Assessment of shear bond strength of Polycarboxylate cement reinforced by different amounts of Hydroxyapatite

Abstract

This study was done to assess bond strength of Polycarboxylate cement reinforced
by different amount of Hydroxyapatite. In this study a hydroxyapatite materials were
added to Polycarboxylate cement at different ratios;10%, 15%, 20%, 25% and 30% (
by weight ) and the bond strength was detected by construction a cylinders from these
mixed materials, constructed on exposed dentine of human extracted premolar teeth
and by Zwick’s universal testing machine the bond strength were detected for these
mixed materials. Results showed that the Polycarboxylate reinforced by
hydroxyapatite has higher bond strength than conventional Polycarboxylate cement
and the hydroxyapatite powder to Polycarboxylate cement powder ratio by weight
best to be 20%. The addition of hydroxyapatite to conventional Polycarboxylate
cement increased its bond strength to dentine.