Which of the following is NOT a function of cross-cut fissured burs?

Cross-cut fissured burs are specifically designed burs that have a unique cutting design, allowing them to perform several important functions in dental procedures. One primary function is to increase cutting efficiency due to their structured tip and multiple cutting edges, which enable faster and effective removal of dental hard tissues. They are particularly adept at cutting through both dentin and enamel, making them valuable tools in cavity preparation and for shaping tooth structures.

However, their design is not suited for planing the tooth surface. While cross-cut burs effectively remove material, they typically produce a rougher finish on the surface rather than a smooth plane. Tasks such as planing require finisher or smoother instruments that create a polished surface devoid of grooves or ridges.

In relation to removing old restorations, cross-cut fissured burs can be effective due to their cutting efficiency and ability to penetrate restorative materials. This aligns with their typical applications in a dental practice.