scholarly journals Amorphous to Tetragonal Zirconia Nanostructures and Evolution of Valence and Core Regions

2015 ◽  
Vol 119 (40) ◽  
pp. 23268-23273 ◽  
Author(s):  
Sesha Vempati ◽  
Fatma Kayaci-Senirmak ◽  
Cagla Ozgit-Akgun ◽  
Necmi Biyikli ◽  
Tamer Uyar
Keyword(s):  
Tetragonal Zirconia ◽  
Zirconia Nanostructures

PREPARATION OF DENSE TETRAGONAL ZIRCONIA CERAMICS FROM ZrO2 MICROPOWDERS

1986 ◽  
Vol 47 (C1) ◽  
pp. C1-237-C1-241
Author(s):  
A. SMITH ◽  
B. CALES ◽  
J. F. BAUMARD
Keyword(s):  
Tetragonal Zirconia ◽  
Zirconia Ceramics

Behavior of 3mol% yttria-stabilized tetragonal zirconia polycrystal film prepared by slurry spin coating

2009 ◽  
Vol 186 (1) ◽  
pp. 128-132 ◽  
Author(s):  
Kongfa Chen ◽  
Yanting Tian ◽  
Zhe Lü ◽  
Na Ai ◽  
Xiqiang Huang ◽  
...  
Keyword(s):  
Spin Coating ◽  
Tetragonal Zirconia ◽  
Tetragonal Zirconia Polycrystal

Mechanical behavior of tetragonal zirconia nanopillars subjected to uniaxial loading: A molecular dynamics study

2020 ◽  
Vol 151 ◽  
pp. 103666
Author(s):  
Jiacheng Zhang ◽  
Mao Zhang ◽  
Lei Deng ◽  
Junsong Jin ◽  
Pan Gong ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Mechanical Behavior ◽  
Tetragonal Zirconia ◽  
Uniaxial Loading

Effect of colourants on the optical characteristics and structure of Y 2 O 3 stabilised tetragonal zirconia ceramic

2021 ◽  
Author(s):  
Jianfeng Chen ◽  
Ning Wen ◽  
Chundong Xue ◽  
Zhaocen Liu ◽  
Zhuoran Liang ◽  
...  
Keyword(s):  
Tetragonal Zirconia ◽  
Optical Characteristics ◽  
Zirconia Ceramic

scholarly journals Quantitative analysis on the wear of monolithic zirconia crowns on antagonist teeth

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Zhenyu Tang ◽  
Xinyi Zhao ◽  
Hui Wang
Keyword(s):  
Epoxy Resin ◽  
Tetragonal Zirconia ◽  
Fatigue Wear ◽  
Posterior Teeth ◽  
Contact Points ◽  
Significant Difference ◽  
Zirconia Crowns ◽  
Natural Teeth ◽  
Monolithic Zirconia

Abstract Background The present study aimed to quantitate the wear of the highly transparent Yttria-stabilized tetragonal zirconia polycrystals (Y-TZP) ceramic monolithic zirconia crown on the enamel in vivo and discuss the prone position of the wear and the underlying mechanism. Methods A total of 43 patients with 43 posterior teeth were selected for full zirconia crown restoration and examined immediately, at 6 months, and at 1 year after restoration. During the follow-up visit, the fine impression of the patients’ monolithic zirconia crowns, the antagonist teeth, the corresponding contralateral natural teeth, the super plaster cast, and epoxy resin model was ontained. The model of epoxy resin was observed under a stereo microscope, and the microstructure parts were observed under a scanning electron microscope. Results After 1 year, the mean depth and volume of wearing of the monolithic zirconia crown were the smallest (all P < 0.01), while those of the antagonist teeth were significantly larger than those of the natural teeth (P < 0.0001), and no significant difference was found among the natural teeth (P = 0.3473, P = 0.6996). The amount of wear after one year was remarkably higher than that at 6 months (P < 0.0001). The microscopic observation revealed the tendency of wearing of the monolithic zirconia crown on the antagonist teeth at the protruding early contact points. Electron micrographs of tooth scars showed that the wearing mechanism of the monolithic zirconia crown on natural teeth was mainly abrasive and fatigue wear. Conclusions Although the self-wearing is insignificant, the monolithic zirconia crown can cause wear of the antagonist teeth via occlusal or early contact significantly; the amount of wearing is higher than that of natural teeth and increases over time. The wearing mechanism is mainly abrasive and fatigue wear.

