[Location and shape of the so-called 4th molar: possibility of duplication and fusion of the 3d molar].
D005671:Fused Teeth / Q000209:etiology*; D006801:Humans; D008297:Male; D008963:Molar / Q000002:abnormalities*; D014071:Tooth Abnormalities / Q000209:etiology*; D014096:Tooth, Supernumerary / Q000209:etiology*