title: Characterization of three commercial Y-TZP ceramics produced for their high-translucency, high-strength and high-surface area.
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 m1/2for 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.
authors.affiliation: New York University College of Dentistry, Department of Biomaterials and Biomimetics, 433 First Avenue, Room 810, New York, NY 10010, USA ; School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, P.R. China.
authors.forename: Hui
authors.initials: H
authors.lastname: Tong
authors.affiliation: New York University College of Dentistry, Department of Biomaterials and Biomimetics, 433 First Avenue, Room 810, New York, NY 10010, USA ; Department of Dental Materials, School of Dentistry, University of São Paulo, São Paulo, Brazil.
authors.forename: Carina B
authors.initials: CB
authors.lastname: Tanaka
authors.affiliation: New York University College of Dentistry, Department of Biomaterials and Biomimetics, 433 First Avenue, Room 810, New York, NY 10010, USA ; Federal University of Pelotas, Graduate Program in Dentistry, Pelotas, Brazil.
authors.forename: Marina R
authors.initials: MR
authors.lastname: Kaizer
authors.affiliation: New York University College of Dentistry, Department of Biomaterials and Biomimetics, 433 First Avenue, Room 810, New York, NY 10010, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
keywords: Y-TZP; edge chipping; mechanical properties; monolithic zirconia; optical properties