Low-temperature degradation of different zirconia ceramics for dental applications

2012 ◽  
Vol 8 (3) ◽  
pp. 1213-1220 ◽  
Author(s):  
Philipp Kohorst ◽  
Lothar Borchers ◽  
Jürgen Strempel ◽  
Meike Stiesch ◽  
Thomas Hassel ◽  
...  
Keyword(s):  
Low Temperature ◽  
Zirconia Ceramics ◽  
Dental Applications

scholarly journals Mechanical Properties of Zirconia Ceramics at Low Temperature

1990 ◽  
Vol 98 (1142) ◽  
pp. 1132-1138 ◽  
Author(s):  
Kazunori JIKIHARA ◽  
Mamoru ISHIHARA
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Zirconia Ceramics

Dental Applications of Low-Temperature Nonthermal Plasmas

2013 ◽  
Vol 10 (3) ◽  
pp. 199-206 ◽  
Author(s):  
Gyoo Cheon Kim ◽  
Hyun Wook Lee ◽  
June Ho Byun ◽  
Jin Chung ◽  
Young Chan Jeon ◽  
...  
Keyword(s):  
Low Temperature ◽  
Nonthermal Plasmas ◽  
Dental Applications

Comparison of the Low Temperature Degradation Properties of Two Y-TZP Ceramics for Dental Applications

2011 ◽  
Vol 492 ◽  
pp. 107-111 ◽  
Author(s):  
Yuan Fu Yi ◽  
Ning Wen ◽  
Xiao Ling Wang ◽  
Long Quan Shao ◽  
Chen Wang
Keyword(s):  
Low Temperature ◽  
Flexural Strength ◽  
Monoclinic Phase ◽  
Surface Microstructure ◽  
Force Microscopy ◽  
Dental Application ◽  
Before And After ◽  
Dental Applications ◽  
Degradation Properties

The purpose of this study was to investigate the influence of in vitro low-temperature degradation (LTD) treatments on the structural stability and mechanical properties of two commercial Y-TZP ceramics candidate for dental application. TZ-3YS and TZ-3YS-E powder were chosen because of there minor differences of chemical composition. The two powders were compacted at 200MPa using cold isostatic pressure, and densely sintered at 1500°C and 1450°C for 2hr respectively. Two methods of in vitro LTD treatments were performed, the first is to autoclave specimens in steam at 134°C, 2bar, for 1 to 5hr; the second is to immerse specimens into 4% acetic acid at 80°C for 168 hr. XRD was used to identify the crystal phases, flexural strength were tested according to ISO 6872 standard, surface microstructure was evaluated by Atomic Force Microscopy (AFM). Results show that the relative content of monoclinic phase was increasing with the prolonged aging time, the TZ-3YS was more sensitive to LTD compared with TZ-3YS-E. LTD tests did not necessary reduce the flexural strength of Y-TZP ceramics, the nucleation and growth of monoclinic phase were detected by AFM, and the surface microstructure induced by LTD was not identical between the two Y-TZP ceramics. AFM was a sensitive method to evaluate the transformation of Y-TZP ceramics. To choose appropriate Y-TZP powder for dental application, it is mandatory to examine the microstructure before and after LTD.

Low Temperature Degradation of Y-TZP Ceramic for Dental Applications

2013 ◽  
Vol 873 ◽  
pp. 241-249
Author(s):  
Zhi Kai Wu ◽  
Ning Li ◽  
Wan Qian Zhao ◽  
Jia Zhen Yan
Keyword(s):  
Low Temperature ◽  
Substantial Reduction ◽  
Tetragonal Zirconia ◽  
Ceramic Materials ◽  
Dental Ceramics ◽  
All Ceramic ◽  
Long Time ◽  
Core Thickness ◽  
Dental Applications

Yttria-stabilized tetragonal zirconia polycrystalline (Y-TZP) ceramic has been recently introduced into prosthetic dentistry for the fabrication of crowns and fixed partial dentures (FPDs). The mechanical properties of Y-TZP are the highest ever reported for the all-ceramic materials. This is favorable for the fabrication of multi-unit posterior bridges and the substantial reduction in core thickness. However, Y-TZP ceramic is susceptible to low temperature degradation (LTD), which is detrimental to the long-time survival and aesthetics of zirconia restorations in vivo. This review summarizes the characterization, mechanisms, and influencing factors of the LTD in dental Y-TZP ceramic. In addition, the recent trend of exploring high aging resistant zirconia-based dental ceramics is discussed.

