The current research is devoted to assessing the bioactivity of different surface-treated Ti–6Al–7Nb samples by assessing the formation of calcium phosphate compounds. Three surface modification processes were performed, followed by dynamic immersion in Hanks’ solution for 32 days at the body temperature. The first set of samples was treated by oxidation at 400, 500 and 600 °C for 1 and 2 h to study the optimum oxidation condition. The second group was alkaline-treated using different concentrations of NaOH and aged at 400 and 600 °C. The third group was treated by a strong acidic solution (H₂SO₄ and HCl) for 0.5–1.5 h and then aged at 400 and 600 °C. Growth of calcium phosphate compounds (CPC) was generally enhanced with the formation of NaCl dendritic network, as it worked as an adhesive layer. Formation of the oxide layer enhanced the affinity to precipitate CPC, and the optimum oxidation condition was 500 °C for 1 h; higher temperatures and/or longer periods tended to dissolve back the built-up regions. Alkaline treatment prior to aging resulted in the formation of uneven build-up of CPC. Increasing the aging temperature at constant concentration encouraged the formation of dendritic structure (NaCl) and increased the width of the branches resulting in increased precipitation of CPC. Alkaline treatment and aging for 1 h using 2 M solution at 400 °C was the best condition to grow dense flower-shaped precipitates of CPC. However, increasing the aging temperature to 600 °C using the same solution resulted in the formation of TiO₂ which created more sites for CPC growth, and hence more homogenously distributed particles with less concentration were obtained. In case of the acidic treatment, increasing the immersion time in the acidic solution beyond 1 h dissolved back NaCl built-up regions and thus decreased the surface ability to grow CPC. A palette of colors was obtained on the samples’ surfaces after the different treatments, which was beneficial in improving the esthetics of implant components and implant prosthesis substructures.

当前的研究致力于通过评估磷酸钙化合物的形成来评估不同表面处理的Ti-6Al-7Nb样品的生物活性。进行了三个表面改性处理，然后在人体温度下动态浸入Hanks溶液中32天。第一组样品在400、500和600°C氧化处理1和2 h，以研究最佳氧化条件。第二组使用不同浓度的NaOH进行碱处理，并分别在400和600°C下老化。第三组用强酸溶液（H ₂ SO ₄和HCl）0.5-1.5小时，然后在400和600°C下老化。磷酸钙化合物（CPC）的生长通常随着NaCl树突状网络的形成而增强，因为它起着粘合层的作用。氧化层的形成增强了沉淀CPC的亲和力，最佳氧化条件为500°C 1 h。较高的温度和/或较长的时间往往会溶解积聚的区域。在老化之前进行碱性处理会导致CPC的不均匀堆积。在恒定浓度下提高时效温度会促进树枝状结构（NaCl）的形成，并增加分支的宽度，从而导致CPC沉淀增加。碱性处理和在400°C下使用2 M溶液老化1 h是生长密集的花状CPC的最佳条件。然而，_由图2可见，其产生了更多的CPC生长位点，因此获得了浓度更均匀，分布更均匀的颗粒。在进行酸处理的情况下，增加在酸溶液中的浸入时间超过1小时会溶解回NaCl堆积区域，从而降低了表面生长CPC的能力。经过不同处理后，在样品表面获得了调色板，这对改善植入物组件和植入物假体子结构的美学效果是有益的。