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    19 August 2016, Volume 20 Issue 34 Previous Issue    Next Issue
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    Effect of magnesium alloy scaffolds on osteoblast function
    Wang Yong-ping, Liu Xiao-rong, Zhang Bing-chun, He Yao-hua
    2016, 20 (34):  5021-5026.  doi: 10.3969/j.issn.2095-4344.2016.34.001
    Abstract ( 603 )   PDF (1491KB) ( 554 )   Save

    BACKGROUND: On the basis of the previous studies, the magnesium alloy is processed into porous scaffolds.
    OBJECTIVE: To investigate the effect of porous magnesium alloy scaffolds on osteoblast function.
    METHODS: MC3T3-E1 osteoblastic cell lines were seeded on the porous magnesium alloy scaffold or porous pure magnesium scaffold, respectively. After 6, 12 and 24 hours of incubation, the adhesion ability of osteoblasts on the scaffold was observed by acridine crange staining. At 1, 3 and 5 days after incubation, the proliferation ability of osteoblasts on the scaffold was evaluated by MTT assay; after 21-day incubation, the mineralization of osteoblasts was investigated using calcein staining.
    RESULTS AND CONCLUSION: The number of osteoblasts adherent to the porous magnesium alloy scaffold was significantly more than that adherent to the porous pure magnesium scaffold after 24-hour incubation (P < 0.05). And the proliferation assay showed that a significantly higher absorbance was observed on the porous magnesium alloy scaffold than that of the porous pure magnesium scaffold after 3 and 5 days of incubation (P < 0.05). Moreover, the number and area of mineralized nodules formed on the the porous magnesium alloy scaffold were greater than those on the porous pure magnesium scaffold after 21-day incubation (P < 0.05). These results show that the porous magnesium alloy scaffold with an excellent bioactivity can promote the adhesion, proliferation and mineralization abilities of osteoblasts.

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    Three-dimensional finite element analysis of dental implant combined with residual tooth after hemisection to support a mandibular molar
    Chen Jun-liang, He Yun, Huang Yue
    2016, 20 (34):  5027-5032.  doi: 10.3969/j.issn.2095-4344.2016.34.002
    Abstract ( 324 )   PDF (1431KB) ( 289 )   Save

    BACKGROUND: Tooth hemisection contributes to preserving partial tooth structure and periodontal ligament that are able to reduce the resorption of alveolar bone. However, the traditional fixed partial denture (FPD) for dental restoration after hemisection jeopardizes the health of abutment tooth. Given this, the use of dental implant offers a new option for tooth restoration.
    OBJECTIVE: To analyze the feasibility of preserving a mandibular molar after hemisection by combining an inserted dental implant with the residual tooth by means of finite element analysis.
    METHODS: Based on the image data of a volunteer, three models with different ways of restorations were created: the model of combining implant and residual tooth after hemisection to support a molar crown (combined model), the model of implant to support a molar crown (implant model) and the model of FPD. Densities of two kinds of spongy bones were assigned respectively. Vertical load of 100 N was applied on the prosthesis. Biomechanical properties of different models were analyzed.
    RESULTS AND CONCLUSION: (1) Displacement of the tooth and implant: As the decrease of the density of spongy bone, displacements of the tooth and implant increased in the combined model. The implant displacement was higher in the combined model as compared with the implant model. For the combined model, the implant displacement was lower than that of the residual tooth. (2) Stress in the cortical bone: Stress in the cortical bone in models with low-density spongy bone was higher than that in the corresponding models with high-density spongy bone. Under the condition of high-density spongy bone, the highest values were obtained in the implant model, followed by the combined model and FPD model. Under the condition of low-density spongy bone, the highest values were obtained in the combined model, followed by the implant model and FPD model. (3) Strain in the spongy bone: Strain in the spongy bone in models with low-density spongy bone was higher than that in the corresponding models with high-density spongy bone. Under the condition of high-density spongy bone, the highest values were obtained in the FPD model, followed by the combined model and implant model. Under the condition of low-density spongy bone, the highest values were obtained in the combined model, followed by the FPD model and implant model. From the biomechanical point of view, it can be concluded that the combined use of an implant and residual molar after tooth hemisection is an acceptable treatment option under the condition of high-density spongy bone.

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    A novel plastic homogeneous bone repair material for sport-related articular cartilage injury
    Ding Chen-guang, Fu Ping
    2016, 20 (34):  5033-5038.  doi: 10.3969/j.issn.2095-4344.2016.34.003
    Abstract ( 367 )   PDF (3662KB) ( 380 )   Save

    BACKGROUND: Currently, the components and preparation methods of plastic bone repair materials remain controversial, and rare studies focus on their repair effects on sport-related articular cartilage injury.
    OBJECTIVE: To analyze the effect of a novel plastic homogeneous bone repair material to repair sport-related articular cartilage injury.
    METHODS: Thirty-six New Zealand rabbits were selected to prepare articular cartilage injury models, and were randomized into two groups. Model rabbits were repaired with the novel plastic homogeneous bone material (a composite of demineralized bone matrix and collagen) as experimental group, while the others repaired with sodium hyaluronate gel as control group. At 3 weeks after repair, treadmill system was utilized to stimulate sports training after athlete injury, for five consecutive sessions of 30 minutes each. At 16, 18 and 20 weeks after repair, the defect region was observed histologically.
    RESULTS AND CONCLUSION: At 16 weeks after repair, the defect region healed well and integrated with the surrounding tissues, and no significant inflammatory reaction appeared around the material in the experimental group; in the control group, a fissure appeared at the defect region but with no inflammatory reaction, and the material integrated with the interstitial site. At 18 weeks after repair, closely arranged acellular bone matrix could be found in the defect region, fibrous connective tissues were fewer, and there was a new bone formation around the edge of host bone in the experimental group; the defect region healed, but new bones were fewer in the control group. At 20 weeks after repair, the defect region in the experimental group was filled with fibrous connective tissues, in which there were numerous new blood vessels, and a few of new tissues appeared around the edge of host bone; the defect region in the control group was improved and no neovascularization occurred. These findings suggest that the novel plastic homogeneous bone material can promote the repair of sport-related articular cartilage injury with less rejection reactions.

