  The Roth's two-pole approximation has been used by the present authors to
investigate the role of $d-p$ hybridization in the superconducting properties
of an extended $d-p$ Hubbard model. Superconductivity with singlet
$d_{x^2-y^2}$-wave pairing is treated by following Beenen and Edwards
formalism. In this work, the Coulomb interaction, the temperature and the
superconductivity have been considered in the calculation of some relevant
correlation functions present in the Roth's band shift. The behavior of the
order parameter associated with temperature, hybridization, Coulomb interaction
and the Roth's band shift effects on superconductivity are studied.
