Abstract: Objective:The purpose of this study is to compare and analyze the general demography characteristics and clinical indications of adult orthodontic patients who choose different orthodontic devices, integrate the characteristics of patients in many aspects into the selection of orthodontic devices, and provide reference for orthodontists to help patients choose appropriate orthodontic devices.method:180 adult orthodontic patients were selected as the research objects, and the research objects were divided into two groups according to the types of appliances: invisible appliances group (122) and fixed appliances group (58). The general demography characteristics and clinical indications of the two groups of patients were analyzed and compared.Results:The patients in the invisible appliance group were older than those in the fixed appliance group (28 ± 6.8 years>21.9 ± 1.6 years, P=0.037), had a higher family income than those in the fixed appliance group (P=0.001), and had more patients living in different places than those in the fixed appliance group (69.7%>19%, P=0.011). There was statistical significance between the two groups (P<0.05). The proportion of classification of malocclusion and sagittal skeletal relationship between the two groups of patients is similar, and there is no statistical significance between the two groups. In the profile assessment, patients in the fixed appliance group exhibited a more prominent lower lip than those in the invisible appliance group (lower lip E line distance: 3.3 ± 2.2 mm>0.9 ± 2.0 mm, P=0.016), and other variables were not statistically significant. The average DMFT of the two groups of patients was 2.6, and the fixed appliance group was higher than the invisible appliance group (3.5 ± 1.4>2.1 ± 0.9, P=0.005). Among the variables included in the DMFT evaluation, only the number of decayed teeth was higher in the fixed appliance group than in the invisible appliance group (P<0.001), and other variables were not statistically significant. The gingival index (GI) of the two groups of patients was 1.4 ± 0.4, and the plaque index (PI) was 0.69 ± 0.52, with no statistical significance between the two groups.Conclusion:1.Compared with patients who choose fixed appliances, patients who are older, have a permanent residence in another city, and have a higher family income tend to choose invisible appliances.2.Compared with patients who choose invisible appliances, patients who choose fixed appliances have a more prominent lower lip, poor profile, and more decayed teeth in the mouth.

Key words: Invisible appliances, Fixed appliances, Adult orthodontic patients, General demography characteristics, Clinical indication