301
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Crutchik D, Sánchez A, Garrido J. Simulation and experimental validation of multiple phosphate precipitates in a saline industrial wastewater. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2013.06.041] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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302
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Calcium phosphate ceramics in bone tissue engineering: a review of properties and their influence on cell behavior. Acta Biomater 2013; 9:8037-45. [PMID: 23791671 DOI: 10.1016/j.actbio.2013.06.014] [Citation(s) in RCA: 448] [Impact Index Per Article: 40.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 05/14/2013] [Accepted: 06/11/2013] [Indexed: 12/16/2022]
Abstract
Calcium phosphate ceramics (CPCs) have been widely used as biomaterials for the regeneration of bone tissue because of their ability to induce osteoblastic differentiation in progenitor cells. Despite the progress made towards fabricating CPCs possessing a range of surface features and chemistries, the influence of material properties in orchestrating cellular events such as adhesion and differentiation is still poorly understood. Specifically, questions such as why certain CPCs may be more osteoinductive than others, and how material properties contribute to osteoinductivity/osteoconductivity remain unanswered. Therefore, this review article systematically discusses the effects of the physical (e.g. surface roughness) and chemical properties (e.g. solubility) of CPCs on protein adsorption, cell adhesion and osteoblastic differentiation in vitro. The review also provides a summary of possible signaling pathways involved in osteoblastic differentiation in the presence of CPCs. In summary, these insights on the contribution of material properties towards osteoinductivity and the role of signaling molecules involved in osteoblastic differentiation can potentially aid the design of CPC-based biomaterials that support bone regeneration without the need for additional biochemical supplements.
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303
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Pajchel L, Kolodziejski W. Solid-state MAS NMR, TEM, and TGA studies of structural hydroxyl groups and water in nanocrystalline apatites prepared by dry milling. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2013; 15:1868. [PMID: 23990754 PMCID: PMC3751289 DOI: 10.1007/s11051-013-1868-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2012] [Accepted: 07/15/2013] [Indexed: 05/31/2023]
Abstract
A series of nanocrystalline calcium hydroxyapatites was prepared by dry milling and characterized using proton and 31P MAS NMR, TEM, and TGA methods. The samples contained stubby rod-shaped crystals, which length and width varied in the 130-30 and 95-20 nm ranges, respectively. It was confirmed that concentration of structural hydroxyl groups in nanocrystalline apatites decreases with the decreasing crystal size. In the series of the studied apatites, the decrease was from 86 to ca. 50 % in reference to stoichiometric apatite. Water was found in the surface hydrated layer and in the c-axis channels, in which compartments existed as adsorbed and structural, respectively. Molecules of the adsorbed water were capable of moving from the crystal surface into the lattice c-axis channels of apatite. This process introduced considerable structural disorder within and around those channels and reduced the content of the structural hydroxyl groups, particularly in the region underneath the apatite crystal surface.
