The effects of Na4P2O7 · 10H2O addition on the mechanical properties of sintered Ca2P2O7 bioceramic
Journal
Materials Chemistry and Physics
Journal Volume
41
Journal Issue
2
Pages
110-116
Date Issued
1995
Author(s)
Abstract
From the viewpoint of hard tissue response to implant materials, calcium phosphates are probably the most compatible materials presently known. Thus, during the last few years much attention has been paid to hydroxyapatite and β-tricalcium phosphate as potential biomaterials for bone substitute. However, the disadvantage of all proposed calcium phosphate ceramics is their low mechanical strength. Therefore, the applicability of these materials is restricted to the non-stressed regions. The ultimate good of implantation of biomaterials in the skeleton is to reach full integration of non-living implant with living bone. The material could be used, much as a bone graft, as material itself resorbs or dissolves as bone growth occurs, and the end result is new remolded bone. Ca2P2O7 is one of intermediate products of bone mineralized crystal from amorphous calcium phosphates. Ca2P2O7 doped with a certain amount of Na4P2O7 · 10H2O was prepared as the developed material. In this study, Na4P2O7 · 10H2O was used as a liquid phase sintering additive which was expected to improve the sintering process and promote physiological bioresorbability. Compressive strength and four-point bending strength were measured by the Bionix 858 test system. At the beginning, the mechanical strength proportionally increased with addition of Na4P2O7 · 10H2O up to 5 wt.%, but thereafter decreased. The microstructure and crystalline identification were analyzed by the techniques of scanning electron microscopy (SEM), electron probe micro-analysis (EPMA), transmission electron microscopy (TEM) and X-ray diffraction (XRD). The relationship between mechanical strength of the sintered bioceramics and Na4P2O7 · 10H2O dopant is given in terms of the presence of NaCa(PO3)3, grain growth and abnormal grain coalescence while dopant increased. © 1995.
Type
journal article