Improvement on dental composite using supra-nano eggshell particles

To improve the microstructure of dental composite resin, the waste chicken eggshell particles with white color were incorporated in it, by the weight ratios 2.5% and 5%. Egg shells, which are a natural source of calcium that mainly involved in the formation of bones and teeth, were used as an additive to strengthen dental composite against external stresses. The main mechanical test represented by hardness, wear resistance and compression strength. The addition of supra nanoparticles eggshell with particles size (300 nm) by weight ratio 2.5% to dental composite resin, significantly improves all of its mechanical properties, in addition to the increase the value of the its glass transition temperature from 58 oC to 75 oC, which rises by the ratio (∼ 36%). Electron microscope images were used to observe the degree of homogeneity in dental composite microstructure, which interpretation all the results that are improved mechanically and thermally.