1
|
Zhao X, Zhang Y, Wang P, Guan J, Zhang D. Construction of multileveled and oriented micro/nano channels in Mg doped hydroxyapitite bioceramics and their effect on mimicking mechanical property of cortical bone and biological performance of cancellous bone. BIOMATERIALS ADVANCES 2024; 161:213871. [PMID: 38692181 DOI: 10.1016/j.bioadv.2024.213871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/16/2023] [Revised: 04/13/2024] [Accepted: 04/24/2024] [Indexed: 05/03/2024]
Abstract
Drawing on the structure and components of natural bone, this study developed Mg-doped hydroxyapatite (Mg-HA) bioceramics, characterized by multileveled and oriented micro/nano channels. These channels play a critical role in ensuring both mechanical and biological properties, making bioceramics suitable for various bone defects, particularly those bearing loads. Bioceramics feature uniformly distributed nanogrooves along the microchannels. The compressive strength or fracture toughness of the Mg-HA bioceramics with micro/nano channels formed by single carbon nanotube/carbon fiber (CNT/CF) (Mg-HA(05-CNT/CF)) are comparable to those of cortical bone, attributed to a combination of strengthened compact walls and microchannels, along with a toughening mechanism involving crack pinning and deflection at nanogroove intersections. The introduction of uniform nanogrooves also enhanced the porosity by 35.4 %, while maintaining high permeability owing to the capillary action in the oriented channels. This leads to superior degradation properties, protein adsorption, and in vivo osteogenesis compared with bioceramics with only microchannels. Mg-HA(05-CNT/CF) exhibited not only high strength and toughness comparable to cortical bone, but also permeability similar to cancellous bone, enhanced cell activity, and excellent osteogenic properties. This study presents a novel approach to address the global challenge of applying HA-based bioceramics to load-bearing bone defects, potentially revolutionizing their application in tissue engineering.
Collapse
Affiliation(s)
- Xueni Zhao
- College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China.
| | - Yu Zhang
- College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Pengfei Wang
- College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Jinxin Guan
- College of Mechanical and Electrical Engineering, Shaanxi University of Science and Technology, Xi'an, Shaanxi 710021, PR China
| | - Dexin Zhang
- Department of Respiratory and Critical Care Medicine, Second Affiliated Hospital of Medical College, Xi'an Jiaotong University, Xi'an, Shaanxi 710004, PR China.
| |
Collapse
|
2
|
De Carvalho B, Dory E, Trus C, Pirson J, Germain L, Lecloux G, Lambert F, Rompen E. Biological performance of a novel bovine hydroxyapatite in a guided bone regeneration model: A preclinical study in a mandibular defect in dogs. Clin Implant Dent Relat Res 2024; 26:183-196. [PMID: 37789642 DOI: 10.1111/cid.13260] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 06/21/2023] [Accepted: 07/29/2023] [Indexed: 10/05/2023]
Abstract
OBJECTIVES This preclinical model study aims to evaluate the performance and safety of a novel hydroxyapatite biomaterial (Wishbone Hydroxyapatite, WHA) on guided bone regeneration compared to a commercially available deproteinized bovine bone mineral (Bio-Oss, BO). MATERIAL AND METHODS Twenty-four beagle dogs were allocated to three timepoint cohorts (4, 12, and 26 weeks) of eight animals each. In all animals, four critical-sized, independent wall mandibular defects were created (32 defects/cohort). Each animal received all four treatments, allocated randomly to separated defects: WHA + collagen membrane (M), BO + M, no treatment (Sham, Sh), and Sh + M. At each timepoint, the specimens were harvested for histologic and histomorphometric analyses to determine the newly formed bone and osteoconductivity. RESULTS At 4 weeks, bone regeneration was significantly higher for WHA + M (46.8%) when compared to BO + M (21.4%), Sh (15.1%), and Sh + M (23.1%) (p < 0.05); at 12 and 26 weeks, regeneration was similar for WHA and BO. Bone-to-material contact increased over time similarly for WHA + M and BO + M. From a safety point of view, inflammation attributed to WHA + M or BO + M was minimal; necrosis or fatty infiltrate was absent. CONCLUSIONS WHA + M resulted in higher bone regeneration rate than BO + M at 4 weeks. Both BO + M and WHA + M were more efficient than both Sh groups at all timepoints. Safety and biocompatibility of WHA was favorable and comparable to that of BO.
