Marginal Leakage of Amalgam and Modern Composite Materials Related to Restorative Techniques in Class II Cavity : Comparative Study

Gingival Marginal Leakage of Different Tooth Colored Materials Combination as an Intermediate Layer in Class II Composite Restoration : A Comparative in Vitro Study

“…Many factors influence the degree and adequacy of the polymerization process, such as the type and relative amount of monomers, filler and initiator/catalyst as well as the shade and translucency of the material, its temperature during polymerization, the wavelength and intensity of the incident light, and the irradiation time )23) . Absorption and scatter within the material are the major factors causing light attenuation, rather than reflection from the restoration surface, as this is dependent on the formulation of the material, particularly the filler size, type and content (24) .…”

“…The increasing of the distance from bottom up to the cusp tip makes a serious problem in curing causes the resin composite on the bottom surface and disperses the light of the light curing unit. As a result, when the light passes through the bulk of the composite, the light intensity is reduced and the energy of the light emitted from a light-curing unit decreased drastically when transmitted through resin composite, leading to a gradual decrease in degree of conversion of the resin composite material at increasing distance from the irradiated surface (24) .…”