In this paper we propose a virtual drilling algorithm which is applied on 3-D objects. We consider that initial we are provided with a sparse set of parallel and equi-distant slices of a 3-D object. We propose a volumetric interpolation algorithm for recovering the 3-D shape from the given set of slices. This algorithm employs a morphology morphing transform. Drilling is simulated on the resulting volume as a 3-D erosion operation. The proposed technique is applied for virtual drilling of teeth considering various burr shapes as erosion elements.