Electrochemical behavior and pH stability of artificial salivas for corrosion tests.
It is assumed that the compositions of artificial salivas are similar to that of human saliva. However, the use of solutions with different compositions in in vitro corrosion studies can lead dissimilar electrolytes to exhibit dissimilar corrosivity and electrochemical stability. This study evaluated four artificial salivas as regards pH stability with time, redox potentials and the polarization response of an inert platinum electrode. The tested solutions were: SAGF medium, Mondelli artificial saliva, UFRJ artificial saliva (prepared at the School of Pharmacy, Federal University of Rio de Janeiro, RJ, Brazil) and USP-RP artificial saliva (prepared at the School of Pharmaceutical Sciences of Ribeirão Preto, University of São Paulo, SP, Brazil). It was observed that pH variations were less than 1 unit during a 50-hour test. The SAGF medium, and the UFRJ and USP-RP solutions exhibited more oxidizing characteristics, whereas the Mondelli solution presented reducing properties. Anodic polarization revealed oxidation of the evaluated electrolytes at potentials below +600 mV SCE. It was observed that the UFRJ and USP-RP solutions presented more intense oxidation and reduction processes as compared to the Mondelli and SAGF solutions.
Queiroz
Gláucia Maria Oliveira de
GM
Gama Filho University, Rio de Janeiro, Brazil.
Silva
Leandro Freitas
LF
Ferreira
José Tarcísio Lima
JT
Gomes
José Antônio da Cunha P
JA
Sathler
Lúcio
L
D001672:Biocompatible Materials / Q000737:chemistry*; D003343:Corrosion; D003722:Dental Alloys / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D008422:Materials Testing; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D010984:Platinum / Q000737:chemistry*; D012464:Saliva, Artificial / Q000737:chemistry*; D012996:Solutions
D001672:Biocompatible Materials; D003722:Dental Alloys; D012464:Saliva, Artificial; D012996:Solutions; D010984:Platinum