Alveolar Process 1 Black triangle 1 Cephalometry 1 Esthetics, Dental 1 Gingiva 1 Humans 1 Incisor 1 Open gingival embrasure Orthodontic treatment 1 Photography, Dental 1 Radiography, Dental 1 Retrospective Studies 1 Risk Factors 1 Tooth Movement Techniques 1 alveolar bone 1 cephalometry 1 dental procedure 1 diagnostic imaging 1 gingiva 1 human 1 incisor 1 medical photography 1 orthodontic tooth movement 1 pathology 1 retrospective study 1 risk factor 1 tooth radiography 1