Mechanical properties and in vitro evaluation of bioactivity and degradation of dexamethasone-releasing poly-D-L-lactide/nano-hydroxyapatite composite scaffolds

被引：21

作者：

Chen, Ling ^{[1
]}

Tang, Chak Yin ^{[1
]}

Tsui, Chi Pong ^{[1
]}

Chen, Da Zhu ^{[2
]}

机构：

[1] Hong Kong Polytech Univ, Dept Ind & Syst Engn, Kowloon, Hong Kong, Peoples R China

[2] Shenzhen Univ, Coll Mat Sci & Engn, Shenzhen, Guangdong, Peoples R China

来源：

JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS | 2013年 / 22卷

关键词：

PDLLA/nano-HAp composites; In vitro bioactivity; Mechanical properties; Biodegradation; Drug releasing; SIMULATED BODY-FLUIDS; DRUG-DELIVERY; 3-DIMENSIONAL SCAFFOLDS; BIOMIMETIC APATITE; TISSUE; NANOCOMPOSITES; PH; POLY(D; L-LACTIDE); NANOCRYSTALS; FABRICATION;

D O I：

10.1016/j.jmbbm.2013.03.008

中图分类号：

R318 [生物医学工程];

学科分类号：

100103 [病原生物学];

摘要：

The purpose of this study was to fabricate drug-release nano-composite scaffolds and perform in vitro evaluation of their mechanical properties, bioactivity, biodegradability and drug release behaviors. Porous drug-release poly-D-L-lactide (PDLLA) composite scaffolds filled with different amounts of nano-hydroxyapatite (nano-HAp) were prepared by a technique combining polymer coagulation, cold compression moulding, salt leaching and drug coating. Apatite detected on the scaffolds after exposure to a simulated body fluid showed improvement in bioactivity and the apatite formation ability through the addition of the nano-HAp content in the composites. Nano-HAp incorporation and apatite formation made a positive impact on the mechanical properties of the scaffolds; however, plasticization and degradation of PDLLA had a negative impact. The pH-compensation effect of the composite scaffolds can reduce the risk of chronic inflammation complications. The fabrication method in this study can produce scaffolds with controllable structure, appropriate mechanical properties and degradation rates for cancellous bone repair applications. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：41 / 50

页数：10

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