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<p>The processes occurring at the solid–liquid interface of hydroxyapatite ceramic tablets placed in contact with simulated de- and remineralization solutions similar to those in the oral cavity are investigated. A solution containing lactic acid was chosen as a demineralizing agent because it mimics the conditions during bacterial decomposition of sugars. A two-stage remineralization procedure was applied—treatment with a solution of polycarboxybetaine, followed by a stay in artificial saliva. The results show that the demineralisation causes changes in the quantitative ratios of the major elements on the surface, but not in their chemical environment. The mechanism of the dissolution depends on the time. It starts with a higher rate in the center and a lower rate in the periphery. The two speeds equalize over time. During the remineralization procedure, as an effect of the interaction with the solution’s components, new surface species like Ca–OH and Na–O–P are formed and the quantity of O–H(C–O) and C–O(C–N) increases. Since the Raman spectra do not show the presence of any phase other than hydroxyapatite, we assume that remineralization occurs through the growth of HA crystals.</p>

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Characterization of the Hydroxyapatite Ceramic Surfaces in Contact with Simulated De- and Remineralisation Solutions

  • 期刊论文

  • 发表日期：

    2025年5月2日

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  • Radost Ilieva,
  • Ivalina Avramova,
  • Marin Simeonov,
  • Diana Rabadjieva

摘要

The processes occurring at the solid–liquid interface of hydroxyapatite ceramic tablets placed in contact with simulated de- and remineralization solutions similar to those in the oral cavity are investigated. A solution containing lactic acid was chosen as a demineralizing agent because it mimics the conditions during bacterial decomposition of sugars. A two-stage remineralization procedure was applied—treatment with a solution of polycarboxybetaine, followed by a stay in artificial saliva. The results show that the demineralisation causes changes in the quantitative ratios of the major elements on the surface, but not in their chemical environment. The mechanism of the dissolution depends on the time. It starts with a higher rate in the center and a lower rate in the periphery. The two speeds equalize over time. During the remineralization procedure, as an effect of the interaction with the solution’s components, new surface species like Ca–OH and Na–O–P are formed and the quantity of O–H(C–O) and C–O(C–N) increases. Since the Raman spectra do not show the presence of any phase other than hydroxyapatite, we assume that remineralization occurs through the growth of HA crystals.