用于牙科应用的微孔/大孔聚己内酯支架

Microporous/Macroporous Polycaprolactone Scaffolds for Dental Applications.

作者信息

Shabab Tara, Bas Onur, Dargaville Bronwin L, Ravichandran Akhilandeshwari, Tran Phong A, Hutmacher Dietmar W

机构信息

Faculty of Engineering, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4000, Australia.

Max Planck Queensland Centre, Brisbane, QLD 4000, Australia.

出版信息

Pharmaceutics. 2023 Apr 26;15(5):1340. doi: 10.3390/pharmaceutics15051340.

Abstract

This study leverages the advantages of two fabrication techniques, namely, melt-extrusion-based 3D printing and porogen leaching, to develop multiphasic scaffolds with controllable properties essential for scaffold-guided dental tissue regeneration. Polycaprolactone-salt composites are 3D-printed and salt microparticles within the scaffold struts are leached out, revealing a network of microporosity. Extensive characterization confirms that multiscale scaffolds are highly tuneable in terms of their mechanical properties, degradation kinetics, and surface morphology. It can be seen that the surface roughness of the polycaprolactone scaffolds (9.41 ± 3.01 µm) increases with porogen leaching and the use of larger porogens lead to higher roughness values, reaching 28.75 ± 7.48 µm. Multiscale scaffolds exhibit improved attachment and proliferation of 3T3 fibroblast cells as well as extracellular matrix production, compared with their single-scale counterparts (an approximate 1.5- to 2-fold increase in cellular viability and metabolic activity), suggesting that these structures could potentially lead to improved tissue regeneration due to their favourable and reproducible surface morphology. Finally, various scaffolds designed as a drug delivery device were explored by loading them with the antibiotic drug cefazolin. These studies show that by using a multiphasic scaffold design, a sustained drug release profile can be achieved. The combined results strongly support the further development of these scaffolds for dental tissue regeneration applications.

摘要

本研究利用两种制造技术的优势,即基于熔融挤出的3D打印和致孔剂浸出,来开发具有可控特性的多相支架,这些特性对于支架引导的牙组织再生至关重要。聚己内酯-盐复合材料通过3D打印成型,支架支柱内的盐微粒被浸出,形成微孔网络。广泛的表征证实,多尺度支架在机械性能、降解动力学和表面形态方面具有高度可调节性。可以看出,聚己内酯支架的表面粗糙度(9.41±3.01 µm)随着致孔剂浸出而增加,使用更大的致孔剂会导致更高的粗糙度值,达到28.75±7.48 µm。与单尺度支架相比,多尺度支架表现出3T3成纤维细胞更好的附着和增殖以及细胞外基质的产生(细胞活力和代谢活性增加约1.5至2倍),这表明这些结构因其良好且可重复的表面形态可能会改善组织再生。最后,通过在各种设计为药物递送装置的支架中加载抗生素药物头孢唑林进行了探索。这些研究表明,通过使用多相支架设计,可以实现药物的持续释放。综合结果有力地支持了这些支架在牙组织再生应用中的进一步开发。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/6d3b/10220766/a23f5cd088ab/pharmaceutics-15-01340-g001.jpg

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