scholarly journals Comparative characteristics of osseointegration processes of the calcium phosphate coating implants and implants with germanium enriched calcium phosphate coatings

2017 ◽  
Vol 24 (4) ◽  
pp. 38-42
Author(s):  
Elena A. Zelichenko ◽  
V. V Guzeev ◽  
Ya. B Koval’skaya ◽  
O. A Gurova ◽  
T. I Guzeeva
Keyword(s):  
Comparative Analysis ◽  
Calcium Phosphate ◽  
Surface Treatment ◽  
Bone Tissue Regeneration ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Chemical Surface ◽  
Phosphate Coatings ◽  
Study Results ◽  
Calcium Phosphate Coatings

Introduction. Osseointegration process exerts considerable influence on the term of biological fixation of the implants and is an important parameter that is to be focused on at the implant placement. Purpose: to conduct a comparative analysis of the osseointegration of the titanium alloy implants with different coatings for the determination of the optimum coating compound for osteogenesis. Materials and methods. Comparative analysis of osteogenic properties of the implants with thermal chemical surface treatment, calcium phosphate coating and Germanium enriched (3% and 5%) calcium phosphate coatings applied by electrochemical technique was performed. Implant recipients were 29 not pedigree male cats aged 1.5 to 4.0 years with 2500 to 3400 g body weight. Experimental animals were euthanized in 90 days after surgical intervention. Results. Histological study results showed that bone tissue regeneration was most active when implants with higher level (5%) of Germanium in calcium phosphate coating were used. Calcium phosphate coatings and Germanium enriched ones showed better osseointegration as compared to the implants with thermal chemical surface treatment.

scholarly journals Comparative Characteristics of Osseointegration Processes of the Calcium Phosphate Coating Implants and Implants with Germanium Enriched Calcium Phosphate Coatings

2017 ◽  
pp. 38-42
Author(s):  
E. A. Zelichenko ◽  
V. V. Guzeev ◽  
Ya. B. Koval’skaya ◽  
O. A. Gurova ◽  
T. I. Guzeeva
Keyword(s):  
Comparative Analysis ◽  
Calcium Phosphate ◽  
Surface Treatment ◽  
Bone Tissue Regeneration ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Chemical Surface ◽  
Phosphate Coatings ◽  
Study Results ◽  
Calcium Phosphate Coatings

Introduction.Osseointegration process exerts considerable influence on the term of biological fixation of the implants and is an important parameter that is to be focused on at the implant placement.Purpose: to conduct a comparative analysis of the osseointegration of the titanium alloy implants with different coatings for the determination of the optimum coating compound for osteogenesis.Materials and methods. Comparative analysis of osteogenic properties of the implants with thermal chemical surface treatment, calcium phosphate coating and Germanium enriched (3% and 5%) calcium phosphate coatings applied by electrochemical technique was performed. Implant recipients were 29 not pedigree male cats aged 1.5 to 4.0 years with 2500 to 3400 g body weight. Experimental animals were euthanized in 90 days after surgical intervention.Results.Histological study results showed that bone tissue regeneration was most active when implants with higher level (5%) of Germanium in calcium phosphate coating were used. Calcium phosphate coatings and Germanium enriched ones showed better osseointegration as compared to the implants with thermal chemical surface treatment.

Ca/P Ratio and Biocompatibility of Hydroxyapatite Coatings

1998 ◽  
Author(s):  
P. Frayssinet ◽  
F. Tourenne ◽  
N. Rouquet ◽  
I. Primout ◽  
D. Mathon
Keyword(s):  
Calcium Phosphate ◽  
Coating Thickness ◽  
Small Difference ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Rapid Degradation ◽  
Hydroxyapatite Coatings ◽  
Phosphate Coatings ◽  
The Mean ◽  
Calcium Phosphate Coatings

Abstract The decomposition of HA during plasma-spraying can lead to the appearance of calcium oxide (CaO) in the calcium phosphate coatings and an increase of the Ca/P ratio (> 1.67). Rehydration can cause an increase in the pH of the extracellular fluids in close vicinity to the coating and rapid degradation of its thickness. Metal cylinders coated with HA were implanted in rabbit condyles for two months and analyzed by histology to evaluate the effect of the presence of CaO in the coatings during early implantation. Three groups of coatings containing different amounts of CaO: 0.2, 0.5, and 0.9% were implanted . The mean coating thickness was measured on five different sites randomly chosen on each section. The percentage of the coating perimeter in contact with newly farmed bone tissue was also measured. A very small difference in coating thickness was observed between the 0.5% group and the two others. The percentage of coating perimeter in contact with the bone increased with the CaO content. These results show that CaO contamination of the calcium phosphate coating does not impair integration and does not increase degradation during the early stages of implantation.

