Which of the following describes a Class II cavity preparation?

A Class II cavity preparation specifically involves the proximal surfaces of posterior teeth, which includes the sides of the teeth that are adjacent to each other. These cavities typically occur in molars and premolars, where decay can occur between teeth due to plaque accumulation and difficulty in cleaning these areas effectively.

In contrast, the other options describe different types of cavity preparations. The reference to the occlusal surface only pertains to Class I cavities, which are found solely on the biting surfaces of teeth. The mention of incisal edges relates to Class IV cavities, where the cavity affects the incisal edge of anterior teeth due to caries or trauma. The option about the root surface describes Class V cavities, which are typically found at the gum line. Each of these classes of cavities has distinct characteristics and locations that are essential to understand in dental practice.