An Comparative Study on Marginal Microleakage of Filling Materials

objective: to compare the marginal microleakage of three dental filling materials after they are filled in externally in order to sift out higher-density filling materials. Method: select some healthy isolated teeth, clean them thoroughly and prepare holes on each of them, fill in the holes with different filling materials, store them in simulated mouth temperature, use dye penetration test to observe the degree of dye penetrated into the tooth under a microscope and to measure the space between the restorations and tooth structure under a electronmicroscope. Result: dye has leaked into the sides of all the three groups of filling materials to different degrees, silver amalgam capsule>photocureable resin(non-acid)>photocureable resin(acid). The average breadth of the crack between the filling and the teeth is 15.78±11.55 microns for silver amalgam, 12.09±9.13 microns for photocureable resin(non-acid), and 9.61±4.13 microns for photocureable resin(acid).Conclusion: photocureable resin(acid) has the best peripheral density and there is significant difference.