Abstract
Two types of pure and Na{sub 2}O added calcium metaphosphate (CMP), amorphous and crystalline, were prepared by the quenching from the melt and the crystallization of the amorphous CMP, respectively. Two specimens were soaked into tris-buffer solution and SBF for 1 day to 3 weeks. The weight decrease of the amorphous specimens was significantly higher than that of the crystalline specimens with the soaking time in the both solutions. The addition of Na{sub 2}O in CMP effects the weight change in the amorphous CMP, but not significant in crystalline CMP. And the addition of Na{sub 2}O in CMP also changes the deposition of calcium phosphate minerals, which is related to the dissolution of the CMP materials. The degradation and deposition was faster in the SBF than the tris-buffer solution. (orig.)
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