151
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Zhang Y, Xu G, Wei X, Ren Z, Liu Y, Shen G, Han G. Hydrothermal synthesis, characterization and formation mechanism of self-assembled mesoporous SrTiO3 spheres assisted with Na2SiO3·9H2O. CrystEngComm 2012. [DOI: 10.1039/c2ce06655f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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152
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Xiao Z, Ren Z, Xia Y, Liu Z, Xu G, Li X, Shen G, Han G. Doping and phase transformation of single-crystal pre-perovskite PbTiO3 fibers with TiO6 edge-shared octahedra. CrystEngComm 2012. [DOI: 10.1039/c2ce25104c] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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153
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Xu G, Yang X, Hua C, He J, Ren Z, Weng W, Du P, Shen G, Han G. Shape-controlled synthesis of lead zirconate titanate nanocrystallites, microrods, microrolls and 3D complex architectures via the effects of poly-vinylalcohol macromolecular conformation. CrystEngComm 2012. [DOI: 10.1039/c2ce25637a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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154
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Wang H, Lin W, Shen G, Nomeir AA, Khor TO, Kong AN. Development and Validation of an LC-MS-MS Method for the Simultaneous Determination of Sulforaphane and its Metabolites in Rat Plasma and its Application in Pharmacokinetic Studies. J Chromatogr Sci 2011; 49:801-6. [DOI: 10.1093/chrsci/49.10.801] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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155
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Cheng J, Yu H, Wang X, Wu Y, Shen G. Primary oral and maxillofacial liposarcoma: a clinicopathological and immunohistochemical study of 11 cases. Int J Oral Maxillofac Surg 2011. [DOI: 10.1016/j.ijom.2011.07.147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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156
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Wang J, Zhou B, Lai Q, Wang Y, Shen G, Wang Z, Chen J, Hou J. Clinical and virological characteristics of chronic hepatitis B with concurrent hepatitis B E antigen and antibody detection. J Viral Hepat 2011; 18:646-52. [PMID: 20636332 DOI: 10.1111/j.1365-2893.2010.01345.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The concurrent detection of hepatitis B e antigen (HBeAg) and its corresponding antibody (anti-HBe) in patients with chronic hepatitis B virus (HBV) infection is well established but the clinical features remain poorly understood. Demographic information, clinical and laboratory data were collected from 1624 consecutive inpatient records of patients with chronic hepatitis B. Viral genotype, basic core promoter and precore mutations were determined by direct sequencing. In vitro HBeAg and anti-HBe binding experiments were conducted with three pairs of HBeAg-positive and anti-HBe-positive serum samples, which were mixed at variable ratios and incubated at 37°C for 3-24h. Of the 1624 chronic patients, 169 (10.4%) had concurrent HBeAg and anti-HBe positivity, and this was associated with intermediate age and HBV-DNA load, higher alanine aminotransferase level and more pronounced liver damage compared with HBeAg-positive or anti-HBe-positive patients alone. HBeAg and anti-HBe titres (median and interquartile range, S/CO) in the concurrent positive group were 4.2 (1.8-9.6) and 0.54 (0.27-0.72), which were closer to their respective cut-off values than those of HBeAg-positive or anti-HBe-positive groups alone. For the cases successfully sequenced, 110/134 (82.1%) harboured T1762/A1764 or/and A1896 mutants. The binding experiments showed that HBeAg and anti-HBe could be concurrently observed provided an optimal ratio (HBeAg to anti-HBe) was chosen. In antiviral treatment-naive patients, concurrence of HBeAg and anti-HBe was not uncommon, and such patients had profound liver disease. An optimal ratio between HBeAg and anti-HBe led to their concurrent detection when sera were tested by sensitive assays.
