磷酸钙人工骨联合雷洛昔芬修复兔下颌骨缺损

背景：雷洛昔芬是第3代选择性雌激素受体调节剂,可减少骨量的丢失,增加骨组织中的矿物质含量,降低骨折风险。 目的：观察雷洛昔芬结合自固化磷酸钙人工骨修复兔下颌骨缺损的效果。 方法：在36只新西兰大白兔左侧下颌骨制作8 mm×4 mm×3 mm的缺损模型,随机分组,实验组12只植入自固化磷酸钙人工骨,并给予雷洛昔芬7.5 mg/(kg•d);药物组12只给予雷洛昔芬7.5 mg/(kg•d);人工骨组12只植入自固化磷酸钙人工骨。分别于治疗4,8,12周取下颌骨标本,免疫组织化学法观察骨形态发生蛋白2的表达,激光共聚焦显微镜观察转化生长因子β的表达。 结果与结论：实验组治疗后4,8周时的骨形态发生蛋白2免疫组织化学染色阳性细胞数明显高于药物组与人工骨组,治疗后12周时实验组骨改建基本完成,骨形态发生蛋白2免疫组织化学染色阳性细胞数目低于其他两组。实验组转化生长因子β免疫荧光染色表达为逐步升高,到第8周时达到峰值,而药物组和人工骨组的转化生长因子β免疫荧光表达从4-12周一直呈上升状态,趋近于最高峰。说明雷洛昔芬能够促进自固化磷酸钙人工骨在骨缺损过程中骨形态发生蛋白的早期表达及早期骨痂的形成,加快骨缺损修复。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;组织工程全文链接：     

α-磷酸三钙骨移植材料在骨科领域应用的研究与进展

BACKGROUND: As one of the important bone substitute materials in bone tissue engineering, α-tricalcium phosphate (α-TCP) has been widely applied and researched. OBJECTIVE: To introduce the newest research progress about α-TCP as a kind of bone substitute material, and to prospect its development. METHODS: The first author searched the relative literatures addressing α-TCP as a bone substitute material published from January 1965 to August 2015 in PubMed, FMJS, CNKI, Wanfang and CBM databases. The keywords were “alpha tricalcium phosphate, composite material, bone graft, bone substitution material” in English and Chinese, respectively. According to the inclusion and exclusion criteria, finally 42 articles were reviewed. RESULTS AND CONCLUSION: α-TCP is one of calcium phosphate compounds which has been extensively applied and researched. It holds good bioactivity, biocompatibility, biodegradability, biodegradation and osteoconductivity except osteoinduction. Therefore, combining α-TCP with inorganic or organic factors to establish the composite material cannot only overcome the shortage of α-TCP in physicochemical characteristics, but also provide a mixed material with better resilience that is easy for cells to adhere, shorten bone reconstruction time, and even can carry antibacterial drugs. All these improvements will markedly shorten the bone repair time and provide a new idea for future development of bone graft materials.     

高黏度骨水泥椎体成形治疗Kümmell病

BACKGROUND: Percutaneous vertebroplasty has been gradually used to treat Kümmell disease because of less trauma and quick pain relief, but there is still a high rate of bone cement leakage. OBJECTIVE: To investigate the clinical efficacy of percutaneous vertebroplasty with high-viscosity bone cement plus hyperextension position reset for treatment of Kümmell’s disease. METHODS: The clinical data of 17 patients with Kümmell’s disease were retrospectively analyzed, including 5 males and 12 females, aged 55-83 years, and all underwent percutaneous vertebroplasty with high-viscosity bone cement plus hyperextension position reset. The visual analog scale, Oswestry disability index score, vertebral body height and vertebral kyphosis angle were determined. The bone cement leakage, pulmonary embolism, adjacent vertebral fractures and other complications were recorded. RESULTS AND CONCLUSION: At the 12th month of follow-up, the visual analog scale scores, Oswestry disability index scores and vertebral kyphosis angle of patients were significantly lower than those before treatment  (P < 0.05), the vertebral body height was significantly higher than that before treatment (P < 0.05). After treatment, there were three cases of bone cement leakage, which had no special discomfort and neurological symptoms, and one case of new fractures. These results demonstrate that hyperextension position reset combined with percutaneous vertebroplasty with high-viscosity bone cement in treatment of Kümmell’s disease can effectively relieve back pain, improve function of the lower back, partially restore vertebral height and reduce kyphosis angle.      

