Electrochemical behavior and surface characterization of dental materials in artificial salivary

Abstract Research concerning the applications of ceramic biomaterials as dental restorative materials is of particular interest for the study of the physico-chemical, mechanical and microstructural behavior with a multitude of techniques. Nevertheless, the wealth of scientific articles in this field remains vast and poor in terms of all-ceramic restorative materials, their ageing and electrochemical degradation behavior utilizing the electrochemical impedance spectroscopy, in contact with an electrolytic solution which can cause and exhibit a very remarkable variation in the surface state and variation in the stability of the electrochemical behavior of these dental materials, which can be influenced by pH, temperature and the medium variations. Ringer's solution as artificial saliva has been used as a degradation medium to evaluate the effect of saliva on the microstructure, surface condition, chemical composition and degradation behavior of dental materials. This is done using X-ray diffraction, SEM-coupled energy dispersive spectrometry (EDX) and electrochemical impedance spectroscopy as a technique to assess the interface degradation behavior of these materials after 21 days of immersion in salivary medium. The aim of this study was to identify and evaluate the changes in the electrochemical behavior of these 2 ceramic materials, Feldspar and Alumina after immersion in Ringer solution for 7, 14, 21 days at 37 °C and pH = 7.3 by XRD, SEM / EDX and their electrochemical behavior by EIS. These results indicate that there is a significant effect of synthetic Ringer's salivary solution on the ceramics studied; this effect is manifested by degradation through the release and/or dissolution of certain ionic compounds. It is also important to note that this dissolution could result in the deposition of layers on the surface of dental materials; this is even more important depending on the immersion time.