<prompt> The secondary flare is necessary for class II cast gold inlay preparation for several reasons, but basically the direction of the flare results in:Good aesthetics60 marginal metal which is burnishable40 marginal metal which is burnishable10 marginal metal which is burnishable  <response>: Secondary flare:It is a flat plane superimposed peripherally to the primary flare. Advantages are:Secondary flare ensures cavosurface margins to extend into embrasures self-cleansing area.Permits easy burnishing and finishing of the restoration.Produces more obtuse-angled and stronger cavosurface margin.In class II cast gold inlay, proximal box should have flares so as to have the metal of 30-40 which is burnishable. 