Often if your proximal gingival cavosurface margin is irregular and you wish to preserve every bit of healthy tooth structure in this region, the sectional matrix does not always adapt evenly to this topography. The DME wedge from #Rhondium works a treat to both lift the margin to a workable level and even out the interproximal margin irregularity in one shot.
Restorative: Kerr Simplishade Medium
