Abstract: Objective To establish a database of the proximal surface morphology of maxillary premolars among the adolescents and provide references for clinical practice and the preparation and modification of the related appliance such as matrix bands. Methods 219 patients who met the inclusion criteria were randomly selected from the CT image database of Anyang Stomatological Hospital. The images were adjusted to appropriate position to capture the screen. Then the screenshots were imported into ArtForm 2.0, the points were fixed and the five curvature radiuses were measured. Results All the measurements were positive except for the horizontal-gingiva of mesial surface of the first maxillary premolar. All the three vertical curvature radiuses of mesial surface of the second maxillary premolar of male were larger than those of the female. Conclusions There is a depression on the mesial surface close to cervix of the first maxillary premolar. The longitudinal mesial surface of the second maxillary premolar of male is flatter than that of the female.

Key words: Key word：proximal surface morphology, maxillary premolar, adolescent