2-      40-nm silica

2- ≤100-nm nanoparticles

·         Smooth surfaces

·         Anterior aesthetic

w.r.t (2) (Classes III, IV)

·         Highest aesthetic level

·         Better wear properties than any other

·         High luster and hold their polish over time

·         Stain and plaque resistant

·         Highest reflective and refractive indices hence more realistic translucency

·         Higher strength can be used as substructure under microfills enamel layer.

·          Most Opaque of the 3 composite types, also great for masking out unwanted color and achieving extreme color changes.

·         better surface smoothness

·          lifelike opacious translucency

·         Dec. water sorption

·         More difficult to marginate, and will wear faster than microfill resins.

·         More susceptible to plaque and staining over time.

·         Less biological compatible with gingival tissues

·         Can be used to fill the bulk of the tooth

·         veneering manidbular anteriors

·          building up incisal edges

·          class IV restoration

·          increasing cuspid rise

·         when the doctor wants to use only one material