Evaluation of compressive and adhesive strengths of a hybrid ceramic and 5Y-PSZ zirconia cemented with three different materials.

Abstract

This study aimed to evaluate the compressive and adhesive strengths of ceramic restorations (PICN and 5Y-PSZ zirconia) cemented with one of three types of cements: conventional glass ionomer cement (GI), resin-modified glass ionomer cement (RM-GI), and self-adhesive resin cement (R). Ceramic specimens (5Y-PSZ, n = 72; PICN, n = 60) were prepared for testing after cementation onto glass fiber-reinforced resin-based composite tooth analogs. The 5Y-PSZ specimens underwent tribochemical silica coating before cementation. Specimens intended for compressive strength evaluation were mechanically cycled (500,000 cycles) before testing. A microtensile bond strength test was used to evaluate adhesive strength, with specimens sectioned into microbars (1 mm² cross-section) and loaded until fracture. If pre-test failures occurred, bond strength was assessed using microshear tests. PICN restorations showed significantly higher compressive strength than 5Y-PSZ. For PICN, self-adhesive resin cement yielded the highest compressive strength. For adhesive strength, PICN restorations cemented with self-adhesive or RM-GI cements outperformed GI. The 5Y-PSZ+R combination showed the highest microshear bond strength, superior to 5Y-PSZ+RM-GI and 5Y-PSZ+GI. Resin cements showed higher compressive and adhesive strengths for PICN than glass ionomer-based cements. For 5Y-PSZ, the cement type did not significantly affect compressive strength. Overall, PICN restorations outperformed 5Y-PSZ in compressive and adhesive strengths.