BASIC SET UP: ACERO MOLAR KIT, KETAC CEMENT, MIXING PAD, SPATULA, HOWE PLIER, CRIMPERS.
HOWE PLIER USED TO FLATTEN INTERPROXIMAL SURFACE (IF NECESSARY).
CRIMPERS TO MODIFY CROWN MARGINS FOR SNUGGER FIT (IF NECESSARY).
KETAC FILLED CROWN READY TO BE CEMENTED.
1. REDUCE THE OCCLUSAL HEIGHT
Using a tapered fissure bur, produce pilot or guide cuts. Connect the cuts and thus create a uniform occlusal reduction of 1.5 mm. This should reflect the shape of the original tooth.
2. REDUCE MESIAL & DISTAL
Slice directly through the proximal surface. Starting from the buccal surface, reduce or eliminate the contact without creating a ledge in the proximal space and/or damaging the approximating tooth. Switch to the distal surface and perform the same procedure. The margin should be knife edge With no ledges and approximately 1.0 mm subgingival. Little or no reduction is required for the buccal and lingual surfaces.
3. REMOVE ALL EXISTING CARIES
4. SMOOTH ALL LINE ANGLES
When multiple adjacent teeth are being prepared, greater interproximal reduction is required for easier crown placement. Through a perioprobe or other explorer slide through the proximal surface to ensure there is no contact. Preparation should be occlusally square.
5. CRIMP & CONTOUR
Crimping and contouring involves bending the gingival one-third of the crown's margins inward to establish a tight marginal fit and adaptation.
6. CEMENT CROWN
Dry the tooth and crown. Fill the crown approximately two-thirds full with glass ionomer so that excess cement will flow out from the margins preventing any voids. Spray off excess cement with air and water. An explorer can be used to check for and remove any residual cement along with a knotted floss for interproximal areas. Seat crown completely.