Which scaler part is used primarily for scaling and root planing?

The correct response highlights that both curved and straight sickle hand scalers are essential tools in scaling and root planing procedures. These instruments are specifically designed to remove supragingival plaque and calculus, which are major contributors to periodontal disease.

The curved sickle scaler has a design that allows it to adapt well to the contours of the tooth surfaces in areas that require a more delicate approach, particularly in posterior teeth where the curvature can aid in reaching and properly engaging deposits.

The straight sickle scaler, on the other hand, is effective on anterior teeth and for accessing areas with more direct surfaces. Each scaler's design serves to maximize efficiency and comfort during the removal process, ensuring that both supragingival surfaces and, to some extent, subgingival areas are effectively treated.

Overall, the utility of both types of sickle scalers reflects the varying needs in periodontal care and demonstrates the importance of employing the right instrument for the specific anatomical and pathological situations encountered in the oral cavity.