Which of the following is NOT a use for slow-speed handpieces?

The correct answer highlights that "initial access through enamel" is not typically a use for slow-speed handpieces. Slow-speed handpieces are generally employed in procedures that require precision and control, such as finishing and polishing, removing caries, and refining cavity preparations. These tasks benefit from the slow rotational speed, which allows for more careful handling and minimizes the risk of damaging surrounding tissues.

In contrast, initial access through enamel usually requires a high-speed handpiece due to its need for rapid cutting and efficiency. High-speed handpieces utilize a faster rotation that can effectively penetrate hard dental structures like enamel, facilitating the swift access needed for subsequent procedures, such as caries removal or deeper cavity preparation. Thus, while slow-speed handpieces are essential for specific tasks within dentistry, initial access to enamel is best accomplished with the speed and power of high-speed instruments.