다양한 전해액에서 치과용 임플란트의 전기화학적 안정성 평가

Abstract

Titanium and its alloy have been widely used in dental implnat and orthopedic prostheses. Estimation of electrochemical stability of dental implant in various electrolytes have been researched by using electrochemical methods. The Neoplant (Neobiotech Co. Korea) was used for corrosion test in 0.9%NaCl, artificial saliva, simulated body fluids. The surface morphology were observed using scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy(EDX). The electrochemical stability was investigated using potentiosat(EG&G Co, 263A). The corrosion surface were observed using scanning electron microscopy(SEM).

The results were as follows:

1. From the results of potentiodynamic test in various solution, the current density of implant tested in SBF and AS solution was lower than that of implant tested in 0.9% NaCl solution.

2. From the results of passive film stability test, the variation of current density at constant 250mV showed the consistent with time in the case of implant tested in SBF and AS solution, whereas, the current density at constant 250mV in the case of implant tested in 0.9% NaCl solution showed higher compared to SBF and AS solution as time increased.

3. From the results of cyclic potentiodynamic test, the pitting potential and ｜Epit-Ecorr｜of implant tested in SBF and AS solution were higher than those of implant tested in 0.9% NaCl solution.