Department of Applied Science and Technology, Politecnico di Torino, Torino, Italy.
CNR-ISMAC, Istituto per lo Studio delle Macromolecole, Biella, Italy.
Mater Sci Eng C Mater Biol Appl. 2017 Jul 1;76:1-12. doi: 10.1016/j.msec.2017.02.152. Epub 2017 Feb 28.
Periimplantitis and epithelial downgrowth are nowadays the main conditions associated to transmucosal dental implants. Gingival fibroblasts can play an important role in periimplantitis because they are the promoters of the inflammatory process and eventual tissue homeostasis and destruction. Moreover, the related inflammatory state is commonly driven also to counteract bacteria implants colonization. In the present research, a new technology based on mechanically produced nanogrooves (0.1-0.2μm) and keratin nanofibers deposited by electrospinning has been proposed in order to obtain titanium surfaces able to drive gingival fibroblasts alignment and proliferation without increasing bacterial adhesion. The prepared surfaces have been characterized for their morphology (FESEM), chemical composition (FTIR, XPS), surface charge (zeta potential) and wettability (contact angle). Afterwards, their performances in terms of cells (human primary gingival fibroblasts) and bacteria (Staphylococcus aureus) adhesion were compared to mirror-like polished titanium surfaces. Results revealed that gingival fibroblasts viability was not negatively affected by the applied surface roughness or by keratin nanofibers. On the opposite, cells adhesion and spread were strongly influenced by surface roughness revealing a significant cell orientation along the produced nanogrooves. However, the keratin influence was clearly predominant with respect to surface topography, thus leading to increased cells proliferation on the surfaces with nanofibers, disregarding the presence of the surfaces grooves. Moreover, nor nanogrooves nor keratin nanofibers increase bacterial biofilm adhesion in comparison with mirror polished surfaces. Thus, the present research represents a promising innovative strategy and technology for a surface modification finalized to match the main requirements for transmucosal dental implants.
如今,种植体周围炎和上皮下结缔组织内陷是与穿黏膜牙科种植体相关的主要病症。牙龈成纤维细胞在种植体周围炎中起着重要作用,因为它们是炎症过程的启动者,最终会导致组织的动态平衡和破坏。此外,相关的炎症状态通常也会促使机体对抗植入细菌的定植。在本研究中,提出了一种基于机械产生的纳米槽(0.1-0.2μm)和静电纺丝沉积的角蛋白纳米纤维的新技术,以获得能够驱动牙龈成纤维细胞排列和增殖而不增加细菌黏附的钛表面。对制备的表面进行了形貌(FESEM)、化学组成(FTIR、XPS)、表面电荷(zeta 电位)和润湿性(接触角)的特性研究。随后,将其在细胞(人原代牙龈成纤维细胞)和细菌(金黄色葡萄球菌)黏附方面的性能与镜面抛光钛表面进行了比较。结果表明,应用表面粗糙度或角蛋白纳米纤维不会对牙龈成纤维细胞的活力产生负面影响。相反,细胞黏附和扩展受到表面粗糙度的强烈影响,表明细胞沿着产生的纳米槽显著排列。然而,角蛋白的影响明显优于表面形貌,从而导致表面具有纳米纤维时细胞增殖增加,而忽略了表面槽的存在。此外,与镜面抛光表面相比,纳米槽和角蛋白纳米纤维都不会增加细菌生物膜的黏附。因此,本研究代表了一种有前途的创新策略和技术,用于表面改性,以满足穿黏膜牙科种植体的主要要求。