Titanium and its alloys have been widely used in the manufacture of endosseous implants due to excellent biocompatibility, low\nelastic modulus, and good chemical stability. However, the titanium based metals are essentially bioinert materials. In order to\nimprove their bioactivity, biological coatings are usually applied. Recent studies found that, compared with hydroxyapatite coating,\ndicalcium phosphate anhydrous (DCPA, Monetite) coating maybe more bioactive due to higher solubility and release of Ca and P\nions. In this work, DCPA coating was prepared through a novel and simple method. Briefly, high concentration DCPA solution was\nsprayed onto superhydrophilic titanium and the specimens were dried fast in an air-circulating oven. After repeating the process\nover 100 times, a compact coating was fabricated. The microstructure, chemical composition, wettability, and in vitro bioactivity of\nthe coating were analyzed and evaluated. Results showed that the coating fully covered the substrate and consisted of a large number\nof uniformly sized DCPA granules that packed together closely. The coating showed good wettability and could keep the property\nfor a long time. After immersion in simulated body fluid for 2 weeks, a large amount of bone-like apatite with low crystallinity was\ninduced implying a good bioactivity.
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