title: Brushite-collagen composites for bone regeneration.
abstract: Brushite-based biomaterials are of special interest in bone regeneration due to their biocompatibility and biodegradability; on the other hand, collagen is a well-known osteoconductive biomaterial. In the present study a new brushite-collagen composite biomaterial is reported. This new biomaterial was prepared by combining citric acid/collagen type I solutions with a brushite cement powder. The obtained biomaterial was a cement paste, with improved handling properties. The effect of collagen on the setting reaction of brushite cement was studied, and was found to speed up the cement setting reaction. The cement paste set into a hard ceramic material within 18.5+/-2.1min and had compressive strength similar to that of spongeous bone (48.9+/-5.9MPa in dry conditions and 12.7+/-1.5MPa in humid conditions). The combination of collagen with citric acid revealed an interesting synergistic effect on the compressive strength of the composite material. Moreover, this new biomaterial had excellent cohesion properties (ninefold better than brushite cement), and high cellular adhesion capacity (threefold higher than brushite cement). The composite biomaterial described in this study combines good handling properties, compressive strength, cohesion and cell adhesion capacity, along with the osteoconductive and biodegradable properties inherent in brushite and in collagen-based biomaterials.
authors.affiliation: Faculty of Dentistry, McGill University, Montreal, Quebec, Canada. faleh.taminimarino@mail.mcgill.ca
authors.forename: Faleh
authors.initials: F
authors.lastname: Tamimi
authors.forename: Balamurugan
authors.initials: B
authors.lastname: Kumarasami
authors.forename: Charles
authors.initials: C
authors.lastname: Doillon
authors.forename: Uwe
authors.initials: U
authors.lastname: Gbureck
authors.forename: Damien
authors.initials: D
authors.lastname: Le Nihouannen
authors.forename: Enrique Lopez
authors.initials: EL
authors.lastname: Cabarcos
authors.forename: Jake E
authors.initials: JE
authors.lastname: Barralet
mesh_terms: D016475:3T3 Cells; D000818:Animals; D001843:Bone Cements / Q000737:chemistry*; D001861:Bone Regeneration / Q000502:physiology*; D018786:Bone Substitutes / Q000737:chemistry*; D002130:Calcium Phosphates / Q000737:chemistry*; D002448:Cell Adhesion / Q000502:physiology*; D049109:Cell Proliferation; D024042:Collagen Type I / Q000737:chemistry*; D008420:Manufactured Materials; D008422:Materials Testing; D051379:Mice; D016348:Osseointegration / Q000502:physiology; D012038:Regeneration / Q000502:physiology*
chemical_list: D001843:Bone Cements; D018786:Bone Substitutes; D002130:Calcium Phosphates; D024042:Collagen Type I; C494366:calcium phosphate, dibasic, dihydrate