可塑型生物活性骨修复材料的制备及性能表征

背景：国外研制的可注射性硫酸钙骨替代材料具有操作简便、生物相容性好、能够注射入骨缺损处、原位固化、适应骨缺损进行塑形等优点,但价格昂贵。 目的：研究以α-半水硫酸钙为主要成分可塑型骨修复材料的最佳制备参数,并对其性能进行研究和表征。 方法：使用汽热法制备粉末,将α-半水硫酸钙粉末与透明质酸钠固化液分别按液固比0.2,0.25,0.3,0.35,0.4 mL/g混合,制备可注射人工骨材料,检测其注射性能、凝固时间和抗压强度;根据检测结果选择最佳液固比0.3 mL/g,在α-半水硫酸钙粉末中分别加入质量分数为1%,2%,3%的二水硫酸钙粉末,制备可注射人工骨材料,检测其注射性能、凝固时间和抗压强度,同时检测可注射骨材料的生物安全性。将液固比为     0.3 mL/g并加入2%二水硫酸钙制备的可注射人工骨材料植入巴马小型猪胸骨缺损模型,植入后8,16,24周进行组织学观察。 结果与结论：α-半水硫酸钙粉末与透明质酸钠固化液液固比为0.3 mL/g,加入质量分数2%二水硫酸钙粉末制备的可注射人工骨材料,初凝时间为4.0-5.0 min,终凝时间为8.0-9.0 min,抗压强度(8.93±0.23) MPa,具备良好的注射性能,符合临床要求的凝固时间及作为非负重骨缺损修复要求的抗压强度,并具有良好的生物安全性。动物植入实验表明可注射人工骨材料通过自身降解,可为新生骨的爬行替代提供空间,具有一定的成骨活性。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     

β-磷酸三钙煅烧骨修复兔股骨远端骨缺损

背景：自体骨兼具骨引导和骨诱导特性而成为修复骨缺损的金标准,但其来源有限,促使研究人员去寻找各类骨移植替代物。 目的：观察β-磷酸三钙煅烧骨作为骨移植替代物修复兔股骨远端骨缺损的效果。 方法：制备直径5 mm,深12 mm的兔股骨远端骨缺损模型,实验侧骨缺损部位植入β-磷酸三钙煅烧骨试件,对照侧仅制造骨缺损模型,不植入任何材料。观察实验动物手术切口局部情况,并制备病理切片,观察材料植入后的骨长入情况。 结果与结论：骨缺损部位植入β-磷酸三钙煅烧骨试件后,实验动物的切口愈合良好,在术后4周可以观察到骨缺损周边开始形成新骨,并随着时间的延长新骨形成量逐渐增多,至术后12周时,材料中心部位也可见新骨长入,材料逐渐降解,而对照侧直至术后12周时骨缺损部位仍无新骨长入。结果显示β-磷酸三钙具备良好的成骨性能,是一种优良的骨移植替代物。     

