scholarly journals Considerations on determining the castability of dental casting alloys

2018 ◽  
Vol 178 ◽  
pp. 04009
Author(s):  
Cristian Deac ◽  
Alina Gligor ◽  
Lucian Tarnu
Keyword(s):  
Titanium Alloy ◽  
Critical Analysis ◽  
Casting Machine ◽  
Current Paper ◽  
Metallic Materials ◽  
Dental Alloys ◽  
Casting Alloys ◽  
And Performance ◽  
Materials Used ◽  
Dental Casting Alloys

Castability is, along with biocompatibility, one of the most important characteristics of metallic materials used for dental prosthetic applications. In addition, the characteristics and performance of the employed casting machine are also decisive for the end result of the casting, especially when dealing with titanium or a titanium alloy. Starting from a critical analysis of the existing methods for determining the castability of dental alloys, the current paper presents a new method (and associated pattern) for determining the castability. Also, given the castability’s dependence on the type of casting machine, the paper includes an analysis of suitable casting machines and suggests some possible improvements.

Biocompatibility of Dental Casting Alloys

2002 ◽  
Vol 13 (1) ◽  
pp. 71-84 ◽  
Author(s):  
Werner Geurtsen
Keyword(s):  
Metal Ions ◽  
Pure Titanium ◽  
Orthodontic Appliances ◽  
Metallic Materials ◽  
Dental Casting ◽  
Periodontal Tissues ◽  
Casting Alloys ◽  
Dental Restorations ◽  
Dental Casting Alloys

Most cast dental restorations are made from alloys or commercially pure titanium (cpTi). Many orthodontic appliances are also fabricated from metallic materials. It has been documented in vitro and in vivo that metallic dental devices release metal ions, mainly due to corrosion. Those metallic components may be locally and systemically distributed and could play a role in the etiology of oral and systemic pathological conditions. The quality and quantity of the released cations depend upon the type of alloy and various corrosion parameters. No general correlation has been observed between alloy nobility and corrosion. However, it has been documented that some Ni-based alloys, such as beryllium-containing Ni alloys, exhibit increased corrosion, specifically at low pH. Further, microparticles are abraded from metallic restorations due to wear. In sufficient quantities, released metal ions—particularly Cu, Ni, Be, and abraded microparticles—can also induce inflammation of the adjacent periodontal tissues and the oral mucosa. While there is also some in vitro evidence that the immune response can be altered by various metal ions, the role of these ions in oral inflammatory diseases such as gingivitis and periodontitis is unknown. Allergic reactions due to metallic dental restorations have been documented. Ni has especially been identified as being highly allergenic. Interestingly, from 34% to 65.5% of the patients who are allergic to Ni are also allergic to Pd. Further, Pd allergy always occurrs with Ni sensitivity. In contrast, no study has been published which supports the hypothesis that dental metallic materials are mutagenic/genotoxic or might be a carcinogenic hazard to man. Taken together, very contradictory data have been documented regarding the local and systemic effects of dental casting alloys and metallic ions released from them. Therefore, it is of critical importance to elucidate the release of cations from metallic dental restorations in the oral environment and to determine the biological interactions of released metal components with oral and systemic tissues.

Effect of Heat Treatments on Mechanical Properties and Fatigue Resistance of Ti-35Nb Alloy Used as Biomaterial

2010 ◽  
Vol 636-637 ◽  
pp. 68-75 ◽  
Author(s):  
Alessandra Cremasco ◽  
Itamar Ferreira ◽  
R. Caram
Keyword(s):  
Titanium Alloy ◽  
Fatigue Resistance ◽  
Room Temperature ◽  
The Other ◽  
Fatigue Properties ◽  
Metallic Materials ◽  
Rapid Cooling ◽  
Materials Used ◽  
Orthopedic Applications ◽  
35Nb Alloy

Titanium alloys form the most versatile class of metallic materials used as biomaterials. Among them it is foreseen that the  type titanium alloy will be a prominent one for orthopedic applications. Aim of the present work was to prepare and characterize a  type titanium alloy containing 35 wt.% Nb. Samples were cooled from the  phase temperatures at different rates. This work includes the effects of heat treatment on the microstructure and hardness, tensile and fatigue properties in air at room temperature. The results showed that microstructure of slow cooled samples are formed by precipitates of  and  phases in a  matrix. After rapid cooling, the microstructure consists of  phase and ” martensite. Mechanical testing showed that the elastic modulus and Vickers hardness of slow cooled samples were significantly higher than that obtained by rapid cooling. On the other hand, it was observed that slow cooled samples showed higher tensile strength and lower ductility. The rapid cooled sample showed fatigue resistance higher than that of slow cooled samples.

