Measuring Mechanical Properties of Zirconia Dental Crowns by Nanoindentation

2013 ◽  
Vol 591 ◽  
pp. 150-153 ◽  
Author(s):  
Zhao Qiang Meng ◽  
Dan Yu Jiang
Keyword(s):  
Mechanical Properties ◽  
Dental Materials ◽  
Tetragonal Zirconia ◽  
Core Material ◽  
Stiffness Measurement ◽  
High Toughness ◽  
Dental Crowns ◽  
Dental Restorations ◽  
Nanoindentation Testing ◽  
Continuous Stiffness Measurement

Mechanical properties of dental materials are increasingly studied via nanoindentation testing. Due to the excellent mechanical properties, 3-mol%-Yttria-Stabilized Tetragonal Zirconia (3Y-TZP) has become an attractive high-toughness core material for fixed dental restorations. In this paper, the mechanical properties of 3Y-TZP were studied by nanoindentation. The continuous stiffness measurement (CSM) and the single load/unload cycle test controlled by displacement and load respectively were performed with a Berkovich indenter.

CAD/CAM Zirconia for Dental Application

2013 ◽  
Vol 320 ◽  
pp. 505-511
Author(s):  
Ning Li ◽  
Zhi Kai Wu ◽  
Chao Jian ◽  
Wan Qian Zhao ◽  
Jia Zhen Yan
Keyword(s):  
Mechanical Properties ◽  
Low Temperature ◽  
Key Words ◽  
20Th Century ◽  
Dental Materials ◽  
Tetragonal Zirconia ◽  
Dental Application ◽  
Cad Cam ◽  
Low Temperature Aging ◽  
Temperature Aging

During the 20th century, both dental materials and dental technologies for the fabrication of dental prosthesis progressed remarkably. Owing to the increased demand of safety and aesthetics, 3 mol% yttria stabilized tetragonal zirconia polycrystalline has been recently introduced in prosthetic dentistry for the fabrication of crowns and fixed partial dentures, in combination with CAD/CAM technique. This greatly changed the conventional dental laboratory work which is labor-intensive and experience-dependent. This review mainly introduced the state of dental zirconia and the application of CAD/CAM technology in dentistry. Key words: Dental Zirconia; CAD/CAM Technique; Mechanical Properties; Transformation Toughing; Low Temperature Aging;

scholarly journals Morphology and Mechanical Properties of 3Y-TZP Nanofiber Mats

Nanomaterials ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 2097
Author(s):  
Alexander I. Tyurin ◽  
Vyacheslav V. Rodaev ◽  
Svetlana S. Razlivalova ◽  
Viktor V. Korenkov ◽  
Andrey O. Zhigachev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Phase Composition ◽  
Calcination Temperature ◽  
Tetragonal Zirconia ◽  
Calcination Temperatures ◽  
Nanoindentation Testing ◽  
Average Grain Size ◽  
Nanofiber Mats ◽  
Morphology And Mechanical Properties

The mats of yttria-stabilized tetragonal zirconia nanofibers were prepared using electrospinning. The effect of calcination temperature in the range of 600–1200 °C on their microstructure, phase composition and mechanical properties was investigated. Phase composition of the nanofibers did not change in all ranges of the calcination temperatures, while the average grain size increased from 8 to 39 nm. Nanoindentation testing of the mats showed a decrease in the hysteresis loop energy in samples with higher calcination temperature. Hardness and the elastic modulus measured with the indentation technique were the highest for the mats calcined at 900 °C.

Mechanical Properties of Zirconia/Alumina Nano-Composite after Soaking in Various Water-Based Conditions

2006 ◽  
Vol 309-311 ◽  
pp. 1219-1222 ◽  
Author(s):  
Seiji Ban ◽  
Masahiro Nawa ◽  
Y. Suehiro ◽  
H. Nakanishi
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Tetragonal Zirconia ◽  
Flexure Strength ◽  
Nano Composite ◽  
Dental Restorations ◽  
Dental Restoratives ◽  
All Ceramic ◽  
Water Based ◽  
Before And After

Yttria stabilized tetragonal zirconia polycrystals (Y-TZP) have been applied to dental crown and bridges. Whereas, to further improve its mechanical strength, the zirconia/alumina nano-composite stabilized with cerium oxide (Ce-TZP/Al2O3 nano-composite) was developed. In the present study, biaxial flexure strength, fracture toughness and hardness were determined before and after soaking in water-based conditions and the possibility of application to all ceramic dental restorations was discussed. In comparison to Y-TZP, Ce-TZP/Al2O3 nano-composite has quite high flexure strength and fracture toughness along with satisfied durability for LTAD in various water-based conditions encountered in dentistry. Therefore, it is concluded that the nano-composite can be safely applied to dental restoratives such as all-ceramic bridges.

