The median diastema.
D000539:Alveolar Process / Q000032:analysis / Q000503:physiopathology; D000848:Anodontia / Q000150:complications; D001915:Braces / Q000009:adverse effects; D002648:Child; D003481:Cuspid / Q000502:physiology; D003724:Dental Arch / Q000033:anatomy & histology; D003970:Diastema / Q000209:etiology / Q000503:physiopathology / Q000628:therapy*; D006801:Humans; D007180:Incisor / Q000002:abnormalities / Q000502:physiology; D007742:Labial Frenum / Q000033:anatomy & histology; D008310:Malocclusion / Q000150:complications / Q000628:therapy*; D010155:Palatal Expansion Technique / Q000009:adverse effects; D010347:Patient Care Planning; D010513:Periodontal Ligament / Q000033:anatomy & histology / Q000503:physiopathology; D014078:Tooth Eruption; D014087:Tooth Movement Techniques