Space observation following loss of the mandibular first primary molars in mixed dentition.
D002648:Child; D002675:Child, Preschool; D003724:Dental Arch / Q000033:anatomy & histology*; D003818:Dentition, Mixed; D005260:Female; D006801:Humans; D008297:Male; D008310:Malocclusion / Q000473:pathology; D008334:Mandible; D008963:Molar / Q000502:physiology*; D014080:Tooth Exfoliation / Q000503:physiopathology*; D014085:Tooth Migration / Q000473:pathology; D014094:Tooth, Deciduous / Q000502:physiology*