When deep gingival extension of proximal box is anticipated, which  of the following is used?
Round toothpick wedge
Triangular wedge
Elliot’s separator
Kesling separator
To protect the gingiva and the rubber dam when extending the gingival wall apically, a wooden wedge should already be in place in the gingival embrasure to depress soft tissue and the rubber dam. A round toothpick wedge is preferred unless a deep gingival extension is anticipated. A triangular (i.e., anatomic) wedge is more appropriate for deep gingival extensions because the greatest cross-sectional dimension of the wedge is at its base; as the gingival wall is cut, the bur’s end corner may shave the wedge slightly.