Collapse
Affiliation(s)
- Bruno De Carvalho
- Department of Periodontology, Oro-Dental and Implant Surgery, Dental Biomaterial Research Unit, Liège, Belgium
| | | | | | | | | | - Geoffrey Lecloux
- Department of Periodontology, Oro-Dental and Implant Surgery, Dental Biomaterial Research Unit, Liège, Belgium
| | - France Lambert
- Department of Periodontology, Oro-Dental and Implant Surgery, Dental Biomaterial Research Unit, Liège, Belgium
| | | |
Collapse
|
3
|
Jeyapalina S, Hillas E, Beck JP, Agarwal J, Shea J. Fluorapatite and fluorohydroxyapatite apatite surfaces drive adipose-derived stem cells to an osteogenic lineage. J Mech Behav Biomed Mater 2021; 125:104950. [PMID: 34740011 DOI: 10.1016/j.jmbbm.2021.104950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 10/18/2021] [Accepted: 10/27/2021] [Indexed: 10/20/2022]
Abstract
PURPOSE Hydroxyapatite (HA) scaffolds are common replacement materials used in the clinical management of critical-sized bone defects. This study was undertaken to examine the potential benefits of fluoridated derivatives of hydroxyapatite, fluorapatite (FA), and fluorohydroxyapatite (FHA) as bone scaffolds in conjunction with adipose-derived stem cells (ADSCs). If FHA and FA surfaces could drive the differentiation of stem cells to an osteogenic phenotype, the combination of these ceramic scaffolds with ADSCs could produce materials with mechanical strength and remodeling potential comparable to autologous bone. This study was designed to investigate the ability of the apatite surfaces HA, FA, and FHA produced at different sintering temperatures to drive ADSCs toward osteogenic lineages. METHODS HA, FHA, and FA surfaces sintered at 1150 °C and 1250 °C were seeded with ADSCs and evaluated for cell growth and gene and protein expression of osteogenic markers at 2 and 10 days post-seeding. RESULTS In vitro, ADSC cells were viable on all surfaces; however, differentiation of these cells into osteoblastic lineage only observed in apatite surfaces. ADSCs seeded on FA and FHA expressed genes and proteins related to osteogenic differentiation markers to a greater extent by Day 2 when compared to HA and cell culture controls. By day 10, HA, FA, and FHA all expressed more bone differentiation markers compared to cell culture controls. CONCLUSION FA and FHA apatite scaffolds may promote the differentiation of ADSCs at an earlier time point than HA surfaces. Combining apatite scaffolds with ADSCs has the potential to improve bone regeneration following bone injury.
Collapse
Affiliation(s)
- Sujee Jeyapalina
- Division of Plastic Surgery, Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA; Orthopaedic and Plastic Surgery Research Laboratory, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, 84148, USA; Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA
| | - Elaine Hillas
- Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA
| | - James Peter Beck
- Orthopaedic and Plastic Surgery Research Laboratory, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, 84148, USA; Department of Orthopaedics, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA
| | - Jayant Agarwal
- Division of Plastic Surgery, Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA; Orthopaedic and Plastic Surgery Research Laboratory, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, 84148, USA; Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA
| | - Jill Shea
- Orthopaedic and Plastic Surgery Research Laboratory, George E. Wahlen Department of Veterans Affairs Medical Center, Salt Lake City, UT, 84148, USA; Department of Surgery, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA.