纳米双相陶瓷人工骨的成骨及降解

背景：烧结后的纳米羟基磷灰石结晶度很高,在体内很难降解;纳米β-磷酸三钙的降解速度太快,不利于体内生物组织在材料上附着,不利于引导成骨。 目的：观察纳米羟基磷灰石/纳米β-磷酸三钙双相陶瓷人工骨的成骨及降解性能。 方法：将36只青紫蓝兔随机分为实验组、对照组及空白组,制作左侧挠骨缺损模型,实验组与对照组分别植入纳米羟基磷灰石/纳米β-磷酸三钙双相陶瓷人工骨、纳米羟基磷灰石人工骨,空白组不植入任何材料。术后4,8,12周观察成骨和材料降解情况。 结果与结论：①术后12周时X射线：实验组可见材料基本降解,连续性骨痂通过骨缺损部位。对照组材料未见明显降解,骨缺损处有骨痂修复。空白组骨缺损未见修复。②术后12周时组织学观察：实验组材料孔隙内以骨细胞和成骨细胞为主,有少量软骨细胞,出现散乱的骨松质,材料完全降解。对照组材料孔隙内以骨细胞为主,有少量成骨细胞和软骨细胞,材料未见明显降解。空白组可见纤维结缔组织及胶原纤维。③术后12周时扫描电镜观察：实验组材料降解,骨缺损部位被新生骨松质取代。对照组材料未见降解,骨缺损部位大都被新生骨松质取代。空白组无明显骨重建。表明纳米羟基磷灰石/纳米β-磷酸三钙双相陶瓷人工骨具有良好成骨能力及降解性能。     

可注射聚富马酸丙二醇酯/β-磷酸三钙骨水泥的体外生物活性及其降解性

BACKGROUND: Poly(propylene fumarate) (PPF) can crosslink at room temperature, and β-tricalcium phosphate (β-TCP) has good biocompatibility, but PPF/β-TCP composite bone cement has not yet been systematically studied. OBJECTIVE: To prepare PPF/β-TCP composite bone cement and to explore its in vitro bioactivity and degradability. METHODS: β-TCP and PPF were respectively synthesized by liquid-phase precipitation and a two-step method, and PPF/β-TCP composite bone cement was prepared through mixing PPF with β-TCP. The    in vitro bioactivity of PPF/β-TCP was compared with the commercial poly(methyl methacrylate) (PMMA) through the ability of forming hydroxyapatite after immersed in simulated body fluid for 7 days. The in vitro degradability of PPF/β-TCP was studied via investigating the transformation of pH values, water uptake and mass loss, compressive strength and morphology at each time point. RESULTS AND CONCLUSION: There were hydroxyapatites formed on the PPF/β-TCP material, but none on the commercial PMMA material. The pH values of the PPF/β-TCP were stable in PBS for 63 days, indicating its degradation is moderate; the mass loss was up to 13.5% after 84 days. Scanning electron microscope displayed the degraded PPF/β-TCP surface, and its compressive strength was decreased gradually, which good for the integrity and sustainability of mechanical properties during degradation. These results suggest that PPF/β-TCP bone cement holds mineralization and degradability in vitro.     

