Which enamel structure is found at the tips of the cusps?

The correct answer identifies the enamel structure known as cusp tips, which are the elevation points on the edges of the cusps of the teeth. These tips are crucial in occlusion, as they play a significant role in how the upper and lower teeth come together during biting and chewing. The enamel at the cusp tips tends to be thicker than in other areas, which helps to withstand the forces exerted during mastication.

Enamel structures like enamel nodules and enamel spindles represent different types of enamel formations not specifically associated with the cusp tips. Enamel prisms, or enamel rods, are the organizational units of enamel but do not pinpoint a specific location such as the cusp tips. Understanding these structures and their functions helps in recognizing the importance of cusp tips in dental health and occlusion.