Abstract
Objectives The aim of this study was to evaluate the bonding strength of self-adhesive luting
cement to zirconia under different surface treatments.
Materials and Methods Thirty-two zirconia samples were randomly divided into eight experimental groups
based on the surface treatment employed (Control: no surface treatment; PMM: wear
with diamond bur; JAT: blasting with glass beads; PMA: wear with a medium-roughness
milling machine; Primer: primer application on the surface without treatment; PMM
+Primer: PMM treatment plus primer application; JAT+Primer: JAT treatment plus primer
application; and PMA+Primer: PMA treatment plus primer application). Cement cylinders
were built on the ceramic surfaces, and the groups were subdivided according to the
storage time employed (i.e., 24 hours or 60 days). After storage, the samples were
subjected to microshear testing.
Statistical Analysis The Kruskal–Wallis test followed by the Dunn test was employed for comparison between
the groups (p < 0.05).
Results The PMM group yielded the optimal results and the mean values increased after both
storage times following the primer application. The Control, PMA, and JAT groups gave
similar results after 24 hours, while the JAT group gave superior results following
primer application over this storage time. After 60 days of storage, all groups gave
improved results following chemical treatment with a primer.
Conclusion It was concluded that mechanical preparation using the diamond bur followed by primer
application significantly improved the bond strength between the ceramic and the luting
cement.
Keywords
ceramics - shear strength - dental prostheses - zirconium
