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目的:通过X线衍射技术分析硫酸亚铁、氟化钠处理釉粉后形成新物质的物相及对釉质晶格的影响,以探讨Fe~(2+)、F~-增强釉质抗酸性的作用机制。方法:收集磨牙50颗,切取釉质并研磨成粉末共10 g,平均分为4组:C组(对照组,去离子水)、Fe~(2+)组(15 mmol/L Fe SO4)、F-组(1.23%Na F)、Fe~(2+)+F-组(15 mmol/L Fe SO_4+1.23%Na F)。将样本在各组实验溶液中孵育48 h,然后进行脱矿-再矿化循环,共6次。1个完整周期包括:1在5 m L可口可乐(p H=2.58)中脱矿5 min;2在37℃5 m L人工唾液中再矿化1 h。将釉粉在40℃下烘干,进行X射线衍射分析。结果:XRD定性分析显示,硫酸亚铁溶液使X衍射谱线半宽高增宽、变平缓。釉质晶粒尺寸减小,结晶度降低。次要相检索显示有新物相磷酸铁生成;铁氟联合作用与氟化物单独作用衍射谱线相似,使衍射峰半高宽变窄、变尖锐,提高了晶体的结晶度。次要相检索有氟化钙生成。结论:Fe~(2+)、F-均对釉质晶体结构有一定影响。高浓度F-和Fe~(2+)联合作用时Fe~(2+)的作用被掩盖。Fe~(2+)可能通过替换Ca~(2+)而使釉质晶粒减小,结晶度降低;同时,Fe~(2+)和釉质表面溶解的PO_4~(3-)结合,形成磷酸铁抗酸沉淀;F~-通过替换OH~-,参与釉质再矿化,使釉质结晶度增加,同时在釉质表面形成氟化钙沉淀,抵抗釉质酸蚀。
OBJECTIVE: To analyze the effect of ferrous sulfate and sodium fluoride on the formation of new materials and their influence on the enamel lattice by means of X-ray diffraction (XRD), in order to investigate the effects of Fe ~ (2 +), F ~ - enhancing enamel acid resistance Mechanism. Methods: 50 molars were collected, enamel was excised and ground to a total of 10 g powder, divided into 4 groups: C group (control group, deionized water), Fe 2+ group (15 mmol / L Fe SO4) F-group (1.23% Na F) and Fe 2+ (2 +) + F-group (15 mmol / L Fe SO 4 + 1.23% Na F). Samples were incubated for 48 h in each group of experimental solutions, followed by demineralization-remineralization cycles for a total of 6 times. One complete cycle includes: 1 Demineralization in 5 m L Coca-Cola (p H = 2.58) for 5 min; 2 Remineralization in 5 m L artificial saliva at 37 ° C for 1 h. The glaze powder was dried at 40 ° C and subjected to X-ray diffraction analysis. Results: The qualitative analysis of XRD showed that the ferrous sulfate solution broadened and broadened the half-width of the X-ray diffraction spectrum. Enamel grain size decreases, crystallinity decreases. The secondary phase search revealed the formation of a new phase of iron phosphate; the combined action of iron and fluorine was similar to that of fluoride alone, which narrowed and sharpened the FWHM of the diffraction peak and increased the crystallinity of the crystals. Secondary phase search with calcium fluoride generated. Conclusion: Fe ~ (2 +) and F- all have some influence on the crystal structure of enamel. The effect of Fe ~ (2+) at high concentrations of F - and Fe ~ (2+) was masked. Fe2 + may reduce enamel grains and crystallinity by replacing Ca2 +, and combine with PO4- (3-) dissolved on the surface of enamel to form phosphoric acid Iron acid-resistant precipitation; F ~ - through the replacement of OH ~ -, involved in enamel remineralization, enamel crystallinity increased, while the formation of calcium fluoride precipitation on the enamel surface, resistance to enamel erosion.