title: A synthetic aragonite-based bioceramic: influence of process parameters on porosity and compressive strength.
abstract: We investigate the influence of process parameters such as weight fraction and particle size of pore-former, and isostatic pressure, on porosity and compressive strength of non-sintered porous calcium carbonate biomaterials compacted at high pressure in uniaxial or isostatic mode. Experiment design and results analysis are performed according to a two-level 2k factorial design method (FDM). Results indicate that only the weight fraction of pore-former (wt fpf) influences significantly the porosity and the compressive strength. The porosity P, is described by a linear function of wt fpf, and the compressive strength sigma(comp), by an exponential one. For materials compacted under uniaxial pressing: P (vol%) = 33.7 + 85.4 (wt fpf) and sigma(comp) (MPa) = 28.8e(-9.2(wt fpf)) with 0.1 < or = wt fpf < or = 0.3. For materials compacted in isostatic mode: P (vol%) = 33.9 + 82.1 (wt fpf) and sigma(comp) (MPa) = 24.0e(-7.0(wt fpf)) with 0.15 < or = wt fpf < or = 0.35. The pore-former particle size has no significant influence on both properties. The increase in isostatic pressure provides slightly lower porosity and better compressive strength. For a fixed fraction of pore-former, isostatic pressing leads to a better compressive strength than uniaxial pressing. This study indicates that, for a constant amount of pore former, the size of macropores can be adjusted to reach optimal bone-ingrowth without change in compressive strength.
authors.affiliation: Institut de Chimie de Rennes, Université de Rennes 1, UMR 6511, Cristallochimie et Biomatériaux, CS 74205, France. anita.lucas@univ-rennes1.fr
authors.forename: A
authors.initials: A
authors.lastname: Luca-Girot
authors.forename: P
authors.initials: P
authors.lastname: Langlois
authors.forename: J C
authors.initials: JC
authors.lastname: Sangleboeuf
authors.forename: A
authors.initials: A
authors.lastname: Ouammou
authors.forename: T
authors.initials: T
authors.lastname: Rouxel
authors.forename: J
authors.initials: J
authors.lastname: Gaude
mesh_terms: D001672:Biocompatible Materials; D002119:Calcium Carbonate / Q000737:chemistry*; D002516:Ceramics; D008422:Materials Testing
chemical_list: D001672:Biocompatible Materials; D002119:Calcium Carbonate