Calcium Phosphate Coating on Titanium by RF Magnetron Sputtering

2012 ◽  
pp. 223-233
Author(s):  
Takayuki Narushima ◽  
Kyosuke Ueda
Keyword(s):  
Calcium Phosphate ◽  
Magnetron Sputtering ◽  
Rf Magnetron Sputtering ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Metallic Biomaterials ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

In this chapter, the authors discuss the fabrication and properties of calcium phosphate coatings on titanium (Ti) by radio-frequency (RF) magnetron sputtering. First, they address the necessity of surface modification of metallic biomaterials and the effectiveness of calcium phosphate coating. Next, they briefly review the processes used in the application of calcium phosphate coatings and present the effect of sputtering parameters on the phase and deposition rates of these coatings. Finally, the chapter discusses the performance of amorphous and crystalline (oxyapatite) calcium phosphate coatings on Ti based on in vitro and in vivo evaluations.

Mechanical Properties of Calcium Phosphate Coatings Produced by Method of RF-Magnetron Sputtering on Bioinert Alloys

2014 ◽  
Vol 1013 ◽  
pp. 188-193 ◽  
Author(s):  
Kseniya Kulyashova ◽  
Yuri P. Sharkeev ◽  
Aizhan Sainova
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Calcium Phosphate ◽  
Magnetron Sputtering ◽  
Adhesion Strength ◽  
Rf Magnetron Sputtering ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

Results of research of mechanical properties of calciumphosphate coatings produced by the method radio frequency magnetron sputtering on bioinert alloys of titanium, zirconium and were presented. Calcium phosphate coatings show high value of adhesion strength to bioinert metal surface. Calcium phosphate coating on titanium-niobium alloy surface shows the highest value of adhesion strength. Mechanical properties of a composite material based on bioinert alloy and calcium phosphate coating are higher than properties of the components of composite material separately.

scholarly journals Investigation of the adhesion properties of calcium-phosphate coating to titanium substrate with regards to the parameters of high-frequency magnetron sputtering

2020 ◽  
Vol 22 (2) ◽  
Author(s):  
Aidar K. Kenzhegulov ◽  
Axaule A. Mamaeva ◽  
Alexander V. Panichkin ◽  
Konstantin A. Prosolov ◽  
Anna Brończyk ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Magnetron Sputtering ◽  
High Frequency ◽  
Titanium Substrate ◽  
Specific Power ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Adhesion Properties ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

Purpose: The main goal of the work was to find the interconnection between the high-frequency magnetron sputtering parameters and the adhesion properties of CaP coatings formed on the surface of titanium substrate. Methods: Calcium-phosphate coatings, similar in composition to hydroxyapatite, were generated by high-frequency magnetron sputtering on titanium substrate at different values of high-frequency specific power over times of one and two hours. Afterwards, the generated coatings were studied using the method of X-ray phase analysis, and sclerometric tests (scratch test) were carried out. The adhesion strength of the deposited coatings was tested for different coating thicknesses from 0.45 to 1.1 × 10–3 mm. Results: According to the results of sclerometry, it was found that with an increase in the high-frequency specific power of plasma to 3.15 W/cm2, the adhesion strength of the calcium-phosphate coating also increases. For all the coatings, the critical loads at which the coating completely exfoliated from the substrate were determined. Conclusions: According to the research results, the most optimal conditions for obtaining high-adhesive calcium-phosphate coatings were determined.

scholarly journals Experience with the use of bioactive calcium phosphate-coated implants in multicomponent traumatic damage to the hip joint

