Which classification of caries includes decay on the proximal surfaces of posterior teeth?

The classification of caries that includes decay on the proximal surfaces of posterior teeth is Class II. This classification is part of G.V. Black's caries classification system, which categorizes carious lesions based on their location on the teeth. Class II specifically pertains to decay that occurs on the mesial or distal surfaces of posterior teeth, such as molars and premolars. This is significant because anterior teeth, which include incisors and canines, have different classifications for caries that involve their proximal surfaces.

Understanding this classification helps dental professionals diagnose, treat, and communicate about carious lesions effectively. By identifying caries based on their location, dental nurses and dentists can plan appropriate restorative treatments, ensuring that they address the specific areas affected by decay. This is crucial for maintaining the overall health of the teeth and preventing further complications.