| |
Collapse
|
4
|
Jones JR, Gibson IR. Ceramics, Glasses, and Glass-Ceramics. Biomater Sci 2020. [DOI: 10.1016/b978-0-12-816137-1.00022-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
5
|
De Carvalho B, Rompen E, Lecloux G, Schupbach P, Dory E, Art JF, Lambert F. Effect of Sintering on In Vivo Biological Performance of Chemically Deproteinized Bovine Hydroxyapatite. MATERIALS 2019; 12:ma12233946. [PMID: 31795201 PMCID: PMC6926783 DOI: 10.3390/ma12233946] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 11/23/2019] [Accepted: 11/25/2019] [Indexed: 11/16/2022]
Abstract
The influence of the manufacturing process on physicochemical properties and biological performance of xenogenic biomaterials has been extensively studied, but its quantification on bone-to-material contact remains poorly investigated. The aim of this study was to investigate the effect of different heat treatments of an experimental chemically-deproteinized bovine hydroxyapatite in vivo in terms of new bone formation and osteoconductivity. Protein-free hydroxyapatite from bovine origin was produced under sub-critical conditions and then either sintered at 820 °C or 1200 °C. Structural and morphological properties were assessed by scanning electron microscopy (SEM), measurement of surface area and X-ray diffractometry (XRD). The materials were then implanted in standardized alveolar bone defects in minipigs and histomorphometric evaluations were performed using non-decalcified sections. Marked topographical differences were observed by SEM analysis. As the sintering temperature of the experimental material increased, the surface area significantly decreased while crystallite size increased. In vivo samples showed that the highly sintered BHA presented a significantly lower percentage of newly formed bone than the unheated one (p = 0.009). In addition, the percentage of bone-to-material contact (BMC) was significantly lowered in the highly sintered group when compared to the unsintered (p = 0.01) and 820 °C sintered (p = 0.02) groups. Non-sintered or sintered at 820 °C BHA seems to maintain a certain surface roughness allowing better bone regeneration and BMC. On the contrary, sintering of BHA at 1200 °C has an effect on its morphological and structural characteristics and significantly modify its biological performance (osteoconductivity) and crystallinity.
Collapse
Affiliation(s)
- Bruno De Carvalho
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
| | - Eric Rompen
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
| | - Geoffrey Lecloux
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
| | - Peter Schupbach
- Adjunct Professor, Augusta University, Augusta, GA 1120, USA;
| | - Emilie Dory
- Department of Biomaterials, WishBone SA, 4000, Liège, Belgium; (E.D.); (J.-F.A.)
| | - Jean-François Art
- Department of Biomaterials, WishBone SA, 4000, Liège, Belgium; (E.D.); (J.-F.A.)
| | - France Lambert
- Department of Periodontology and Oral Surgery, University of Liège, 4000 Liège, Belgium; (B.D.C.); (E.R.); (G.L.)
- Correspondence:
| |
Collapse
|
6
|
Harja M, Ciobanu G. Studies on adsorption of oxytetracycline from aqueous solutions onto hydroxyapatite. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 628-629:36-43. [PMID: 29428858 DOI: 10.1016/j.scitotenv.2018.02.027] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 02/02/2018] [Accepted: 02/02/2018] [Indexed: 05/28/2023]
Abstract
The presence of antibiotics in the water and wastewater has raised problems due to potential impacts on the environment and consequently their removal is of great importance. For this reason, this article aims to perform a study on the possibility of oxytetracycline (OTC) adsorption from aqueous medium by using the hydroxyapatite (HA) nanopowders as adsorbent materials. The hydroxyapatite nanopowders were synthesized by wet precipitation method by using orthophosphoric acid and calcium hydroxide as raw materials and investigated by XRD, SEM-EDX, FTIR and BET methods. The uncalcined and calcined hydroxyapatite samples have hexagonal crystal structure with crystal sizes smaller than 100nm and a specific surface area of 316m2/g and 139m2/g, respectively. The adsorption behavior of oxytetracycline, a zwitterionic antibiotic, on nanohydroxyapatite was investigated as a function of pH, contact time, adsorbent dosage and drug concentration by means of batch adsorption experiments. High oxytetracycline removal rates of about 97.58% and 89.95% for the uncalcined and calcined nanohydroxyapatites, respectively, were obtained at pH8 and ambient temperature. The adsorption process of oxytetracycline onto nanohydroxyapatite samples was found to follow a pseudo-second order and intraparticle diffusion kinetic models. The maximum adsorption capacities of 291.32mg/g and 278.27mg/g for uncalcined and calcined nanohydroxyapatite samples, respectively, have been found. The adsorption mechanism of OTC on the hydroxyapatite surface at pH8 can be established via surface complexation. The obtained results are indicative of good hydroxyapatite adsorption ability towards oxytetracycline drug.
