The development of approximal dental caries in the first permanent molar teeth.
D000367:Age Factors; D002648:Child; D002675:Child, Preschool; D003731:Dental Caries / Q000453:epidemiology / Q000209:etiology*; D003766:Dental Occlusion; D006801:Humans; D008963:Molar; D012737:Sex Factors; D014078:Tooth Eruption; D014094:Tooth, Deciduous