Investigation effect of nano ZrO2 contents and temperature on fracture toughness of in-ceram zirconia dental materials

Abstract

Objective: This study describes a general factor-based experiment that applied to researching and investigating on hardness and fracture roughness of in-ceram zirconia both with and without nano zirconia reinforcement. The aim of the study was to evaluate the impact of factors such as the Nano zirconia contents and sintering temperature. Methods: Vickers microhardness method for and the fracture toughness (Indentation Strength) was measured on 5 specimens for each ceramic. SEM and optical microscope have used to measure the volume fraction of each phase, the dimensions, and shapes of the grains and the crack pattern. Experimental design (general factorial method) has used for running experiment. DX7 software used for all statistical analysis. Results: Results show that the nano zirconia improves fracture toughness and hardness, but by increasing, the percentage of nano zirconia this effect will be inverse and the fracture toughness of samples reduced.