Crowding of mandibular incisors.
D000367:Age Factors; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007180:Incisor; D008297:Male; D008310:Malocclusion / Q000209:etiology* / Q000628:therapy*; D008334:Mandible; D008963:Molar; D009971:Orthodontics, Corrective; D012737:Sex Factors; D014095:Tooth, Impacted / Q000150:complications