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Lu Y, Zhang YL, Shen G, Zhang L, Wang L, Qiu GH, Wu YZ, Yang M, Li MH. [Clinical study on viral hepatitis combined with aplastic anemia]. ZHONGHUA SHI YAN HE LIN CHUANG BING DU XUE ZA ZHI = ZHONGHUA SHIYAN HE LINCHUANG BINGDUXUE ZAZHI = CHINESE JOURNAL OF EXPERIMENTAL AND CLINICAL VIROLOGY 2011; 25:283-285. [PMID: 22097608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVE To study the clinical features, outcomes and treatments of viral hepatitis combined with aplastic anemia. METHODS 25 cases diagnosed as viral hepatits combined with aplastic anemia in Beijing Ditan Hsopital between April 2004 and September 2009 were retrospectively analyzed. In this group of patients aplastic anemia was finally diagnosed by bone marrow aspiration. We collected clinical data of these patients, including a history of liver disease, drug allergies, hospital medication history, laboratory data, and then performed descriptive analysis. RESULTS 25 patients with viral hepatitis were diagnosed as complicated with aplastic anemia by histopathological data. Among these patients, 17 were male and 8 were women. Viral hepatitis included: chronic hepatitis B (12 cases), chronic hepatitis C (4 cases), acute hepatits E (1 case), hepatitis caused by CMV infection (1 case), and unclassified hepatitis (7 cases). Among these patients, 7 were diagnosed as severe hepatits. Considering previous history, only 3 patients had history of short term interferon therapy before hospitalization, and the remaining patients did not use drug that affects blood system. Treatments were as followings: using colony stimulating factor in 6 patients, gamma globulin in 9 patients, glucocorticoids in 3 patients, erythropoietin in 1 patient, only oral drug to raise erythrocytes in 2 patients, red blood cells transfusion in 6 patients, platelets transfusion in 2 patients. As for clinical outcomes, 20 patients acquired improved condition and were dicharged, 3 patients were discharged voluntarily and 2 patients died of severe hepatits combined with other complications. CONCLUSION Main treatments of viral hepatitis combined with aplastic anemia were to treat primary hepatopathy and nucleoside analogue-based antiviral therapy, to provide symptomatic and supportive treatment for blood diseases. Blood diseases would recover simultaneously while liver disease was improved, and the prognosis was good.
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MESH Headings
- Adolescent
- Adult
- Aged
- Anemia, Aplastic/complications
- Anemia, Aplastic/diagnosis
- Anemia, Aplastic/virology
- Child
- Child, Preschool
- Female
- Hepatitis Viruses/genetics
- Hepatitis Viruses/isolation & purification
- Hepatitis, Viral, Human/complications
- Hepatitis, Viral, Human/diagnosis
- Hepatitis, Viral, Human/virology
- Humans
- Male
- Middle Aged
- Retrospective Studies
- Young Adult
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158
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Li Q, Cheng K, Weng W, Song C, Du P, Shen G, Han G. Room-temperature nonequilibrium growth of controllable ZnO nanorod arrays. NANOSCALE RESEARCH LETTERS 2011; 6:477. [PMID: 21794165 PMCID: PMC3211990 DOI: 10.1186/1556-276x-6-477] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Accepted: 07/27/2011] [Indexed: 05/15/2023]
Abstract
In this study, controllable ZnO nanorod arrays were successfully synthesized on Si substrate at room temperature (approx. 25°C). The formation of controllable ZnO nanorod arrays has been investigated using growth media with different concentrations and molar ratios of Zn(NO3)2 to NaOH. Under such a nonequilibrium growth condition, the density and dimension of ZnO nanorod arrays were successfully adjusted through controlling the supersaturation degree, i.e., volume of growth medium. It was found that the wettability and electrowetting behaviors of ZnO nanorod arrays could be tuned through variations of nanorods density and length. Moreover, its field emission property was also optimized by changing the nanorods density and dimension.