2020 ◽  
Vol 27 (3) ◽  
pp. 67-72
Author(s):  
Alexey A. Grin ◽  
Alexander A. Markov ◽  
Anastasiya V. Danilova ◽  
Konstantin S. Sergeev
Keyword(s):  
Calcium Phosphate ◽  
Femoral Neck ◽  
Hip Joint ◽  
Functional Results ◽  
Calcium Phosphate Coating ◽  
Phosphate Coating ◽  
Phosphate Coatings ◽  
Neck Fracture ◽  
The Right ◽  
Calcium Phosphate Coatings

Objective. To study the effectiveness of using implants with a bioactive calcium-phosphate coating on the example of treating a patient with combined fractures of the acetabulum and the neck of the femur. Materials and methods. A 52-year-old patient, injured as a result of a traffic accident with multicomponent damage to the right hip joint (transcervical fracture of the femoral neck and a high two-column fracture of the acetabulum). Osteosynthesis of the femoral neck fracture is made by three cannulated screws with a calcium-phosphate coating (patent of the RU No. 81427). For the osteosynthesis of the acetabular fracture, a reconstructive plate with a calcium-phosphate coating was used (patent of the RU No. 113945). Results. Despite the heavy, multi-component destruction of the hip joint, consolidation of the fractures ensued. The remote result is tracked for 10 years. On the score scale of the functional results Harris 89 points, the result is rated as good. The conclusion. The use of imantates with bioactive calcium-phosphate coatings from hydroxyapatite promotes activation of reparative processes in the region of fractures.

A protocol to develop crack-free biomimetic coatings on Ti6Al4V substrates

2007 ◽  
Vol 22 (6) ◽  
pp. 1593-1600 ◽  
Author(s):  
Sahil Jalota ◽  
Sutapa Bhaduri ◽  
Sarit B. Bhaduri ◽  
A. Cuneyt Tas
Keyword(s):  
Water Treatment ◽  
Calcium Phosphate ◽  
Alkali Treatment ◽  
Sodium Titanate ◽  
Calcium Phosphate Coating ◽  
First Case ◽  
Phosphate Coatings ◽  
Biomimetic Coating ◽  
One Step ◽  
Calcium Phosphate Coatings

Biomimetic coating of titanium and related alloys with carbonated apatitic calcium phosphate is an important area of research in implantology. While this paper specifically refers to coating Ti6Al4V, the results are valid with other related alloys as well. One step in the protocol involves an intermediate alkali treatment of Ti6Al4V to form a sodium titanate layer on the alloy surface. This pretreatment enhances the formation of the coating from simulated body fluid (SBF) solutions. Many papers in the biomimetic coating literature demonstrate the presence of cracks in coatings, irrespective of the SBF compositions and placement of the substrates. The presence of cracks may result in degradation and delamination of coatings. To the best of our knowledge, this issue remains unresolved. Therefore, the aim of this study was: (i) to examine and understand the reasons for cracking and (ii) based on the results, to develop a protocol for producing crack-free apatitic calcium phosphate coatings on Ti6Al4V substrates. In this study, the authors focused their attention on the alkali treatment procedure and the final drying step. It is hypothesized that these two steps of the process affect the crack formation the most. In the first case, the surfaces of alkali-treated substrates were examined with/without water-soaking treatment before immersing in SBF. This water treatment modifies the sodium titanate surface layer. In the second case, two different drying techniques (after soaking in SBF) were used. In one procedure, the coated substrates were dried rapidly, and in the other they were dried slowly. It was observed that the water treatment, irrespective of the drying method, provides a surface, which on subsequent soaking in SBF forms a crack-free apatitic calcium phosphate coating. Based on these results, the authors suggest a protocol incorporating a water-soaking treatment after the alkali treatment and prior to the SBF soaking treatment to obtain crack-free coatings.

scholarly journals A Review Paper on Biomimetic Calcium Phosphate Coatings

2015 ◽  
Vol 9 (1) ◽  
pp. 56-64 ◽  
Author(s):  
X. Lin ◽  
K. de Groot ◽  
D. Wang ◽  
Q. Hu ◽  
D. Wismeijer ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Drug Carrier ◽  
Chemical Properties ◽  
Giant Cells ◽  
Clinical Applications ◽  
Bone Morphogenetic Protein 2 ◽  
Crystalline Lattice ◽  
Calcium Phosphate Coating ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

