A 45 year old male presents to the dental clinic with black spot. He also gives the history of previous dental treatments of other teeth and wants gold to be filled in this tooth. On examination, it is revealed that 16 no. tooth has pit and fissure caries. During the condensation of the restorative material, the compacted surface should be:
Generally the line of force is perpendicular to the pulpal ﬂoor in the center of the mass and at a 45-degree angle to the pulpal ﬂoor as the external walls are reached. At this stage and during all building of the restoration, the compacted surface should be saucer-shaped, with the compaction of gold on the external walls slightly ahead of the center. 
The surface should never be convex in the center because this may result in voids in the gold and poor adaptation of the gold along the external walls when the condenser nib is “crowded out” along the wall by the center convexity. 
The operator continues building the restoration until the cavosurface margin is covered with foil. One needs to exercise extreme care that gold is always present between the condenser face and the cavosurface margin; otherwise, the condenser may injure (i.e., fracture) the enamel margin.
The central area of the restoration surface is ﬁlled into the desired level. Tooth surface contour of the gold is created to simulate the ﬁnal anatomic form, and a slight excess of gold is compacted on the surface to allow for the ﬁnishing and polishing procedures.

 
Sturdevant operative dentistry  7th E D I T I O N, Page No:131
Saucer shaped, with the compaction on the external walls slightly ahead of the center
Convex in the center with the compaction on the external walls slightly ahead of the center
Flat in the center with the compaction on the external walls slightly ahead of the center
Flat throughout the floor