The Casimir effect is considered for a wedge with opening angle alpha, with
perfectly conducting walls, when the interior region is filled with an iso
tropic and nondispersive medium with permittivity epsilon and permeability
mu. The electromagnetic energy-momentum tensor in the bulk is calculated, t
ogether with the surface stress on the walls. A discussion is given on the
possibilities for measuring the influence of the medium, via the Casimir-Po
lder force. (C) 2001 Academic Press.