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Affiliation(s)
- Lukasz Pajchel
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Medical University of Warsaw, ul. Banacha 1, 02-097 Warsaw, Poland
| | - Waclaw Kolodziejski
- Department of Inorganic and Analytical Chemistry, Faculty of Pharmacy, Medical University of Warsaw, ul. Banacha 1, 02-097 Warsaw, Poland
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304
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Fabrication of novel poly(lactic acid)/amorphous magnesium phosphate bionanocomposite fibers for tissue engineering applications via electrospinning. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:2302-10. [DOI: 10.1016/j.msec.2013.01.058] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 12/16/2012] [Accepted: 01/23/2013] [Indexed: 11/22/2022]
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305
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Suzuki O. Octacalcium phosphate (OCP)-based bone substitute materials. JAPANESE DENTAL SCIENCE REVIEW 2013. [DOI: 10.1016/j.jdsr.2013.01.001] [Citation(s) in RCA: 92] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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306
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Pighinelli L, Kucharska M. Chitosan–hydroxyapatite composites. Carbohydr Polym 2013; 93:256-62. [DOI: 10.1016/j.carbpol.2012.06.004] [Citation(s) in RCA: 136] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Revised: 05/23/2012] [Accepted: 06/05/2012] [Indexed: 11/27/2022]
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307
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Ruso JM, Verdinelli V, Hassan N, Pieroni O, Messina PV. Enhancing CaP biomimetic growth on TiO2 cuboids nanoparticles via highly reactive facets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:2350-2358. [PMID: 23360423 DOI: 10.1021/la305080x] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Pure decahedral anatase TiO(2) particles with high content of reactive {001} facets were obtained from titanium(IV) tetrachloride (TiCl(4)) using a microemulsions droplet system at specific conditions as chemical microreactor. The product was systematically characterized by X-ray diffraction, field-emission scanning and transmission electron microscopy (FE-SEM, TEM), N(2) adsorption-desorption isotherms, FT-IR and UV-vis spectroscopy, and photoluminescence studies. The obtained cuboids around 90 nm in size have a uniform and dense surface morphology with a BET specific surface area of 11.91 m(2) g(-1) and a band gap energy (3.18 eV) slightly inferior to the anatase dominated by the less-reactive {101} surface (3.20 eV). The presence of reactive facets on titania anatase favors the biomimetic growth of amorphous tricalcium phosphate after the first day of immersion in simulated human plasma. The results presented here can facilitate and improve the integration of anchored implants and enhance the biological responses to the soft tissues.
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Affiliation(s)
- Juan M Ruso
- Department of Applied Physics, University of Santiago de Compostela, Santiago de Compostela, Spain
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308
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Hwang ET, Tatavarty R, Chung J, Gu MB. New functional amorphous calcium phosphate nanocomposites by enzyme-assisted biomineralization. ACS APPLIED MATERIALS & INTERFACES 2013; 5:532-537. [PMID: 23273334 DOI: 10.1021/am302580p] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In the present study, we report on enzyme-assisted formation of biomineralized amorphous calcium phosphate nanocomposites (ACP-NCs). About 100-200 nm sizes of the spherical porous enzyme-assisted ACP-NCs were successfully synthesized via double reverse microemulsion, but no ACP-NCs formed without the enzyme. It is believed that the enzyme was used as an organic template or additive that could regulate the biomineralization process. The enzyme-assisted ACP-NCs were well characterized by X-ray diffraction, transmission electron microscopy, scanning electron microscopy, dynamic light scattering, and Brunauer-Emmett-Teller (BET) criteria. The BET surface area, total pore volume, pore size from adsorption, and pore size from desorption of the ACP-NCs were 163 m(2) g(-1) or 0.37 cm(3) g(-1), 8.87 nm, and 7.48 nm, respectively. The enzyme-assisted ACP-NCs retained about 43% of the catalytic activity of free carboxyl esterase. Furthermore, they preserved their bioactivity even after the 10th reuse and were stable over 10 days even under a stringent shaking conditions. The reported method paves the way for novel biomineralization via enzyme molecules to form functional enzymes containing nanocomposites.
