Accession Number : AD1036471

Title :   Translucency and Strength of High-Translucency Monolithic Zirconium-Oxide Materials

Descriptive Note : Technical Report

Corporate Author : Uniformed Services University of the Health Sciences Lackland AFB United States

Personal Author(s) : Church,Todd D

Full Text :

Report Date : 12 May 2016

Pagination or Media Count : 18

Abstract : 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, Glidewell;Lava 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 (n=5).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 (n=10). 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.

Descriptors :   dental materials , ceramic materials , flexural strength , zirconium oxides , porcelain , fabrication , thickness , computer aided design , dentistry , LIGHT TRANSMISSION , strength(general) , teeth

Subject Categories : Medicine and Medical Research
      Inorganic Chemistry
      Miscellaneous Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE