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Bone Cements Based on Struvite: The Effect of Vancomycin Loading and Assessment of Biocompatibility and Osteoconductive Potentials In Vivo. RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s0036023621080118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Effect of Complex Additives Based on Iron, Cobalt, and Manganese Oxides and Sodium Silicate on the Sintering and Properties of Low-Temperature Ceramics 3Y–TZP–Al2O3. RUSS J INORG CHEM+ 2021. [DOI: 10.1134/s0036023621080192] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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X-Ray Diffraction and Multifrequency EPR Study of Radiation-Induced Room Temperature Stable Radicals in Octacalcium Phosphate. Radiat Res 2021; 195:200-210. [PMID: 33302290 DOI: 10.1667/rade-20-00194.1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 10/12/2020] [Indexed: 11/03/2022]
Abstract
Octacalcium phosphate (OCP) {Ca8H2(PO4)6×5H2O] has attracted increasing attention over the last decade as a transient intermediate to the biogenic apatite for bone engineering and in studies involving the processes of pathological calcification. In this work, OCP powders obtained by hydrolysis of dicalcium phosphate dehydrate were subjected to X- and γ-ray irradiation and studied by means of stationary and pulsed electron paramagnetic resonance at 9, 36 and 94 GHz microwave frequencies. Several types of paramagnetic centers were observed in the investigated samples. Their spectroscopic parameters (components of the g and hyperfine tensors) were determined. Based on the extracted parameters, the induced centers were ascribed to H0, CO33-, CO2- and nitrogen-centered (presumably NO32-) radicals. The spectroscopic parameters of the nitrogen-centered stable radical in OCP powders were found to be markedly different from those in hydroxyapatite. According to X-ray diffraction data, γ-ray irradiation allowed the phase composition of calcium phosphates to change; all minor phases with the exception of OCP and hydroxyapatite disappeared, while the OCP crystal lattice parameters changed after irradiation. The obtained results could be used for the tracing of mineralization processes from their initiation to completion of the final product, identification of the OCP phase, and to follow the influence of radiation processes on phase composition of calcium phosphates.
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Effect of Co2+ on the Phase Formation, Mechanical Properties, and In Vitro Behavior of Ceramics in the ZrO2–Al2O3 System. DOKLADY CHEMISTRY 2020. [DOI: 10.1134/s0012500820070010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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6
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The Effect of Phosphate Groups on the Structure and Properties of Bone Cements Based on Calcium Sulfate. DOKLADY CHEMISTRY 2020. [DOI: 10.1134/s0012500820080017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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7
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High-Temperature Solid-Phase Interaction of Hydroxyapatite with Mg, Sr, and Zn Nitrates. DOKLADY CHEMISTRY 2018. [DOI: 10.1134/s0012500818110095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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8
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Abstract
Modern achievements of technical progress, in particular additive technologies (ATs) and three-dimensional printing, have been increasingly introduced in neurosurgical practice. The increasing complexity of surgical interventions requires thorough planning of surgery and a high level of training of young neurosurgeons. Creation of full-scale three-dimensional models for planning of surgery enables visualization of the anatomical region of interest. Additive technologies are especially extensively used in reconstructive surgery of skull defects. ATs enable fast and efficient solving of the following tasks: - generation of accurate models of the skull and an implant; - development and fabrication of individual molds for intraoperative formation of implants from polymeric two-component materials (e.g., PMMA); - fabrication of individual implants from titanium alloys or polyetheretherketone (PEEK) for further use in surgery.
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Multimodal-3D imaging based on μMRI and μCT techniques bridges the gap with histology in visualization of the bone regeneration process. J Tissue Eng Regen Med 2017; 12:750-761. [PMID: 28593731 DOI: 10.1002/term.2494] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 04/23/2017] [Accepted: 06/05/2017] [Indexed: 01/05/2023]
Abstract
Bone repair/regeneration is usually investigated through X-ray computed microtomography (μCT) supported by histology of extracted samples, to analyse biomaterial structure and new bone formation processes. Magnetic resonance imaging (μMRI) shows a richer tissue contrast than μCT, despite at lower resolution, and could be combined with μCT in the perspective of conducting non-destructive 3D investigations of bone. A pipeline designed to combine μMRI and μCT images of bone samples is here described and applied on samples of extracted human jawbone core following bone graft. We optimized the coregistration procedure between μCT and μMRI images to avoid bias due to the different resolutions and contrasts. Furthermore, we used an Adaptive Multivariate Clustering, grouping homologous voxels in the coregistered images, to visualize different tissue types within a fused 3D metastructure. The tissue grouping matched the 2D histology applied only on 1 slice, thus extending the histology labelling in 3D. Specifically, in all samples, we could separate and map 2 types of regenerated bone, calcified tissue, soft tissues, and/or fat and marrow space. Remarkably, μMRI and μCT alone were not able to separate the 2 types of regenerated bone. Finally, we computed volumes of each tissue in the 3D metastructures, which might be exploited by quantitative simulation. The 3D metastructure obtained through our pipeline represents a first step to bridge the gap between the quality of information obtained from 2D optical microscopy and the 3D mapping of the bone tissue heterogeneity and could allow researchers and clinicians to non-destructively characterize and follow-up bone regeneration.
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In situ formation of porous mineral–polymer scaffold for tissue engineering. DOKLADY CHEMISTRY 2017. [DOI: 10.1134/s001250081705007x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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11
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Formation of composite scaffolds based on chitosan and calcium phosphate. DOKLADY CHEMISTRY 2016. [DOI: 10.1134/s0012500816070016] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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12
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Bone cements in the calcium phosphate–chitosan systems containing magnesium and zinc. DOKLADY CHEMISTRY 2016. [DOI: 10.1134/s001250081606001x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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[The impact of octacalcium phosphate on the dynamics of bone matrix formation in experimental bone defects]. STOMATOLOGII︠A︡ 2016; 95:6-9. [PMID: 27367191 DOI: 10.17116/stomat20169536-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The aim of the study was to assess the interaction of of octacalcium phosphate (OCP) with bone matrix and cells and its impact on the process of bone generation. The survey was conducted on animal model: critical hipbone defect was created in 12 230-250 g Wister rats. The animals were then divided in two groups. In group 1 (6 animals) defect was left to heal under blood clot and in group 2 (6 animals) it was filled with OCP. Three animals with no defect served as a control group. It was showed significant (p<0.05) increase of the area of the newly formed bone tissue and its direct correlation with duration of observation.
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Silver-Doped Calcium Phosphate Bone Cements with Antibacterial Properties. J Funct Biomater 2016; 7:jfb7020010. [PMID: 27096874 PMCID: PMC4932467 DOI: 10.3390/jfb7020010] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 04/12/2016] [Accepted: 04/12/2016] [Indexed: 11/19/2022] Open
Abstract
Calcium phosphate bone cements (CPCs) with antibacterial properties are demanded for clinical applications. In this study, we demonstrated the use of a relatively simple processing route based on preparation of silver-doped CPCs (CPCs-Ag) through the preparation of solid dispersed active powder phase. Real-time monitoring of structural transformations and kinetics of several CPCs-Ag formulations (Ag = 0 wt %, 0.6 wt % and 1.0 wt %) was performed by the Energy Dispersive X-ray Diffraction technique. The partial conversion of β-tricalcium phosphate (TCP) phase into the dicalcium phosphate dihydrate (DCPD) took place in all the investigated cement systems. In the pristine cement powders, Ag in its metallic form was found, whereas for CPC-Ag 0.6 wt % and CPC-Ag 1.0 wt % cements, CaAg(PO3)3 was detected and Ag (met.) was no longer present. The CPC-Ag 0 wt % cement exhibited a compressive strength of 6.5 ± 1.0 MPa, whereas for the doped cements (CPC-Ag 0.6 wt % and CPC-Ag 1.0 wt %) the reduced values of the compressive strength 4.0 ± 1.0 and 1.5 ± 1.0 MPa, respectively, were detected. Silver-ion release from CPC-Ag 0.6 wt % and CPC-Ag 1.0 wt % cements, measured by the Atomic Emission Spectroscopy, corresponds to the average values of 25 µg/L and 43 µg/L, respectively, rising a plateau after 15 days. The results of the antibacterial test proved the inhibitory effect towards pathogenic Escherichia coli for both CPC-Ag 0.6 wt % and CPC-Ag 1.0 wt % cements, better performances being observed for the cement with a higher Ag-content.
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15
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Kinetics of the release of antibiotics from chitosan-based biodegradable biopolymer membranes. DOKLADY CHEMISTRY 2015. [DOI: 10.1134/s001250081511004x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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The shear strength of three-dimensional capillary-porous titanium coatings for intraosseous implants. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 60:255-259. [PMID: 26706529 DOI: 10.1016/j.msec.2015.11.033] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 09/29/2015] [Accepted: 11/11/2015] [Indexed: 01/28/2023]
Abstract
A plasma spraying process for the deposition of three-dimensional capillary-porous titanium coatings using a wire has been developed. In this process, two additional dc arcs are discharged between plasmatron and both the wire and the substrate, resulting in additional activation of the substrate and the particles, particularly by increasing their temperature. The shear strength of the titanium coating with 46% porosity is 120.6 MPa. A new procedure for estimating the shear strength of porous coatings has been developed.
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Some Physical, Chemical, and Biological Parameters of Samples of Scleractinium Coral Aquaculture Skeleton Used for Reconstruction/Engineering of the Bone Tissue. Bull Exp Biol Med 2015; 159:494-7. [PMID: 26388568 DOI: 10.1007/s10517-015-3001-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Indexed: 10/23/2022]
Abstract
Physical and chemical (phase and chemical composition, dynamics of resorption, and strength properties), and biological (cytological compatibility and scaffold properties of the surface) properties of samples of scleractinium coral skeletons from aquacultures of three types and corresponding samples of natural coral skeletons (Pocillopora verrucosa, Acropora formosa, and Acropora nobilis) were studied. Samples of scleractinium coral aquaculture skeleton of A. nobilis, A. formosa, and P. verrucosa met the requirements (all study parameters) to materials for osteoplasty and 3D-scaffolds for engineering of bone tissue.
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18
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Modification of bone cements in the calcium phosphate-chitosan systems by ceramic and alginate beads. DOKLADY CHEMISTRY 2015. [DOI: 10.1134/s0012500815040023] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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19
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Mineralization of the chitosan-octacalcium phosphate composite material in a simulated human body fluid. DOKLADY CHEMISTRY 2015. [DOI: 10.1134/s0012500814120027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Stabilization of Carbonate Hydroxyapatite by Isomorphic Substitutions of Sodium for Calcium. RUSS J INORG CHEM+ 2014. [DOI: 10.1134/s0036023608020022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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21
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Destruction of the chitosan matrix for tissue engineering during γ-irradiation sterilization. DOKLADY CHEMISTRY 2014. [DOI: 10.1134/s0012500814020013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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[Comparative study of osteoplastic materials based on chitosan, alginate or fibrin with tricalcium phosphate]. STOMATOLOGIIA 2014; 93:4-10. [PMID: 24576958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The study presents comparative analysis of porous composites made of chitosan, alginate, fibrin with beta-tricalcium phosphate. Histological findings on Wistar rat condyles showed that fibrin-beta-TCP-based composite had the most effective positive biological response.
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23
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Synthesis of calcium phosphates on chitosan macromolecules in the presence of amino acids. DOKLADY CHEMISTRY 2013. [DOI: 10.1134/s0012500813080041] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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24
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25
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Hydrolysis of dicalcium phosphate dihydrate in a sodium acetate solution. DOKLADY CHEMISTRY 2013. [DOI: 10.1134/s0012500812120063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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26
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Zinc- and silver-substituted hydroxyapatite: Synthesis and properties. DOKLADY CHEMISTRY 2012. [DOI: 10.1134/s0012500812020097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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28
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[A comparative study of bone regeneration potency of alfa and beta-tricalcium phosphate bone substitute materials]. STOMATOLOGIIA 2012; 91:16-21. [PMID: 23268211] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Review of the literature and our own investigations describe structure, synthesis and participation in biomineralisation of bone of synthetic bone scaffold tricalcium phosphate with original surface.
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29
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High-porous calcium phosphate bioceramics reinforced by chitosan infiltration. DOKLADY CHEMISTRY 2011. [DOI: 10.1134/s0012500811080027] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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30
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High-porous composites in the biopolymer-calcite system for the use in tissue engineering. DOKLADY CHEMISTRY 2011. [DOI: 10.1134/s0012500811030013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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31
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Magnesium distribution in the synthesis of biphasic calcium phosphates. DOKLADY CHEMISTRY 2011. [DOI: 10.1134/s0012500808020067] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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33
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[Calcium phosphate bone cements. Application in oral and maxillofacial surgery]. STOMATOLOGIIA 2011; 90:64-72. [PMID: 22332385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Biodegradation of porous calcium phosphate scaffolds in an ectopic bone formation model studied by X-ray computed microtomograph. Eur Cell Mater 2010; 19:136-46. [PMID: 20349404 DOI: 10.22203/ecm.v019a14] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
Three types of ceramic scaffolds with different composition and structure [namely synthetic 100% hydroxyapatite (HA; Engipore), synthetic calcium phosphate multiphase biomaterial containing 67% silicon stabilized tricalcium phosphate (Si-TCP; Skelite) and natural bone mineral derived scaffolds (Bio-oss)] were seeded with mesenchymal stem cells (MSC) and ectopically implanted for 8 and 16 weeks in immunodeficient mice. X-ray synchrotron radiation microtomography was used to derive 3D structural information on the same scaffolds both before and after implantation. Meaningful images and morphometric parameters such as scaffold and bone volume fraction, mean thickness and thickness distribution of the different phases as a function of the implantation time, were obtained. The used imaging algorithms allowed a direct comparison and registration of the 3D structure before and after implantation of the same sub-volume of a given scaffold. In this way it was possible to directly monitor the tissue engineered bone growth and the complete or partial degradation of the scaffold. Further, the detailed kinetics studies on Skelite scaffolds implanted for different length of times from 3 days to 24 weeks, revealed in the X-ray absorption histograms two separate peaks associated to HA and TCP. It was therefore possible to observe that the progressive degradation of the Skelite scaffolds was mainly due to the resorption of TCP. The different saturation times in the tissue engineered bone growth and in the TCP resorption confirmed that the bone growth was not limited the scaffold regions that were resorbed but continued in the inward direction with respect to the pore surface.
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36
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[Octacalcium phosphate--precursor of biomineralization, novel bone scaffold]. STOMATOLOGIIA 2010; 89:57-64. [PMID: 21186653] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Review of the literature and our own investigations describes structure, synthesis, hydrolysis, participation in biomineralisation of bone and teeth of octacalcium phosphate, a new synthetic bone scaffold.
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37
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Bioactive composite ceramics in the hydroxyapatite-tricalcium phosphate system. DOKLADY CHEMISTRY 2007. [DOI: 10.1134/s0012500807030044] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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38
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Structural changes in carbonated hydroxyapatite at high temperatures as probed by 1H NMR and Raman spectroscopy. DOKLADY CHEMISTRY 2007. [DOI: 10.1134/s0012500807030020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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39
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Kinetics of in vivo bone deposition by bone marrow stromal cells within a resorbable porous calcium phosphate scaffold: An X-ray computed microtomography study. Biotechnol Bioeng 2007; 98:271-81. [PMID: 17657771 DOI: 10.1002/bit.21418] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Resorbable ceramic scaffolds based on Silicon stabilized tricalcium phosphate (Si-TCP) were seeded with bone marrow stromal cells (BMSC) and ectopically implanted for 2, 4, and 6 months in immunodeficient mice. Qualitative and quantitative evaluation of the scaffold material was performed by X-ray synchrotron radiation computed microtomography (microCT) with a spatial resolution lower than 5 microm. Unique to these experiments was that microCT data were first collected on the scaffolds before implantation and then on the same scaffolds after they were seeded with BMSC, implanted in the mice and rescued after different times. Volume fraction, mean thickness and thickness distribution were evaluated for both new bone and scaffold phases as a function of the implantation time. New bone thickness increased from week 8 to week 16. Data for the implanted scaffolds were compared with those derived from the analysis of the same scaffolds prior to implantation and with data derived from 100% hydroxyapatite (HA) scaffold treated and analyzed in the same way. At variance with findings with the 100% HA scaffolds a significant variation in the density of the different Si-TCP scaffold regions in the pre- and post-implantation samples was observed. In particular a post-implantation decrease in the density of the scaffolds, together with major changes in the scaffold phase composition, was noticeable in areas adjacent to newly formed bone. Histology confirmed a better integration between new bone and scaffold in the Si-TCP composites in comparison to 100% HA composites where new bone and scaffold phases remained well distinct.