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Affiliation(s)
- Ee Taek Hwang
- College of Life Sciences and Biotechnology, Korea University, Anam-dong, Seongbuk-Gu, Seoul, 136-701, South Korea
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309
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310
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Wang J, Chen Y, Li L, Sun J, Gu X, Xu X, Pan H, Tang R. Remineralization of dentin collagen by meta-stabilized amorphous calcium phosphate. CrystEngComm 2013. [DOI: 10.1039/c3ce40449h] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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311
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Tas AC. X-ray-amorphous calcium phosphate (ACP) synthesis in a simple biomineralization medium. J Mater Chem B 2013; 1:4511-4520. [DOI: 10.1039/c3tb20854k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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312
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Amorphous calcium phosphates synthesized by precipitation from calcium D-gluconate solutions. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2012.11.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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313
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Junginger M, Kübel C, Schacher FH, Müller AHE, Taubert A. Crystal structure and chemical composition of biomimetic calcium phosphate nanofibers. RSC Adv 2013. [DOI: 10.1039/c3ra23348k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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314
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Kim C, Kendall MR, Miller MA, Long CL, Larson PR, Humphrey MB, Madden AS, Tas AC. Comparison of titanium soaked in 5 M NaOH or 5 M KOH solutions. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013. [PMID: 23565038 DOI: 10.1016/j.msec.2012.08.047.] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Commercially pure titanium plates/coupons and pure titanium powders were soaked for 24 h in 5 M NaOH and 5 M KOH solutions, under identical conditions, over the temperature range of 37° to 90 °C. Wettability of the surfaces of alkali-treated cpTi coupons was studied by using contact angle goniometry. cpTi coupons soaked in 5 M NaOH or 5 M KOH solutions were found to have hydrophilic surfaces. Hydrous alkali titanate nanofibers and nanotubes were identified with SEM/EDXS and grazing incidence XRD. Surface areas of Ti powders increased > 50–220 times, depending on the treatment, when soaked in the above solutions. A solution was developed to coat amorphous calcium phosphate, instead of hydroxyapatite, on Ti coupon surfaces. In vitro cell culture tests were performed with osteoblast-like cells on the alkali-treated samples.
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Affiliation(s)
- Christina Kim
- Oklahoma School of Science and Mathematics, Oklahoma City, OK 73104, USA
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315
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Zhou H, Luchini TJF, Bhaduri SB. Microwave assisted synthesis of amorphous magnesium phosphate nanospheres. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2831-2837. [PMID: 22890518 DOI: 10.1007/s10856-012-4743-y] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Accepted: 08/02/2012] [Indexed: 06/01/2023]
Abstract
Magnesium phosphate (MgP) materials have been investigated in recent years for tissue engineering applications, attributed to their biocompatibility and biodegradability. This paper describes a novel microwave assisted approach to produce amorphous magnesium phosphate (AMP) in a nanospherical form from an aqueous solution containing Mg(2+) and HPO(4) (2-)/PO(4) (3-). Some synthesis parameters such as pH, Mg/P ratio, solution composition were studied and the mechanism of AMP precursors was also demonstrated. The as-produced AMP nanospheres were characterized and tested in vitro. The results proved these AMP nanospheres can self-assemble into mature MgP materials and support cell proliferation. It is expected such AMP has potential in biomedical applications.
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Affiliation(s)
- Huan Zhou
- Department of Mechanical, Industrial and Manufacturing Engineering, University of Toledo, Toledo, OH, USA.
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316
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Zhao J, Liu Y, Sun WB, Yang X. First detection, characterization, and application of amorphous calcium phosphate in dentistry. J Dent Sci 2012. [DOI: 10.1016/j.jds.2012.09.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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317
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Okada M, Furuzono T. Hydroxylapatite nanoparticles: fabrication methods and medical applications. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2012; 13:064103. [PMID: 27877527 PMCID: PMC5099760 DOI: 10.1088/1468-6996/13/6/064103] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2012] [Accepted: 11/19/2012] [Indexed: 05/30/2023]
Abstract
Hydroxylapatite (or hydroxyapatite, HAp) exhibits excellent biocompatibility with various kinds of cells and tissues, making it an ideal candidate for tissue engineering, orthopedic and dental applications. Nanosized materials offer improved performances compared with conventional materials due to their large surface-to-volume ratios. This review summarizes existing knowledge and recent progress in fabrication methods of nanosized (or nanostructured) HAp particles, as well as their recent applications in medical and dental fields. In section 1, we provide a brief overview of HAp and nanoparticles. In section 2, fabrication methods of HAp nanoparticles are described based on the particle formation mechanisms. Recent applications of HAp nanoparticles are summarized in section 3. The future perspectives in this active research area are given in section 4.
