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首页> 外文期刊>Journal of biomedical materials research. Part B, Applied biomaterials. >Resorbable defect analog PLGA scaffolds using CO_2 as solvent: Structural characterization
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Resorbable defect analog PLGA scaffolds using CO_2 as solvent: Structural characterization

机译:使用CO_2作为溶剂的可吸收缺陷类似物PLGA支架:结构表征

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After tooth extraction, the immediate wound treatment by implanting an exact copy of the root could prevent alveolar bone atrophy. The implant should have an interconnected porosity in order to promote tissue ingrowth. This communication reports a novel method to realize such net-shaped porous scaffolds fabricated within a few minutes. Porosity and micro-architecture are evaluated by Hg-porosimetry and by image analysis of electron and light microscopy as well as by computed micro-tomography. The total porosity of the scaffold corresponds to (63+-3) percent, mainly related to open interconnected porosity. Micro-tomography, as a noninvasive 3D method, is best suited to uncover pores of about 100 mu m, a diameter especially important for tissue in-growth. The differentiation between open and closed porosity, however, depends on the method chosen. This effect is attributed to the spherical pores with an orifice only detected in the 3D analysis. Consequently, the closed porosity is overestimated by 8 percent evaluating 2D images. Finally, the mean pore diameter is found to be 106 and 100 mu m for 2D and 3D analysis, respectively. Although the porosity of the scaffold needs to be further optimized for clinical applications, the procedure proposed is a promising route in manufacturing open porous implants without the use of any organic solvent.
机译:拔牙后,通过植入确切的根部进行即时伤口治疗可以防止牙槽骨萎缩。植入物应具有相互连通的孔隙率,以促进组织向内生长。该交流报道了一种新颖的方法,可以在几分钟内实现制成这种网状多孔支架的目的。孔隙率和微结构可通过汞孔率法,电子和光学显微镜的图像分析以及计算机断层扫描技术进行评估。支架的总孔隙率相当于(63 + -3)%,主要与开放的互连孔隙率有关。显微断层扫描作为一种非侵入式3D方法,最适合发现大约100微米的孔,该直径对于组织向内生长特别重要。但是,开孔和闭孔的区别取决于所选择的方法。该效应归因于球形孔,孔只有在3D分析中才能检测到。因此,通过评估2D图像,8%的孔隙率被高估了。最后,对于2D和3D分析,平均孔径分别为106和100μm。尽管需要为临床应用进一步优化支架的孔隙率,但所提出的程序是在不使用任何有机溶剂的情况下制造开放式多孔植入物的有希望的途径。

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