الفهرس 
Fluoride release and uptake characteristics and shear punch strength for glass ionomers reinforced by zinc
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Abstract
This study was carried on to measure and compare the rate of Fluoride release from zinc reinforced glass ionomer cement and conventional one at different time intervals namely; one week, and one month, measure and compare the amount of Fluoride and Zinc uptake by dentin at the same selected time intervals and to investigate whether leaching out of Fluoride and Zinc from zinc reinforced glass ionomer cement could affect its shear punch strength at the aforementioned time intervals or not. Fluoride release measurement was done using a specially constructed split teflon mold to prepare the specimens. The mold was 2mm thick and has a 3 circular holes with internal diameter of 3mm. Twenty specimens were prepared, they were divided to two equal groups according to the type of the restorative material used (A), ten discs for each tested group; in the first group (A1) conventional glass ionomer material (Chemfil Molar) was used, in the second group (A2) zinc reinforced glass ionomer material (Chemfil Rock) was used. For each group, the cumulative amount of Fluoride release was assessed; at first day, one week, two weeks, 3 weeks, and four weeks using an ion analyzer