Microleakage of Resin Infiltration in Artificial White Lesion

Objectives:

The purpose of this in vitro study was to determine the microleakage of resin infiltration after applying on artificial white lesions (AWL).
Methods: A total of 50 sound premolar teeth extracted for orthodontics purpose were included in this study. The specimens were randomly divided into five groups (n=10), as follows: Group 1, sound teeth (control); Group 2, no treatment of AWL; Group 3, AWL treated with resin infiltrant ; Group 4, AWL treated with resin infiltrant and 5,000 cycles of thermocycling; Group 5, AWL treated with resin infiltrant and 10,000 cycles of thermocycling. Each specimen in group 2–5 were immersed in demineralizing and remineralizing solutions to create AWL. All specimens were then coated with nail varnish except 4x4 mm² area on buccal surface as measuring area. All of the specimens were immersed in 2% methylene blue solution at 37°C. After 24 hours, the specimens were rinsed under running tap water and then sectioned mesiodistally. The microleakage was determined using stereomicroscope under 40X magnification. The data was analyzed using the Kruskal-Wallis one-way analysis independent of variance at 95% confidence.
Results: The result of this study showed that applying resin infiltrant can reduce the microleakage in AWL. Complete absence of microleakage was observed in group 3. And the result showed no statistically significant differences among Group 3, 4 and 5 (p > 0.05).
Conclusions: Resin infiltration technique appears to have sealing ability on enamel white lesions. Furthermore, it has long term potential to protect microleakage in enamel white lesions.