Effect of Nanocrystallized Hydroxyapatite Coating on Bone Healing Evaluated by Synchrotron Radiation Diffraction

2015 ◽  
Vol 1088 ◽  
pp. 481-486
Author(s):  
Abdelilah Benmarouane ◽  
Helene Citterio ◽  
Pierre Millet ◽  
Thomas Buslaps ◽  
Alain Lodini ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Spatial Organization ◽  
High Energy ◽  
Bone Maturation ◽  
Bone Implant ◽  
Synchrotron Radiation Diffraction ◽  
Before And After ◽  
New Type ◽  
Non Destructive ◽  
Uncoated Titanium

The properties of the interface between biomaterials and the host tissue play an important role for the process of successful adaptation of implants. Extensive research has focused on shortening the time of osseointegration by modifying the surface in adding a coating such as hydroxyapatite (HAp). We have developed a new type of biocompatible nanohydroxyapatite (n-HAp) coatings, which are characterized before and after deposit on a Ti-6Al-4V substrate using neutron diffraction and scanning electron microscopy. Three months after the implantation in the sheep tibias, high-energy synchrotron radiation (ID15B, ESRF, Grenoble, France) diffraction studies of the cortical bone identify that the c-axes of HAp are preferentially oriented in the direction of the stresses that bone usually withstands. This non destructive analysis of the bone-implant interface proves that bone maturation is achieved successfully with this novel n-HAp coating and demonstrates that the mineralization is completed without spatial organization. None of these findings are obtained with uncoated titanium alloys. The presence of this n-HAp coating on Ti-6Al-4V substrate is decisive in obtaining this mature bone at the interface.

scholarly journals In situ synchrotron radiation monitoring of phase transitions during microwave heating of Al–Cu–Fe alloys

2008 ◽  
Vol 23 (1) ◽  
pp. 170-175 ◽  
Author(s):  
Sébastien Vaucher ◽  
Radu Nicula ◽  
José-Manuel Català-Civera ◽  
Bernd Schmitt ◽  
Bruce Patterson
Keyword(s):  
Phase Transitions ◽  
Synchrotron Radiation ◽  
Microwave Heating ◽  
Nanocrystalline Alloy ◽  
Time Resolved ◽  
Microwave Exposure ◽  
Synchrotron Radiation Diffraction ◽  
Before And After ◽  
Fe Alloys

The effect of rapid microwave heating has so far been evaluated mainly by comparing the state of materials before and after microwave exposure. Yet, further progress critically depends on the ability to follow the evolution of materials during ultrafast heating in real time. We describe the first in situ time-resolved monitoring of solid-state phase transitions during microwave heating of metallic powders using wide-angle synchrotron radiation diffraction. Single-phase Al–Cu–Fe quasicrystal powders were obtained by microwave heating of nanocrystalline alloy precursors at 650 °C in <20 s.

Effect of Coating with Hydroxyapatite on the Bonding of Bone to Implant

2012 ◽  
Vol 706-709 ◽  
pp. 1661-1666
Author(s):  
Abdelilah Benmarouane ◽  
Pierre Millet ◽  
Thomas Buslaps ◽  
Alain Lodini ◽  
Veijo Honkimäki
Keyword(s):  
Synchrotron Radiation ◽  
Spatial Resolution ◽  
Orthopaedic Surgery ◽  
High Spatial Resolution ◽  
High Energy ◽  
Direct Connection ◽  
X Ray Diffraction ◽  
X Ray ◽  
Natural Bone ◽  
Non Destructive

The aim of the present study was to study the interface implant-bone by synchrotron radiation, the implant has two faces the first one coated with hydroxyapatite and the second uncoated. In orthopaedic surgery, Titanium (Ti-Al-4V) implants are currently coated with hydroxyapatite (HAp), Ca10(PO4)6(OH)2, in order to obtain a stable and functional direct connection between the bone and the implant. At the implant-bone interface, the new bone reconstituted after two months of implantation must have the same properties like the natural bone in order to accept the implant. Therefore we studied the texture of the reconstituted bone crystals at the interface applying non destructive x-ray diffraction. The required high spatial resolution was achieved utilizing high-energy synchrotron radiation on ID15 at ESRF in Grenoble, France.

Study of the crystal device for deflecting high-energy proton beams using synchrotron radiation diffraction

2017 ◽  
Vol 62 (3) ◽  
pp. 370-373 ◽  
Author(s):  
A. A. Kaloyan ◽  
S. A. Tikhomirov ◽  
K. M. Podurets ◽  
V. A. Maisheev ◽  
Yu. E. Sandomirskiy ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
High Energy ◽  
High Energy Proton ◽  
Proton Beams ◽  
Energy Proton ◽  
Synchrotron Radiation Diffraction

Spatial Distribution of Metal Ions in Spruce Wood by Synchrotron Radiation Microbeam X-Ray Fluorescence Analysis

Holzforschung ◽  
1999 ◽  
Vol 53 (5) ◽  
pp. 474-480 ◽  
Author(s):  
Annica Berglund ◽  
Harald Brelid ◽  
Anders Rindby ◽  
Per Engström
Keyword(s):  
Synchrotron Radiation ◽  
Metal Ions ◽  
Metal Ion ◽  
Fluorescence Analysis ◽  
X Ray ◽  
Metal Ion Analysis ◽  
Before And After ◽  
Non Destructive

Summary The possibility of using synchrotron radiation microbeam X-ray fluorescence (μ -XRF) for the determination of the morphological distribution of inorganic elements in wood has been investigated. A number of samples were analyzed and some of the results are presented in this paper. The new application of the method showed good results and it was concluded that the technique is useful for specific in situ metal ion analysis of wood. One of its special advantages is that it is a non-destructive method, which may allow analysis of the same sample before and after a chemical treatment. This study shows the natural distribution of a selection of metal ions in wood. Some differences in the distribution and amount of certain metals could also be observed in a sample that had been subjected to treatment with an EDTA-solution.

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