  The one-loop Minimal Supersymmetric Standard Model (MSSM) contributions to
the weak and electromagnetic dipole form factors of heavy fermions are
reviewed. For the $Z$ boson on shell, the weak-magnetic and weak-electric
dipole moments of the $\tau$ lepton and the $b$ quark can be defined and
directly connected to observables. But far from the $Z$ peak, the weak and
electromagnetic dipole form factors are not enough to account for all the new
physics effects. In the context of the calculation of the process $e^+e^-\to
t\bar{t}$ to one loop in the MSSM, we compare the impact on the phenomenology
of the CP-violating dipole form factors of the top quark with the contribution
from CP-violating box graphs. Some exemplificative observables are analyzed and
the relevance of both the contributions is pointed out. The set of tensor
integrals employed, the one-loop expressions for the electromagnetic and weak
dipole form factors in a general renormalizable theory and the SM and MSSM
couplings and conventions are also given.
