【摘要】 以XRD和IR为表征手段 ,以恒pH法为溶解实验方法 ,研究了 37℃下以铈单独处理和氟铈联用处理对二水磷酸氢钙 (CaHPO4 ·2H2 O ,DCPD)的水化产物及其溶解性质的影响。Ce3+ 不能促进DCPD向磷灰石转化 ,氟铈联用可加快DCPD的转化。随着Ce3+ 浓度的提高 ,DCPD经含Ce溶液单独处理后的产物主要为CaHPO4 (DCPA) +Ce(PO4 )和Ce(PO4 )。DCPD经氟铈联用处理后的产物主要为DCPA +(Ca2 + ,Ce3+ ) 1 0 -x(PO4 ) 6 -yF2 (F Ce HAP) +Ce(PO4 )和F Ce HAP +Ce(PO4 )。经 1%CeCl3溶液单独处理后的DCPD的抗酸能力已有显著提高。氟铈联用促进溶解度更低的F Ce HAP的形成 ,因此效果优于铈单独处理 ,有可能成为一种有效的防龋方法。更多还原

【Abstract】 The characteristics of the hydrolyzate of calcium hydrogen phosphate (CaHPO 4·2H 2O, DCPD) under 37 ℃ was investigated when it hydrolyzed in solutions containing cerium alone, and in NaF solution, followed by CeCl 3 solutions of different cerium ion concentration. The crystal structure of the hydrolyzate was determined using XRD and IR. A pH static method was used to estimate the dissolution properties of DCPD and its hydrolyzate. Cerium can not transform DCPD into apatite and the combination with fluoride can improve the transformation of DCPD. With the increasing of cerium ion concentration, the hydrolyzate of DCPD in cerium solutions is CaHPO 4+Ce(PO 4) and Ce(PO 4), respectively; and in cerium and fluoride solutions is CaHPO 4+F Ce HAP [(Ca 2+ , Ce 3+ ) 10- x (PO 4) 6- y F 2]+Ce(PO 4) and F Ce HAP+Ce(PO 4), respectively. The antiacid ability is improved greatly when DCPD hydrolyzes in 1% CeCl 3 solution. The result reveals that a combination of fluoride and cerium has a stronger inhibitory effect on dissolution of DCPD as F Ce HAP is less resolvable than Ce HAP. So it can be concluded that combination of fluoride and cerium may be an effective anticaries method.更多还原