可吸收生物玻璃注射体在骨质疏松大鼠椎体内的支撑及诱导成骨机制

文章快速阅读：  文题释义：可吸收生物玻璃注射体：为生物玻璃与磷酸钙骨水泥的复合物,主要成分为SiO₂、CaO、P₂O₃和Na₂O,与人体骨类似,能够在材料界面与人体骨组织之间形成牢固化学键,增加连接强度,提高移植物与界面的稳定性,传导性优于磷酸钙骨水泥。骨质疏松症模型：目前临床中主要有7种动物模型：①绝经后骨质疏松症模型,通过手术或药物“去势法”,模拟人类绝经后雌激素缺乏而导致的骨质疏松,最符合人体骨质疏松的发病特点,为目前研究骨质疏松症模型应用最多的模型方法;②老年性骨质疏松症模型,是目前惟一一种能证明增龄性骨脆性骨折的理想模型;③老年男性骨质疏松症模型可通过将雄性大鼠去睾18周;④内分泌代谢性骨质疏松症模型,可将雌性Wistar大鼠制成糖尿病模型后进行去势手术;⑤营养缺乏性骨质疏松症模型,通过高蛋白低钙饮食可模拟膳食不平衡导致的骨质疏松;⑥药物性骨质疏松症模型,通过糖皮质激素、维甲酸导致骨质疏松;⑦失用性骨质疏松症模型,通过全身或局部制动方法来模拟临床中继发骨折或其他手术后不同程度的制动,而导致的骨质疏松。 背景：生物玻璃与磷酸钙骨水泥复合形成的可吸收生物玻璃注射体,能在材料界面与人体骨组织之间形成牢固化学键,提高移植物与界面的稳定性。 目的：观察可吸收生物玻璃注射体在骨质疏松大鼠模型椎体内的支撑及诱导成骨机制。 方法：切除30只雌性SD大鼠双侧卵巢,制备骨质疏松模型。造模成功后,随机分成3组,在L3-5椎体骨缺损处分别置入聚甲基丙烯酸甲酯、注射性磷酸钙骨水泥和可吸收生物玻璃注射体。置入后12周取置入节段椎体,进行生物力学、降解性能、Ca、P、碱性磷酸酶、骨密度、骨形态发生蛋白2和转化生长因子β水平检测,以及骨组织切片观察。  结果与结论：可吸收生物玻璃注射体组的降解性能、抗压强度、表面羟基磷灰石沉积量、骨密度显著高于其余两组(P < 0.05),骨小梁相对体积、厚度和数量显著大于其他两组(P < 0.05),血清Ca、碱性磷酸酶、骨形态发生蛋白2和转化生长因子β水平显著高于其他两组(P < 0.05),血清P水平低于其他两组(P < 0.05)。结果表明,可吸收生物玻璃注射体可增强骨质疏松椎体内支撑力,诱导成骨,可能与提高骨形态发生蛋白和转化生长因子β的表达有关。 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 ORCID: 0000-0003-3640-1589(郑红梅)     

钛合金与不锈钢内固定材料置入修复脊柱结核的生物相容性

背景：钛合金和不锈钢是两种较为常用的内固定植入材料,但两种材料的治疗效果和生物相容性存在一定的差异。 目的：分析钛合金和不锈钢内固定材料置入治疗脊柱结核的效果及生物相容性。 方法：纳入脊柱结核患者71例,其中男35例,女36例,年龄17-81岁,35例进行钛合金内固定材料置入治疗,36例进行不锈钢内固定材料置入治疗。随访12个月,分析两组脊柱后凸畸形角度变化、治疗效果、Frankel脊髓损伤分级及材料生物相容性。 结果与结论：两组治疗前的脊柱后凸畸形角度、Frankel脊髓损伤分级比较差异无显著性意义,两组治疗后末次随访的脊柱后凸畸形角度、Frankel脊髓损伤分级均较治疗前明显改善(P < 0.05),但两组间比较差异无显著性意义;钛合金内固定组治愈34例(97%),不锈钢内固定组治愈33例(92%),两组间治愈率比较差异无显著性意义。两种材料均具有良好的生物相容性,未发生感染等不良反应。表明在脊柱结核治疗过程中,置入钛合金或不锈钢内固定材料均能获得良好的效果,并具有良好的生物相容性。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     

转化生长因子β1对多孔钽/MG63成骨样细胞复合物细胞增殖及分泌功能的影响

BACKGROUND: Previous studies have demonstrated that the Chinese porous tantalum made in China has non-toxicity and good biocompatibility, which can promote osteogenesis.             

