Material fundamentals and clinical performance of plasma-sprayed hydroxyapatite coatings: A review

2001 ◽  
Vol 58 (5) ◽  
pp. 570-592 ◽  
Author(s):  
Limin Sun ◽  
Christopher C. Berndt ◽  
Karlis A. Gross ◽  
Ahmet Kucuk
Keyword(s):  
Clinical Performance ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Phases Transformations in Laser Treated Hydroxyapatite Coatings

1998 ◽  
Author(s):  
X. Ranz ◽  
T. Aslanian ◽  
L. Pawlowski ◽  
L. Sabatier ◽  
R. Fabbro
Keyword(s):  
Titanium Alloy ◽  
Sample Surface ◽  
Optical Microscope ◽  
Thermal Fields ◽  
Hydroxyapatite Coatings ◽  
Titanium Alloy Substrate ◽  
Plasma Sprayed ◽  
Different Content ◽  
Kinetics Of ◽  
Xrd Method

Abstract The hydroxyapatite Ca10(PO4)6OH2 (HAP) was plasma sprayed onto titanium alloy substrate. The samples having thickness of about 150 µm ware sprayed in a way to obtain two different content of crystalline HAP: 25 an 30 %. The coatings ware subsequently submitted to laser treatment with the CO2 laser. The treatment was carried out with different laser powers and scanning velocities and resulting thereof sample surface temperatures and the kinetics of the thermal fields ware monitored with a pyrometer. The XRD method enabled verification of the crystallinity state of HAP, content of amorphous calcium phosphate and the content of foreign phases. Optical microscope was used to check the microstructure and the depth of laser modified zone.

Interface Characterization of Different Apatite Coatings

1998 ◽  
Author(s):  
N. Antolotti ◽  
S. Bertini ◽  
A. Scrivani ◽  
C. Fanara ◽  
F. Rustichelli ◽  
...  
Keyword(s):  
Metal Surface ◽  
Calcium Oxide ◽  
Chemical Reactions ◽  
Metallic Substrate ◽  
Metal Interface ◽  
Interface Characterization ◽  
Hydroxyapatite Coatings ◽  
Plasma Sprayed

Abstract The decomposition of bioactive plasma sprayed apatite layers and the weakness of their interface with the metallic substrate limit the longevity of orthopaedic prostheses. Analysis of the coating and of the metal-apatite different techniques (EDS, XPS, IR) indicates alterations of the apatite composition which can be related to several chemical reactions occurring either in the plasma or on the surface of the implant. EDS shows a calcium-rich layer on the apatite side of the interface whereas after dissolution of the apatite, XPS indicates that phosphorus atoms are incorporated in the metal surface. Depending on the rate of decomposition, calcium oxide may possibly form and weaken the apatite-metal interface. Fluorohydroxyapatite coating, have proven to decompose less and differently and to be more effective than hydroxyapatite coatings.

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