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首页> 外文期刊>Journal of biomedical materials research, Part A >Nucleation and growth of apatite on an anatase layer irradiated with UV light under different environmental conditions.
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Nucleation and growth of apatite on an anatase layer irradiated with UV light under different environmental conditions.

机译：在不同环境条件下，用紫外线照射的锐钛矿层上磷灰石的形核和生长。

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摘要

Implant surfaces must sometimes be modified to form strong bonds to host tissues. The method of depositing an anatase layer on chemically pure titanium by chemical oxidation with H(2)O(2) and subsequent calcination (CHT) is known to deposit apatite under physiological conditions; it thus exhibits bone-bonding ability. UV irradiation should affect the bonding ability because the CHT anatase layer would experience certain chemical modifications, such as a decrease or an increase in the number of Ti-OH and Ti-O(H)-Ti sites; these sites are considered active sites for apatite nucleation. When in vitro apatite deposition was examined, using Kokubo's simulated body fluid, UV irradiation in air reduced the apatite-forming ability of the CHT anatase layer, and UV irradiation on the samples in water enhanced the ability. These results were correlated to changes in the Ti-OH and Ti-O(H)-Ti sites, as determined by O 1s X-ray photoelectron spectroscopy. Analysis of the number and size of the semi-spherical apatite particles and their surface coverage led to a model: proper assembly of the Ti-OH and Ti-O(H)-Ti sites should only give rise to the induction of apatite nucleation, analogous to topotaxy effects.
机译：有时必须修改植入物表面以形成与宿主组织的牢固结合。已知通过用H（2）O（2）进行化学氧化并随后进行煅烧（CHT）在化学纯钛上沉积锐钛矿层的方法是在生理条件下沉积磷灰石。因此，它表现出骨粘合能力。紫外线辐射会影响键合能力，因为CHT锐钛矿层会经历某些化学修饰，例如Ti-OH和Ti-O（H）-Ti位置数量的减少或增加;这些位点被认为是磷灰石成核的活性位点。使用小久保的模拟体液检查体外磷灰石沉积时，在空气中进行紫外线照射会降低CHT锐钛矿层的磷灰石形成能力，而在水中的样品上进行紫外线照射则会增强这种能力。这些结果与通过O 1s X射线光电子能谱法测定的Ti-OH和Ti-O（H）-Ti位点的变化有关。通过分析半球形磷灰石颗粒的数量和大小及其表面覆盖率，得出了一个模型：正确组装Ti-OH和Ti-O（H）-Ti位点只会引起磷灰石成核，类似于拓朴效应。

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