RESUMO
PURPOSE: To evaluate the risk factors for the occurrence of recurrent aphthous ulcer (RAU) in Fuzhou city by case-control study. METHODS: A questionnaire survey of 113 patients with RAU and 102 non-RAU patients in the same hospital was made, including 58 items. Chi-square test and conditional logistic regression were used for monovariate and multivariate analysis respectively with SPSS23.0 software package. RESULTS: One-way Chi-square test showed that immigrants, genetic factors, gastrointestinal disorders, menstrual period, oral health status, anxiety were related factors for patients suffering from RAU. Conditional logistic regression analysis indicated that genetic factors as well as more dental calculus in the oral cavity were RAU risk factors. Tendency Chi-square test revealed that there was a negative correlation between the occurrence of RAU and vegetable intake, and a positive correlation with the amount of dental calculus and soft scale in the oral cavity. CONCLUSIONS: The occurrence of RAU is the result of combination of "multiple factors" in the digestive system, genetic system, immune system and oral microenvironment.