  Consider a primitive polynomial $f$ in two variables, thought of as a map
from the affine plane to the affine line. We study the minimimal
compactification of $f$; from our result one deduces in particular that if one
of the fibers of $f$ has only one fiber at infinity, then all the fibers of $f$
have a simultaneous resolution of singularities at infinity. From this one gets
a very simple proof of the Suzuki-Abhyankar-Moh theorem on the embeddings of
the affine line in the plane.