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Kinetics ofIn VivoBone Deposition by Bone Marrow Stromal Cells into Porous Calcium Phosphate Scaffolds: An X-Ray Computed Microtomography Study. ACTA ACUST UNITED AC 2006; 12:3449-58. [PMID: 17518681 DOI: 10.1089/ten.2006.12.3449] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
In a typical bone tissue engineering application, osteogenic cells are harvested and seeded on a three-dimensional (3D) synthetic scaffold that acts as guide and stimulus for tissue growth, creating a tissue engineering construct or living biocomposite. Despite the large number of performed experiments in different laboratories, information on the kinetics of bone growth into the scaffolds is still scarce. Highly porous hydroxyapatite scaffolds were investigated before the implantation and after they were seeded with in vitro expanded bone marrow stromal cells (BMSC) and implanted for 8, 16, or 24 weeks in immunodeficient mice. Synchrotron x-ray computed microtomography (microCT) was used for qualitative and quantitative 3D characterization of the scaffold material and 3D evaluation of tissue engineered bone growth kinetics after in vivo implantation. Experiments were performed taking advantage of a dedicated set up at the European Synchrotron Radiation Facility (ESRF, Grenoble, France), which allowed quantitative imaging at a spatial resolution of about 5 microm. A peculiarity of these experiments was the fact that at first the data were obtained on the different pure scaffolds, then the same scaffolds were seeded by BMSC, implanted, and brought again to ESRF for investigating the formation of new bone. The volume fraction, average thickness, and distribution of the newly formed bone were evaluated as a function of the implantation time. New bone thickness increased from week 8 to week 16, but deposition of new bone was arrested from week 16 to week 24. Instead, mineralization of the newly deposited bone matrix continued up to week 24.
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41
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Nanosized hydroxyapatite synthesized by precipitation in a gelatin solution. DOKLADY CHEMISTRY 2006. [DOI: 10.1134/s0012500806110073] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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42
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Bioceramic granules with controlled resorbability for bone tissue therapy. DOKLADY CHEMISTRY 2006. [DOI: 10.1134/s0012500806070068] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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43
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[Application of cell technologies to tissue defect closure in oncology]. VESTNIK ROSSIISKOI AKADEMII MEDITSINSKIKH NAUK 2006:34-8. [PMID: 16869259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
In vivo and in vitro experiments on the application of cell technologies to tissue defect closure were conducted; autologic mesenchymal stem cells on 3-demensional matrices were used. The authors analyze the results of the application of bioengineering tissue equivalents for the closure of soft tissue and upper airway defects after extensive resections performed in 52 oncological patients. Tissue equivalents with stem cells provide engraftment and long-term graft functioning; they also modify wound surface, thus stimulating wound epithelization. In this study the application of tissue equivalents led to wound healing and functional recovery in 87% of patients.
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Porous apatite biocompatible scaffolds for cell technology for the repair of tissue defects in surgery. DOKLADY CHEMISTRY 2005. [DOI: 10.1007/s10631-005-0031-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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45
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Synchrotron Radiation Microtomography of Bone Engineered from Bone Marrow Stromal Cells. ACTA ACUST UNITED AC 2004; 10:1767-74. [PMID: 15684685 DOI: 10.1089/ten.2004.10.1767] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Osteoprogenitor cells expanded in vitro and associated with porous ceramic scaffolds have been proposed as bone substitutes. Animal models have been developed to test the efficacy of various cell populations and scaffolds in promoting bone repair. Qualitative analysis of the new bone formed within the ceramic scaffold is relatively easy by conventional histology. On the other hand, quantitative data are difficult to obtain. X-ray computed microtomography was used as a possible experimental technique to obtain quantitative data on the three-dimensional structure of newly formed bone and of remaining scaffold in implants after 8 weeks in vivo. Measurements were performed at the European Synchrotron Radiation Facility on beamline ID19 with a spatial resolution of about 5 microm. This study clearly indicates the possibility of nondestructive quantitative analysis of bone-engineered constructs. The technique appears suitable to compare different scaffolds (and possibly different cell populations) with regard to bone formation efficiency and reabsorbability of biomaterials in the immunodeficient mouse model.
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Porous hydroxyapatite ceramics of bi-modal pore size distribution. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2002; 13:295-299. [PMID: 15348627 DOI: 10.1023/a:1014015002331] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
A route for the fabrication of porous hydroxyapatite ceramics having two populations of open pores is reported. The bodies are prepared by sintering the spherical gelatin/hydroxyapatite granules. As the result, ceramics containing intragranular small-size pores and intergranular large-size interconnecting pores are obtained. The pore size and content are dependent on the route. Ceramics can generally be applied as bone replacement materials where the interconnections in the intergranular pores are the pathway to conduct cells and vessels for the bone ingrowth, whereas the intragranular pores can be filled with a drug, e.g. to eliminate infections.
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