Ion Radiation Effects Of Strengthening Of Ceramics Based On Zirconia

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Ion Radiation Effects Of Strengthening Of Ceramics Based On Zirconia

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Author : Y. Annenkov
language : en
Publisher:
Release Date : 1999

Ion Radiation Effects Of Strengthening Of Ceramics Based On Zirconia written by Y. Annenkov and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

Effect Of Ion Radiation On The Electrical Conductivity Of Zirconia

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Author : T.Pichugin Frangul'yan (V)
language : en
Publisher:
Release Date : 2001

Effect Of Ion Radiation On The Electrical Conductivity Of Zirconia written by T.Pichugin Frangul'yan (V) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.

Electrical Conductivity Of Zirconia And Its Change And The Effect Of Ion Radiation

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Author : T. Frangul'yan
language : en
Publisher:
Release Date : 2000

Electrical Conductivity Of Zirconia And Its Change And The Effect Of Ion Radiation written by T. Frangul'yan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.

Advances In Ceramics

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Author : Costas Sikalidis
language : en
Publisher: BoD – Books on Demand
Release Date : 2011-09-06

Advances In Ceramics written by Costas Sikalidis and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011-09-06 with Science categories.

The current book consists of twenty-four chapters divided into three sections. Section I includes fourteen chapters in electric and magnetic ceramics which deal with modern specific research on dielectrics and their applications, on nanodielectrics, on piezoceramics, on glass ceramics with para-, anti- or ferro-electric active phases, of varistors ceramics and magnetic ceramics. Section II includes seven chapters in bioceramics which include review information and research results/data on biocompatibility, on medical applications of alumina, zirconia, silicon nitride, ZrO2, bioglass, apatite-wollastonite glass ceramic and b-tri-calcium phosphate. Section III includes three chapters in applications of ceramics in environmental improvement and protection, in water cleaning, in metal bearing wastes stabilization and in utilization of wastes from ceramic industry in concrete and concrete products.

Mechanical Physical Properties Of Zirconia Based Ceramic Restorations

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Author : Ishita Agarwal
language : en
Publisher:
Release Date : 2013

Mechanical Physical Properties Of Zirconia Based Ceramic Restorations written by Ishita Agarwal and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.

OBJECTIVE: The most critical issues facing restorations are strength, hardness, chemical stability and discoloration. Therefore, the aim of the in-vitro study was to evaluate and compare various full contour monolithic zirconia (FCZ) based restorations with the established lithium disilicate (LS2) in terms of flexural strength, hardness, solubility in acidic environment, critical surface tension and color stability. METHOD: Five different ceramic materials were tested in this study. Four materials were FCZ namely BruxZir (Glidewell Lab.), Zirlux (Zahn Dental), Zenostar (Ivoclar Vivadent) and Lava (3M ESPE). The fifth material was lithium disilicate (LS2) (Ivoclar Vivadent) that served as a control. Five parameters namely Flexural Strength, Critical Surface Tension (Surface energy), Hardness, Chemical Solubility and Color stability were determined. The groups were as follows: Group A had ten specimens from each group (n=10) of size 20 X 4 X 1. 2 mm. Flexural strength followed by Critical Surface Tension (CST) were measured for this group. Load bearing capacities of the materials were evaluated by measuring flexural strength through Three- point Bending Test on the Universal Testing Machine as per the ISO 6872 (International Organization for Standardization). Consecutively, in order to see the effect of Radiofrequency Glow Discharge Treatment (RFGDT) on surface energy and wettability, the CST of two samples per group was determined before and after RFGDT using the Goniometer. Group B had ten specimens from each group (n=10) of size 12 X 6 X 4 mm. They were tested for hardness, chemical solubility and color stability as per American Dental Association (ADA) Spec. 69. In order to determine the hardness of the material, Vickers Hardness was measured by Tukon Microhardness tester under a 1kgf load over 15s. Thereafter the specimens were tested for their chemical solubility as per ISO 6872 by extracting the samples using 4% acetic acid in the soxhlet extractor. To determine the effect of acid on the materials, the hardness was re-measured. Besides that, to find the color stability of ceramic materials the baseline color (CIELAB) was measured using a surface colorimeter. Then the specimens were subjected to staining solution in a rotating apparatus for four days. Color was measured two times in a day after every 12 hrs. RESULTS: One way ANOVA results indicated a statistically significant difference in mean flexural strength among the groups. The follow up Tukey HSD suggests that LS2 has significantly lower flexural strength than all other groups. Among FCZ, Zirlux had lower strength than BruxZir. Furthermore, RFGDT increased the CST of the ceramic materials from 33mN/m to 39mN/m. Hardness results showed that LS2 has significantly lower hardness than FCZ.^Among FCZ, Zenostar had lower hardness than Lava. However, there was no significant difference in color stability and chemical solubility among groups. CONCLUSION: Our study indicates superior load bearing capacity and hardness of FCZ as compared to LS2. Surface activation of all material after RFGDT is valuable in terms of cementation and bonding of FCZ and or LS2 to tooth. However the chemical solubility and color stability results did not show any difference among the groups. Therefore, it can be concluded that FCZ are significantly better than LS2 in terms of the flexural strength and hardness. Hence, FCZ have all the properties required for a restorative material. Further clinical studies are required to validate this.

The Effects Of Second Phase Zirconia Particles On The Strength And Toughness Of A Mullite Ceramic

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Author : Joseph Moran
language : en
Publisher:
Release Date : 1987

The Effects Of Second Phase Zirconia Particles On The Strength And Toughness Of A Mullite Ceramic written by Joseph Moran and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with Experimental Physics Theses categories.

Theory Of Ceramic Zirconia Composites Toughening Strengthening And Synergism

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Author : B. Budiansky
language : en
Publisher:
Release Date : 1990

Theory Of Ceramic Zirconia Composites Toughening Strengthening And Synergism written by B. Budiansky and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.

A review is given of recent theoretical results concerning toughening and strengthening in brittle ceramics reinforced with dilatantly transforming zirconia particles. Small-scale analysis of 'long' dominant cracks provides resistance curves that exhibit peak fracture toughnesses for finite amounts of crack growth. Similar results for the tensile fracture strengths of 'short' cracks have implications for transformation strengthening. The interaction due to the presence of both transforming particles and ductile metal particles can result in synergistic reinforcing effects over a parametric range of material properties. Keywords: Ceramic materials, Zirconium alloys, Particle reinforcements, Mechanical properties, Crystal structure, Transformation toughening, Transformation strengthening, Synergism. (JG).

Zirconia Based Reconstructions

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Author : Irena Sailer
language : en
Publisher:
Release Date : 2009

Zirconia Based Reconstructions written by Irena Sailer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.

Microwave Sintering Of Zirconia Based Ceramics For Use In High Strength Dental Restoratives

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Author : Thomas J. Fleming
language : en
Publisher:
Release Date : 2007

Microwave Sintering Of Zirconia Based Ceramics For Use In High Strength Dental Restoratives written by Thomas J. Fleming and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

Scientific And Technical Aerospace Reports

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Author :
language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.