What is the area on crown surfaces of a tooth formed by a line drawn between two surfaces called?

The area on crown surfaces of a tooth formed by a line drawn between two surfaces is called a line angle. This term is used to describe the junction or intersection of two surfaces that create an angle, influencing the tooth's shape and function. Line angles are essential in dental anatomy as they contribute to the overall form of the tooth and provide guidance in various dental procedures, including cavity preparation, restoration, and prosthetic design.

In understanding the significance of line angles, it's also important to recognize other anatomical terms like fossa, cusp, and margin, which refer to different features of the tooth. Fossa pertains to a depression or pit on the tooth surface, while a cusp refers to the pointed or elevated parts of the tooth used for grinding food. The term margin generally describes the edge or boundary of a structure. Each of these terms has its specific role in dental anatomy, but they do not adequately describe the area formed by a line drawn between two surfaces as a line angle does.