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Translucency and Strength of High-Translucency Monolithic Zirconium-Oxide Materials
Uniformed Services University of the Health Sciences Lackland AFB United States
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Dental materials manufacturers have developed more translucent monolithic zirconium oxide restorations to combine the esthetics of all-ceramic restorations with the strength properties of zirconia. The purpose of this study was to evaluate the translucency and strength of new highly translucent monolithic zirconia ceramic materials. Four monolithic zirconium-oxide materials marketed as having high translucency BruxZir Shaded 16 and BruxZir HT, GlidewellLava Plus, 3M ESPE inCoris TZI C, Sirona were compared to a high-translucency, lithium disilicate monolithic glass-ceramic material IPS e.max CAD HT Ivoclar Vivadent. To evaluate translucency, the materials were sectioned into 0.5-, 1-, 1.5-, and 2mm- thick specimens using a precision saw, sintered and polished according to the manufacturers instructions n5.Translucency parameter was calculated using a spectrophotometer VITA Easyshade, Vident that measured L, a, and b values. To evaluate flexural strength, the ceramic materials were sectioned using a precision saw to create beams with a final size of 4mm in width, 1.3mm in depth and 15mm in length after sintering in a ceramic oven n10. Each beam specimen was fractured using a universal testing machine with a three-point bending test device. Flexural modulus was determined from the slope of the linear region of the load-deflection curve using the analytical software Instron. Data were examined with one-way ANOVAs with Tukeys posthoc tests. IPS e.max CAD had significantly higher translucency than the other materials at each thickness. In general, the translucencies of the zirconia materials were fairly similar at each thickness. However, at clinically relevant thicknesses, 1mm of BruxZir Shaded 16 and inCoris TZI C were more translucent than Lava Plus and BruxZir HT, but similar in translucency to the 1.5mm-thick specimens of IPS e.max CAD. Translucency significantly decreased for each material at each increase in thickness.
APPROVED FOR PUBLIC RELEASE