What impact does slower rotation of the polishing cup have on abrasion?

Slower rotation of the polishing cup decreases the amount of abrasion because the speed at which a polishing instrument operates directly affects how aggressively it interacts with the surface being polished. When the rotation is slower, the friction generated between the polishing cup and the surface is reduced. This lower friction means that the abrasive particles in the polishing cup are less effective at removing material from the surface.

In dental procedures, the aim of polishing is to enhance the appearance of a surface, such as a tooth or dental restoration, while minimizing the removal of material that could compromise its integrity. Therefore, a slower rotation not only reduces the abrasion but also helps in achieving a smoother finish without damaging the surface underneath.

The other potential effects such as uneven polishing or having no effect do not apply since a slower rotation generally does lead to a more controlled and less aggressive polishing action, preventing damage and allowing for a more uniform surface finish.