）, dental anxiety （OR=3.337）, voluntary orthodontic acceptance （OR=2.565）, oral hygiene （OR=2.470）, and trust in a doctor （OR=2.145） were all independent influencing factors for the completion of orthodontic treatment. Conclusions The completion rate of orthodontic treatment for primary and secondary school students aged 6-15 in Hefei City is relatively high, but there are still cases of treatment interruptions. Targeted interventions can be conducted early based on relevant influencing factors to improve the completion rate of orthodontic treatment.

Key words: Orthodontic treatment, Completion rate, Treatment interruption, Influencing factor