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Affiliation(s)
- Masahiro Okada
- Department of Biomaterials, Osaka Dental University, 8-1 Kuzuha-Hanazono, Hirakata, Osaka, 573-1121, Japan
| | - Tsutomu Furuzono
- Department of Biomedical Engineering, School of Biology-Oriented Science and Technology, Kinki University, 930 Nishi-Mitani, Kinokawa, Wakayama, 649-6493, Japan
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318
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Uskoković V, Desai TA. Phase composition control of calcium phosphate nanoparticles for tunable drug delivery kinetics and treatment of osteomyelitis. I. Preparation and drug release. J Biomed Mater Res A 2012; 101:1416-26. [PMID: 23115118 DOI: 10.1002/jbm.a.34426] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 08/20/2012] [Indexed: 01/27/2023]
Abstract
Developed in this study is a multifunctional material for simultaneous osseoinduction and drug delivery, potentially applicable in the treatment of osteomyelitis. It is composed of agglomerates of nanoparticles of calcium phosphate (CAP) with different monophasic contents. The drug-loading capacity and the release kinetics were investigated on two model drug compounds with different chemical structures, sizes, and adsorption propensities: bovine serum albumin and fluorescein. Loading of CAP powders with small molecule drugs was achieved by physisorption and desiccation-induced agglomeration of nanoparticulate subunits into microscopic blocks. The material dissolution rate and the drug release rate depended on the nature of the CAP phase, decreasing from monocalcium phosphate to monetite to amorphous CAP and calcium pyrophosphate to hydroxyapatite. The sustained release of the two model drugs was shown to be directly relatable to the degradation rate of CAP carriers. It was demonstrated that the degradation rate of the carrier and the drug release kinetics could be made tunable within the time scale of 1-2 h for the most soluble CAP phase, monocalcium phosphate, to 1-2 years for the least soluble one, hydroxyapatite. From the standpoint of antibiotic therapy for osteomyelitis, typically lasting for 6 weeks, the most prospective CAP powder was amorphous CAP with its release time scale for a small organic molecule, the same category to which antibiotics belong, of 1-2 months under the conditions applied in our experiments. By combining these different CAP phases in various proportions, drug release profiles could be tailored to the therapeutic occasion.
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Affiliation(s)
- Vuk Uskoković
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California 94158-2330, USA.
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319
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Shepherd JH, Shepherd DV, Best SM. Substituted hydroxyapatites for bone repair. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2012; 23:2335-2347. [PMID: 22389101 DOI: 10.1007/s10856-012-4598-2] [Citation(s) in RCA: 114] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 02/17/2012] [Indexed: 05/31/2023]
Abstract
Calcium phosphates such as hydroxyapatite have a wide range of applications both in bone grafts and for the coating of metallic implants, largely as a result of their chemical similarity to the mineral component of bone. However, to more accurately mirror the chemistry, various substitutions, both cationic (substituting for the calcium) and anionic (substituting for the phosphate or hydroxyl groups) have been produced. Significant research has been carried out in the field of substituted apatites and this paper aims to summarise some of the key effect of substitutions including magnesium, zinc, strontium, silicon and carbonate on physical and biological characteristics. Even small substitutions have been shown to have very significant effects on thermal stability, solubility, osteoclastic and osteoblastic response in vitro and degradation and bone regeneration in vivo.
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Affiliation(s)
- Jennifer H Shepherd
- Department of Materials Science and Metallurgy, University of Cambridge, New Museum's Site, Pembroke Street, Cambridge CB2 3QZ, UK.
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320
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Zhou H, Lawrence JG, Bhaduri SB. Fabrication aspects of PLA-CaP/PLGA-CaP composites for orthopedic applications: a review. Acta Biomater 2012; 8:1999-2016. [PMID: 22342596 DOI: 10.1016/j.actbio.2012.01.031] [Citation(s) in RCA: 147] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2011] [Revised: 12/14/2011] [Accepted: 01/25/2012] [Indexed: 01/20/2023]
Abstract
For several decades, composites made of polylactic acid-calcium phosphates (PLA-CaP) and polylactic acid-co-glycolic acid-calcium phosphates (PLGA-CaP) have seen widespread uses in orthopedic applications. This paper reviews the fabrication aspects of these composites, following the ubiquitous materials science approach by studying "processing-structure-property" correlations. Various fabrication processes such as microencapsulation, phase separation, electrospinning, supercritical gas foaming, etc., are reviewed, with specific examples of their applications in fabricating these composites. The effect of the incorporation of CaP materials on the mechanical and biological performance of PLA/PLGA is addressed. In addition, this paper describes the state of the art on challenges and innovations concerning CaP dispersion, incorporation of biomolecules/stem cells and long-term degradation of the composites.
