Objective:To compare the incidence of white spot lesions(WSLs)between fixed appliances(FA)and clear aligner(CA)through retrospective study.Methods:The intraoral photographs of patients who completed or-thodontic treatment in the West China Hospital of Stomatology were taken using a digital camera before and after treatment.The photographs were placed side by side on a computer monitor to diagnose orthodontic-related WSLs.Non-existent white spot lesions before treatment and faint white opacities after treatment were identified as ortho-dontic-related WSLs.Results:The incidence of WSLs in the CA group was 4.63％,which was significantly lower than that in the FA group(17.27％,P=0.003).Teeth of male patients were more likely to develop WSLs than those of female patients in the CA group(P=0.021).The incidence of WSLs in the adolescents was significantly higher than that in the adults(P＜0.001).More than 25 months of treatment duration were more likely to develop WSLs(P＜0.001).Conclusion:The incidence of post-orthodontic WSLs was lower in the patients with clear align-ers than in the patients with fixed appliance.Besides,adolescent,male,poor oral hygiene,and longer treatment duration were risk factors for post-orthodontic WSLs.
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