Collapse
Affiliation(s)
- Maria Harja
- "Gheorghe Asachi" Technical University of Iasi, Prof. dr. docent Dimitrie Mangeron Rd., no. 73, Iasi 700050, Romania
| | - Gabriela Ciobanu
- "Gheorghe Asachi" Technical University of Iasi, Prof. dr. docent Dimitrie Mangeron Rd., no. 73, Iasi 700050, Romania.
| |
Collapse
|
7
|
Abstract
Rapid prototyping (RP) technologies have found many uses in dentistry, and especially oral and maxillofacial surgery, due to its ability to promote product development while at the same time reducing cost and depositing a part of any degree of complexity theoretically. This paper provides an overview of RP technologies for maxillofacial reconstruction covering both fundamentals and applications of the technologies. Key fundamentals of RP technologies involving the history, characteristics, and principles are reviewed. A number of RP applications to the main fields of oral and maxillofacial surgery, including restoration of maxillofacial deformities and defects, reduction of functional bone tissues, correction of dento-maxillofacial deformities, and fabrication of maxillofacial prostheses, are discussed. The most remarkable challenges for development of RP-assisted maxillofacial surgery and promising solutions are also elaborated.
Collapse
Affiliation(s)
- Qian Peng
- Xiangya Stomatological Hospital, Central South University , Changsha, Hunan 410008 , China
| | | | | | | |
Collapse
|
8
|
|
9
|
Gallegos-Nieto E, Medellín-Castillo HI, de Lange DF. A complete structural performance analysis and modelling of hydroxyapatite scaffolds with variable porosity. Comput Methods Biomech Biomed Engin 2014; 18:1225-1237. [DOI: 10.1080/10255842.2014.889690] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
10
|
Asanithi P. Surface porosity and roughness of micrographite film for nucleation of hydroxyapatite. J Biomed Mater Res A 2013; 102:2590-9. [DOI: 10.1002/jbm.a.34930] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Accepted: 08/16/2013] [Indexed: 11/08/2022]
Affiliation(s)
- Piyapong Asanithi
- Department of Physics, Faculty of Science; King Mongkut's University of Technology Thonburi; Bangkok 10140 Thailand
| |
Collapse
|
11
|
|
12
|
Influence of raw powder preparation routes on properties of hydroxyapatite fabricated by 3D printing technique. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2010. [DOI: 10.1016/j.msec.2010.02.014] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
|
13
|
|
14
|
Prabakaran K, Rajeswari S. Spectroscopic investigations on the synthesis of nano-hydroxyapatite from calcined eggshell by hydrothermal method using cationic surfactant as template. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 74:1127-1134. [PMID: 19836296 DOI: 10.1016/j.saa.2009.09.021] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2009] [Revised: 08/13/2009] [Accepted: 09/12/2009] [Indexed: 05/28/2023]
Abstract
The present work reports the successful synthesis of nano-hydroxyapatite, Ca(10)(PO(4))(6)(OH)(2) (denoted HAP) from calcined eggshell by hydrothermal method using cationic surfactant (CTAB) as regulator of nucleation and crystal growth. The reaction involved in the synthesis was studied elaborately. The influence of reaction temperature, ageing time and CTAB concentration on the synthesis of nano-HAP are also studied in addition to the effect of sintering temperature on the crystal growth. Spectral characterization involving Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD) techniques were performed for functional group analysis and phase identification of the materials, respectively. Thermal stability of nano-HAP was investigated by thermal analysis (TG/DTA). The physical characteristics, such as morphology and particle size of the synthesized nano-HAP were assessed thoroughly by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The results have revealed that well-crystallized nano-HAP was synthesized by hydrothermal treatment at 160 degrees C for 10 h with the addition of CTAB at critical micelle concentration (CMC). It was also found that the synthesized nano-HAP was thermally stable up to 1100 degrees C.