A Review of the Low-Temperature Degradation of Dental Zirconia

2014 ◽  
Vol 606 ◽  
pp. 85-88
Author(s):  
Mohamed M. Aboras ◽  
Kai Yuan Theng ◽  
Andanastuti Muchtar ◽  
Che Husna Azhari ◽  
Norziha Yahaya
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Low Temperature ◽  
Tetragonal Zirconia ◽  
Dental Restoration ◽  
Restorative Material ◽  
Dental Restorations ◽  
Biological Compatibility ◽  
Oral Environment ◽  
Dental Restorative

The use of tetragonal zirconia as a dental restorative material has recently increased because of its unique mechanical and optical properties, as well as high biological compatibility with the oral cavity environment. However, the mechanical properties of zirconia can be severely degraded, which leads to the failure of dental restorations. This review focuses on the low-temperature degradation of dental zirconia and its effects on the properties of zirconia and on the oral environment. The purpose is to show the importance of this negative phenomenon and suggest guidelines for minimizing the aging of zirconia that is used as a dental restoration material.

Type of Failure of Zirconia-Based Ceramics in Dental Laboratory in Misurata, Libya

2014 ◽  
Vol 575 ◽  
pp. 22-25
Author(s):  
Mohamed M. Aboras ◽  
A. Muchtar ◽  
C.H. Azhari ◽  
N. Yahaya
Keyword(s):  
Mechanical Properties ◽  
Core Material ◽  
Restorative Material ◽  
Suitable Material ◽  
Dental Restorations ◽  
Type Of Failure ◽  
Dental Restorative ◽  
Failure Types

Zirconia (ZrO2) is used to fix restorations as a core material because of its mechanical properties, aesthetics, and compatibility. This study aims to analyze the failure types in ZrO2-based restoration fabricated in a dental laboratory in Misurata, Libya. Data were collected from laboratory records for a 30-day period with follow-up for five months. About 6% of the total restorations had defects with different percentages, 46% of which were fractures, 29% of which had weak bonding between ZrO2frameworks and veneers, 18% of which had cracks, and 7% of which had shade defects. Although ZrO2is a suitable material for dental restorations, defects may occur and lead to the failure of dental restorations. A thorough study is necessary to analyze the cause of failurein zirconia-based restorationsand to improve the properties to produce a versatile dental restorative material.

ZrO2 Pre-Sintered Blocks (3%mol-Y2O3) with Color Gradient for Dental Prostheses

2018 ◽  
Vol 930 ◽  
pp. 57-62
Author(s):  
Rodrigo Xavier de Freitas ◽  
Claudinei dos Santos ◽  
Bruno Xavier de Freitas ◽  
Bruno Galvão Simba
Keyword(s):  
Mechanical Properties ◽  
Optical Properties ◽  
Tetragonal Zirconia ◽  
Cervical Region ◽  
Mechanical Resistance ◽  
Metal Free ◽  
Dental Restorations ◽  
Dental Prostheses ◽  
Aesthetic Results ◽  
Color Gradient

In dentistry, metal-free ceramic systems are used to improve optical properties in dental restorations. Ceramics based on tetragonal zirconia ZrO2-Y2O3 are used in the manufacturing of dental prostheses for being biocompatible and for presenting proper mechanical and optical properties. Most of tetragonal zirconia blocks are commercialized in one only hue, which difficult the achievement of high aesthetic performance due to the tooth’s polychromatic characteristics. This work proposes to obtain tetragonal zirconia blocks fabricated by uniaxial cold pressing in different hues which could provide ceramic prostheses with better aesthetic results in less time. Zirconia blocks in two different colors were produced and characterized for their physical properties and mechanical resistance. The colors difference between the layers was obtained by using different amounts of Fe2O3. Ceramics with relative density superior to 99% were obtained by sintering the materials at 1530oC for 120 minutes. The mechanical properties evaluated indicated hardness close to 1270HV and fracture toughness of 7MPa.m1/2. Blocks with different hues may be an alternative in order to favor the aesthetics in the cervical region and decrease the amount of ceramic veneering.

