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首页> 外文会议>International conference on advanced ceramics and composites >CARBONATE APATITE FORMATION DURING THE SETTING REACTION OF APATITE CEMENT
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CARBONATE APATITE FORMATION DURING THE SETTING REACTION OF APATITE CEMENT

机译：磷灰石水泥设定反应期间碳酸盐磷灰石形成

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Replacement of apatite cement (AC) to bone is still controversial issue. To understand factor that could affect the replacement of AC to bone, AC consisting of an equimolar mixture of tetracalcium phosphate (TTCP; Ca_4(PO_4)O) and dicalcium phosphate anhydrous (DCPA; CaHPO_4) was allowed to set at 37°C and 100% relative humidity under 5% CO_2 or N_2. Carbonate apatite (CO_3AP) was formed when AC was allowed to set under 5% CO_2. The amount of CO_3 decreased gradually as the depth from the surface increased. The CO_3AP was the B-type CO_3AP in which CO_3~(2-) was replaced with PO_4~(3-) and the CO_3AP found in bone. Larger amount of TTCP remain unreacted when the AC was allowed to set under N_2 whereas smaller amount of TTCP remain unreacted when the AC was allowed to set under CO_2. This may be caused by the larger Ca/P molar ratio of CO_3AP. Formation of CO_3AP and/or small unreacted TTCP are thought to be key factors for the replacement of AC to bone.
机译：更换磷灰石水泥（AC）到骨骼仍然存在争议问题。理解可能影响AC到骨的替换的因素，AC由磷酸四钙（TTCP; CA_4（PO_4））的等摩尔混合物组成，允许磷酸二钙无水（DCPA; CAHPO_4）设定在37°C和100 5％CO_2或N_2下的％相对湿度。当允许Ac被设定为5％CO_2时，形成碳酸盐磷灰石（CO_3AP）。随着表面的深度增加，CO_3的量逐渐降低。 CO_3AP是B型CO_3AP，其中用PO_4〜（3-）替换CO_3〜（2-）和骨中的CO_3AP。当允许AC设置在N_2下，当允许在允许在CO_2下设定时，当较少量的TTCP保持未反应时，较大量的TTCP保持未反应。这可能是CO_3AP的较大CA / P摩尔比引起的。 CO_3AP的形成和/或小未反应的TTCP被认为是替换AC到骨骼的关键因素。

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