     

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    TiO2-xNx thin films on ceramic bracket surfaces: preparation and antibiotic performance
    Wang Jian-wei, Wang Yu, Che Yuan-qian, Zhu Bo-wu, Cao Bao-cheng
    2016, 20 (34):  5039-5044.  doi: 10.3969/j.issn.2095-4344.2016.34.004
    Abstract ( 460 )   PDF (4112KB) ( 349 )   Save

    BACKGROUND: Enamel demineralization has been plaguing doctors and patients in the fixed orthodontic treatment, so we attempt to seek an effective method of reducing its incidence.
    OBJECTIVE: To prepare TiO2-xNx thin films at different thicknesses on the ceramic bracket surface by sol-gel method followed by detection of antibiotic performance.
    METHODS: TiO2-xNx thin films at different thicknesses were prepared on the ceramic bracket surface by sol-gel method. The crystal structure, surface morphology and attachment force of these thin films were analyzed by X-ray diffraction, scanning electron microscope and multi-function material surface tester, respectively. The color changes of ceramic brackets before and after coating were evaluated through German VITA Easyshade Advance 4.0 photoelectric color comparator. Antibiotic performance of the ceramic bracket coated with TiO2-xNx thin film for Candida albicans and Streptococcus mutans was evaluated by the flat colony counting method.
    RESULTS AND CONCLUSION: The prepared TiO2-xNx thin film was anatase type, which had uniform and compact structure, and its X-ray diffraction peaks were elevated with the increase of film thickness. The attachment force of the thickest film was 18.37 N, indicating the thin film has a good adhesion to the ceramic bracket and can withstand the friction in the oral cavity. The antibiotic performance of TiO2-xNx thin film for Candida albicans and Streptococcus mutans was also enhanced as the thickness of the thin film tended to increase, while the color changes of the ceramic brackets coated with different thickness of TiO2-xNx thin films were not significant. To conclude, the ceramic bracket coated with TiO2-xNx film that does not affect the appearance has high antibacterial activity to common oral cariogenic bacteria and opportunistic pathogens, and the film can adhere well to the bracket.

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    Biological properties of nanohydroxyapatite composite for dental restoration
    Huang Tao, Chen Han
    2016, 20 (34):  5045-5050.  doi: 10.3969/j.issn.2095-4344.2016.34.005
    Abstract ( 407 )   PDF (3883KB) ( 303 )   Save

    BACKGROUND: Nanohydroxyapatite composition is similar to that of the natural bone, and because of its characteristics of nanomaterials, it has been widely used in the bone defect repair.
    OBJECTIVE: To observe the effect of nanohydroxyapatite composite materials in the repair of alveolar bone defect in animal models by detecting its cytotoxicity.
    METHODS: (1) In vitro experiment: nanohydroxyapatite extracts with concentrations of 10%, 50%, 100% (or hydroxyapatite leaching extracts) were used to culture periodontal ligament fibroblast-like cells and L-929 cells for 7 days, respectively, followed by cell cytotoxicity analysis. (2) In vivo experiment: 45 adult rabbits were used to make animal models of alveolar bone defects and then were randomized into three groups: experimental group implanted with nanohydroxyapatite, control group with hydroxyapatite, and blank control group with no implant material. New bone formation was observed at 1, 2 and 3 weeks after operation.
    RESULTS AND CONCLUSION: (1) In vitro experiment: after directly cultured with 10%, 50%, 100% nanohydroxyapatite extracts, the cell cytotoxicity was graded 0 to 1, indicating no presence of cytotoxicity. (2) In vivo experiment: in the three groups, the percentage of new bone area accounting for the total visual field was gradually in a rise over time. Moreover, the amount of new bone tissues was higher in the experimental group than the other two groups at different time (P < 0.05). These findings demonstrate that the nanohydroxyapatite materials have no cytotoxicity that can be used to promote the repair of alveolar bone defects.

     

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    Tissue-engineered acellular matrix material: preparation and application in articular cartilage repair
    Zhao Yu-guo, Li Ming-ming
    2016, 20 (34):  5051-5056.  doi: 10.3969/j.issn.2095-4344.2016.34.006
    Abstract ( 384 )   PDF (3910KB) ( 399 )   Save

    BACKGROUND: It has been reported that tissue-engineered acellular matrix can induce and promote epithelial cells and smooth muscle cells to evolve into a part of body in vivo compared with the normal extracellular matrix.
    OBJECTIVE: To investigate the effect of tissue-engineered acellular matrix in articular cartilage repair.
    METHODS: Totally 30 New Zealand rabbits were randomly allotted to fibroid tissue and acellular matrix groups (n=15 per group), and then articular cartilage defect models, 4 mm in diameter, were established at the white rabbit femoral condyle. Acellular cartilage matrix scaffold was prepared using bovine knee cartilage, and model rats in the acellular matrix group were repaired with acellular cartilage matrix scaffold and the others in the fibroid tissue group repaired with fibroid tissues. Finally, repair effects between two groups were compared.
    RESULTS AND CONCLUSION: The dark blue and porous tissue-engineered acellular matrix material could be found, with a diameter of 5 mm and moderate hardness, and exhibited certain flexibility after cross-linking. Hematoxylin-eosin staining showed that cell debris, blue-stained nuclear materials and residual extracellular matrix disappeared. Toluidine blue staining found that the porosity of the blue scaffold was 90%, and the swelling ratio was (1 314±337)%. The absorbance value in the acellular matrix group was significantly higher than that in the fibroid tissue group at 1, 3, 5, 7 and 9 days (P < 0.05). In the fibroid tissue group, defects filled with newborn fibrous scars were overt. By contrast, in the acellular matrix group, the white tissues covered the defect region with smooth surface, and the wound was basically healed, with an unclear boundary after 12 weeks. Moreover, blue-stained, small flattened cells appeared, subchondral bone structure was connected well with the cartilage, and the scaffold was directly degraded. In conclusion, the tissue-engineered acellular matrix material exhibits good biocompatibility, cell adsorption and hydrophilicity, and can promote the defect repair after articular cartilage injury. Therefore, it is a suitable substitute for articular cartilage repair.

