  The infrared behavior of the quark propagator is studied at one loop and in
the Landau gauge ($\xi=0$) using the screened massive expansion of full QCD and
three different resummation schemes for the quark self-energy. The shift of the
expansion point of perturbation theory, which defines the screened expansion,
together with a non-standard renormalization of the bare parameters, proves
sufficient to describe the dynamical generation of an infrared quark mass also
in the chiral limit. Analytically, the scale for such a mass is set by a mass
parameter $M$, whose value is fixed by a fit to the lattice data for quenched
QCD. The quark mass function $\mathcal{M}(p^{2})$ is shown to be in very good
agreement with the lattice results. The quark $Z$-function, on the other hand,
shows the wrong qualitative behavior in all but one of the studied resummation
schemes, where its behavior is qualitatively correct, but only at sufficiently
high energies.