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159
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Jing D, Cai J, Shen G, Huang J, Li F, Li J, Lu L, Luo E, Xu Q. The preventive effects of pulsed electromagnetic fields on diabetic bone loss in streptozotocin-treated rats. Osteoporos Int 2011; 22:1885-95. [PMID: 20976595 DOI: 10.1007/s00198-010-1447-3] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/14/2010] [Accepted: 09/28/2010] [Indexed: 01/26/2023]
Abstract
UNLABELLED The present study was the first report demonstrating that pulsed electromagnetic field (PEMF) could partially prevent bone strength and architecture deterioration and improve the impaired bone formation in streptozotocin-induced diabetic rats. The findings indicated that PEMF might become a potential additive method for inhibiting diabetic osteopenia or osteoporosis. INTRODUCTION Diabetes mellitus (DM) can cause various musculoskeletal abnormalities. Optimal therapeutic methods for diabetic bone complication are still lacking. It is essential to develop more effective and safe therapeutic methods for diabetic bone disorders. Pulsed electromagnetic field (PEMF) as an alternative noninvasive method has proven to be effective for treating fracture healing and osteoporosis in non-diabetic conditions. However, the issue about the therapeutic effects of PEMF on diabetic bone complication has not been previously investigated. METHODS We herein systematically evaluated the preventive effects of PEMF on diabetic bone loss in streptozotocin-treated rats. Two similar experiments were conducted. In each experiment, 16 diabetic and eight non-diabetic rats were equally assigned to the control, DM, and DM + PEMF group. DM + PEMF group was subjected to daily 8-h PEMF exposure for 8 weeks. RESULTS In experiment 1, three-point bending test suggested that PEMF improved the biomechanical quality of diabetic bone tissues, evidenced by increased maximum load, stiffness, and energy absorption. Microcomputed tomography analysis demonstrated that DM-induced bone architecture deterioration was partially reversed by PEMF, evidenced by increased Tb.N, Tb.Th, BV/TV, and Conn.D and reduced Tb.Sp and SMI. Serum OC analysis indicated that PEMF partially prevented DM-induced decrease in bone formation. In experiment 2, no significant difference in the bone resorption marker TRACP5b was observed. These biochemical findings were further supported by the dynamic bone histomorphometric parameters BFR/BS and Oc.N/BS. CONCLUSIONS The results demonstrated that PEMF could partially prevent DM-induced bone strength and architecture deterioration and improve the impaired bone formation. PEMF might become a potential additive method for inhibiting diabetic osteoporosis.
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160
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Wang X, Lu Y, Shen G, Chen W. One germline mutation of PTCH gene in a Chinese family with non-syndromic keratocystic odontogenic tumours. Int J Oral Maxillofac Surg 2011; 40:829-33. [PMID: 21507611 DOI: 10.1016/j.ijom.2011.03.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2010] [Accepted: 03/18/2011] [Indexed: 10/18/2022]
Abstract
Keratocystic odontogenic tumours (KOCTs) are common benign cystic tumours that arise sporadically or associated with nevoid basal cell carcinoma syndrome (NBCCS). PTCH mutation can be found in sporadically or NBCCS associated KOCTs. Few PTCH mutations in families with non-syndromic KOCTs have been reported. Through PCR and gene sequence analysis, the authors discovered one missense mutation c.3277G>C in exon 19 of PTCH gene in a Chinese family with non-syndromic KOCTs. This mutation causes one highly conserved glycine residue transit to arginine on the 10th transmembrane region of PTCH protein. This work revealed that the missense mutation of PTCH is the causative and dominant gene of KOCTs in this family.
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161
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Wang Y, Shen G, Rivers M, Sutton S. A Multi-Anvil High Pressure System with Synchrotron X-Ray Probe: New Opportunities for In-Situ Materials Research at Simultaneously High Pressure and Temperature. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-499-289] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTWe describe the multi-anvil, large-volume, high-pressure facility that is being constructed at the GeoSoilEnviroCARS (Sector 13) at the Advanced Photon Source, Argonne National Laboratory. Various multi-anvil, high-pressure apparatus will be used to cover pressure and temperature conditions up to 40 GPa and 3000 °C, respectively, with milimeter to centimeter sized samples. This national facility is open to all users, providing excellent opportunities for high pressure, high temperature experiments.