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    Copper ion concentration and angiogenesis as two correlates to abnomal uterine bleeding caused by copper/low-density polyethylene nanocomposite intrauterine device
    Deng Ting, Li Qing, Chen Dan, Xie Xi
    2016, 20 (34):  5057-5063.  doi: 10.3969/j.issn.2095-4344.2016.34.007
    Abstract ( 410 )   PDF (4876KB) ( 249 )   Save

    BACKGROUND: To achieve excellent contraceptive effects, the copper wire on the copper-containing intrauterine device surface persistently releases copper ions, but ectopic intrauterine device, abnormal uterine bleeding, menostaxis and waist and abdominal pain are usually inevitable.
    OBJECTIVE: To investigate the correlation of abnormal uterine bleeding caused by copper/low-density polyethylene nanocomposite intrauterine device with copper ion concentration and expression of vascular endothelial growth factor in endometrial tissues.
    METHODS: Totally 60 female patients, aged from 25 to 40 years old, hospitalized for taking intrauterine devices were enrolled, and those patients were divided into abnormal uterine bleeding group (n=32) and non- bleeding group (n=28). In the meanwhile, another 20 women without intrauterine devices and with the normal menstrual cycle were selected as control group. Patients in the abnormal uterine bleeding group and non- bleeding group underwent the removal of intrauterine device and scraping endometrial tissues within 4-7 days after menstruation; patients in the control group underwent scraping endometrial tissues within 4-7 days after menstruation. The copper ion content in endometrial tissues was measured by atomic absorption method; expression of endometrial vascular endothelial growth factor detected by immunohistochemical staining and the microvessel density counted. Additionally, the corrosion ratio of copper ion in the simulated uterine fluid was detected using flame atomic absorption spectroscopy method.
    RESULTS AND CONCLUSION: The content and corrosion ratio of copper ion in the uterine abnormal bleeding group was significantly higher than those in the non-bleeding group (P < 0.05), and the copper ion content of no bleeding group was significantly higher than that of control group (P < 0.05). The amount of copper in the intrauterine device of abnormal uterine bleeding group was higher than that in non-bleeding group (P < 0.05). Compared with the control and non-bleeding groups, the vascular endothelial growth factor expression and microvessel density were significantly increased in the uterine abnormal bleeding group (P < 0.05); and the control group and non-bleeding group had no significant differences in the vascular endothelial growth factor expression and microvessel density. Furthermore, there was a positive correlation of the vascular endothelial growth factor expression with microvessel density and copper ion content. In conclusion, after implantation of copper/low-density polyethylene   nanocomposites intrauterine device, the higher copper ion concentration in endometrial tissues may lead to the over-expression of vascular endothelial growth factor that increases the endometrial microvessel density through a variety of ways, and promote microvessel expansion and congestion, finally resulting in abnormal uterine bleeding.

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    An artificial reticular chest wall made of biodegradable materials: properties and application in chest wall reconstruction
    Wang Xin, Tong Xiao-bing,Liu Chang-ming
    2016, 20 (34):  5064-5069.  doi: 10.3969/j.issn.2095-4344.2016.34.008
    Abstract ( 463 )   PDF (4126KB) ( 237 )   Save

    BACKGROUND: Due to their inability to be degraded, the traditional repair materials for chest wall defects require a long-term stay in the body. Therefore, severe tissue reaction and the high incidence of complications make the traditional materials unable to meet the requirements of restoration.
    OBJECTIVE: To prepare an artificial reticular chest wall using biodegradable materials, and to analyze its performance and application in the repair of chest wall defect.
    METHODS: Mixture of silk fiber and polycaprolactone was used to prepare the biodegradable chest wall, and its porosity and modulus of elasticity were measured. Twenty-two rabbits were selected to build chest wall defect models, which were randomized into two groups. The artificial reticular chest wall was implanted into experimental group, and polycaprolactone implanted into control group. At 4 weeks after implantation, the chest defect was observed by hematoxylin-eosin staining; at 2 months, the chest defect region was observed by CT examination.
    RESULTS AND CONCLUSION: The holes were uniformly distributed in the artificial chest wall, with the porosity of 54.4% and the diameter of 200-300 μm, fiber distribution in the material was relatively stable, and the modulus of elasticity was significantly higher than that of the polycaprolactone (P < 0.05). CT showed that in the experimental group, the implant material was in close contact with the rib ends, and new tissues appeared between the chest wall plate and visceral pleura; in the control group, the material contacted the broken ends with unclear border, and a visible high density. Hematoxylin-eosin staining showed that in the experimental group there were numerous fibroblasts and a small amount of inflammatory cells, and collagen fibers were loose; in the control group, the boundary between the muscle fiber membrane and the muscle became obscure, accompanied by appearance of edema and more inflammatory cells. These results show that the artificial reticular chest wall made of biodegradable materials can promote the chest wall repair.

