What is the primary function of the lateral edge in hand scalers?

The primary function of the lateral edge in hand scalers is to cut calculus. Hand scalers are specialized instruments designed for the removal of supragingival calculus, and their lateral edges are specifically shaped to provide an effective cutting surface. When the scaler is applied against the tooth surface, the sharp edges engage with the calculus deposits, allowing for efficient removal during instrumentation.

The geometry of the scaler, including the angling and contouring of the lateral edges, contributes to the effectiveness of the cutting action. Maintaining the proper angle and applying appropriate force enhances the effectiveness of calculus removal, making the lateral edge an essential feature of the hand scaler's design.

In this context, while other aspects such as strength and support are relevant to the overall construction of the scaler, they do not directly pertain to the specific function of cutting calculus, which is the primary intent during periodontal treatment.