Table 1.

F content changes and Ca/P ratios

Group	Difference in F content	Ca-to-P ratio (Ca/P)
Con	112.3 ± 32.8*	1.285
PD	71.7 ± 13.8*	1.292
NaF	107.5 ± 4.9*	1.346
Var	135.0 ± 25.3*	1.338
PD/F	182.0 ± 6.6+	1.355

$\mathrm{Difference}\mathrm{in}\mathrm{F}\mathrm{content}=\frac{finalfluoridecontent\left(a,t,\%\right)-initialfluoridecontent\left(a,t,\%\right)}{initialfluoridecontent\left(a,t,\%\right)}\times 100(\%)$  

⁺Indicates a significant difference between changes in F contents compared to Con (P < 0.05)

^*Indicates a significant difference between changes in F contents compared to PD/F (P < 0.05)