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    Long-term effects of Enterprise self-expanding intracranial stent implantation in the treatment of carotid artery stenosis in patients with ischemic stroke: study protocol for a randomized controlled trial
    Ji Meng, Wang Wei, Hu Wen-li
    2016, 20 (34):  5070-5075.  doi: 10.3969/j.issn.2095-4344.2016.34.009
    Abstract ( 678 )   PDF (4393KB) ( 274 )   Save

    BACKGROUND: The Enterprise stent system is a closed-loop, recoverable self-expanding stent that is effective in the treatment of intracranial aneurysm. However, most studies on the treatment of intracranial aneurysm after ischemic stroke are case series or case reports.
    OBJECTIVE: To assess the efficacy of the Enterprise stent system for the treatment of carotid artery stenosis in patients with atherosclerotic ischemic stroke.
    METHODS: We will perform a single-center, double-blind, randomized parallel-controlled trial at the Department of Neurology, Beijing Chao-yang Hospital, Capital Medical University, China. A cohort of 100 patients with atherosclerotic ischemic stroke will be included after obtaining written informed consent from participants or their guardians, and then randomly allocated to undergo either Enterprise self-expanding intracranial stent implantation in combination with antiplatelet medication (stent implantation group, n= 50) or only antiplatelet medication (drug group, n= 50) for treatment of carotid artery stenosis. Four time points (0.5, 1, 2, and 3 years after stent implantation or antiplatelet medication) will be selected for outcome observation and evaluation. The primary outcome will be the National Institutes of Health Stroke Scale score, which is used to evaluate neurologic deficits. The secondary outcomes will be the Barthel index and carotid stenosis rate. The study protocol has been approved by the Ethics Committee of Beijing Chao-yang Hospital, Captical Medical University, China (approval number: GJCY16012) and will be performed in accordance with the guidelines of the Declaration of Helsinki, formulated by the World Medical Association. This trial was registered at ClinicalTrial.gov (NCT02802072).
    DISCUSSION: There is a lack of randomized controlled studies addressing the long-term effects of the Enterprise self-expanding intracranial stent system for carotid artery stenosis in patients with ischemic stroke. This study will investigate and further confirm the clinical significance of the Enterprise stent system in the treatment of carotid artery stenosis in patients with ischemic stroke.

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    Biocompatibility of a bioabsorbable material in the internal fixation of articular fractures
    Xie Yang-jiang, Chen En-tao, Wu Bo, Ao Jun
    2016, 20 (34):  5076-5081.  doi: 10.3969/j.issn.2095-4344.2016.34.010
    Abstract ( 418 )   PDF (4099KB) ( 638 )   Save

    BACKGROUND: In recent years, poly-L-lactic acid (PLLA)/polylactic acid copolymer (PLGA)/ hydroxyapatite (HAP) composite bioabsorbable material has achived desired effect in articular fractures.
    OBJECTIVE: To investigate the biocompatibility of PLLA/PLGA/HA bioabsorbable material in the internal fixation of articular fractures.
    METHODS: In vivo experiment: 22 New Zealand rabbits were enrolled to prepare ankle fracture models, and were then randomly divided into two groups, including composite material group fixed with PLLA/PLGA/HA bioabsorbable material, and metal material group fixed with metal stent. Therapeutic effects and complications were observed at 7 days after surgery. In vitro experiment: PLLA/PLGA/HA bioabsorbable material was co-cultured with MG-63 cells to observe the cell proliferation and adhesion.
    RESULTS AND CONCLUSION: In the in vitro experiment, nine rabbits healed well, and two rabbits appeared to have complications in the mental material group; rabbits in the composite material group healed well without any complications. In the in vitro experiment: fusiform-shaped cells all adhered to the composite stent after 1 day of incubation; the number of cells began to increase showing the strong growth ability, and in a tight and regular arrangement at 3 days after incubation; the cytotoxicity was grade 0 or 1 within 1-7 days of incubation. At 3 days of co-culture, fusiform or polygonal cells appeared on the composite material, and these interconnectde cells extended well, and moreover, the frizz parts on the cell surface grew into the composite material, displaying a good adherence. To conclude, as a new bioabsorbable material, PLLA/PLGA/HA exhibits a good biocompatibility.

     

     

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    Growth of human periodontal ligament cells on the poly-L-lactic acid hydroxyapatite
    Gao Yong-zhi, Yin Zhi-yuan
    2016, 20 (34):  5082-5088.  doi: 10.3969/j.issn.2095-4344.2016.34.011
    Abstract ( 380 )   PDF (1222KB) ( 255 )   Save

    BACKGROUND: In constructing tissue-engineered periodontium in vitto, the effective combination of seed cells with scaffold materials is the key to promote the quality of tissue-engineered periodontium, in which human periodontal ligament cells are commonly used.
    OBJECTIVE: To explore the growth of human periodontal ligament cells on the poly-L-lactic acid hydroxyapatite.
    METHODS: Human periodontal ligament cells were isolated and cultured in vitro, and passage 3 cells were chosen to be randomly divided into two groups: cells cultured alone as control group, and cultured with poly-L-lactic acid hydroxyapatite as experimental group. After 1, 2 and 3 days, alkaline phosphatase activity and expression of type III collagen in the two groups were detected, and the cell growth curve was depicted using MTT method.
    RESULTS AND CONCLUSION: By immunohistochemical staining, cultured cells were positive for vimentin and alkaline phosphatase staining and negative for anti-keratin staining, indicating that the cells were identified as human periodontal ligament cells. By MTT method, there was no significant difference in the absorbance value of two groups at different time points (P > 0.05). And after 1, 2 and 3-day co-culture, the alkaline phosphatase activity levels showed no significant difference between two groups (P > 0.05). Besides, no significant difference in the absorbance value of type III collagen was found in the two groups (P > 0.05). To conclude, the human periodontal ligament cells can grow and proliferate well on the poly-L-lactic acid hydroxyapatite scaffold with no cytotoxicity.

