  We investigate the restoration of chiral symmetry at finite temperature in
the SU(2) quark meson model where the mean field approximation is compared to
the renormalized version for quarks and mesons. In a combined approach at
finite temperature all the renormalized versions show a crossover transition.
The inclusion of different renormalization scales leave the order parameter and
the mass spectra nearly untouched, but strongly influence the thermodynamics at
low temperatures and around the phase transition. We find unphysical results
for the renormalized version of mesons and the combined one.