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321
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Lee WH, Zavgorodniy AV, Loo CY, Rohanizadeh R. Synthesis and characterization of hydroxyapatite with different crystallinity: Effects on protein adsorption and release. J Biomed Mater Res A 2012; 100:1539-49. [DOI: 10.1002/jbm.a.34093] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2011] [Revised: 11/23/2011] [Accepted: 12/22/2011] [Indexed: 11/12/2022]
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322
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The effect of an octacalcium phosphate co-precipitated gelatin composite on the repair of critical-sized rat calvarial defects. Acta Biomater 2012; 8:1190-200. [PMID: 22198138 DOI: 10.1016/j.actbio.2011.12.002] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 12/03/2011] [Accepted: 12/05/2011] [Indexed: 11/23/2022]
Abstract
This study was designed to investigate the extent to which an octacalcium phosphate/gelatin (OCP/Gel) composite can repair rat calvarial critical-sized defects (CSD). OCP crystals were grown with various concentrations of gelatin molecules and the OCP/Gel composites were characterized by chemical analysis, X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), selected area electron diffraction (SAED) and mercury intrusion porosimetry. The OCP/Gel composite disks received vacuum dehydrothermal treatment, were implanted in Wistar rat calvarial CSD for 4, 8 and 16 weeks, and then subjected to radiologic, histologic, histomorphometric and histochemical assessment. The attachment of mouse bone marrow stromal ST-2 cells on the disks of the OCP/Gel composites was also examined after 1 day of incubation. OCP/Gel composites containing 24 wt.%, 31 wt.% and 40 wt.% of OCP and with approximate pore sizes of 10-500 μm were obtained. Plate-like crystals were observed closely associated with the Gel matrices. TEM, XRD, FTIR and SAED confirmed that the plate-like crystals were identical to those of the OCP phase, but contained a small amount of sphere-like amorphous material adjacent to the OCP crystals. The OCP (40 wt.%)/Gel composite repaired 71% of the CSD in conjunction with material degradation by osteoclastic cells, which reduced the percentage of the remaining implant to less than 3% within 16 weeks. Of the seeded ST-2 cells, 60-70% were able to migrate and attach to the OCP/Gel composites after 1 day of incubation, regardless of the OCP content. These results indicate that an OCP/Gel composite can repair rat calvarial CSD very efficiently and has favorable biodegradation characteristics. Therefore, it is hypothesized that host osteoblastic cells can easily migrate into an OCP/Gel composite.
