Preparation and Analysis of Ti and Alloyed Ti Surfaces Used in the Evaluation of Biological Response

1987 ◽  
Vol 110 ◽  
Author(s):  
J. Lausmaa ◽  
M. Ask ◽  
U. Rolander ◽  
B. Kasemo
Keyword(s):  
Surface Characterization ◽  
Biological Response ◽  
Anodic Oxide ◽  
Surface Oxide ◽  
Grain Structure ◽  
Two Phase ◽  
Bulk Metal ◽  
Ti Alloys ◽  
Surface Oxides

AbstractThe biocompatibility of Ti and Ti alloys is closely associated with the passivating surface oxide which covers these materials. In this paper results are presented from a broad surface characterization of pure Ti and Ti6A14V alloy surface oxides prepared by thermal oxidation by machining, or by electrochemical procedures (electropolishing and anodic oxidation). The chemical composition of the surface oxide on both materials is mainly TiO2, as shown by XPS, AES, and SIMS analyses. Significant differences exist for both the thermal and anodic oxides, in that the alloying elements are present in the surface oxide of the alloy. TEM and STEM studies show that the microstructure of the anodic oxide films is rather heterogeneous with areas of different porosity which can be correlated with the grain structure of the bulk metals. Oxides on the alloy are even more heterogeneous than on Ti, due to the more complex (two-phase) microstructure of the bulk metal, and also differ in crystallinity. The differences in the surface oxide properties can be expected to lead to differences in the biological response to these two materials. With the alloy, one must consider the risk of Al and/or V dissolution into the biological system.

SURFACE CHARACTERIZATION OF Ni-Ti ALLOY MODIFIED BY ISOTHERMAL OXIDATION

2006 ◽  
Vol 20 (25n27) ◽  
pp. 3573-3578
Author(s):  
HIROKATSU SUGAWARA ◽  
HIROTAKE GOTO ◽  
JUN KOMOTORI
Keyword(s):  
Corrosion Resistance ◽  
Surface Characterization ◽  
Electrochemical Corrosion ◽  
Isothermal Oxidation ◽  
Protective Oxide ◽  
X Ray ◽  
Ti Alloys ◽  
Good Biocompatibility ◽  
Wear Tests

In order to improve the corrosion resistance of Ni - Ti alloys, mechanically polished Ni - Ti alloys discs were subjected to isothermal oxidation (TO) treatment in N 2-20vol.% O 2 at temperatures ranging from 300 to 800°C. TO-treated surfaces were then analyzed by Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive X-ray spectroscopy (EDX), and X-ray electron spectroscopy (XPS). Electrochemical corrosion tests and wear tests were carried out. Ni - Ti alloys exhibited different oxidation behavior depending on the treatment temperatures. An almost Ni free layer was observed on the surface layer of the specimens treated at temperatures 500°C and above. TO-treated specimens showed a higher corrosion resistance compared to that of the untreated sample, and a higher wear resistance. Consequently, TO-treatment produced an almost nickel free smooth protective oxide layer, which might contribute to good biocompatibility.

scholarly journals Chemical and Topographic Analysis of Eight commercially Available Dental Implants

2016 ◽  
Vol 17 (5) ◽  
pp. 354-360 ◽  
Author(s):  
Mogammad Thabit Peck ◽  
Bruno R Chrcanovic
Keyword(s):  
Dental Implants ◽  
Surface Characterization ◽  
Biological Response ◽  
Mean Value ◽  
Surface Chemical ◽  
Implant Surface ◽  
Topographic Analysis ◽  
X Ray ◽  
Surface Topographies

ABSTRACT Background Surface characterization of dental implants allows us to better understand the effects of the implant on the host biological response. In this study, we analyzed and compared these characteristics among implants commercially available in South Africa. Materials and methods Eight implants from different manufacturers were chosen for analysis (Touareg, ICE, (R)Evolutions, Uniti, AnyRidge, MIS, Ivory-QSI, Southern), using scanning electron microscopy (SEM), interferometry, and energy dispersive X-ray spectroscopy to study the surface chemical composition and morphology. Results The results indicate that variations in manufacturer processes result in implant surfaces that are distinctly different from one another. Most implants presented a moderately rough surface with sandblasted-only implant surfaces having a lower mean value of Sa when compared with sandblasted and acidetched surfaces. Carbon contamination was detected on all the implants and that of aluminum on five implant surfaces. Ca and P were detected on the surface of Touareg implants, indicating the manufacturer's attempt to enhance osseointegration. Conclusion The surface of the implants showed a range of chemical, physical properties, and surface topographies. Clinical significance The results indicate that implant surface treatment is not standardized. This may have clinical implications. Further clinical research is required. How to cite this article Peck MT, Chrcanovic BR. Chemical and Topographic Analysis of Eight commercially Available Dental Implants. J Contemp Dent Pract 2016;17(5):354-360.

The Use of Advanced Analytical Techniques for Characterization of the Chemical, Physical, and Crystallographic Nature of a Surface

1973 ◽  
Vol 31 ◽  
pp. 132-133 ◽  
Author(s):  
R. E. Herfert
Keyword(s):  
Surface Characterization ◽  
Analytical Techniques ◽  
X Ray Diffraction ◽  
Depth Of Penetration ◽  
X Ray ◽  
The Past ◽  
Transmission Electron ◽  
Scanning Electron

Studies of the nature of a surface, either metallic or nonmetallic, in the past, have been limited to the instrumentation available for these measurements. In the past, optical microscopy, replica transmission electron microscopy, electron or X-ray diffraction and optical or X-ray spectroscopy have provided the means of surface characterization. Actually, some of these techniques are not purely surface; the depth of penetration may be a few thousands of an inch. Within the last five years, instrumentation has been made available which now makes it practical for use to study the outer few 100A of layers and characterize it completely from a chemical, physical, and crystallographic standpoint. The scanning electron microscope (SEM) provides a means of viewing the surface of a material in situ to magnifications as high as 250,000X.

Structural and Electrical Characterization of Shaped Beam Laser Recrystallized Polysilicon on Amorphous Substrates

1981 ◽  
Vol 4 ◽  
Author(s):  
T. J. Stultz ◽  
J. F. Gibbons
Keyword(s):  
Grain Size ◽  
Electrical Characterization ◽  
Grain Structure ◽  
Electrical Characteristics ◽  
Shaped Beam ◽  
Beam Laser ◽  
Cw Laser ◽  
Amorphous Substrates ◽  
Circular Beam

ABSTRACTStructural and electrical characterization of laser recrystallized LPCVD silicon films on amorphous substrates using a shaped cw laser beam have been performed. In comparing the results to data obtained using a circular beam, it was found that a significant increase in grain size can be achieved and that the surface morphology of the shaped beam recrystallized material was much smoother. It was also found that whereas circular beam recrystallized material has a random grain structure, shaped beam material is highly oriented with a <100> texture. Finally the electrical characteristics of the recrystallized film were very good when measured in directions parallel to the grain boundaries.

Characterization of flow regimes in two phase flow using wavelet analysis

2018 ◽  
Author(s):  
Munzarin Morshed ◽  
Syed Imtiaz ◽  
Mohammad Aziz Rahman
Keyword(s):  
Wavelet Analysis ◽  
Two Phase Flow ◽  
Flow Regimes ◽  
Phase Flow ◽  
Two Phase
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