  At the chiral restoration/deconfinement transition, most hadrons undergo a
Mott transition from being bound states in the confined phase to resonances in
the deconfined phase. We investigate the consequences of this qualitative
change in the hadron spectrum on final state interactions of charmonium in hot
and dense matter, and show that the Mott effect for D-mesons leads to a
critical enhancement of the J/$\psi$ dissociation rate. Anomalous J/psi
suppression in the NA50 experiment is discussed as well as the role of the Mott
effect for the heavy flavor kinetics in future experiments at the LHC. The
status of our calculations of heavy quarkonium dissociation cross sections due
to quark and gluon impact is reviewed, and estimates for in-medium effects due
to the lowering of the ionisation threshold are given.