Composite Middle Lamella Hardness and Young’s Modulus of Artificial Dried Spruce Wood by Nanoindentation

2016 ◽  
Vol 827 ◽  
pp. 320-323
Author(s):  
Zdeněk Prošek ◽  
Jaroslav Topič ◽  
Pavel Tesárek ◽  
Václav Nežerka ◽  
Vlastimil Králik
Keyword(s):  
Mechanical Properties ◽  
Young’S Modulus ◽  
Measurement Technique ◽  
Middle Lamella ◽  
Indentation Modulus ◽  
Drying Process ◽  
Stiffness Measurement ◽  
Micromechanical Properties ◽  
Spruce Wood ◽  
Continuous Stiffness Measurement

The presented article deals with the influence of the drying process on the micro-mechanical properties of the composite middle lamella. The purpose of the composite middle lamella is to connecti individual cells. Micromechanical properties were obtained using nanoindentation and directly continuous stiffness measurement technique. Indentation modulus of tested samples was 11.45 GPa for natural dried wood and 12.51 GPa for artificial dried wood.

Feasibility Study of Zirconia Waste Recycling Obtained during the Machining of Single and Multiple Dental Prosthesis

2016 ◽  
Vol 881 ◽  
pp. 387-391
Author(s):  
Yankel B.F. Silva ◽  
Wilson Acchar ◽  
Vamberto Monteiro Silva
Keyword(s):  
Mechanical Properties ◽  
Feasibility Study ◽  
Zirconium Oxide ◽  
Dental Materials ◽  
Physical And Mechanical Properties ◽  
Waste Recycling ◽  
Zirconia Ceramic ◽  
Powder Form ◽  
Recycle Material ◽  
Dental Crowns

Zirconia ceramic stabilized with 3% yttria (3Y - TZP) is the most used ceramic dental materials. During the machining of zirconia blocks in the laboratory to prepare the various types of prostheses, much of the material is lost in powder form, which is subsequently discarded. This study investigates the possibility to recycling of zirconium oxide powder obtained during milling of dental crowns and bridges. Uniaxial and isostatic pressed samples were prepared, sintered and compared to the commercial material. The results indicated that the isostatic pressed samples shows good physical and mechanical properties, comparable to the commercial material, demonstrating the viability to use this recycle material in the same process.

scholarly journals Mechanical Properties of Polymer-Based Blanks for Machined Dental Restorations

Materials ◽  
2021 ◽  
Vol 14 (23) ◽  
pp. 7293
Author(s):  
Lucian Toma Ciocan ◽  
Jana Ghitman ◽  
Vlad Gabriel Vasilescu ◽  
Horia Iovu
Keyword(s):  
Mechanical Properties ◽  
Dental Materials ◽  
Clinical Problem ◽  
Morphological Properties ◽  
Dental Restorations ◽  
Wide Range ◽  
Cad Cam ◽  
Treatment Technologies ◽  
Restorative Dental Materials ◽  
Hybrid Ceramic

The tremendous technological and dental material progress led to a progressive advancement of treatment technologies and materials in restorative dentistry and prosthodontics. In this approach, CAD/CAM restorations have proven to be valuable restorative dental materials in both provisional and definitive restoration, owing to multifarious design, improved and highly tunable mechanical, physical and morphological properties. Thus far, the dentistry market offers a wide range of CAD/CAM restorative dental materials with highly sophisticated design and proper characteristics for a particular clinical problem or multiple dentistry purposes. The main goal of this research study was to comparatively investigate the micro-mechanical properties of various CAD/CAM restorations, which are presented on the market and used in clinical dentistry. Among the investigated dental specimens, hybrid ceramic-based CAD/CAM presented the highest micro-mechanical properties, followed by CAD/CAM PMMA-graphene, while the lowest micro-mechanical features were registered for CAD/CAM multilayered PMMA.

Sign in / Sign up

Export Citation Format

Share Document