title: Novel bioceramic-reinforced hydrogel for alveolar bone regeneration.
abstract: The osseointegration of dental implants and their consequent long-term success is guaranteed by the presence, in the extraction site, of healthy and sufficient alveolar bone. Bone deficiencies may be the result of extraction traumas, periodontal disease and infection. In these cases, placement of titanium implants is contraindicated until a vertical bone augmentation is obtained. This goal is achieved using bone graft materials, which should simulate extracellular matrix (ECM), in order to promote osteoblast proliferation and fill the void, maintaining the space without collapsing until the new bone is formed. In this work, we design, develop and characterize a novel, moldable chitosan-pectin hydrogel reinforced by biphasic calcium phosphate particles with size in the range of 100-300μm. The polysaccharide nature of the hydrogel mimics the ECM of natural bone, and the ceramic particles promote high osteoblast proliferation, assessed by Scanning Electron Microscopy analysis. Swelling properties allow significant adsorption of water solution (up to 200% of solution content) so that the bone defect space can be filled by the material in an in vivo scenario. The incorporation of ceramic particles makes the material stable at different pH and increases the compressive elastic modulus, toughness and ultimate tensile strength. Furthermore, cell studies with SAOS-2 human osteoblastic cell line show high cell proliferation and adhesion already after 72h, and the presence of ceramic particles increases the expression of alkaline phosphatase activity after 1week. These results suggest a great potential of the developed moldable biomaterials for the regeneration of the alveolar bone.
  
  
  
  The positive fate of a surgical procedure involving the insertion of a titanium screw still depends on the quality and quantity of alveolar bone which is present in the extraction site. Available materials are basically hard scaffold materials with un-predictable behavior in different condition and difficult shaping properties. In this work we developed a novel pectin-chitosan hydrogel reinforced with ceramic particles. Polysaccharides simulate the extracellular matrix of natural bone and the extensive in vitro cells culture study allows to assess that the incorporation of the ceramic particles promote a pro-osteogenic response. Shape control, easy adaption of the extraction site, predictable behavior in different environment condition, swelling properties and an anti-inflammatory response are the significant characteristics of the developed biomaterial.
authors: Nobil Bio Ricerche Srl, 14037 Portacomaro, Italy; Department of Applied Science and Technology, Institute of Materials Physics and Engineering, Politecnico di Torino, 10121 Torino, Italy. Electronic address: giorgio.iviglia@polito.it.
authors: Giorgio
authors: G
authors: Iviglia
authors: Nobil Bio Ricerche Srl, 14037 Portacomaro, Italy.
authors: Clara
authors: C
authors: Cassinelli
authors: Nobil Bio Ricerche Srl, 14037 Portacomaro, Italy.
authors: Elisa
authors: E
authors: Torre
authors: Department of Applied Science and Technology, Institute of Materials Physics and Engineering, Politecnico di Torino, 10121 Torino, Italy.
authors: Francesco
authors: F
authors: Baino
authors: Nobil Bio Ricerche Srl, 14037 Portacomaro, Italy.
authors: Marco
authors: M
authors: Morra
authors: Department of Applied Science and Technology, Institute of Materials Physics and Engineering, Politecnico di Torino, 10121 Torino, Italy.
authors: Chiara
authors: C
authors: Vitale-Brovarone
mesh_terms: D000539:Alveolar Process / Q000187:drug effects / Q000502:physiology*; D000818:Animals; D001672:Biocompatible Materials / Q000494:pharmacology*; D001861:Bone Regeneration / Q000187:drug effects*; D002448:Cell Adhesion / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002516:Ceramics / Q000494:pharmacology*; D048271:Chitosan / Q000737:chemistry; D019245:Compressive Strength; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D007249:Inflammation / Q000473:pathology; D008264:Macrophages / Q000187:drug effects; D051379:Mice; D010006:Osteoblasts / Q000166:cytology / Q000187:drug effects; D010368:Pectins / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D013314:Stress, Mechanical; D054457:Tissue Scaffolds / Q000737:chemistry; D014867:Water / Q000737:chemistry; D055114:X-Ray Microtomography
chemical_list: D001672:Biocompatible Materials; D014867:Water; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D010368:Pectins; D048271:Chitosan
keywords: Alveolar bone regeneration; Calcium phosphate; Composite; Hydrogel; Scaffold