title: The physicochemical characterization and in vivo response of micro/nanoporous bioactive ceramic particulate bone graft materials.
abstract: In this study, the physicochemical characteristics of calcium phosphate based bioactive ceramics of different compositions and blends presenting similar micro/nanoporosity and micrometer scale surface texture were characterized and evaluated in an in vivo model. Prior to the animal experiment, the porosity, surface area, particle size distribution, phase quantification, and dissolution of the materials tested were evaluated. The bone regenerative properties of the materials were evaluated using a rabbit calvaria model. After 2, 4, and 8 weeks, the animals were sacrificed and all samples were subjected to histologic observation and histomorphometric analysis. The material characterization showed that all materials tested presented variation in particle size, porosity and composition with different degrees of HA/TCP/lower stoichiometry phase ratios. Histologically, the calvarial defects presented temporal bone filling suggesting that all material groups were biocompatible and osteoconductive. Among the different materials tested, there were significant differences found in the amount of bone formation as a function of time. At 8 weeks, the micro/nanoporous material presenting ~55%TCP:45%HA composition ratio presented higher amounts of new bone regeneration relative to other blends and a decrease in the amount of soft tissue infiltration.
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, NY, USA.
authors.forename: Nick
authors.initials: N
authors.lastname: Tovar
authors.affiliation: Department of Prosthodontics, Faculty of Odontology, Malmo University, Sweden; Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University, Nagasaki, Japan. Electronic address: ryo.jimbo@mah.se.
authors.forename: Ryo
authors.initials: R
authors.lastname: Jimbo
authors.affiliation: Department of Chemical Engineering, OK State University, Stillwater, USA.
authors.forename: Lukasz
authors.initials: L
authors.lastname: Witek
authors.affiliation: Department of Dental Materials and Prosthodontics, Sao Paulo State University-UNESP, Sao Paulo, Brazil.
authors.forename: Rodolfo
authors.initials: R
authors.lastname: Anchieta
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, NY, USA.
authors.forename: Daniel
authors.initials: D
authors.lastname: Yoo
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, NY, USA.
authors.forename: Lakshmipradha
authors.initials: L
authors.lastname: Manne
authors.affiliation: Department of Dental Materials and Prosthodontics, Sao Paulo State University-UNESP, Sao Paulo, Brazil.
authors.forename: Lucas
authors.initials: L
authors.lastname: Machado
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, NY, USA.
authors.forename: Riddhi
authors.initials: R
authors.lastname: Gangolli
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, NY, USA.
authors.forename: Paulo G
authors.initials: PG
authors.lastname: Coelho
mesh_terms: D000818:Animals; D016025:Bone Transplantation; D002516:Ceramics; D008855:Microscopy, Electron, Scanning; D023421:Models, Animal; D053758:Nanoparticles; D011817:Rabbits; D014961:X-Ray Diffraction
keywords: Animal experiment; Calcium phosphate materials; Histomorphometry; Porosity