Collapse
Affiliation(s)
- K Prabakaran
- Department of Analytical Chemistry, University of Madras, Guindy Campus, Chennai, Tamilnadu 600 025, India.
| | | |
Collapse
|
15
|
Nagasaki KI, Ikoma T, Katsuda SI, Tonegawa T, Tanaka J, Nakamura T, Sato H, Ito S, Sasaki N, Agui T. Sustained efficacy of erythropoietin with a hydroxyapatite carrier administered in mice. J Vet Med Sci 2009; 71:729-36. [PMID: 19578280 DOI: 10.1292/jvms.71.729] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
For chronic kidney disease patients with renal anemia, recombinant human erythropoietin (rHuEPO) is a very effective drug; however, the treatment regime is troublesome, requiring multiple administrations each week. In the present study, we examined the efficiency of hydroxyapatite (HAp) as a drug delivery carrier for the sustained release of erythropoietin (EPO) to reduce the frequency of administration. Spray-dried HAp microparticles, formed from zinc-containing HAp (Zn-HAp) and Zn-HAp calcined at 400 degrees C, were used as carriers of EPO, and five Zn-HAp formulation samples incorporating EPO were prepared; no formulation, poly-L-lactic acid (PLA) formulation, zinc (Zn) formulation, Zn/PLA formulation, and calcined/Zn/PLA formulation. ICR mice were administered these samples or commercial rHuEPO (Epogin) as a control from dorsal neck subcutaneous, and hematological and histopathological analyses, including enzyme-linked immunosorbent assay for plasma EPO concentration, were performed. An increase in the blood EPO level was detected on days 3 and 8 post-administration. Peak hematopoiesis was delayed and higher hematological values were obtained on day 14 post-administration with no serious adverse reactions compared with the control. The Zn/PLA formulation sample was found to be most effective in reducing the initial peak while sustaining the delayed release of EPO. In conclusion, the Zn-HAp formulation samples were considered to be useful carriers for the sustained release of EPO, and the Zn/PLA formulation appears to be the most effective of five Zn-HAp formulation samples in sustaining EPO release.
