Biomedical subjects

Hwei Ling Khor

Publications and source records attributed to Hwei Ling Khor.

3 recordsLinked to original sources

PubMed2005

Osteogenic differentiation of mesenchymal progenitor cells in computer designed fibrin-polymer-ceramic scaffolds manufactured by fused deposition modeling.

Biomimetic scaffolds offer great potentials in the development of bone analogs for tissue engineering. The studies presented in this paper focus specifically on the osteogenic potential of the novel PCL/CaP matrices and its degradation behavior. Biodegradable Polymer-ceramic Scaffolds were fabricated using the solid free form fabrication technology: Fused Deposition Modeling (FDM). The scaffold architecture was characterized by a honeycomb-like design and a complete interconnectivity of the pores. Human mesenchymal stem cells (MSCs) were seeded together with fibrin glue into PCL/CaP scaffolds and cultured in vitro for periods of up to eight weeks. Cellular adhesion, proliferation and osteogenic differentiation were assessed in these constructs using a range of histological and microscopic techniques. In additional experiments, degradation was assessed by measuring mass loss, diameter change, molecular weight change and by scanning electron micrographs. MSCs were able to adhere, migrate, and differentiate along the osteogenic lineage with in these scaffolds. The PCL/CaP scaffolds showed up to 27 fold increased degradation of compared to PCL scaffolds.

Biodegradation, Environmental↗

PubMed2003

Preliminary study of a polycaprolactone membrane utilized as epidermal substrate.

Solvent-cast sheets of polycaprolactone were biaxially stretched to produce 10-15 microm thick films. PCL films were found to have a tensile strength of 55 MPa which is about two and a half times stronger than native skin. One of our previous studies using non-coated PCL membranes showed that only 36% of the membrane surface was covered with keratinocytes after 9 days of culture. The present study examined the effects of coating the surface of PCL membranes with fibrin on the proliferation of keratinocytes. Qualitative analysis revealed that the cells attached and proliferated better on coated PCL films. Keratinocytes exhibited healthy cobblestone morphology and proliferated as continuous monolayers over a period of 16 days. The results indicated that fibrin coated PCL films would support the attachment and proliferation of human keratinocytes and have the potential to be applied as a matrix material for tissue engineering an epidermal equivalent.

Journal Article↗

PubMedDate not supplied

Evaluation of a tissue-engineered membrane-cell construct for guided bone regeneration.

PURPOSE: Currently, a number of bioresorbable and biodegradable membranes used for guided bone regeneration lead to incomplete tissue regeneration. Poor mechanical properties, short degradation time, and the lack of integrated biologic components result in the inability to create and maintain an appropriate environment and to actively support tissue remodeling. In the present study, the osteogenic potential of human calvarial periosteal cells in combination with ultrathin polycaprolactone (pc2) membranes of a slow biodegradation rate was investigated. MATERIALS AND METHODS: In vitro and in vivo analyses of the tissue-engineered constructs were conducted using imaging techniques, immunohistochemistry, and histology. Two types of membranes were investigated. Group 1 consisted of a plain membrane, and in group 2 membranes were treated with sodium hydroxide. RESULTS: In vitro results showed that osteoblast-like cells attached and proliferated on the membranes with the formation of extracellular matrix. Sodium hydroxide-treated membranes showed enhanced cell attachment and proliferation kinetics, resulting in a dense cellular layer after 2 weeks in culture. In vivo mineralized tissue formation in association with vascularization was observed. Extracellular matrix calcification with nodule formation was detected via histology as well as scanning electron microscopy. DISCUSSION: PCL membranes support the attachment, growth, and osteogenic differentiation of human primary osteoblast-like cells. Sodium hydroxide-treated membranes demonstrated increased cell attachment resulting from increased hydrophilicity. CONCLUSION: These findings have potential application in the development of a new generation of osteoconductive membranes.

Absorbable Implants↗