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323
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Zhou H, Bhaduri S. Novel microwave synthesis of amorphous calcium phosphate nanospheres. J Biomed Mater Res B Appl Biomater 2012; 100:1142-50. [DOI: 10.1002/jbm.b.32681] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2011] [Revised: 12/27/2011] [Accepted: 01/02/2012] [Indexed: 11/09/2022]
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324
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Huang M, Wang Y. Synthesis of calcium phosphate microcapsules using yeast-based biotemplate. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c1jm13905c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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325
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Zhong C, Chu CC. Biomimetic mineralization of acid polysaccharide-based hydrogels: towards porous 3-dimensional bone-like biocomposites. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15610e] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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326
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Wang YW, Kim YY, Christenson HK, Meldrum FC. A new precipitation pathway for calcium sulfate dihydrate (gypsum) via amorphous and hemihydrate intermediates. Chem Commun (Camb) 2012; 48:504-6. [DOI: 10.1039/c1cc14210k] [Citation(s) in RCA: 118] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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327
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Sasaki JI, Matsumoto T, Egusa H, Matsusaki M, Nishiguchi A, Nakano T, Akashi M, Imazato S, Yatani H. In vitro reproduction of endochondral ossification using a 3D mesenchymal stem cell construct. Integr Biol (Camb) 2012; 4:1207-14. [DOI: 10.1039/c2ib20027a] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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328
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Saber-Samandari S, Gross KA. Amorphous calcium phosphate offers improved crack resistance: a design feature from nature? Acta Biomater 2011; 7:4235-41. [PMID: 21784179 DOI: 10.1016/j.actbio.2011.06.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 06/22/2011] [Accepted: 06/27/2011] [Indexed: 10/18/2022]
Abstract
Amorphous calcium phosphate (ACP) is found in biological organisms and coated implants, used in calcium phosphate cements, and has been recently confirmed as a precursor in mineralized tissue; however, nothing is known about crack initiation in ACP or its fracture toughness. The objective of this study was to determine the crack resistance of ACP to help understand its role in biological organisms and assist in the design of calcium-phosphate-based implants. ACP was manufactured by quenching droplets to form a bulk sample and individual splats. Testing of Berkovich and cube-corner indenter types revealed that the Berkovich indenter was more suitable, providing ease of crack detection. Nanoindentation was performed on polished ACP and hydroxyapatite (HAp), and cracks were identified with scanning electron microscopy. Additional nanoindentation was done on splats to assess the suitability for testing microarrays used in high throughput discovery of new bioceramics. ACP required about three times more force to initiate a crack compared to sintered HAp, but about nine times more than a single crystal. Crack initiation resistance decreased with increasing grain size. The fracture toughness of ACP was comparable to a single crystal, but higher for nanograined HAp. The crack initiation load can be potentially used for evaluating microsized samples. ACP prevents crack formation, but requires the presence of nanograins to provide a greater toughness. The implications of the higher crack initiation load in ACP are discussed for biological organisms and thermally processed biomaterials such as thermally sprayed and sintered HAp.
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329
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Dorozhkin SV. Calcium orthophosphates: occurrence, properties, biomineralization, pathological calcification and biomimetic applications. BIOMATTER 2011; 1:121-64. [PMID: 23507744 PMCID: PMC3549886 DOI: 10.4161/biom.18790] [Citation(s) in RCA: 150] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The present overview is intended to point the readers' attention to the important subject of calcium orthophosphates. This type of materials is of special significance for human beings, because they represent the inorganic part of major normal (bones, teeth and antlers) and pathological (i.e., those appearing due to various diseases) calcified tissues of mammals. For example, atherosclerosis results in blood vessel blockage caused by a solid composite of cholesterol with calcium orthophosphates, while dental caries and osteoporosis mean a partial decalcification of teeth and bones, respectively, that results in replacement of a less soluble and harder biological apatite by more soluble and softer calcium hydrogenphosphates. Therefore, the processes of both normal and pathological calcifications are just an in vivo crystallization of calcium orthophosphates. Similarly, dental caries and osteoporosis might be considered an in vivo dissolution of calcium orthophosphates. Thus, calcium orthophosphates hold a great significance for humankind, and in this paper, an overview on the current knowledge on this subject is provided.