Collapse
Affiliation(s)
- Ken-Ichi Nagasaki
- Laboratory of Laboratory Animal Science and Medicine, Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Wang AJ, Lu YP, Zhu RF, Li ST, Ma XL. Effect of process parameters on the performance of spray dried hydroxyapatite microspheres. POWDER TECHNOL 2009. [DOI: 10.1016/j.powtec.2008.10.020] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
17
|
Manafi SA, Yazdani B, Rahimiopour MR, Sadrnezhaad SK, Amin MH, Razavi M. Synthesis of nano-hydroxyapatite under a sonochemical/hydrothermal condition. Biomed Mater 2008; 3:025002. [DOI: 10.1088/1748-6041/3/2/025002] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
18
|
Chumnanklang R, Panyathanmaporn T, Sitthiseripratip K, Suwanprateeb J. 3D printing of hydroxyapatite: Effect of binder concentration in pre-coated particle on part strength. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2007. [DOI: 10.1016/j.msec.2006.11.004] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
19
|
Wilson CE, Kruyt MC, de Bruijn JD, van Blitterswijk CA, Oner FC, Verbout AJ, Dhert WJA. A new in vivo screening model for posterior spinal bone formation: Comparison of ten calcium phosphate ceramic material treatments. Biomaterials 2006; 27:302-14. [PMID: 16111745 DOI: 10.1016/j.biomaterials.2005.06.041] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2005] [Accepted: 06/30/2005] [Indexed: 11/19/2022]
Abstract
This study presents a new screening model for evaluating the influence of multiple conditions on the initial process of bone formation in the posterior lumbar spine of a large animal. This model uses cages designed for placement on the decorticated transverse process of the goat lumbar spine. Five conduction channels per cage, each be defined by a different material treatment, are open to both the underlying bone and overlying soft tissue. The model was validated in ten adult Dutch milk goats, with each animal implanted with two cages containing a total of ten calcium phosphate material treatments according to a randomized complete block design. The ten calcium phosphate ceramic materials were created through a combination of material chemistry (BCP, TCP, HA), sintering temperature (low, medium, high), calcination and surface roughness treatments. To monitor the bone formation over time, fluorochrome markers were administered at 3, 5 and 7 weeks and the animals were sacrificed at 9 weeks after implantation. Bone formation in the conduction channels was investigated by histology and histomorphometry of non-decalcified sections using traditional light and epifluorescent microscopy. According to both observed and measured bone formation parameters, materials were ranked in order of increasing magnitude as follows: low sintering temperature BCP (rough and smooth) approximately medium sintering temperature BCP approximately = TCP > calcined low sintering temperature HA > non-calcined low sintering temperature HA > high sintering temperature BCP (rough and smooth) > high sintering temperature HA (calcined and non-calcined). These results agree closely with those obtained in previous studies of osteoconduction and bioactivity of ceramics thereby validating the screening model presented in this study.
Collapse
Affiliation(s)
- Clayton E Wilson
- Department of Orthopaedics, G05.228, University Medical Center, P.O. Box 85500, NL 3508 GA, Utrecht, The Netherlands.
| | | | | | | | | | | | | |
Collapse
|
20
|
Abstract
Nanocomposites of hydroxyapatite / chondroitin sulfate or hyaluronic acid were prepared by a wet method through a self-organization. In the nanocomposites, the c-axis of hydroxyapatite nanocrystals was oriented along the longitudinal axis of the aggregations. The spherical porous microparticles by using a spray drying method were developed with the size range of 1.0 to 20 µm, specific surface area of c.a. 100 m2g-1 and porosities of over 60vol%. No thermal decomposition of polysaccharides was occurred through the spray drying processes. It is note worth that the zeta-potential of the microparticles were gradually changed to be negative value of -35mV against the content of polysaccharides. The animal experiments implanted under the skin showed that the HAp/ChS had a good biocompatibility for 4 week implantations. The spherical microparticles will be applicable to create more complicated composites and drug carriers.
Collapse
|
21
|
Joseph R, Tanner KE. Effect of Morphological Features and Surface Area of Hydroxyapatite on the Fatigue Behavior of Hydroxyapatite−Polyethylene Composites. Biomacromolecules 2005; 6:1021-6. [PMID: 15762673 DOI: 10.1021/bm0493180] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The effect of surface area and morphological features of filler particles on the fatigue behavior of hydroxyapatite-filled high-density polyethylene composites was studied. Composites containing 40 vol % filler were injection-molded into tensile bars, gamma-irradiated, and subjected to sinusoidal tensile fatigue at a frequency of 2 Hz. To simulate the physiological environment, the tests were conducted at 37 degrees C in saline. Results showed that properties such as secant modulus, cyclic energy dissipation, dynamic creep strain, hysteresis loops, and even fracture surfaces differ depending on the morphology and surface area of the fillers used.
Collapse
Affiliation(s)
- Roy Joseph
- IRC in Biomedical Materials, Queen Mary University of London, Mile End Road, London, E1 4NS United Kingdom.
| | | |
Collapse
|
22
|
|