Research progress of scaffolds for promoting the vascularization of regenerated dental pulp / 口腔疾病防治

@#Endothelial regeneration is a research hotspot in the field of dental pulp. The regeneration of endodontic blood flow is the bottleneck of dental pulp regeneration, and the applied scaffold material is the key to revascularization. Stent materials were reviewed. The literature review Results show that, depending on the source of the stent material used for endodontic revascularization, there are mainly natural, synthetic and composite materials. The natural scaffold materials used for vascular regeneration include chitosan, hyaluronic acid, bacterial cellulose, and proanthocyanidin; artificial scaffold materials include hydrogel, cryogel, and electrospinning. The bionic composite scaffold system with a double-layer tubular structure is low immunogenicity and good biocompatibility. Studies on the scaffold materials of bionic extracellular matrix, such as injectable hydrogels/microspheres, have promoted the development of dental pulp regeneration, that is, uniformly distributed scaffold materials in the root canal promote the generation of pulp-like tissue; Whether dental pulp tissue can establish effective blood circulation through the apical foramen remains a great challenge.

Fabrication of hydroxyapatite-chitosan composite microspheres and their biological effect study in vitro / 安徽医科大学学报

Objective To investigate the influence of HAp-CS composite microsphere scaffold on the in vitro cell behaviors of mesenchymal cells and evaluate its potential application for bone tissue engineering.Methods Nano-hydroxyap-atite (HAp)and chitosan (CS)composites solution were assembled into microsphere scaffold through microfluidic and observed by inverted microscope.Rat bone marrow mesenchymal stem cells were co-cultured in vitro with the microspheres for calculating the adhesion rate for the first 6h.Proliferation rate was measured by cell counting in the next 1,3,6,9 d,respectively,and GraphPad Prism 6 software was used for statistical analysis.The morphology of BMSCs on the surface of HAp-CS composite microsphere was observed by scanning electron micros-copy (SEM)and confocal scanning microscopy.The cells and HAp-CS microspheres were filled into a disc mold and co-cultured for 14 ~21 d to observe the morphology.Results HAp-CS microspheres were observed to be round and with uniform size by microscope.The adhesion rate of BMSCs reached 80% after cultured for 6 h,and proliferation rate reached the highest value when cultured for 6 d.SEM observations showed that BMSCs adhered compactly to the surface of the microspheres,and the microspheres could be connected together through BMSCs.Af-ter co-culturing BMSCs with microspheres for 14 ~21 d,a complete tissue constructs could be formed.Conclusion HAp-CS microspheres are proved to be good scaffolds for promoting BMSCs adhesion and proliferation.Large a-mount of extracellular matrix can be formed to connect microspheres after co-cultured for a certain time,which paves the way for HAp-CS microspheres to be applied for bone regeneration in animal experiments.

Biomimetic Polymer Scaffolds to Promote Stem Cell-Mediated Osteogenesis

Bone tissue engineering using stem cells with osteogenic potential is a promising avenue of research for bone defect reconstruction. Organic, inorganic, and composite scaffolds have all been engineered to provide biomimetic microenvironments for stem cells. These scaffolds are designed to promote stem cell osteogenesis. Here, we review current technologies for developing biomimetic, osteoinductive scaffolds for stem cell applications. We summarize the reported in vitro and in vivo osteogenic effects of these scaffolds on stem cells.