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162
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Xu G, He W, Zhao Y, Liu Y, Ren Z, Shen G, Han G. Hydrothermal synthesis, characterization and growth mechanism of single crystal lead titanate pyrochlore dendrites. CrystEngComm 2011. [DOI: 10.1039/c0ce00561d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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163
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Xiao Z, Ren Z, Liu Z, Wei X, Xu G, Liu Y, Li X, Shen G, Han G. Single-crystal nanofibers of Zr-doped new structured PbTiO3: hydrothermal synthesis, characterization and phase transformation. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm04212a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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164
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Tang GH, Xu J, Chen RJ, Qian YF, Shen G. Lithium delivery enhances bone growth during midpalatal expansion. J Dent Res 2010; 90:336-40. [PMID: 21118797 DOI: 10.1177/0022034510389180] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Lithium is an activator of β-catenin signaling, and β-catenin mediates bone acquisition in response to mechanical loading in the bone. We tested the hypothesis that lithium enhances new bone formation during midpalatal suture expansion. Forty-eight Wistar rats with or without suture expansion were gavage-fed daily with lithium chloride or sodium chloride. We labeled the rats with bromodeoxyuridine to evaluate the proliferation and differentiation of the osteoprogenitors. Lithium increased β-catenin expression and cell proliferation in expanding sutures. Initial delay in the differentiation of osteoprogenitors into mature osteoblasts by lithium treatment corresponded with expansion of pre-osteoblasts, which preceded the increase of new bone formation in the suture. These results suggested that β-catenin regulates proliferation of osteoprogenitors and maturation of osteoblasts during midpalatal suture expansion osteogenesis, and that lithium enhances bone regeneration by elevating β-catenin expression. Lithium treatment could be a pharmaceutical aid to improve the stability of orthodontic treatment like rapid palatal expansion.
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165
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Ren Z, Xu G, Liu Y, Wei X, Zhu Y, Zhang X, Lv G, Wang Y, Zeng Y, Du P, Weng W, Shen G, Jiang JZ, Han G. PbTiO3 nanofibers with edge-shared TiO6 octahedra. J Am Chem Soc 2010; 132:5572-3. [PMID: 20364814 DOI: 10.1021/ja1011614] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new tetragonal phase of PbTiO(3) was discovered, in which each TiO(6) octahedron pair shares an edge and stacks over following pairs in an interlaced manner to form a one-dimensional (1D) columned structure along the c-axis. This new tetragonal phase of PbTiO(3) transforms into a normal perovskite phase in air at elevated temperature.
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166
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Zhao R, Moghadasian M, Mizuno T, Shen G. Abstract: P192 ROLE OF HEAT SHOCK FACTOR-1 (HSF1) IN UPREGULATION OF PLASMINOGEN ACTIVATOR INHIBITOR-1 IN DIABETIC, APOLIPOPROTEIN E-KNOCKOUT MICE AND FIBROBLASTS FROM HSF1-DEFICIENT MICE. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)70499-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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167
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Sangle G, Zhao R, Mizuno T, Shen G. Abstract: P244 INVOLVEMENT OF RAGE, NADPH OXIDASE AND H-RAS/RAF-1 IN GLYCATED LDL-INDUCED EXPRESSION OF HEAT SHOCK FACTOR-1 AND PLASMINOGEN ACTIVATOR INHIBITOR-1 IN VASCULAR ENDOTHELIAL CELLS. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)70539-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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168
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Chowdhury SR, Sangle G, Xie X, Shen G. Abstract: P275 EFFECTS OF OXIDIZED OR GLYCATED LDL ON MITOCHONDRIAL RESPIRATORY CHAIN ACTIVITY AND ENZYMES IN ARTERIAL ENDOTHELIAL CELLS. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)70570-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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169
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Piper J, Shen G, Nelson AD, Nelson AS. SU-FF-I-92: Partial Volume Correction in PET Images: A Single Correction Method Applied for Multiple Source to Background Ratios. Med Phys 2009. [DOI: 10.1118/1.3181212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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170
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Luo M, Cheng K, Weng W, Song C, Du P, Shen G, Xu G, Han G. Size- and density-controlled synthesis of TiO2 nanodots on a substrate by phase-separation-induced self-assembly. NANOTECHNOLOGY 2009; 20:215605. [PMID: 19423936 DOI: 10.1088/0957-4484/20/21/215605] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
This work presents a facile way, i.e. phase-separation-induced self-assembly, to prepare TiO(2) nanodots on a substrate. This method induces convective flow in a spin-coated titanium tetrabutoxide (TBOT)/polyvinyl pyrrolidone (PVP)/ethanol liquid film through the Marangoni effect and turns TBOT into crystalline TiO(2) nanodots on a substrate after calcination. The size and density of the TiO(2) nanodots can be finely tailored by controlling the concentrations of TBOT and PVP in the precursor sol. The TiO(2) nanodot-deposited surface showed a hydrophilic characteristic and the wettability was obviously improved by increasing nanodot size.
