What preparation guidelines need to be observed? (Ceramir CAD/CAM)

Prepare margin with chamfer or rounded shoulder preparation. For inlays/onlays all internal edges and angles should be rounded. Avoid margins in direct occlusal contact with opposing tooth.

Minimal thickness of the restoration should be 1,5 mm in pit and fissure areas as well as in cusp areas.

For veneers minimal wall thickness is 0,5 mm and it can be reduced down to 0,3 mm in the cervical area.