  We have found out that the band inversion in a silicene quantum dot (QD), in
perpendicular magnetic $B$ and electric $\Delta_z$ fields, drastically depends
on the strength of the magnetic field. We study the energy spectrum of the
silicene QD where the electric field provides a tunable band gap $\Delta$.
Boundary conditions introduce chirality, so that negative and positive angular
momentum $m$ zero Landau level (ZLL) edge states show a quite different
behavior regarding the band-inversion mechanism underlying the topological
insulator transition. We show that, whereas some ZLLs suffer band inversion at
$\Delta=0$ for any $B>0$, other ZLLs only suffer band inversion above critical
values of the magnetic field at nonzero values of the gap.
