What is the defining characteristic of GV Black's Class II?

The defining characteristic of GV Black's Class II cavity preparations pertains to the involvement of 2 to 4 surfaces of the posterior teeth, specifically including an interproximal surface. Class II cavities are found on the proximal surfaces of molars and premolars, which means they are positioned between adjacent teeth and often require access from the occlusal surface.

This classification is important because it helps dental professionals identify the extent and location of decay, which will influence the treatment plan. A Class II restoration is typically more complex than Class I, as it requires skill to ensure accurate shaping of the cavity while preserving tooth structure. The presence of interproximal involvement indicates not only where the decay is located but also emphasizes the need for careful restoration to restore function and aesthetics effectively.

Understanding the various classifications of cavities is essential for expanded duty dental assistants, as it affects the preparation and materials used in restorative procedures.