     

     

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    Nano-hydroxyapatite coated biphasic calcium phosphate for posterolateral lumbar fusion: combined magnetic field plays an auxiliary role
    Zhuo Xiang-long, Lv Hong-bin, Hu Jian-zhong, Li Bing, Liu Yong, Wu Zu-tong
    2016, 20 (34):  5089-5097.  doi: 10.3969/j.issn.2095-4344.2016.34.012
    Abstract ( 396 )   PDF (1686KB) ( 360 )   Save

    BACKGROUND: Autologous bone is considered the main material for spinal fusion, while synthetic materials overcome the shortcomings caused by the autologous bone (complications and limited source) and become the most promising bone graft substitute materials.
    OBJECTIVE: To investigate the effects of nano-hydroxyapatite (nano-HA) coating and combined magnetic field (CMF) on the biphasic calcium phosphate (BCP) transplantation for rabbit posterolateral lumbar fusion.
    METHODS: Forty-eight rabbits underwent bilateral intertransverse processes fusion at the level of L5-6, and were then randomly divided into six groups: rabbits in group G1 received autologous iliac bone graft and CMF treatment; group G2 was given nano-HA/BCP and CMF treatment; group G3 received BCP and CMF treatment; group G4 received autologous iliac bone graft and placebo; group G5 underwent nano-HA/BCP and placebo; group G6 received BCP and placebo. CMF treatment was performed 30 minutes each day for 8 consecutive weeks beginning at 1 week after surgery. These rabbits were euthanized at 9 weeks after surgery to evaluate spinal fusion effects through palpation, X-ray examination, CT examination, histological analysis (decalcified and undecalcified sections) and biomechanical assessment.
    RESULTS AND CONCLUSION: The palpation, X-ray and histological examinations showed that there was significant difference in the fusion rate between groups G2 and G6, the highest in the group G2, and the lowest in the group G6 (P < 0.05). The bone ingrowth rate in the group G2 was significantly higher than those in the groups G3, G4 and G6 (P < 0.05). The normalized optical density index of fusion mass and bending stiffness in the group G2 were significantly higher than those in the other groups (P < 0.05). CT and histological observations found that new bone trabecula grew into the biological scaffold, exhibiting osseointegration. Factorial analysis showed that CMF and nano-HA coating could significantly improve the spinal fusion rate, fusion score, bone ingrowth rate and bending stiffness (P < 0.05). In conclusion, CMF combined with nano-HA/BCP for rabbit posterolateral lumbar fusion can significantly ameliorate the fusion rate, which is analogous to the single autologous bone; therefore, it can be used as a new spinal fusion method.

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    Nano-realgar effect on A549 lung cancer cell proliferation, apoptosis and migration
    Wang Wei-wei, Wang De-guang, Wu Zheng-wei, Zhang Yong, Qian Ke-bao
    2016, 20 (34):  5098-5103.  doi: 10.3969/j.issn.2095-4344.2016.34.013
    Abstract ( 475 )   PDF (1105KB) ( 261 )   Save

    BACKGROUND: Studies have found that realgar has anti-tumor effect, but its effect on proliferation, apoptosis and migration of A549 lung cancer cells is rarely reported.
    OBJECTIVE: To study the effect of nano-realgar on A549 lung cancer cell proliferation, apoptosis and migration.
    METHODS: Cultured A549 lung cancer cells were seeded onto 6-well culture plates containing 100 mg/L nano-realgar (experimental group) or normal saline (control group). Cell growth was observed under microscope for 48 hours. Cell proliferation and apoptosis were detected using MTT assay (24, 48, 72 hours of culture) and flow cytometry (24 and 48 hours of culture), respectively. Integrin β1 and cadherin expression was detected using immunohistochemical method at 24 hours of culture.
    RESULTS AND CONCLUSION: (1) Cell growth. In the experimental group, shrunk cells that were round or oval-shaped were scattered, and cell number was reduced. In the control group, adherent cells characterized by big size, abundant cytoplasm and fusiform shape grew vigorously. Moreover, some cells were fused into pieces. (2) Cell proliferation. The absorbance values of cells were significantly lower in the experimental group than the control group at different time (P < 0.05), while the cell growth inhibition ratio was higher in the experimental group than the control group (P < 0.05). (3) Cell apoptosis. The end-stage apoptotic rate and total apoptotic rate of cells were both higher in the experimental group than the control group (P < 0.05). (4) Immunohistochemical detection. The A549 cell surface integrin β1 and cadherin positive densities were significantly lower in the experimental group than the control group (P < 0.05). Taken together, the nano-realgar can inhibit the proliferation, invasion and metastasis, and induce apoptosis in A549 cells.

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     Constructing injectable tissue-engineered cartilage using cytodex-3 microcarrier and alginate hydrogel
    Yin He-yong, Sun Zhen, Li Pan, Yu Xiao-ming, Xu Yi-chi, Sun Xun, Xiao Bo, Wang Yu, Wang Ai-yuan, Guo Quan-yi, Xu Wen-jing, Lu Shi-bi, Peng Jiang
    2016, 20 (34):  5104-5109.  doi: 10.3969/j.issn.2095-4344.2016.34.014
    Abstract ( 373 )   PDF (1186KB) ( 485 )   Save

    BACKGROUND: Alginate hydrogel and microcarrier both can be used as injectable scaffolds, but their shortcomings such as poor mechanical property and poor plasticity remain unresolved.
    OBJIECTIVE: To explore the feasibility of constructing an injectable tissue-engineered cartilage with cytodex-3 microcarrier/alginate hydrogel composite.
    METHODS: Injectable cytodex-3 microcarrier/alginate hydrogel composite scaffold and injectable alginate hydrogel scaffold were established, and the mechanical properties of the two scaffolds were detected. Chondrocytes-seeded cytodex-3 microcarrier was obtained after incubated in the bioreactor, and then composited with alginate hydrogel as experimental group; chondrocytes were co-cultured with alginate hydrogel as control group. Subsequently, cell viability and ability of DNA and glycosaminoglycan synthesis were detected.
    RESULTS AND CONCLUSION: The Young’s modulus of the experimental group was significantly higher than that of the control group (P < 0.05). And in the control group, chondrocytes were in a round shape and evenly distributed in the alginate hydrogel; in the experimental group, chondrocytes adhered on the scaffold surface and evenly distributed in the scaffold. After 1 day of culture, both viable and numerous dead chondrocytes could be found in both two scaffolds; and after 14-day culture, there were no dead chondrocytes in both two scaffolds, abundant proliferating chondrocytes maintained a high cell viability, and the number of chondrocytes in the experimental group was significantly higer than that of the control group. What’s more, the contents of DNA and glycosaminoglycans were in a rise with time in both two groups, which were significantly higher in the experimental group than the control group (P < 0.05). These results suggest that the cytodex-3 microcarrier/alginate hydrogel composite is a promising injectable scaffold in cartilage tissue engineering.

