الفهرس 
AcknowledgmentOnly 14 pages are availabe for public view
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Abstract
This study was conducted to investigate the effect of food simulating materials on micro-hardness and surface roughness of two resin composites; nanofilled resin composite and microhybrid. Food simulating materials were Heptane simulating( butter , fatty meats , vegetables oils ) , 50% ethanol simulating (certain beverages including, alcohol , vegetables , fruits, candy and syrup) and distilled water as a control. Aging was done as follow one day , after one month and three months.