Post-bleaching Fluoridation and Demineralization
The Ca concentrations of the samples were measured at the end of the 4th, 8th 12th, and 16th days (Table 2, Figure 1). The loss of Ca in the control, 38% HP, 38% HP + NaF, and 38% HP + TiF4 groups were evaluated cumulatively every 4 days, and at the end of the 16th day, 15.07 ± 1.81 μg/mL, 22.44 ± 2.52 μg/mL, 13.67 ± 1.86 μg/mL, and 9.12 ± 2.40 μg/mL were obtained in total, respectively (Figure 2).
(Enlarge Image)
Figure 1.
The calcium ion (Ca) concentrations of the specimens measured at the end of the 4th, 8th, 12th, and 16th days (μg/mL).
(Enlarge Image)
Figure 2.
The total calcium ion (Ca concentrations of the specimens measured at the end of the 16th day (mg/ml).
The loss of Ca in each of the test groups was compared with that of the control group using the Friedman test. A statistically significant difference was observed among the groups after 4, 8, 12 and 16 days and in total (p < 0.05). The Wilcoxon test was used to identify possible statistically significant differences between the groups.
After the demineralization process, there was significantly less Ca released in the bleached/fluoride-treated groups (38% HP + NaF and 38% HP + TiF4) than in the bleached-only group (38% HP) and control group. When the NaF and TiF4-treated samples were compared, there were no significant differences between the amounts of Ca released from the specimens after the 4th, 8th, and 16th days (p > 0.05). However, at the end of the test period, the total amount of Ca in the buffer solution was significantly less for the TiF4-treated samples than for the NaF-treated samples (p < 0.05) (Table 2 and Table 3). Thus, it might be suggested that TiF4-treated samples were more acid-resistant than NaF-treated samples.
Results
The Ca concentrations of the samples were measured at the end of the 4th, 8th 12th, and 16th days (Table 2, Figure 1). The loss of Ca in the control, 38% HP, 38% HP + NaF, and 38% HP + TiF4 groups were evaluated cumulatively every 4 days, and at the end of the 16th day, 15.07 ± 1.81 μg/mL, 22.44 ± 2.52 μg/mL, 13.67 ± 1.86 μg/mL, and 9.12 ± 2.40 μg/mL were obtained in total, respectively (Figure 2).
(Enlarge Image)
Figure 1.
The calcium ion (Ca) concentrations of the specimens measured at the end of the 4th, 8th, 12th, and 16th days (μg/mL).
(Enlarge Image)
Figure 2.
The total calcium ion (Ca concentrations of the specimens measured at the end of the 16th day (mg/ml).
The loss of Ca in each of the test groups was compared with that of the control group using the Friedman test. A statistically significant difference was observed among the groups after 4, 8, 12 and 16 days and in total (p < 0.05). The Wilcoxon test was used to identify possible statistically significant differences between the groups.
After the demineralization process, there was significantly less Ca released in the bleached/fluoride-treated groups (38% HP + NaF and 38% HP + TiF4) than in the bleached-only group (38% HP) and control group. When the NaF and TiF4-treated samples were compared, there were no significant differences between the amounts of Ca released from the specimens after the 4th, 8th, and 16th days (p > 0.05). However, at the end of the test period, the total amount of Ca in the buffer solution was significantly less for the TiF4-treated samples than for the NaF-treated samples (p < 0.05) (Table 2 and Table 3). Thus, it might be suggested that TiF4-treated samples were more acid-resistant than NaF-treated samples.