Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 1, Pages 1077-1085Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2015.09.033
Keywords
Mechanical properties; Optical properties; Y-TZP; Edge chipping; Monolithic zirconia
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Funding
- United States National Institute of Dental & Craniofacial Research, National Institutes of Health [2R01DE017925]
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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 m(1/2) 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. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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