CLASS II PREPARATION CHECK LIST

1. Rubber dam placed and old restoration removed.

2. Check for decay and remove; check for cracks under cusps.

3. Line dentin with calcium hydroxide and place chemical cured composite as 'block-out' material.

4. Form occlusal which includes proper depth, even draw to walls in all directions, smooth flat pulpal floor and extension past contact area of adjacent tooth or teeth.

5. Drop mesial proximal box to proper depth gingivally and axially, smooth flat gingival floor and draw to axial wall. Axial depth of two surface preparation at gingival is 1.2 to 1.5 mm deep. Axial depth of three surface preparation at gingival is .8 to 1mm deep.

6. Upright bur in long axis of tooth, lean bur toward buccal and flare diagonally to connect with cut of the occlusal outline. Proximal wall should be of one plane. Mesial buccal wall is most esthetic when kept parallel to the contour of the adjacent teeth.

7. Upright bur in long axis of tooth, lean bur toward lingual and flare diagonally to connect with cut of the occlusal outline. Proximal walls should be of one plane.

8. Drop distal proximal box to proper depth gingivally and axially, smooth flat gingival floor and draw to axial wall. Axial depth of two surface preparation at gingival is 1.2 to 1.5 mm deep. Axial depth of three surface preparation at gingival is .8 to 1mm deep.

9. Upright bur in long axis of tooth, lean bur toward buccal and then lingual and flare diagonally to connect with cut of the occlusal outline. Distal proximal box must draw with the mesial proximal box and distal axial wall must draw with mesial axial wall. Proximal walls must be straight and of one plane. At this stage all vertical walls should be smooth and draw in all dimensions. All floors should be flat and smooth.

10. Use off-angle chisel to form proximal axial line angles and plane proximal cavosurfaces.

11. For two surface preparations, use regular gingival margin trimmers to form about a 30 degree internal bevel - an acute axial gingival line angle.

12. Use off-angle chisels to form the other half of the axial proximal line angles, smooth axial walls and crisp and sharpen axial gingival line angles, proximal axial lines and gingival proximal axial point angles.

13. Use Tucker gingival margin trimmer to form a 60 degree external bevel of even width - approximate width of .5 to .75mm.

14. Crisp and sharpen all line and point angles with a sharp G-5 explorer.

15. A slight occlusal cavosurface bevel is placed in areas where unsupported enamel rods exist and a smooth flowing cavosurface outline is desired.

16. The preparation is checked for adequate retention and resistance form. If not, pin(s), slots, pots and/or bales are placed to enhance resistance and retention. Pots or Tucker pits should only be place in composite 'block-out'.

17. A weak cusp or cusps are now reduced for coverage and support.

18. At this point the preparation is completed, if each step along the way is done the best that it can be.