EFFECT OF SILVER DIAMINE FLUORIDE AND POTASSIUM IODIDE ON ARTIFICIAL ROOT CARIES SUBJECTED TO DEMINERALIZATION

Silver diamine fluoride (SDF) is now considered as an efficient, non-invasive material that can be used in prevention and arresting of dental caries. Potassium iodide (KI) is used to reduce the dental staining produced by SDF. The aim of this study was to assess the effect of SDF+KI application on demineralized dentin immediately after application and 3 days after a simulated caries attack. Materials and methods. Demineralized dentin specimens were treated by applying SDF-KI. Half of the specimens were stored in lactate buffer solution for 3 days. The specimens were subsequently analyzed by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Results. SEM evaluation of SDF+KI treated specimens showed a thin continuous layer of material covering the dentin surface. The EDS analysis showed decreasing percentages of silver and iodine, concurrent with the increase of calcium and phosphate concentrations from the external surface towards the inner dentin. The specimens subjected to the acidic challenge after SDF+KI application showed the same pattern of element distribution. Conclusions. The application of SDF-KI on demineralized dentin resulted in the formation of an external layer containing high percentages of silver and iodine. The silver-rich layer was resistant to acidic challenge and effective in protecting the subjacent dentin from further demineralization.