Real-Time Monitoring of Degradation of Zirconia Ceramic by Acoustic Emission

2013 ◽  
Vol 433-435 ◽  
pp. 816-820 ◽  
Author(s):  
Kai Ge Wu ◽  
Chan Yang Choe ◽  
Seung Mi Lee ◽  
Ji Ae Yoo ◽  
Chang Yong Hyun ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Low Temperature ◽  
Time Domain ◽  
Zirconia Ceramic ◽  
X Ray Diffraction ◽  
Zirconia Ceramics ◽  
X Ray ◽  
Ae Signal ◽  
Three Stages ◽  
Ae Signals

Acoustic emission (AE) technique was employed to monitor the low temperature degradation (LTD) behavior of a zirconia ceramic, which was carried out in air at 200°C. AE signals, typical waveform of which exhibited as pulse-like type, were detected during LTD and increased with the duration time of LTD. The AE signal of accumulative counts number and amplitude in time domain exhibited a roughly sigmoid variation including three stages, which reflect approximately the evolution of LTD. The AE findings were supported by X-ray diffraction (XRD) examination. It was suggested that AE technique can be used to monitor the mechanism of LTD of zirconia ceramics.

Effect of sintering holding time on low-temperature degradation of yttria stabilised zirconia ceramics

2014 ◽  
Vol 18 (sup6) ◽  
pp. S6-408-S6-411 ◽  
Author(s):  
U. Sutharsini ◽  
S. Ramesh ◽  
Y. H. Wong ◽  
H. Misran ◽  
F. Yusuf ◽  
...  
Keyword(s):  
Low Temperature ◽  
Holding Time ◽  
Zirconia Ceramics

scholarly journals Gelcast Zirconia Ceramics With High Strength and Simultaneously High Translucency for Dental Applications

2021 ◽  
Author(s):  
Jaroslav Kastyl ◽  
Zdenek Chlup ◽  
Vaclav Pouchly ◽  
Lu Song ◽  
Erik Scasnovic ◽  
...  
Keyword(s):  
Tetragonal Zirconia ◽  
High Strength ◽  
Processing Method ◽  
Density Structure ◽  
Zirconia Ceramics ◽  
Thick Sample ◽  
Dental Restorations ◽  
Structure Surface ◽  
Dental Applications ◽  
Very High

Abstract Translucent zirconia represents a favourite material for monolithic ceramic dental restorations. However, materials approaches employed so far to improve the translucency of zirconia ceramics are accompanied by a significant decline in strength. Thus, we aimed to develop dental 3Y-TZP ceramics that can provide excellent strength and, simultaneously, enhanced translucency. In this investigation, machinable tetragonal zirconia ceramics based on fine mesostructured zirconia particles stabilized with 3 mol% of yttria and prepared by the gelcasting processing method were developed. Properties of sintered samples were characterised, namely: shrinkage, density, structure, surface roughness, hardness, biaxial strength, and total forward transmittance. Zirconia ceramics with an average biaxial strength of 1184 MPa and a total forward transmittance of 46.7% for a 0.5 mm thick sample at a wavelength of 600 nm were obtained. These ceramics exhibited homogeneous structure with grains sizes up to 620 nm and purely tetragonal phase composition. The developed ceramics provided a favourable combination of high translucency comparable even with the mixed cubic/tetragonal structure of a common 4Y-TZP, and very high strength that is achievable only in the pure tetragonal 3Y-TZP.

Preparation of Leucite Powder with Controlled c-Phase Fraction for a Variety of Dental Applications

2007 ◽  
Vol 361-363 ◽  
pp. 897-900
Author(s):  
Alexandra Kloužková ◽  
M. Mrázová ◽  
M. Kohoutková
Keyword(s):  
Particle Size ◽  
Low Temperature ◽  
Dental Materials ◽  
Hydrothermal Conditions ◽  
Preparation Technology ◽  
Low Temperature Preparation ◽  
Main Crystalline Phase ◽  
Materials Used ◽  
Dental Applications ◽  
Temperature Preparation

Leucite (KAlSi2O6) is the main crystalline phase in feldspathic dental materials used for ceramic-fused-to-metal restorations. It occurs in two modifications, low temperature – tetragonal and at temperatures above 600 °C high temperature – cubic modification. The aim of this work was to develop a low-temperature preparation technology of submicron leucite powders with varying ratio of tetragonal and cubic modification. The results show that analcime synthesized in hydrothermal conditions is the suitable precursor for the preparation of leucite with controlled fraction of the c-modification. Homogenous t-leucite having particle size from 2 - 4 μm was prepared by 4h ion-exchange in 4M KCl. Partially stabilized c-leucite was obtained by dual ionexchange; 4h in 4M CsCl led to 48 % of c-modification in the final product.

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