氟化人牙釉质的溶解度、晶胞尺寸和结晶度。

Solubility, unit cell dimensions and crystallinity of fluoridated human dental enamel.

作者信息

Larsen M J, Jensen S J

机构信息

Department of Oral Anatomy, Dental Pathology and Operative Dentistry, Royal Dental College, Aarhus, Denmark.

出版信息

Arch Oral Biol. 1989;34(12):969-73. doi: 10.1016/0003-9969(89)90054-x.

DOI:10.1016/0003-9969(89)90054-x

PMID:2558642

Abstract

The aim was to describe the dimensions of the fluorhydroxyapatite unit cell and the solubility of fluorhydroxyapatite as a function of the fluoride concentration in the apatitic lattice. Various amounts of powdered human dental enamel were suspended in a pH 4.5 acetate buffer containing fluoride. The suspensions were equilibrated for 365 days at 20 degrees C. After equilibration the fluoride concentration in the apatite varied from 0.003 to 0.89 (mole fraction). X-ray diffraction showed that the length of the alpha-axis decreased with increasing fluoride concentration, whilst a broadening of the (300) reflection indicated the presence of mixtures of various fluorhydroxyapatites. The solubility of the apatite after the long equilibration decreased slightly with increasing fluoride concentration in the solid. In a few samples the fluoride concentration in the aqueous phase was still discernible, indicating that even after 365 days, equilibrium had not been attained. In these samples the amount of dissolved apatite was extraordinarily low.

摘要

目的是描述氟羟基磷灰石晶胞的尺寸以及氟羟基磷灰石在磷灰石晶格中作为氟化物浓度函数的溶解度。将不同量的人牙釉质粉末悬浮在含氟的pH 4.5醋酸盐缓冲液中。悬浮液在20℃下平衡365天。平衡后，磷灰石中的氟化物浓度在0.003至0.89（摩尔分数）之间变化。X射线衍射表明，α轴长度随氟化物浓度增加而减小，而(300)反射的变宽表明存在各种氟羟基磷灰石的混合物。长时间平衡后，磷灰石的溶解度随固体中氟化物浓度的增加而略有下降。在少数样品中，水相中仍可检测到氟化物浓度，这表明即使经过365天，仍未达到平衡。在这些样品中，溶解的磷灰石量极低。