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    Rapamycin-eluting stent versus paclitaxel-eluting stent for coronary ostial lesions: effective and safety evaluation after 1-year follow-up
    Chen Xiao-long
    2016, 20 (34):  5110-5115.  doi: 10.3969/j.issn.2095-4344.2016.34.015
    Abstract ( 330 )   PDF (1121KB) ( 303 )   Save

    BACKGROUND: Rapamycin and paclitaxel eluting stents have been widely used in the treatment of coronary ostial lesions (left main coronary artery and right coronary artery ostial lesions). However, the comparative research on the effectiveness and safety of the two stents for coronary ostial lesions is relatively rare.
    OBJECTIVE: To explore the efficacy and safety of the rapamycin-eluting stent versus paclitaxel-eluting stent in the treatment of coronary ostial lesions.
    METHODS: 135 patients with coronary ostial lesions were selected and were allotted into two groups by random number table, 73 cases treated with rapamycin-eluting stent and the remaining 62 cases treated with paclitaxel-eluting stent. After 12-month follow-up, the incidence of adverse cardiac events, thrombosis, target lesion revascularization and stent-restenosis were compared between two groups.
    RESULTS AND CONCLUSION: Neither did stent drop off or displace, nor did other adverse reactions related to the stent occurr in both two groups. The incidence of cardiac adverse events in the rapamycin group and paclitaxel group was 8.5% and 6.8%; the rate of thrombosis was 3.9% and 4.1%; the rate of the target lesion revascularization was 4.1% and 6.4%; the rate of stent-restenosis was 7.5% and 9.2%, respectively. All above indicators showed no significant differences between two groups. In conclusion, the efficacy and safety of the rapamycin-eluting stent for coronary ostial lesions are equivalent to those of the paclitaxel-eluting stent.

     

     

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    Pelvic floor reconstruction using Gynemesh
    Yang Lan, Wang Juan, Xu Lan-lan, Wang Li-feng, Li Yan-fang
    2016, 20 (34):  5116-5121.  doi: 10.3969/j.issn.2095-4344.2016.34.016
    Abstract ( 352 )   PDF (1183KB) ( 291 )   Save

    BACKGROUND: Gynemesh is a polypropylene fabric woven by monofilament polypropylene shaped into a flat form, with a strong tensile strength, small foreign body reaction and good biocompatibility.
    OBJECTIVE: To investigate the effect of Gynemesh on pelvic floor reconstruction.
    METHODS: Gynemesh was prepared by the chemical reduction method in the liquid-phase, and observed histologically. Then its thickness, elongation at break, tensile strength, and elasticity modulus were detected. Eight female New Zealand rabbits were used to make pelvic floor dysfunction models by a vaginal balloon, and randomly assigned into experimental group (pelvic floor reconstruction using Gynemesh) or control group (vaginal wall repair and hysterectomy), respectively. Thirty days post surgery, the Pelvic Floor Impact Questionnaire (PFIQ-7) and Pelvic Floor Distress Inventory (PFDI-20) were detected and compared between two groups.
    RESULTS AND CONCLUSION: The Gynemesh had a thickness of (0.37±0.14) mm, an elongation at break of (25.35±2.68)%, a tensile strength of (7.69±1.17) MPa, and an elastic modulus of (0.007±0.008) GPa. Under the light microscope, a large amount of pink collagen fibers arranged neatly on the Gynemesh, but no blue nuclear material and residual cells existed. Under the scanning electron microscope, the fibers were tightly packed with no residual cells on the Gynemesh. At 30 days after surgery, the Gynemesh was not degraded and no erosion reaction occurred in the experimental group. Moreover, the experimental group had a lower incidence of complications compared with the control group (P < 0.05). These findings indicate that the Gynemesh has good biological performance and it is an ideal material for pelvic floor reconstruction.

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    Prolift mesh versus polypropylene mesh in the whole pelvic floor reconstruction
    Yang Xiao-hui, Zhao Zhi-ying
    2016, 20 (34):  5122-5128.  doi: 10.3969/j.issn.2095-4344.2016.34.017
    Abstract ( 636 )   PDF (1115KB) ( 267 )   Save

    BACKGROUND: A large number of studies focused on mesh application in the whole pelvic floor reconstructive surgery, but the comparative research on the Prolift mesh and polypropylene mesh (Gynemesh) in the whole pelvic floor reconstruction is rarely reported.
    OBJECTIVE: To compare the Prolift mesh with Gynemesh in the whole pelvic floor reconstructive surgery.
    METHODS: Totally 90 female patients with pelvic organ prolapse were enrolled, aged 40 to 80 years old, and were randomly divided into Prolift group and Gynemesh group, who were subjected to full pelvic floor reconstruction with Prolift mesh or Gynemesh, respectively. Afterwards, operation time, intraoperative blood loss, postoperative vaginal bleeding, hematoma, local paresthesia, urinary retention, overactive bladder, residual urine, postoperative incision infection, mesh exposure and postoperative quality of life were compared in two groups.
    RESULTS AND CONCLUSION: No hematoma, local paresthesia, urinary retention and rejection reactions appeared in both two groups. The operation time, intraoperative blood residual urine, length of stay, catheter retention time had no significant differences between two groups. In the Prolift group, one case had a small amount of vaginal bleeding, one case had overactive bladder, five cases had mesh exposure at the anterior wall of vaginal, and two cases had light stress urinary incontinence; in the Gynemesh group, no vaginal bleeding, overactive bladder and stress urinary incontinence occurred, but four cases had mesh exposure at the anterior wall of vaginal. Additionally, the scores on the quality of life in the two groups at the last follow-up were significantly lower than those before surgery (P < 0.05), but there was no significant difference between the two groups (P > 0.05). These results demonstrate that both Prolift system and Gynemesh are safe and effective for the whole pelvic floor reconstruction, resulting in few postoperative complications. Patients can quickly recover, and obtain satisfactory outcomes.