人脐血间充质干细胞与β-磷酸三钙的生物相容性

背景：体内实验显示,β-磷酸三钙多孔陶瓷是较为理想的骨组织工程支架材料,但由于体内植入实验受多种因素的影响,不能很好反映细胞的生长、增殖和表型变化。 目的：观察体外人脐血间充质干细胞与β-磷酸三钙多孔陶瓷的生物相容性。 方法：将培养的第6代人脐血间充质干细胞悬液滴注入β-磷酸三钙内部进行复合,然后将干细胞-支架材料复合物置入含体积分数为10%胎牛血清的α-MEM培养体系中培养,于培养第4,8,12天电镜下观察人脐血间充质干细胞在材料表面及内部生长情况,采用MTT测试法绘制细胞生长曲线,并进行DNA含量、蛋白质含量测定。 结果与结论：人脐血间充质干细胞与β-磷酸三钙体外复合后能够在β-磷酸三钙支架材料表面及内部的孔隙内贴附,且生长良好,其DNA复制和蛋白合成功能不受β-磷酸三钙的影响。说明人脐血间充质干细胞和β-磷酸三钙支架材料生物相容性良好,二者可作为种子细胞和支架材料用于组织工程化骨与软骨的构建。     

MC3T3-E1细胞与多组分纳米羟基磷灰石基三维复合支架材料的相容性

目的 观察MC3T3-E1细胞在复合支架材料上的黏附、增殖及形态,评价多组分纳米羟基磷灰石基三维复合支架材料的生物相容性.方法 采用仿生学方法,将壳聚糖、羟基磷灰石、明胶、果胶按照一定比例制作成多组分纳米羟基磷灰石基三维复合支架材料.在复合支架材料上接种MC3T3-E1细胞,通过倒置相差显微镜、HE染色、扫描电镜、四甲...     

骨形态发生蛋白2诱导C2C12和MC3T3-E1的成骨分化与自噬

背景：一系列研究表明自噬与分化有密切联系;骨形态发生蛋白2是诱导C2C12、MC3T3-E1成骨分化经典途径,是研究成骨分化过程的理想模型。 目的：观察自噬与骨形态发生蛋白2诱导细胞株C2C12、MC3T3-E1成骨分化的关系。 方法：Real-Time PCR检测MC3T3-E1与C2C12在骨形态发生蛋白2(100 μg/L)诱导培养3 d后成骨与自噬相关指标变化。碱性磷酸酶染色检测不同浓度3-甲基腺嘌呤(0,1,5,10 mmol/L)对骨形态发生蛋白2(100 μg/L)诱导培养7 d MC3T3-E1与C2C12成骨指标碱性磷酸酶变化,Western Blot检测C2C12和MC3T3-E1在骨形态发生蛋白2(100 μg/L)诱导不同时间点(0,12,24,48,72,96 h)LC3-Ⅰ/Ⅱ蛋白表达水平。 结果与结论：在骨形态发生蛋白2诱导细胞株C2C12、MC3T3-E1成骨分化过程中,诱导自噬相关mRNA与蛋白水平均有增高趋势,且自噬相关蛋白LC3水平增高与时间相关。同时,抑制自噬成骨分化过程中碱性磷酸酶表达水平降低。因此,自噬与骨形态发生蛋白2诱导细胞株C2C12、MC3T3-E1成骨分化过程有密切关系。 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程全文链接：     

The precision structural regulation of PLLA porous scaffold and its influence on the proliferation and differentiation of MC3T3-E1 cells

A thermal-induced phase separation combined sugar template method was used to fabricate the Poly (L-lactide) acid (PLLA) scaffolds with precisely regulated porous structure. The effect of tuned porous structure of scaffolds on osteoblasts proliferation and differentiation was investigated. The results showed that the pore diameters (200–300, 300–400, 400–500 μm), porosity and interconnectivity of PLLA scaffolds can be accurately controlled indicated by scanning electron microscope. The results of cell experiments showed that the porous structure including the pore size and interconnectivity of scaffolds dramatically influence the cell proliferation and differentiation. The scaffold with pore diameter of 400–500 μm exhibited the highest cell viability and alkaline phosphatase activity among all the scaffolds for the MC3T3-E1 cells. The higher cell proliferation and biocompatibility observed in the 400–500 μm scaffold indicated the high selectivity for MC3T3-E1cells on the pore size of scaffold in tissue engineering. The precise control of the porous structure of scaffold may better guide the cell–matrix interaction in the future research.     

