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. 2016 Jan 1;42(1 Pt B):1077-1085.
doi: 10.1016/j.ceramint.2015.09.033.

Characterization of three commercial Y-TZP ceramics produced for their high-translucency, high-strength and high-surface area

Hui Tong  1 , Carina B Tanaka  2 , Marina R Kaizer  3 , Yu Zhang  4
Affiliations

Characterization of three commercial Y-TZP ceramics produced for their high-translucency, high-strength and high-surface area

Hui Tong et al. Ceram Int. .

Abstract

Developing yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) with high strength and translucency could significantly widen the clinical indications of monolithic zirconia restorations. This study investigates the mechanical and optical properties of three Y-TZP ceramics: High-Translucency, High-Strength and High-Surface Area. The four-point bending strengths (mean ± standard error) for the three Y-TZP ceramics (n = 10) were 990 ± 39, 1416 ± 33 and 1076 ± 32 MPa for High-Translucency, High-Strength and High-Surface Area, respectively. The fracture toughness values (mean ± standard error) for the three zirconias (n = 10) were 3.24 ± 0.10, 3.63 ± 0.12 and 3.21 ± 0.14 MPa m1/2 for High-Translucency, High-Strength and High-Surface Area, respectively. Both strength and toughness values of High-Strength zirconia were significantly higher than High-Surface Area and High-Translucency zirconias. Translucency parameter values of High-Translucency zirconia were considerably higher than High-Strength and High-Surface Area zirconias. However, all three zirconias became essentially opaque when their thickness reached 1 mm or greater. Our findings suggest that there exists a delicate balance between mechanical and optical properties of the current commercial Y-TZP ceramics.

Keywords: Y-TZP; edge chipping; mechanical properties; monolithic zirconia; optical properties.

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Conflict of interest statement

Conflict of Interest: All authors declare no conflict of interest.

Figures

Figure 1
Figure 1
SEM images of three Y-TZP ceramics: (a) High-Translucency, (b) High-Strength, and (c) High-Surface Area.
Figure 2
Figure 2
XRD patterns of three Y-TZP ceramics: High-Translucency, High-Strength and High-Surface Area. (a) Raw XRD spectral scans revealing major peaks of tetragonal, monoclinic, and cubic phases (20 to 80 degree). (b) XRD patterns in the region that consists of coexisting monoclinic and tetragonal phases (25 to 30 degree). Note: the curves were smoothed out to improve the resolution; (c) XRD patterns in the region that consists of coexisting cubic and tetragonal phases (72 to 76 degree). (d) XRD patterns of High-Strength bars fractured by the four-point bending test, with and without the simulated veneer firing treatment.
Figure 3
Figure 3
Chipping load versus distance from edge for (a) High-Translucency, (b) High-Strength, and (c) High-Surface Area Y-TZP ceramics.
Figure 4
Figure 4
Edge-chipping toughness versus distance from edge for (a) High-Translucency, (b) High-Strength, and (c) High-Surface Area Y-TZP ceramics.
Figure 5
Figure 5
The dependence of transmittance on wavelength and specimen thickness for (a) High-Translucency, (b) High-Strength, and (c) High-Surface Area Y-TZP ceramics relative to (d) porcelain and glass-ceramics. Note: different scales on the axis transmittance in (a) – (d).
Figure 6
Figure 6
Digital photographs of three Y-TZP plates with different thicknesses, d. (From left to right: High-Translucency, High-Strength, and High-Surface Area).
Figure 7
Figure 7
TP values of three Y-TZP plates as a function of thickness.
See this image and copyright information in PMC

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