Zirconia restorations are the ultimate restorative material, offering a combination of strength, durability, biocompatibility and esthetics. Zirconia is harder and stronger than most metals used for crown and bridge procedures. As such, it can be exceptionally difficult to adjust appropriately with standard instrumentation.
For the best results when working with zirconia, you should rely on instruments optimized for the high-strength material. Standard instruments often fail in these cases, requiring the operator to use multiple burs to adjust or polish a single restoration. In turn, if the instrumentation does not achieve a high luster on the restoration, the zirconia will be very unforgiving and antagonistic to the opposing dentition; therefore, a special kit dedicated to high-strength ceramics offers the ideal solution. The kit contains a range of specialized instruments engineered to cut, finish and polish full-contour restorations fabricated of zirconium oxide, lithium disilicate, aluminum oxide and other pressed ceramics.
To re-contour, adjust or finish a zirconia crown, use a custom diamond bur that is uniquely engineered with a permanently bonded, densely packed diamond layer. The coarse-grit diamonds provide an exceptional performance-to-service life ratio, and the medium-grit versions are especially suitable for a wide range of adjustment procedures.
Adjusting occlusal contacts is also frequently required at the time of try-in and/or post-insertion. If there is a minor occlusal adjustment needed, use only a rubber abrasive polishing wheel and not a diamond. A diamond is needed only if there is a significant adjustment to be made. If a diamond is used in this process, proper polishing of the surface is necessary to achieve a smooth surface. A polished ceramic surface is less abrasive than one that is glazed, so there should be no need for re-glazing of the restoration The larger the diameter of the polishing wheel used, the more efficient and effective the process. A point may be necessary to get into the depth of the anatomy, however it is the least effective because of its size.