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171
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Yu H, Shen G, Wang X, Zhang S, Fan X, Liu B. Surgical planning and simulation system for orthognathic surgery based on virtual reality. Int J Oral Maxillofac Surg 2009. [DOI: 10.1016/j.ijom.2009.03.584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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172
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Yu H, Shen G, Wang X, Zhang S. Application of computer-assisted navigation in the treatment of zygomatic-orbito-maxillary complex fractures. Int J Oral Maxillofac Surg 2009. [DOI: 10.1016/j.ijom.2009.03.415] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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173
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Luo M, Cheng K, Weng W, Song C, Du P, Shen G, Xu G, Han G. Enhanced Luminescence of Eu-Doped TiO2Nanodots. NANOSCALE RESEARCH LETTERS 2009; 4:809-13. [PMID: 20596343 PMCID: PMC2894177 DOI: 10.1007/s11671-009-9319-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2009] [Accepted: 04/06/2009] [Indexed: 05/24/2023]
Abstract
Monodisperse and spherical Eu-doped TiO2nanodots were prepared on substrate by phase-separation-induced self-assembly. The average diameters of the nanodots can be 50 and 70 nm by changing the preparation condition. The calcined nanodots consist of an amorphous TiO2matrix with Eu3+ions highly dispersed in it. The Eu-doped TiO2nanodots exhibit intense luminescence due to effective energy transfer from amorphous TiO2matrix to Eu3+ions. The luminescence intensity is about 12.5 times of that of Eu-doped TiO2film and the luminescence lifetime can be as long as 960 μs.
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174
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Hu W, Shen F, Chen G, Shen G, Liu W, Zhou J. Possible involvement of brain tumour stem cells in the emergence of a fast-growing malignant meningioma after surgical resection and radiotherapy of high-grade astrocytoma: case report and preliminary laboratory investigation. J Int Med Res 2009; 37:240-6. [PMID: 19215696 DOI: 10.1177/147323000903700129] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The case of a 62-year old man diagnosed with radiation-induced meningioma (RIM) after treatment for astrocytoma with an unusually short latency period of 7 months is reported. The patient first presented with a 2-month history of memory decline. Magnetic resonance imaging (MRI) showed a tumour in the left parieto-temporal lobe. Gross total resection was performed and the tumour was confirmed to be an astrocytoma. The patient received cranial radiotherapy 2 weeks later, however 7 months after radiation treatment the patient presented with headache and vomiting. MRI showed massive meningeal enhancement in the left frontal lobe, which progressively enlarged. The patient's clinical condition deteriorated and a second craniotomy was performed with complete removal of the secondary tumour, which was shown to be a malignant meningioma. Immunohistochemical staining identified CD133-positive cells in both tumours. A rare fraction of brain tumour stem cells (BTSC) was isolated from the primary astrocytoma using a serum-free culture system, suggesting that BTSC may have been involved in the rapid emergence of RIM after resection and radiation of the primary astrocytoma.
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175
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Miao S, Weng W, Li Z, Cheng K, Du P, Shen G, Han G. Electrolytic deposition of octacalcium phosphate/collagen composite coating on titanium alloy. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2009; 20:131-134. [PMID: 18704651 DOI: 10.1007/s10856-008-3552-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2007] [Accepted: 07/21/2008] [Indexed: 05/26/2023]
Abstract
Osteointegration of titanium or its alloy with bone can be greatly improved by calcium phosphate coatings, and further enhanced by an extracellular matrix protein layer such as collagen. In this study, an octacalcium phosphate (OCP)/collagen composite coating layer on Ti6Al4V substrate was prepared using electrolytic deposition method. A layer of OCP mineral consisting of flake-like crystals was first formed on the Ti6Al4V substrate. Subsequently, mineralized collagen fibrils were deposited on the former OCP layer. These collagen fibrils were interconnected and well adhered on the OCP layer so that they were immobilized. The microstructure of the composite coating varied with collagen concentration in the electrolyte. This study could offer a possibility of fabricating a desired surface matrix on orthopedic implants to enhance bone formation and fixation of implants.
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