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在200℃,0.1 mol/L的MgCl_2溶液中对纯钛进行了水热处理,以期改善其生物活性。采用多种分析手段对水热处理前后试样的形貌、润湿性能及表面化学成分进行了分析;采用模拟体液浸泡法评价了处理前后试样的体外骨传导性。水热处理在试样表面形成了纳米氧化钛颗粒,但并没有改变试样的微米尺度的形貌,经过水热处理的试样表现出了超亲水性。水热处理成功地将Mg元素复合至钛表面;在MgCl_2溶液中进行水热处理时,Mg元素主要以钛酸镁形式存在,而在pH为9.5的MgCl_2的溶液中进行水热处理时,Mg元素主要以Mg(OH)_2形式存在。在SBF中浸泡3 d后,水热处理试样表面可观察到羟基磷灰石球状晶簇,而未经处理的试样表面则未能发现沉积,此外,过高的Mg复合量抑制了羟基磷灰石的形核长大。结果表明,水热处理在保持种植体宏观形貌不受影响的前提下可作为种植体生产的最后工序以提高其骨结合性。
Pure titanium was hydrothermally treated in 0.1 mol / L MgCl 2 solution at 200 ℃ in order to improve its bioactivity. The morphology, wettability and surface chemical composition of the samples before and after hydrothermal treatment were analyzed by a variety of analytical methods. The in vitro osteoconductivity of the samples before and after treatment was evaluated by the simulated body fluid immersion method. Hydrothermal treatment formed nano titanium oxide particles on the surface of the sample, but did not change the micro-scale morphology of the sample. The hydrothermal treated samples showed superhydrophilicity. Hydrothermal treatment successfully composites Mg element into titanium surface. When hydrothermal treatment in MgCl 2 solution, Mg element is mainly in the form of magnesium titanate. When hydrothermal treatment is carried out in MgCl 2 solution with pH 9.5, Mg (OH) _2 form. After immersing for 3 days in SBF, the hydroxyapatite spherulites were observed on the surface of hydrothermally treated samples, while the deposition on the surface of untreated samples was not found. In addition, Graystone’s nucleus grew up. The results show that the hydrothermal treatment can be used as the final process of implant production to improve the osseointegration while maintaining the macroscopic morphology of implants.