Aesthetic evaluation of gingival line and crown shape of first premolar instead of canine in unilateral maxilla

    ZHANG Yan, DUAN Yinª²Zhong, YUAN Feng, ZENG Guang

    Department of Orthodontics, Stomatological College, Fourth Military Medical University, Xi¬ðan 710033, China

    ¡¾Abstract¡¿ AIM: To assess the change of gingival line and the shape of the first premolar instead of canine in unilateral maxilla,as so to provide some theoretical reference for clinical treatment. METHODS: Twentyª²two patients (male 9, female 13) with the upper first premolars instead of canines were selected.Their teeth were divided into 2 groups: experiment group (the first premolars instead of canines), control group (contralateral canines). The length, width, axial gradient for the crowns£¬the heigh of gingival line,the width of anterior dentition and the ratio of crista marginalis of their teeth were measured and analysed in their photographs and dental casts after orthodontic treatment. Differences between the 2 groups were evaluated in a paired tª²test. RESULTS: Compared with the control group, significant differences were found in the 5 linear and proportional ......