Microstructural and in-vitro characteristics of functional calcium silicate topcoat on hydroxyapatite coating for bio-implant applications

Singh, Jarnail; Chatha, Sukhpal Singh; Singh, Harmanpreet

doi:10.1007/s40204-022-00183-w

Cited by 9 publications

(5 citation statements)

References 54 publications

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“…The fretting wear properties of HVAF-sprayed HA coatings are tabulated in Table , where wear roughness, wear depth, and wear volume are found from 3D profile images, and the microstructural observation is shown in an optical image (Figure a) corresponding to 3D surface profilometry images (Figure b–d), and FESEM images (Figure e–l) were used to examine the wear rate and mechanisms. With hardness obtained at 334.33 ± 18.4 HV, one of the indentations shown in Figure S4, the obtained value is higher than that of the plasma-sprayed HA coating, i.e., 291.7 ± 45.7 HV measured in the same load and holding time …”

Section: Results and Discussionmentioning

confidence: 77%

“…With hardness obtained at 334.33 ± 18.4 HV, one of the indentations shown in Figure S4, the obtained value is higher than that of the plasma-sprayed HA coating, i.e., 291.7 ± 45.7 HV measured in the same load and holding time. 74 The fretting wear properties of HVAF-sprayed HA coatings showed superior results compared to other processes. Samiksha et al 75 conducted the fretting test on suspension plasma-sprayed HA coatings and observed a COF of 1.2 ± 0.08 at 1 N; they noted that the coatings were damaged during the experimentation, and the counterpart reached the substrate.…”

Section: ■ Results and Discussionmentioning

confidence: 94%

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An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

Jagadeeshanayaka,

Kele,

Jambagi

2023

Langmuir

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Section: Results and Discussionmentioning

confidence: 77%

Section: ■ Results and Discussionmentioning

confidence: 94%

An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

Jagadeeshanayaka,

Kele,

Jambagi

2023

Langmuir

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“…Hydroxyapatite is commonly used in various biomedical applications, including bone grafts, dental implants, and coatings for orthopedic implants. Its bioactive nature makes it a desirable material for promoting tissue regeneration and improving the long-term success and stability of implantable medical devices [ 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Biomimetic Nacre-Like Hydroxyapatite/Polymer Composites for Bone Implants

Tabrizian

Sun

Jargalsaikhan

et al. 2023

JFB

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One of the most ambitious goals for bone implants is to improve bioactivity, incapability, and mechanical properties; to reduce the need for further surgery; and increase efficiency. Hydroxyapatite (HA), the main inorganic component of bones and teeth, has high biocompatibility but is weak and brittle material. Cortical bone is composed of 70% calcium phosphate (CaP) and 30% collagen and forms a complex hierarchical structure with anisotropic and lamellar microstructure (osteons) which makes bone a light, strong, tough, and durable material that can support large loads. However, imitation of concentric lamellar structure of osteons is difficult to achieve in fabrication. Nacre from mollusk shells with layered structures has now become the archetype of the natural “model” for bio-inspired materials. Incorporating a nacre-like layered structure into bone implants can enhance their mechanical strength, toughness, and durability, reducing the risk of implant catastrophic failure or fracture. The layered structure of nacre-like HA/polymer composites possess high strength, toughness, and tunable stiffness which matches that of bone. The nacre-like HA/polymer composites should also possess excellent biocompatibility and bioactivity which facilitate the bonding of the implant with the surrounding bone, leading to improved implant stability and long-term success. To achieve this, a bi-directional freeze-casting technique was used to produce elongated lamellar HA were further densified and infiltrated with polymer to produce nacre-like HA/polymer composites with high strength and fracture toughness. Mechanical characterization shows that increasing the ceramic fractions in the composite increases the density of the mineral bridges, resulting in higher flexural and compressive strength. The nacre-like HA/(methyl methacrylate (MMA) + 5 wt.% acrylic acid (AA)) composites with a ceramic fraction of 80 vol.% showed a flexural strength of 158 ± 7.02 MPa and a Young’s modulus of 24 ± 4.34 GPa, compared with 130 ± 5.82 MPa and 19.75 ± 2.38 GPa, in the composite of HA/PMMA, due to the higher strength of the polymer and the interface of the composite. The fracture toughness in the composition of 5 wt.% PAA to PMMA improves from 3.023 ± 0.98 MPa·m1/2 to 5.27 ± 1.033 MPa·m1/2 by increasing the ceramic fraction from 70 vol.% to 80 vol.%, respectively.

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“…Nevertheless, the study is not devoid of limitations. A comprehensive analysis of the coatings' mechanical properties, aside from their antibacterial attributes, could provide a more holistic understanding of their potential applications [69][70][71]. Moreover, the study would benefit from a broader comparative framework that situates the findings in relation to existing methods and materials for HAP coatings.…”

mentioning

confidence: 99%

Calcium Hydroxyapatite Coatings: Low-Temperature Synthesis and Investigation of Antibacterial Properties

Lukaviciute,

Karciauskaite,

Grigoraviciute

et al. 2023

Coatings

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In the present work, the low-temperature synthesis of substituted calcium hydroxyapatite (Ca10(PO4)6(OH)2, HAP) with copper and zinc ions on titanium substrates was performed. Initially, CaCO3 coatings were synthesised on titanium substrate using the sol-gel method at 550 °C in a CO2 atmosphere. Crystalline calcium hydroxyapatite was then synthesised from these CaCO3 coatings through the dissolution-precipitation method at low temperature (80 °C). X-ray diffraction (XRD) analysis, FTIR and Raman spectroscopies, and scanning electron microscopy (SEM) were employed to evaluate the phase composition, surface functional groups, crystallinity, and morphology of the coatings. The results showed the formation of hexagonal HAP particles with a size of 20 nm at low temperature, exhibiting high homogeneity in particle size distribution. In the calcium hydroxyapatite, some of the Ca2+ ions were replaced by Cu2+ ions. Heating the mixture of Ca(NO3)2 and Cu(NO3)2 solutions at 550 °C in a CO2 atmosphere led to the formation of copper hydroxide carbonate (malachite, Cu2(OH)2CO3) along with CaCO3. The reaction between the sol-gel precursor obtained and Na2HPO4 resulted in the formation of copper-substituted hydroxyapatite (Cu-HAP). Different synthesis methods were tested with Zn2+ ions, and on the surface of the coating, Zn(OH)(NO3)(H2O), Zn3(OH)4(NO3)2, and unreacted CaCO3 were formed. Antibacterial properties of the coatings were tested using the inhibition zone method. No inhibition zones were observed for HAP. However, in the Cu and Zn containing coatings, inhibition zones were observed in the presence of a colony of B. subtilis bacteria. However, no inhibition zones were detected in the presence of E. coli bacteria.

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Microstructural and in-vitro characteristics of functional calcium silicate topcoat on hydroxyapatite coating for bio-implant applications

Cited by 9 publications

References 54 publications

An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

An Investigation into the Relative Efficacy of High-Velocity Air-Fuel-Sprayed Hydroxyapatite Implants Based on the Crystallinity Index, Residual Stress, Wear, and In-Flight Powder Particle Behavior

Biomimetic Nacre-Like Hydroxyapatite/Polymer Composites for Bone Implants

Calcium Hydroxyapatite Coatings: Low-Temperature Synthesis and Investigation of Antibacterial Properties

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