The overall esthetic result of an all-ceramic restoration is influenced by several factors:
• the shade of the preparation
• the shade of the restoration (ingot/block or layering material)
• the shade of the cementation material
Shade Determination of the Natural Tooth
After tooth cleaning, the shade of the non-prepared tooth and/or the adjacent teeth is determined with the help of a shade guide. Individual characteristics should also be taken into consideration. During the fabrication of highly esthetic restorations, the influence of the preparation shade on the final result is a key factor. For that reason, the shade of the preparation should be carefully determined in order to select the suitable restorative material. This is of utmost importance when dealing with severely discolored preparations. Only if the dentist determines the shade of the preparation and subsequently communicates it to the laboratory may the desired esthetics be achieved in a targeted fashion.
Die Shade Selection
In order to facilitate the proper reproduction of the desired tooth shade, the shade of the preparation should be determined with the help of an IPS Natural Die Material shade guide. This guide enables the technician to fabricate a model die similar to the preparation of the patient, on the basis of which the correct shade and brightness values of the all-ceramic restoration may be selected.