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    How to achieve ideal preparations for successful all-ceramic crown restorations

    Komet® instrument kits LD1316 and LD1487 have tools that are conveniently arranged in a Komet® stainless-steel bur block to simplify access, selection and post-use instrument processing.


    Fig. 1. Create a stump with a 4-to-6-degree cone. Round off all transitions within the preparation to prevent potentially damaging tension beneath the restorative material.

    Fig. 2. If the position of the tooth requires no correction, reduce the outer contour of the crown by 1.5 mm, the occlusal surface by 1.5-2.0 mm and the margin by at least 1 mm without mimicking the crown equator. To ensure an optimal fit of the all-ceramic crown restoration, take care to eliminate all sharp edges and corners.

    Fig. 3. Make certain the preparation limit has a width of at least 1.0 mm.

    Fig. 4. Create a shoulder preparation with rounded interior angles (Kit LD1386) or a distinct chamfer preparation (Kit LD1487). Rework the preparation margin with finishing instruments of matching shape (with red-ring identifier).

    Technique: How to create optimal root-canal access using Komet specialty instruments

    Fig. 5. Avoid tangential, spring-edge or lip preparations.

    Fig. 6. For occlusal depth marking, use instrument 843KRA, which features a 2-mm-long working end and a short shank.

    Fig. 7. Employ a silicone index to verify that sufficient substance has been removed.

    Fig. 8. Round off all sharp edges and corners to complete the preparation for an all-ceramic crown restoration.

    For more information on the Komet® LD1316 modified-shoulder prep kit and the LD1487 chamfer-prep kit, contact Komet USA LLC at 888-566-3887 or visit the company website at www.kometusa.com.

    More from Komet: Maximize efficiency by using Komet® stainless-steel bur blocks during instrument reprocessing


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