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Influence of Phase Purity on the in Vivo Response to Hydroxyapatite

机译:相纯度对体内对羟基磷灰石反应的影响

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Two batches of calcium phosphate implants, termed HA1 and HA2 were prepared with calcium to phosphorus ratios of 1.67 and 1.70 respectively. XRD demonstrated that the HA1 implants were composed of phase pure hydroxyapatite, while the phase composition of the HA2 implants contained approximately 5 percent calcium oxide with the balance being hydroxyapatite. Sintered cylindrical implants, 3 mm in diameter, were prepared from each of the powders, containing slots 1 mm wide x 2 mm deep in one circular face. The implants were implanted laterally in the distal femur of 6 month old New Zealand white rabbits for a period of 3 weeks. Subsequent histological evaluation demonstrated that the presence of the CaO impurity phase significantly reduced the osteoconductivity, as demonstrated by minimal penetration of new bone within HA2 implant slots and a significant reduction in direct bone apposition on any of the HA2 implant surfaces as compared with HA1 implants. This study has confirmed the need for precise control of the phase purity of hydroxyapatite based bioceramics for optimal biological performance.
机译:制备了两批磷酸钙植入物,分别称为HA1和HA2,钙磷比分别为1.67和1.70。 XRD证明HA1植入物由相纯的羟基磷灰石组成,而HA2植入物的相组成包含约5%的氧化钙,其余为羟基磷灰石。用每种粉末制备直径为3毫米的烧结圆柱状植入物,在一个圆面上有1毫米宽×2毫米深的缝隙。将植入物横向植入6个月大的新西兰白兔的股骨远端,持续3周。随后的组织学评估表明,CaO杂质相的存在显着降低了骨传导性,与HA1植入物相比,新骨在HA2植入物槽内的渗透极小,并且在任何HA2植入物表面上的直接骨并置显着减少,证明了这一点。这项研究已证实需要精确控制基于羟基磷灰石的生物陶瓷的相纯度,以获得最佳的生物性能。

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