Which class of cavities involves the mesial or distal surface of an incisor or canine tooth?

Cavities that involve the mesial or distal surface of an incisor or canine tooth are classified as Class III cavities. This classification specifically pertains to cavities located on the interproximal surfaces of anterior teeth, which include incisors and canines. These surfaces are typically not visible when the mouth is closed, making early detection and treatment important.

Class III cavities can often develop due to the accumulation of plaque and food particles in the contact area between teeth, leading to caries. Understanding the location of these cavities is crucial for dental professionals, as it guides the approach to treatment and restoration. In contrast, other classes, such as Class I, involve occlusal surfaces, Class II pertains to posterior teeth involving mesial or distal surfaces, and Class IV involves the incisal edge or angle of anterior teeth.