title: Apatite bone cement reinforced with calcium silicate fibers.
abstract: Several research efforts have been made in the attempt to reinforce calcium phosphate cements (CPCs) with polymeric and carbon fibers. Due to their low compatibility with the cement matrix, results were not satisfactory. In this context, calcium silicate fibers (CaSiO3) may be an alternative material to overcome the main drawback of reinforced CPCs since, despite of their good mechanical properties, they may interact chemically with the CPC matrix. In this work CaSiO3 fibers, with aspect ratio of 9.6, were synthesized by a reactive molten salt synthesis and used as reinforcement in apatite cement. 5 wt.% of reinforcement addition has increased the compressive strength of the CPC by 250% (from 14.5 to 50.4 MPa) without preventing the cement to set. Ca and Si release in samples containing fibers could be explained by CaSiO3 partial hydrolysis which leads to a quick increase in Ca concentration and in silica gel precipitation. The latter may be responsible for apatite precipitation in needle like form during cement setting reaction. The material developed presents potential properties to be employed in bone repair treatment.
authors: Bioceramics Laboratory - Science and Technology Institute, UNIFESP, 330 Talim Street - Vila Nair, São José dos Campos, SP, Brazil, motisuke@unifesp.br.
authors: Mariana
authors: M
authors: Motisuke
authors: Verônica R
authors: VR
authors: Santos
authors: Naiana C
authors: NC
authors: Bazanini
authors: Celso A
authors: CA
authors: Bertran
mesh_terms: D001031:Apatites / Q000737:chemistry*; D001843:Bone Cements / Q000138:chemical synthesis / Q000737:chemistry; D018786:Bone Substitutes / Q000138:chemical synthesis / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D020099:Coated Materials, Biocompatible / Q000138:chemical synthesis / Q000737:chemistry; D019245:Compressive Strength; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D057139:Nanofibers / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D013499:Surface Properties; D014961:X-Ray Diffraction
chemical_list: D001031:Apatites; D001843:Bone Cements; D018786:Bone Substitutes; D017610:Calcium Compounds; D020099:Coated Materials, Biocompatible; D017640:Silicates; C031293:calcium silicate