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    Platelet-fibrin scaffold for treatment of myocardial infarction
    Zhang Yan, Chen Yan, Li Qing-min, Meng Hua
    2016, 20 (34):  5129-5135.  doi: 10.3969/j.issn.2095-4344.2016.34.018
    Abstract ( 607 )   PDF (1129KB) ( 218 )   Save

    BACKGROUND: The development of biomaterials provides a new idea for myocardial infarction treatment, and so far there are numerous biomaterials, such as fibrin glue, matrigel, emulsion of extracellular matrix and alginate, for myocardial infarction. But there is a lack of studies about the platelet-fibrin scaffold for myocardial infarction.
    OBJECTIVE: To explore the effect of the platelet-fibrin scaffold on rat myocardial infarction.
    METHODS: Platelet-fibrin was used to prepare a platelet-fibrin scaffold, and 40 rat models of myocardial infarction were randomly divided into two groups: 200 μL platelet fibrins were injected into the tissues around the rat infarcted myocardium as platelet-fibrin scaffold group, and the same amount of DMEM was injected into the tissues around the rat infarcted myocardium as control group. Subsequently, expressions of vascular endothelial growth factor, hepatocyte growth factor and insulin-like growth factor 1 released from the scaffold were detected. Production of endothelial cells and cardiomyocytes, cardiomyocyte apoptosis, capillary density and cardiac function in rats after implantation were observed.
    RESULTS AND CONCLUSION: The platelet-fibrin scaffold was successfully prepared. The expression of vascular endothelial growth factor, hepatocyte growth factor and insulin-like growth factor 1 in the scaffold group was (115.7±19.45), (23.98±12.32) and (288.4±16.74) ng/L, respectively. The number of von Willebrand factor-positive cells and a-SA-positive cells in the platelet-fibrin scaffold group was significantly higher than that in the control group (P < 0.05). The number of TUNEL-positive cells in the platelet-fibrin scaffold group was significantly lower than that in the control group (P < 0.05). The capillary density and capillaries with blood flow in the platelet-fibrin scaffold group were significantly higher than those in the control group (P < 0.05). Both the left ventricular end-diastolic volume and left ventricular end-systolic volume in the platelet-fibrin scaffold group were significantly lower than those in the control group (P < 0.05). In conclusion, the platelet-fibrin scaffold can promote the generation of endothelial cells, cardiomyocytes and capillaries, and further improve heart function. Besides, the platelet-fibrin scaffold exerts protective effect on the heart probably by secreting cytokines.

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    Chitosan-gelatin sponge versus umbilical cord mesenchymal stem cellsfor skin wound healing
    Fang Shao-xia, Guo Fen
    2016, 20 (34):  5136-5141.  doi: 10.3969/j.issn.2095-4344.2016.34.019
    Abstract ( 385 )   PDF (938KB) ( 303 )   Save

    BACKGROUND: Umbilical cord mesenchymal stem cells possess multipotent differentiation and self-replication abilities, and can differentiate into osteoblasts, chondrocytes, smooth muscle cells and vascular endothelial cells, which contribute to reepithelialization and angiogenesis.
    OBJECTIVE: To compare effects of umbilical cord mesenchymal stem cells and chitosan-gelatin sponge in skin wound healing.
    METHODS: Thirty male Sprague-Dawley rats were equivalently randomized into model, chitosan-gelatin sponge and stem cell groups. 3×3 cm full-thickness skin defects were created on the rat dorsal area in each group, and 1 day later, model rats in each group were given intradermal injection of PBS, chitosan gel or umbilical cord mesenchymal stem cells, respectively, for successive 15 days.
    RESULTS AND CONCLUSION: Compared with the model group, the wound healing rate was higher, the epidermal thickness was decreased, and the collagen fiber area was larger in the chitosan-gelatin sponge and stem cell groups. Furthermore, the healing effect in the chitosan-gelatin sponge group was superior to that in the stem cell group. To conclude, both chitosan-gelatin sponge and umbilical cord mesenchymal stem cells, especially umbilical cord mesenchymal stem cells, can effectively repair skin defects.

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    Comparison of different materials for skull defect repair
    Zhang Hai-fang
    2016, 20 (34):  5142-5148.  doi: 10.3969/j.issn.2095-4344.2016.34.020
    Abstract ( 402 )   PDF (1267KB) ( 334 )   Save

    BACKGROUND: Currently, different methods materials used for craniocerebral injury and skull defect repair have their own clinical efficacy and adverse reactions.
    OBJECTIVE: To compare the clinical effects of autologous bone, allograft bone, porous tricalcium phosphate and titanium mesh for skull defects.
    METHODS: 200 patients with skull defects were selected, including 120 males and 80 females, aged from 18-76 years old, and then were allotted into four groups by random number table (n=50 per group), undergoing repair with autologous bone, allograft bone, porous tricalcium phosphate and titanium mesh, respectively. The postoperative complications were compared among groups, and osseous healing properties were observed through the follow-up.
    RESULTS AND CONCLUSION: The healing property of autologous bone, allograft bone and titanium mesh was significantly superior to that of porous tricalcium phosphate (P < 0.05), but there were no significant differences amorg the autologous bone, allograft bone and titanium mesh groups. In addition, the incidence of complications of autologous bone and titanium mesh goup was significantly less than that of porous tricalcium phosphate and allograft bone groups (P < 0.05), and comparison between the latter two groups showed no significant difference. In conclusion, autologous bone and titanium mesh for skull defect repair have good biocompatibility, and can promote bone healing.