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330
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Ning TY, Xu XH, Zhu LF, Zhu XP, Chu CH, Liu LK, Li QL. Biomimetic mineralization of dentin induced by agarose gel loaded with calcium phosphate. J Biomed Mater Res B Appl Biomater 2011; 100:138-44. [DOI: 10.1002/jbm.b.31931] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2011] [Revised: 07/12/2011] [Accepted: 07/20/2011] [Indexed: 11/10/2022]
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331
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Zhao J, Liu Y, Sun WB, Zhang H. Amorphous calcium phosphate and its application in dentistry. Chem Cent J 2011; 5:40. [PMID: 21740535 PMCID: PMC3143077 DOI: 10.1186/1752-153x-5-40] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Accepted: 07/08/2011] [Indexed: 11/10/2022] Open
Abstract
Amorphous Calcium Phosphate (ACP) is an essential mineral phase formed in mineralized tissues and the first commercial product as artificial hydroxyapatite. ACP is unique among all forms of calcium phosphates in that it lacks long-range, periodic atomic scale order of crystalline calcium phosphates. The X-ray diffraction pattern is broad and diffuse with a maximum at 25 degree 2 theta, and no other different features compared with well-crystallized hydroxyapatite. Under electron microscopy, its morphological form is shown as small spheroidal particles in the scale of tenths nanometer. In aqueous media, ACP is easily transformed into crystalline phases such as octacalcium phosphate and apatite due to the growing of microcrystalline. It has been demonstrated that ACP has better osteoconductivity and biodegradability than tricalcium phosphate and hydroxyapatite in vivo. Moreover, it can increase alkaline phosphatase activities of mesoblasts, enhance cell proliferation and promote cell adhesion. The unique role of ACP during the formation of mineralized tissues makes it a promising candidate material for tissue repair and regeneration. ACP may also be a potential remineralizing agent in dental applications. Recently developed ACP-filled bioactive composites are believed to be effective anti-demineralizing/remineralizing agents for the preservation and repair of tooth structures. This review provides an overview of the development, structure, chemical composition, morphological characterization, phase transformation and biomedical application of ACP in dentistry.
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Affiliation(s)
- Jie Zhao
- Stomatological Hospital, Nanjing University Medical School, 30 Zhongyang Road, Nanjing 210008, China.
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332
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Ma Z, Chen F, Zhu YJ, Cui T, Liu XY. Amorphous calcium phosphate/poly(d,l-lactic acid) composite nanofibers: Electrospinning preparation and biomineralization. J Colloid Interface Sci 2011; 359:371-9. [DOI: 10.1016/j.jcis.2011.04.023] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2011] [Revised: 03/30/2011] [Accepted: 04/08/2011] [Indexed: 11/25/2022]
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333
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Tsai TWT, Chen WY, Tseng YH, Chan JCC. Phase transformation of calcium phosphates in the presence of glutamic acid. CAN J CHEM 2011. [DOI: 10.1139/v11-032] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This work describes a phase-transformation pathway of calcium phosphate in the presence of glutamic acid. The route follows the order starting from amorphous calcium phosphate and brushite, then octacalcium phosphate (OCP), and finally hydroxyapatite (HAp). The preferred growth direction of the intermediate OCP and the final HAp phases lies along the c axis. On the basis of our scanning electron microscopy, X-ray powder diffraction, and 31P solid-state NMR data, we suggest that the transformation is via the dissolution–reprecipitation process, which is facilitated in the presence of glutamic acid. The effect on the transformation kinetics is rationalized by the disruption of the water layer bound on the crystal surface.
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Affiliation(s)
- Tim W. T. Tsai
- Chemistry Department, National Taiwan University, Roosevelt Road, Taipei, Taiwan
| | - Wei-Ya Chen
- Chemistry Department, National Taiwan University, Roosevelt Road, Taipei, Taiwan
| | - Yao-Hung Tseng
- Chemistry Department, National Taiwan University, Roosevelt Road, Taipei, Taiwan
| | - Jerry C. C. Chan
- Chemistry Department, National Taiwan University, Roosevelt Road, Taipei, Taiwan
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334
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Lopez-Heredia MA, Bohner M, Zhou W, Winnubst AJA, Wolke JGC, Jansen JA. The effect of ball milling grinding pathways on the bulk and reactivity properties of calcium phosphate cements. J Biomed Mater Res B Appl Biomater 2011; 98:68-79. [DOI: 10.1002/jbm.b.31833] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2011] [Accepted: 02/01/2011] [Indexed: 11/08/2022]
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335
