Growth Mechanism of Precipitated Hydroxyapatite at the Surface of Diopside.
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In this study, we ultra structurally evaluated the interface between granular diopside and diopside-induced hydroxyapatite (HAp), and presented a growth mechanism of HAp at the surface of diopside.Specimens were prepared in the following two experiments.<BR>1) Granular diopside immersed in the simulated body fluid for 5 days.<BR>2) Granular diopside implanted into the rabbit bone cavity and left for 1 month.<BR>In the first step, epitaxial crystal growth of octacalcium phosphate (OCP) occurs in the diopside surface layer.The epitaxial relationship of OCP on diopside are as follows, <BR>(001) <SUB>di</SUB>// (010) <SUB>ocp</SUB><BR>[110] <SUB>di</SUB>, // [100] <SUB>ocp</SUB><BR>The lattice mismatch between the c-axis of OCP and [110] of diopside is 3.7% whereas between the a-axis of OCP and three times of [110] period of diopside is 0.05%.<BR>In second step, OCP changed to HAp by topotactic phase transition. The topotactic relationship between OCP and HAp are as follows, <BR>a<SUB>ocp</SUB>=2a HAp<BR>b<SUB>ocp</SUB>=b<SUB>HAp</SUB><BR>c<SUB>ocp</SUB>=c<SUB>HAp</SUB><BR>In the early period, HAp crystals observed were platelet-shaped.It is influecned considerably by the shape of OCP. HAp grows into a hexagonal prism shape.
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