Table 1.
Chemical compositions of the utilized dental alloys (wt.%).
Table 2.
A composition of the TSB (g/L) solution utilized in this study.
Table 3.
A composition of the AS (g/L) solution obtained at pH = 6.8.
Fig 1.
OCP values obtained for CoCr and NiCr alloys treated in Solutions 1 and 2 at 37°C.
Fig 2.
(a) Nyquist and (b) Bode plots obtained for CoCr and NiCr alloys treated in Solutions 1 and 2 at 37°C.
Fig 3.
Equivalent circuits utilized for fitting the EIS results obtained in the (a) absence and (b) presence of S. mutans species.
Rs: solution resistance in the vicinity of the test sample, R1: charge-transfer resistance of CoCr and NiCr alloys, CPE1: double-layer capacitance of CoCr and NiCr alloys, R2: resistance of the biofilm binding layer, CPE2: capacitance of the biofilm binding layer.
Fig 4.
(a) A Nyquist plot fitted using the R(QR) circuit. (b) A Bode plot fitted using the R(QR) circuit. (c) A Nyquist plot fitted using the R(Q(R(QR)))) circuit. (d) A Bode plot fitted using the R(Q(R(QR)))) circuit.
Table 4.
Impedance parameters obtained for the two alloys immersed in the AS solutions with and without S. mutans species.
Fig 5.
SEM images of the (a) CoCr and (b) NiCr alloy specimens exposed to the mixture of AS with S. mutans species for 24 h (magnification: 3, 000×).
Fig 6.
Typical potentiodynamic polarization curves obtained for CoCr and NiCr alloys treated with Solutions 1 and 2.
Table 5.
OCPs (vs. Ag/AgCl) obtained from Fig 2 and icorr values estimated from the potentiodynamic polarization studies of CoCr and NiCr alloys treated with Solutions 1 and 2 (x±s).