There is nothing better than a patient’s own tooth structure, so we must be cognoscente of how much healthy tooth structure is removed when we place indirect restorations. Thankfully, materials have drastically improved over the years and minimally invasive partial coverage dentistry is a reality.
Numerous studies demonstrate that occlusal thickness of lithium disilicate restorations can be as little as 1 mm, as long as the restoration is properly bonded in place. In addition, it is very important that no sharp angles are present and that the preparation has a more rounded form so excess stress is not placed on the restoration.
One of the more challenging areas to achieve ideal form is the occlusal table. Preparation of the occlusal table is a balance between minimizing tooth reduction while also providing enough room for the ceramist to create ideal anatomy and allow for side shift in the central fossa. The new OccluShaper burs (370.FG.030 and 370.FG.035) from Komet USA focus on this balance.
The bur is bulbous in the middle and tapers at the ends, so the central groove can be prepared in a way that allows for a wide occlusal table yet tapers as it approaches the cusp tips. This change in shape allows cusps to be prepared in a convex fashion for cusp support. In the past, a football or barrel shaped bur may have been used in these areas. However, the football bur does not properly shape the cusp tips and a barrel shaped bur has sharp angles, which are contraindicated with ceramic dentistry. This makes the OccluShaper burs a better option.
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