Demineralized dentin matrix composite collagen material for bone tissue regeneration

Demineralized dentin matrix (DDM) had been successfully used in clinics as bone repair biomaterial for many years. However, particle morphology of DDM limited it further applications. In this study, DDM and collagen were prepared to DDM composite collagen material. The surface morphology of the material was studied by scanning electron microscope (SEM). MC3T3-E1 cells responses in vitro and tissue responses in vivo by implantation of DDM composite collagen material in bone defect of rabbits were also investigated. SEM analysis showed that DDM composite collagen material evenly distributed and formed a porous scaffold. Cell culture and animal models results indicated that DDM composite collagen material was biocompatible and could support cell proliferation and differentiation. Histological evaluation showed that DDM composite collagen material exhibited good biocompatibility, biodegradability and osteoconductivity with host bone in vivo. The results suggested that DDM composite collagen material might have a significant clinical advantage and potential to be applied in bone and orthopedic surgery.     

Accelerated mineralization of dense collagen-nano bioactive glass hybrid gels increases scaffold stiffness and regulates osteoblastic function

Plastically compressed dense collagen (DC) gels mimic the microstructural, mechanical, and biological properties of native osteoid. This study investigated the effect of hybridizing DC with osteoinductive nano-sized bioactive glass (nBG) particles in order to potentially produce readily implantable, and mineralizable, cell seeded hydrogel scaffolds for bone tissue engineering. Due to the high surface area of nBG and increased reactivity, calcium phosphate formation was immediately detected within as processed DC-nGB hybrid gel scaffolds. By day 3 in simulated body fluid, accelerated mineralization was confirmed through the homogeneous growth of carbonated hydroxylapatite on the nanofibrillar collagen framework. At day 7, there was a 13 fold increase in the hybrid gel scaffold compressive modulus. MC3T3-E1 pre-osteoblasts, three-dimensionally seeded at the point of nanocomposite self-assembly, were viable up to day 28 in culture. In the absence of osteogenic supplements, MC3T3-E1 metabolic activity and alkaline phosphatase production were affected by the presence of nBG, indicating accelerated osteogenic differentiation. Additionally, no cell-induced contraction of DC-nBG gel scaffolds was detected. The accelerated mineralization of rapidly produced DC-nBG hybrid gels indicates their potential suitability as osteoinductive cell delivery scaffolds for bone regenerative therapy.     

牵张应力介导细胞成骨分化及相关基因的表达

背景：ERK1/2信号通路和核因子κB信号通路是否参与了牵张应力作用下MC3T3-E1细胞成骨分化及相关基因表达的调控,尚不清楚。 目的：观察机械牵张应力对作用下ERK1/2和核因子κB通路对成骨细胞碱性磷酸酶、Ⅰ型胶原、骨钙蛋白、白细胞介素6表达的影响,探讨ERK1/2与核因子κB信号通路对成骨细胞分化的调控作用。 方法：体外培养的MC3T3-E1细胞,以ERK1/2通路特异性抑制剂PD098059及核因子κB通路抑制剂PDTC分别处理30 min后加载12%的拉伸应变率24 h,以正常细胞及单纯加载12%牵张应力24 h为对照。采用ELISA及Real-time PCR方法检测细胞加载前后碱性磷酸酶活性、Ⅰ型胶原、骨钙蛋白及白细胞介素6 mRNA的表达。 结果与结论：在12%牵张应力作用下,MC3T3-E1细胞碱性磷酸酶、Ⅰ型胶原、白细胞介素6的表达受ERK1/2信号通路的调控,而骨钙蛋白基因表达的变化不受ERK1/2通路的影响。核因子κB信号通路抑制剂PDTC可显著抑制机械牵应张力作用下MC3T3-E1细胞碱性磷酸酶活性的降低,同时抑制白细胞介素6基因的表达,而Ⅰ型胶原、骨钙蛋白基因表达的变化不受核因子κB信号通路的影响。结果表明牵张应力可以通过ERK1/2和核因子κB通路影响MC3T3-E1细胞的成骨分化及相关基因表达。 中国组织工程研究杂志出版内容重点：组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松;组织工程全文链接：     