Stabilization of charged substitutional ions in tetragonal zirconia

2021 ◽  
Author(s):  
Samuel Cotes ◽  
Pablo H. Gargano ◽  
Mariano D. Forti ◽  
Gustavo Ramírez Caballero ◽  
Gerardo H. Rubiolo ◽  
...  
Keyword(s):  
Tetragonal Zirconia

scholarly journals Plasma Polymerized Allylamine—The Unique Cell-Attractive Nanolayer for Dental Implant Materials

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1004 ◽  
Author(s):  
J. Barbara Nebe ◽  
Henrike Rebl ◽  
Michael Schlosser ◽  
Susanne Staehlke ◽  
Martina Gruening ◽  
...  
Keyword(s):  
Intracellular Signaling ◽  
Microwave Plasma ◽  
Cell Attachment ◽  
Tetragonal Zirconia ◽  
Surrounding Tissue ◽  
Material Surface ◽  
Cell Physiology ◽  
Ceramic Surface ◽  
Plasma Chemical ◽  
Unique Cell

Biomaterials should be bioactive in stimulating the surrounding tissue to accelerate the ingrowth of permanent implants. Chemical and topographical features of the biomaterial surface affect cell physiology at the interface. A frequently asked question is whether the chemistry or the topography dominates the cell-material interaction. Recently, we demonstrated that a plasma-chemical modification using allylamine as a precursor was able to boost not only cell attachment and cell migration, but also intracellular signaling in vital cells. This microwave plasma process generated a homogenous nanolayer with randomly distributed, positively charged amino groups. In contrast, the surface of the human osteoblast is negatively charged at −15 mV due to its hyaluronan coat. As a consequence, we assumed that positive charges at the material surface—provoking electrostatic interaction forces—are attractive for the first cell encounter. This plasma-chemical nanocoating can be used for several biomaterials in orthopedic and dental implantology like titanium, titanium alloys, calcium phosphate scaffolds, and polylactide fiber meshes produced by electrospinning. In this regard, we wanted to ascertain whether plasma polymerized allylamine (PPAAm) is also suitable for increasing the attractiveness of a ceramic surface for dental implants using Yttria-stabilized tetragonal zirconia.

Transformation behavior of yttria stabilized tetragonal zirconia polycrystal–TiB2 composites

2001 ◽  
Vol 16 (7) ◽  
pp. 2158-2169 ◽  
Author(s):  
B. Basu ◽  
J. Vleugels ◽  
O. Van Der Biest
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Low Temperature ◽  
Tetragonal Zirconia ◽  
Mechanical Analysis ◽  
Transformation Behavior ◽  
Thermal Expansion Data ◽  
Thermally Induced ◽  
First Time ◽  
Tetragonal Zirconia Polycrystal

The objective of the present article is to study the influence of TiB2 addition on the transformation behavior of yttria stabilized tetragonal zirconia polycrystals (Y-TZP). A range of TZP(Y)–TiB2 composites with different zirconia starting powder grades and TiB2 phase contents (up to 50 vol%) were processed by the hot-pressing route. Thermal expansion data, as obtained by thermo-mechanical analysis were used to assess the ZrO2 phase transformation in the composites. The thermal expansion hysteresis of the transformable ceramics provides information concerning the transformation behavior in the temperature range of the martensitic transformation and the low-temperature degradation. Furthermore, the transformation behavior and susceptibility to low-temperature degradation during thermal cycling were characterized in terms of the overall amount and distribution of the yttria stabilizer, zirconia grain size, possible dissolution of TiB2 phase, and the amount of residual stress generated in the Y-TZP matrix due to the addition of titanium diboride particles. For the first time, it is demonstrated in the present work that the thermally induced phase transformation of tetragonal zirconia in the Y-TZP composites can be controlled by the intentional addition of the monoclinic zirconia particles into the 3Y-TZP matrix.

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