COMPARISON OF DIFFERENT RESIN-MODIFIED GLASS IONOMER CEMENTS OF WATER SORPTION AND MICROLEAKAGE VALUES USED IN

Purpose: the purpose of this in vitro study was to evaluate the amount of water sorption and microleakage of resin-modified glass ionomer cements used in the treatment of primary teeth. material and methods: for evaluate scores of microleakage of 4 different materials were used noncarious 60 extracted primary molar teeth. teeth were randomly divided into 4 groups (n=15). standard class ii preparations (3x3x2 mm3) were made in mesial and distal surfaces. all cavities were restored using one of four material (photac–fil quick, ionolux, fuji ii lc and riva). after all teeth were subjected to thermocycling for 250 cycles, teeth were cut mesio-distal direction from the center of the restoration and scores of microleakage were determined using a microscope. for evaluate water sorption of materials were prepared 10 specimens of each material with 5 mm diameter and 2 mm thick. these specimens were stored in a desiccator for 1 hour at 23 ± 2º c and then 24 hours 37±1º and the weight of each sample was measured by sensitive balance. the specimens were stored in an incubator which contains distilled water at 37 ± 1º c’ for one week. then the specimens were weighed again. data were analyzed statistically by analysis of variance and tukey hsd test.results: gingival leakage of photac-fil quick and riva specimens were found to be statistically higher than in other materials (p<0.05). riva showed the highest water sorption value after 7 days (p<0.05). conclusion: if the resin-modified glass ionomer cement can use in the treatment of primary teeth, the use of fuji ii lc with the lowest values of water sorption and microleakage may be prefer.