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    Tissue-engineered vascular scaffold materials
    Pan Xing-na, Li Ya-xiong, Jiang Li-hong
    2016, 20 (34):  5149-5154.  doi: 10.3969/j.issn.2095-4344.2016.34.021
    Abstract ( 378 )   PDF (873KB) ( 498 )   Save

    BACKGROUND: Tissue-engineered vascular scaffold materials have been developed from pure natural materials to degradable composite materials and nano polymer materials, and the preparation method has also been developed from the manual technology to the rapid proto-typing technology.
    OBJECTIVE: To clarify the advantages and disadvantages, application and research hotspots of different tissue-engineered vascular scaffold materials, and to find a suitable scaffold material for clinical treatment.
    METHODS: The first author retrieved databases of PubMed, CNKI and CqVip for relevant articles about tissue-engineered vascular scaffolds published from 1985 to 2015. The key words were “tissue engineering, tissue engineered, blood vessel, vascular, scaffold” in English and Chinese, respectively. In accordance with the inclusion and exclusion criteria, 36 articles were reviewed.
    RESULTS AND CONCLUSION: Non-degradable materials are mainly used to construct large diameter  tissue-engineered blood vessels. Natural biomaterials have good biocompatibility, which can provide necessary signals for cells and promote cell attachment and retain cell differentiation ability. Degradable polymer composite materials have good biocompatibility, whose mechanical properties, degradation rate and microstructure can be controlled, and they can be mass-produced according to the design requirements. The composite materials inheriting the advantages of natural biomaterials and synthetic polymer materials have become the most ideal scaffold materials and will be a research focus in the future.

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    Different wound dressings in the treatment of diabetic foot ulcers
    Wang Bing-yang, Niu Guang-ming, Du Hua, Weng Li-xin
    2016, 20 (34):  5155-5162.  doi: 10.3969/j.issn.2095-4344.2016.34.022
    Abstract ( 518 )   PDF (954KB) ( 382 )   Save

    BACKGROUND: To date, various types of dressings have been proved to promote healing of diabetic foot ulcers.
    OBJECTIVE: To introduce the principle and application of various kinds of wound dressing as well as other adjuvant therapies for diabetic foot ulcers.
    METHODS: CNKI, PubMed, Medline and Foreign Medical Journal Full-Text Service were retrieved by computer for relevant literatures published from 2005 to 2015. The search terms were “diabetic foot ulcer, wound healing, dressing, treatment” in Chinese and English, respectively.
    RESULTS AND CONCLUSION: The most commonly used dressings for diabetic foot ulcers include gels, hydrogels, sponges, foam dressings, film dressings. Polymer materials with different components exhibit their unique chemical, physical and biological properties, such as natural polymer dressings (chitin, chitosan and its derivatives, fibroin, dextran), synthetic polymer dressings (polyvinyl alcohol, polyethylene glycol/polyethylene oxide, poly(α-ester)s, all of which can promote the healing of diabetic foot ulcers. Other therapies for diabetic foot ulcers include herbal therapy, becaplermin, and maggot therapy.

    中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

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    Porous tantalum rod implantation improves the hip joint function of patients with avascular necrosis of the femoral head after femoral neck fracture surgery: study protocol for a randomized controlled trial
    Zhang He-ling, Deng Ming-hao, Yang Jian-cheng
    2016, 20 (34):  5163-5168.  doi: 10.3969/j.issn.2095-4344.2016.34.023
    Abstract ( 318 )   PDF (1024KB) ( 331 )   Save

    BACKGROUND: After femoral neck fracture, avascular necrosis of the femoral head occurs because of insufficient blood supply to the femoral head, resulting in increased difficulty in treatment, and greatly influencing the recovery of hip joint function. Core decompression and bone grafting is a common treatment method of avascular necrosis of the femoral head. A porous tantalum rod is a bone trabecula-like metal implant that is used to support weight-bearing area of necrotic bone, prevent further collapse of the necrotic area, and thereby exhibits favorable effects in the early treatment of avascular necrosis of the femoral head. Few randomized controlled studies are reported on porous tantalum rod implantation for treatment of avascular necrosis of the femoral head after femoral neck fracture surgery.
    OBJECTIVE: To investigate whether porous tantalum rod implantation can improve the hip joint function of patients with avascular necrosis of the femoral head subjected to femoral neck fracture surgery.
    METHODS: This is a prospective, single-center, randomized, controlled, open trial, which will be performed in the Department of Orthopedic Trauma, Qinghai University Affiliated Hospital, China. A total of 100 patients with avascular necrosis of the femoral head subjected to femoral neck fracture surgery will be randomly assigned to undergo core decompression and porous tantalum rod implantation (experimental group, n=50) or only core decompression (control group, n=50). All patients will be followed up for 1 year. Primary outcome measure is the percentage of patients whose hip joint function is graded as excellent as per Harris scores 12 months after surgery in total patient number in each group, which will be used to evaluate the recovery of hip joint function. Secondary outcome measures include (1) the percentage of patients with excellent hip joint function 1 and 6 months after surgery in total patient number in each group; (2) Visual Analogue Scale spine score prior to and 1, 6 and 12 months after surgery, which will be used to evaluate the severity of pain; (3) the percentage of patients presenting with femoral head collapse, prosthesis loosening and peri-prosthesis infection 6 and 12 months after surgery, which will be used to evaluate the biocompatibility of biomaterial with host; and (4) incidence of complications 6 and 12 months after surgery, which will be used to evaluate the safety of porous tantalum rod implantation. This study protocol has been approved by the Medical Ethics Committee of Qinghai University Affiliated Hospital of China (approval number: QHY1016B) and will be performed in accordance with the guidelines of the Declaration of Helsinki, formulated by the World Medical Association. Signed informed consent regarding trial procedure and treatment will be obtained from each patient. 
    DISCUSSION: This study is powered to validate the biocompatibility and therapeutic effects of porous tantalum rods in the treatment of avascular necrosis of the femoral head after femoral neck fracture surgery, which hopes to provide a novel persuasive surgical treatment method for this disease.

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