新型氯化锂复合磷酸钙骨水泥的理化性能及成骨特性

BACKGROUND: Lithium chloride is a widely used inorganic ion inhibitor of glycogen synthase kinase-3β, and it can be combined with glycogen synthase kinase-3β to activate the classical Wnt/β-catenin pathway, thereby promoting human bone marrow mesenchymal stem cells and osteoblasts proliferation and accelerating bone repair. OBJECTIVE: To observe the physicochemical properties of novel lithium chloride/calcium phosphate cement, and to explore its osteoinductive biological property. METHODS: Calcium phosphate cement served as control group, and lithium chloride/calcium phosphate cement containing different lithium content as experimental groups. The setting time and compressive strength of bone cement in each group were detected, and the microstructure of the material surface observed under scanning electron microscopy. Bone cement and MC3T3-E1 cells were co-cultured in vitro, and the growth and adhesion morphology of MC3T3-E1 cells on the surface of bone cement were observed under the scanning electron microscope. Effect of bone cement extracts on cell proliferation was determined through MTT assay, and alkaline phosphatase kit used for determining alkaline phosphatase activity. RESULTS AND CONCLUSION: Lithium chloride/calcium phosphate cement had the same physicochemical properties to the calcium phosphate cement. Initial and final setting time, compressive strength and morphology of bone cement had no significant differences among groups. MC3T3-E1 cells grew and adhered well on the material surface. Results of MTT assay showed that compared with the calcium phosphate cement, the lithium chloride/calcium phosphate cement was better to improve osteoblast proliferation in vitro. In addition, the alkaline phosphatase activity in MC3T3-E1 cells was higher in experimental groups than the control group. These findings indicate that lithium chloride/calcium phosphate cement can maintain good physicochemical properties, and release lithium ions to promote bone formation.       

钛表面微弧氧化涂层的细胞生物活性

背景：微弧氧化技术可改善钛或钛合金的表面特征。 目的：研究纯钛表面微弧氧化涂层的表面性能及其对MC3T3-E1细胞早期黏附、增殖及成骨能力的影响。 方法：将46个直径10 mm、厚度2 mm圆盘状纯钛试件分为实验组和对照组。实验组置于含0.02 mol/Lβ-甘油磷酸二钠盐及0.2 mol/L乙酸钙的电解液中进行微弧氧化处理,对照组对试件进行机械抛光。扫描电子显微镜观察试件表面形貌,X射线能谱分析检测涂层表面钙磷比,X射线衍射分析检测涂层晶相构成。将MC3T3-E1细胞接种在两组试件表面,1,2,4 h电镜下观察细胞形态,在2,4,7 d通过CCK-8方法检测细胞增殖,并于7,14 d检测碱性磷酸酶活性。 结果与结论：经微弧氧化处理后,钛表面形成粗糙多孔的钙磷涂层,微弧氧化涂层主要元素为Ca、P、O及Ti,微弧氧化膜层主要由氧化钛、钛酸钙、磷酸钙及偏磷酸钙构成。电镜观察显示1 h 微弧氧化涂层表面细胞已伸出伪足,4 h呈现较典型的细胞形态。细胞在微弧氧化处理钛表面4,7 d的细胞增殖和7,14 d的碱性磷酸酶活性高于对照组。表明微弧氧化技术生成的粗糙多孔钙磷涂层能显著促进MC3T3-E1细胞的早期黏附、增殖及成骨活性。