الفهرس 
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Abstract
The aim of the study was to evaluate and compare the effect of pH cycling mode on the fluoride release and uptake of ACTIVA™ and Fuji II LC glass ionomer restorative material.
Forty-four extracted or exfoliated caries free primary teeth were included in the study. Class V cavity cavities were prepared in all teeth. Then, teeth were divided randomly into two groups and restored with its respective restorative material following the manufacture’s guidelines., group I (n=22): ACTIVA™, group II (n=22): Fuji II LC. Then, each material was further divided in to two sub groups, sub group A (n=11) where Fluoride release of each restoration was studied during pH-cycling mode on 1st,2nd,7th and 15th day using ion selective fluorine electrode and EDX Analysis was performed before and after the pH cycling to detect Calcium and phosphrous content. Subgroup B (n=11) where enamel fluoride uptake before and after restoration using acid etch biopsies was recorded.
The fluoride release results showed that there is a significant difference in amount of fluoride released during pH cycling where teeth restored with Fuji II LC released a greater amount of fluoride during demineralization and remineralization phases than teeth restored with ACTIVA™. Fluoride uptake results showed a statistically significant difference in the mean %increase in F ion pH cycling in favor of Fuji II LC.
The EDX quantitative results revealed that there is significant difference after pH cycling in mean Ca, P, F and Ca/P between the two study groups. A significant difference was found within group comparison in mean Ca and P ion content after pH cycling in ACTIVA™ group, while Fuji II LC group showed no significant difference.
The null hypothesis was rejected by the current study’s findings since the investigated materials’ fluoride release and uptake, as well as their Ca and P releasing potentials, were statistically significantly different from one another at each time interval.