Improvement of bonding strength between biomimetic apatite coating and substrate

Qu, Haibo; Wei, Mei

doi:10.1002/jbm.b.30889

Cited by 41 publications

(26 citation statements)

References 61 publications

(129 reference statements)

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“…20,34 Our previous study indicated that the higher the bicarbonate ion concentration in the SBF, the denser the coating that was formed. 35 This study further supported our finding. Table III shows that the apatite coating formed at 408C with a low initial pH was more porous than the coating formed in a solution with a high or medium initial pH due to different bicarbonate contents in the SBF during apatite formation.…”

Section: Discussionsupporting

confidence: 94%

The effect of temperature and initial pH on biomimetic apatite coating

Wei

2008

J Biomed Mater Res

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Bone-like apatite coatings were prepared using a biomimetic method in a simulated body fluid (SBF). The effect of initial pH values and immersing temperatures on biomimetic apatite coating formation was studied. Three different temperatures were used in this study: 24 (room temperature), 40, and 60 degrees C. At each temperature, SBF solutions with three different initial pHs were chosen: low, medium, and high. The total inorganic carbon (TIC) content and pH-time profile of each coating system were recorded during the coating formation. The apatite coatings were characterized using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), and Fourier transform infra-red (FTIR). It has been found that SBF temperature has a great effect on the bicarbonate decomposition rate. The bicarbonate ions tend to decompose faster as the temperature increases. The decomposition of bicarbonate ions results in a pH increase in the SBF. With different initial SBF pHs, the decomposition of different amounts of bicarbonate ions is required to reach the critical pH range of apatite formation. With different amounts of bicarbonate ions in the SBF, the surface morphology of the biomimetic apatite coating formed is different. Therefore, the initial pH of the SBF solution plays a vital role in controlling the surface morphology of the biomimetic apatite coating. Also, it was found that as the SBF temperature increased, the critical pH range at which biomimetic apatite coating forms decreased. The critical pH range for the SBF prepared at 24, 40, and 60 degrees C was 6.65-6.71, 6.55-6.65, and 6.24-6.42, respectively.

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Section: Discussionsupporting

confidence: 94%

The effect of temperature and initial pH on biomimetic apatite coating

Wei

2008

J Biomed Mater Res

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“…Qu et al reported that they formed HA films on sandblasted, gritted and acid-etched titanium metal by aqueous solution method using SBF with modified ion composition [26]. They reported that bonding strength of the formed HA film was approximately 8–18 MPa.…”

Section: Resultsmentioning

confidence: 99%

Effect of Doubled Sandblasting Process and Basic Simulated Body Fluid Treatment on Fabrication of Bioactive Stainless Steels

et al. 2018

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In our recent study, we aimed to impart hydroxyapatite (HA)-forming to bioinert stainless steels (SUS316L). The surfaces of SUS316L specimen were treated by a sandblasting process using alumina grinding particles with 14.0 or 3.0 μm for average particle size, respectively. In addition, a doubled sandblasting process (DSP) using the 14.0 μm particles and subsequently 3.0 μm ones were also conducted. Compared with the case of the 14.0 μm particles, the 3.0 μm particles were available to increase the surface roughness and the surface area of the specimen. Moreover, these values were further increased in the case of the DSP. These specimens were soaked in simulated body fluid (SBF) at pH = 8.4, 25 °C and were directly heated in the solution by electromagnetic induction. By this treatment, formation of CaP was induced on each specimen. These materials performed high HA-forming ability in SBF. Average bonding strength of the HA film formed on them in SBF was increased depending on the increase of surface roughness and surface area. These results indicated that sandblasting condition was an important factor to improve interlocking effect related to the increase of the surface roughness and the surface area.

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“…46 Hence, the adhesion of apatite coatings is one of critical properties closely related to biocompatibility and longevity of metallic implants. 47 However, the modes of coating failure are quite complicated for pull-out tests, including adhesion failure, cohesive failure, and glue failure. By carefully controlling the volume of a modified SBF, Qu et al enhanced the tensile bonding strength of a biomimetic apatite coating up to 17.23 ± 2.55 MPa.…”

Section: Discussionmentioning

confidence: 99%

Characteristics and In Vitro Biologic Assay of Apatite/Titania Composite Coatings on Ti–6Al–4V for Medical Applications

Sun¹,

Zheng

Wang

2011

Int J Applied Ceramic Tech

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To improve the bioactivity, corrosion resistance, and long‐term biocompatibility of Ti–6Al–4V, apatite/titania composite coatings were synthesized on its surface using a H2O2‐oxidation and subsequent accelerated biomimetic deposition method. Scanning electron microscopic (SEM) examination of coating surfaces and cross‐sections showed that the composite coatings were dense and uniform. The phase composition of titania inner layer and apatite outer layer was investigated using transmission electron microscopy (TEM) and X‐ray diffraction (XRD). In addition, chemical composition of titania inner layer and apatite outer layer was determined using Fourier transform infrared spectroscopy (FTIR). Considering the results from TEM, XRD, and FTIR analyses, it could be concluded that titania inner layer consisted of poorly crystalline anatase phase, and apatite outer layer was composed of low crystalline, calcium‐deficient, and carbonated hydroxyapatite (HA). Based on variations of pH values of five‐time‐strength simulated body fluid (5SBF) during the accelerated biomimetic deposition, possible processes for the formation of the apatite outer layer were discussed. The chemical stability of the apatite/titania composite coatings was also investigated using potentiodynamic polarization tests. After 3 days in culture, viability of MCF‐7 cells seeded on uncoated and coated samples showed that the composite coatings were noncytotxic and could improve the biocompatibility of Ti–6Al–4V.

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Improvement of bonding strength between biomimetic apatite coating and substrate

Cited by 41 publications

References 61 publications

The effect of temperature and initial pH on biomimetic apatite coating

The effect of temperature and initial pH on biomimetic apatite coating

Effect of Doubled Sandblasting Process and Basic Simulated Body Fluid Treatment on Fabrication of Bioactive Stainless Steels

Characteristics and In Vitro Biologic Assay of Apatite/Titania Composite Coatings on Ti–6Al–4V for Medical Applications

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