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Lewis G. Viscoelastic properties of injectable bone cements for orthopaedic applications: State-of-the-art review. J Biomed Mater Res B Appl Biomater 2011; 98:171-91. [DOI: 10.1002/jbm.b.31835] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2010] [Revised: 12/08/2010] [Accepted: 02/10/2011] [Indexed: 02/05/2023]
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336
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Mohn D, Doebelin N, Tadier S, Bernabei RE, Luechinger NA, Stark WJ, Bohner M. Reactivity of calcium phosphate nanoparticles prepared by flame spray synthesis as precursors for calcium phosphate cements. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm11977j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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337
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Slater C, Laurencin D, Burnell V, Smith ME, Grover LM, Hriljac JA, Wright AJ. Enhanced stability and local structure in biologically relevant amorphous materials containing pyrophosphate. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm13930d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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338
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How to control the size and morphology of apatite nanocrystals in bone. Proc Natl Acad Sci U S A 2010; 107:22369-70. [PMID: 21169505 DOI: 10.1073/pnas.1017493108] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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339
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Uskoković V, Uskoković DP. Nanosized hydroxyapatite and other calcium phosphates: Chemistry of formation and application as drug and gene delivery agents. J Biomed Mater Res B Appl Biomater 2010; 96:152-91. [DOI: 10.1002/jbm.b.31746] [Citation(s) in RCA: 389] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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340
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Liu Y, Kim YK, Dai L, Li N, Khan SO, Pashley DH, Tay FR. Hierarchical and non-hierarchical mineralisation of collagen. Biomaterials 2010; 32:1291-300. [PMID: 21040969 DOI: 10.1016/j.biomaterials.2010.10.018] [Citation(s) in RCA: 124] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2010] [Accepted: 10/10/2010] [Indexed: 10/18/2022]
Abstract
Biomineralisation of collagen involves functional motifs incorporated in extracellular matrix protein molecules to accomplish the objectives of stabilising amorphous calcium phosphate into nanoprecursors and directing the nucleation and growth of apatite within collagen fibrils. Here we report the use of small inorganic polyphosphate molecules to template hierarchical intrafibrillar apatite assembly in reconstituted collagen in the presence of polyacrylic acid to sequester calcium and phosphate into transient amorphous nanophases. The use of polyphosphate without a sequestration analogue resulted only in randomly-oriented extrafibrillar precipitations along the fibrillar surface. Conversely, the use of polyacrylic acid without a templating analogue resulted only in non-hierarchical intrafibrillar mineralisation with continuous apatite strands instead of discrete crystallites. The ability of using simple non-protein molecules to recapitulate different levels of structural hierarchy in mineralised collagen signifies the ultimate simplicity in Nature's biomineralisation design principles and challenges the need for using more complex recombinant matrix proteins in bioengineering applications.
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Affiliation(s)
- Yan Liu
- Department of Stomatology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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341
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Dorozhkin SV. Amorphous Calcium Phosphates. JOURNAL OF BIOMIMETICS, BIOMATERIALS AND TISSUE ENGINEERING 2010; 7:27-53. [DOI: 10.4028/www.scientific.net/jbbte.7.27] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/02/2024]
Abstract
Amorphous calcium phosphates (ACPs) represent a unique class of biomedically relevant calcium orthophosphate salts, in which there are neither translational nor orientational long-range orders of the atomic positions. Nevertheless, the constancy in their chemical composition over a relatively wide range of preparation conditions suggests the presence of a well-defined local structural unit, presumably, with the structure of Ca9(PO4)6 – so-called Posner’s cluster. ACPs have variable chemical but rather identical glass-like physicochemical properties. Furthermore, all ACPs are thermodynamically unstable compounds and, unless stored in dry conditions or doped by stabilizers, spontaneously they tend to transform to crystalline calcium orthophosphates. Although some order within general disorder is the most distinguishing feature of ACPs, the solution instability of ACPs and their easy transformation to crystalline phases might be of a great biological relevance. Namely, the initiating role ACPs play in matrix vesicle biomineralization raises the importance of this phase from a mere laboratory curiosity to that of a key intermediate in skeletal calcification. Furthermore, ACPs are very promising candidates to manufacture artificial bone grafts.
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