Table 1.

Materials used in this study.

Materials	Composition	Procedures
MI varnish (GC)	30–50% polybinyl acetate, 10–30% hydrogenated rosin, 20–30% ethanol, 1–8% sodium fluoride, 1–5% silicon dioxide	Applied and left undisturbed for 24 h After 24 h MI varnish was carefully removed using a surgical blade without touching surface Wiped by wet gauze Soaked in 50% acetone solution for 5 min
Icon–Etch (DMG)	15% hydrochloric acid, water, pyrogenic silica, surfactant, pigments	Apply the gel and leave it for 2 min Remove excess material with a cotton roll Rinse with water for 30 s Dry with oil—free and water—free air
Icon–Dry (DMG)	Ethanol 99%	Apply an ample amount of material and left it set for 30 s Dry with oil—free and water—free air
Icon–Infiltrant (DMG)	TEGDMA—based resin, initiators and stabilizers	Apply an ample amount of Icon—Infiltrant onto the etched surface Let Icon—Infiltrant set for 3 min Remove excess material with a cotton roll and dental floss Light—cure Icon—Infiltrant for 40 s Repeat the application and let set for 1 min, followed by curing for 40 s
Nupro® Acidulated Phosphate Fluoride (DENTSPLY)	2.59% sodium fluoride (1.23% fluoride ion)	Remove excess material with a cotton roll and dental floss, and light—cure for a minimum of 40 s Apply and leave undisturbed for 4 min Wipe with wet gauze