Abstract
Objectives: This study was designed to assess the smile characteristics in different dentoalveolar malocclusion cases, by standardized photographic analysis. Subjects and methods: A sample of 132 subjects with age range from 18 to 24 years. The study groups were designed according to Angles Classification in to 4 groups. Standardized extraoral photographs at rest position, social smile, maximum smile and profile were taken for each subject. Smile analysis was done by identifying certain measurements digitally via software. Results: The upper and lower lip length showed significant change. The mouth width increased during smiling significantly. The smile area showed no significant different in social smile between all groups. The buccal corridors area showed significant increase. The incisal show had significant difference among allgroups in social smile. The smile arch depth showed no significant difference in social smile among all groups. The gingival exposure significantly increased during maximum smile. Conclusions: Control group showed moderate smile Class I with bimaxillary protrusion, spacing and openbite subgroups showed high smile. Class I with crowding and deepbite subgroups showed low smile. Class II Division 1 group showed high smile while Division 2 showed moderate smile. Class III group showed low smile.
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