Biomimetic calcium phosphate coatings have been developed for bone regeneration and repair because of their biocompatibility, osteoconductivity, and easy preparation. They can be rendered osteoinductive by incorporating an osteogenic agent, such as bone morphogenetic protein 2 (BMP-2), into the crystalline lattice work in physiological situations. The biomimetic calcium phosphate coating enables a controlled, slow and local release of BMP-2 when it undergoes cell mediated coating degradation induced by multinuclear cells, such as osteoclasts and foreign body giant cells, which mimics a physiologically similar release mode, to achieve sustained ectopic or orthotopic bone formation. Therefore, biomimetic calcium phosphate coatings are considered to be a promising delivery vehicle for osteogenic agents. In this review, we present an overview of biomimetic calcium phosphate coatings including their preparation techniques, physico-chemical properties, potential as drug carrier, and their pre-clinical application both in ectopic and orthotopic animal models. We briefly review some features of hydroxyapatite coatings and their clinical applications to gain insight into the clinical applications of biomimetic calcium phosphate coatings in the near future.

Composite Calcium Phosphate Coatings on Mg Alloy for Medicine

2015 ◽  
Vol 245 ◽  
pp. 159-165 ◽  
Author(s):  
Sergey V. Gnedenkov ◽  
Sergey L. Sinebryukhov ◽  
Artyom М. Puz' ◽  
Dmitry V. Mashtalyar ◽  
Natalya G. Plekhova
Keyword(s):  
Calcium Phosphate ◽  
Biologically Active ◽  
Mg Alloy ◽  
High Tech ◽  
Calcium Phosphate Coating ◽  
Phosphate Coatings ◽  
Calcium Phosphate Layer ◽  
Plasma Electrolytic ◽  
Calcium Phosphate Coatings

The high-tech method of creating anticorrosion calcium phosphate coating on the magnesium alloy MA8 (MgMnCe) has been developed. As was demonstrated by the volumetry method the sealing of the layer formed on the surface of Mg alloy using plasma electrolytic oxidation by superdispersed polytetrafluoroethylene substantially reduced the rate of the corrosion process. Here, the surface of the calcium phosphate layer containing hydroxyapatite (Ca/P = 1.61) remains biologically active. Studies of architectonics of the surface of innate immune cells have been performed in vitro.

Induction Heating Deposition of Calcium Phosphate Coating on Carbon/Carbon Composites for Biomedical Applications

2009 ◽  
Vol 79-82 ◽  
pp. 903-906 ◽  
Author(s):  
Xin Bo Xiong ◽  
Xie Rong Zeng ◽  
Chun Li Zhou
Keyword(s):  
Calcium Phosphate ◽  
Induction Heating ◽  
Ph Value ◽  
Scratch Test ◽  
Solution Concentration ◽  
Molar Ratio ◽  
Calcium Phosphate Coating ◽  
Carbon Composites ◽  
Phosphate Coatings ◽  
Calcium Phosphate Coatings

Calcium phosphate coatings were deposited on carbon/carbon composites by induction heating method at 353K. The phase, morphology and composition of the calcium phosphate coatings were characterized through X-ray diffraction (XRD), scanning electron microscopy (SEM) and the adhesion strength of these coatings and the scratched morphologies were determined by the scratch test and stereomicroscope (STM). The results show that when the solution concentration is less than 0.00125 M and pH value is large than 6, the phase of as-prepared coating is hydroxyapatite with Ca/P molar ratio of 1.67 or OCP with Ca/P molar ratio of 1.33, and when the solution concentration and pH value are in the range of 0.05-0.0125M and 5-6, the as-obtained coating are blends of brushite, monetite or OCP. These coatings have a porous morphology and are very easy to be scratched off. When the solution concentration is large than 0.05 M and pH value is less than 5, the as-prepared coatings are monetite with Ca/P molar ratio of 1. Among these monetite coatings, the coating on C/C prepared in 0.2M solution have highest bonding strength with a critical load of on average 13 N.

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