The malposed first permanent molar.
D006801:Humans; D008310:Malocclusion / Q000209:etiology*; D008963:Molar; D014078:Tooth Eruption; D014079:Tooth Eruption, Ectopic / Q000517:prevention & control*; D014080:Tooth Exfoliation; D014094:Tooth, Deciduous; D014095:Tooth, Impacted / Q000150:complications*