Optical and Mechanical Properties of Newly Developed Monolithic Multilayer Zirconia.

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Abstract

PURPOSE

To evaluate the optical and mechanical properties of newly introduced monolithic multilayer zirconia with two types of monolithic zirconia.

MATERIALS AND METHODS

Three brands of monolithic zirconia were used in this study: Ceramill Zolid FX Multilayer (CZF), Prettau Anterior (PA), and Zenostar T (ZT). Translucency parameter (TP), contrast ratio (CR), flexural strength, fracture toughness, hardness, brittleness index, and microstructures were assessed. Data were analyzed using one-way ANOVA and Tukey's test. The statistical significance was set at p < 0.05. A Weibull analysis was conducted on the flexural strength data.

RESULTS

CZF revealed significantly higher TP and lower CR compared with PA and ZT monolithic zirconia (p < 0.05). ZT showed higher flexural strength and fracture toughness compared with CZF and PA (p < 0.001). On the other hand, CZF revealed significantly higher hardness values compared with PA and ZT (p < 0.001). CZF and PA revealed higher brittleness index than ZT monolithic zirconia (p < 0.001). ZT showed small grain microstructure while CZF and PA showed larger grains. ZT had a higher characteristic strength (σ0 ), Weibull modulus (m), and a lower probability of failure compared with CZF and PA.

CONCLUSIONS

The optical and mechanical properties of the tested monolithic zirconia are material dependent. Fully stabilized monolithic zirconia materials (CZF and PA) are relatively more translucent than partially stabilized zirconia (ZT).

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