Joint Quality Assessment of Three Different Laser Welded Dental Alloys

2014 ◽  
Vol 216 ◽  
pp. 63-66 ◽  
Author(s):  
Lavinia Ardelean ◽  
Lucien Reclaru ◽  
Cristina Bortun ◽  
Laura Cristina Rusu
Keyword(s):  
Thermal Conductivity ◽  
Welded Joints ◽  
Dental Alloys ◽  
Scanning Electronic Microscopy ◽  
Electronic Microscopy ◽  
Casting Alloys ◽  
Microhardness Testing ◽  
Joint Quality ◽  
Dental Casting Alloys

The aim of this study is to assess the quality of laser welded joints, by different methods such as: scanning electronic microscopy, metallography, microhardness testing, spectrographic and radiographic analyses. The alloys assessed are a titanium-based alloy used in manufacturing prefabricated pieces for implantology, a standard AuPd alloy for the metallo-ceramic technique and a Cr-Co-Mo alloy used for manufacturing the metallic components of partial dentures. The conclusion of the testing is that laser welded joints are generally mechanically satisfactory. Laser is best suitable to weld titanium and its alloys because they have higher rates of laser beam absorption and lower thermal conductivity than other dental casting alloys.

scholarly journals Nanoengineering in biomedicine: Current development and future perspectives

2020 ◽  
Vol 9 (1) ◽  
pp. 700-715 ◽  
Author(s):  
Wei Jian ◽  
David Hui ◽  
Denvid Lau
Keyword(s):  
Molecular Dynamics ◽  
Research And Development ◽  
Molecular Dynamics Simulations ◽  
Material Properties ◽  
Biomedical Applications ◽  
Metallic Materials ◽  
Future Perspectives ◽  
Current Development ◽  
Materials Used ◽  
Dynamics Simulations

AbstractRecent advances in biomedicine largely rely on the development in nanoengineering. As the access to unique properties in biomaterials is not readily available from traditional techniques, the nanoengineering becomes an effective approach for research and development, by which the performance as well as the functionalities of biomaterials has been greatly improved and enriched. This review focuses on the main materials used in biomedicine, including metallic materials, polymers, and nanocomposites, as well as the major applications of nanoengineering in developing biomedical treatments and techniques. Research that provides an in-depth understanding of material properties and efficient enhancement of material performance using molecular dynamics simulations from the nanoengineering perspective are discussed. The advanced techniques which facilitate nanoengineering in biomedical applications are also presented to inspire further improvement in the future. Furthermore, the potential challenges of nanoengineering in biomedicine are evaluated by summarizing concerned issues and possible solutions.

scholarly journals Dental casting alloys behaviour during power toothbrushing with toothpastes of various abrasivities. Part II: corrosion and ion release

2008 ◽  
Vol 19 (9) ◽  
pp. 3015-3019 ◽  
Author(s):  
C. Molina ◽  
Ll. Nogués ◽  
J. Martinez-Gomis ◽  
M. Peraire ◽  
J. Salsench ◽  
...  
Keyword(s):  
Ion Release ◽  
Dental Casting ◽  
Casting Alloys ◽  
Dental Casting Alloys

Relationship among Microstructure, Defects and Performance of Ti60 Titanium Alloy Fabricated by Laser Solid Forming

2014 ◽  
Vol 43 (3) ◽  
pp. 548-552 ◽  
Author(s):  
Jing Chen ◽  
Rui Zhang ◽  
Qiang Zhang ◽  
Jieqiong Yang ◽  
Weidong Huang
Keyword(s):  
Titanium Alloy ◽  
Laser Solid Forming ◽  
And Performance

A New Aluminium Silicon-Boron Nitride Abradable for Compressor Components

1998 ◽  
Author(s):  
K. Boddenberg ◽  
B. Kock ◽  
M. Dorfman ◽  
L. Russo ◽  
M. Nestler
Keyword(s):  
Boron Nitride ◽  
Raw Materials ◽  
Electrical Energy ◽  
Air Separation ◽  
Energy Costs ◽  
Performance Improvements ◽  
And Performance ◽  
Materials Used ◽  
Abradable Coatings ◽  
Optimization And Performance

Abstract Air separation plants use centrifugal compressors where air and electrical energy are the only raw materials used in the production process. So energy costs play a crucial role and the compressors are heavily penalized when guaranteed performance levels are not achieved. In order to better generate performance, abradable coatings, previously used in the gas turbine industry, have been designed into turbocompressors. This paper will show the optimization and performance improvements of a new aluminium silicon-boron nitride material.

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