What is the term for a fissure between the cusps on the crown of a tooth?

The term for a fissure between the cusps on the crown of a tooth is known as a developmental groove. Developmental grooves are essential features of a tooth's anatomy, formed during the developmental phase when the tooth is being brought into its final shape. These grooves mark the junction where the lobes of the tooth have fused and can often serve as anatomical landmarks for the dentist.

Understanding developmental grooves is significant in dentistry, as they play a role in the occlusion (how teeth come together) and can be sites where dental caries may develop due to the accumulation of plaque and food particles. Recognizing the nuances of tooth anatomy, including these grooves, allows for better diagnosis and treatment planning.