If the preparation margin location is supragingival for moisture control, what is the recommended method to use?

When the preparation margin is supragingival, which means it is located above the gum line, the recommended method for moisture control is the use of a rubber dam. This method creates a barrier that isolates the treatment area from saliva and moisture in the oral cavity, ensuring a dry working field. A rubber dam is particularly effective for various dental procedures as it minimizes contamination and provides a clear view of the working area, which is essential for achieving optimal results.

In contrast, while other methods like cotton rolls, absorbent cards, and saliva ejectors can help manage moisture, they are generally less effective than a rubber dam. Cotton rolls and absorbent cards can absorb some moisture but may not fully prevent saliva from reaching the preparation area, which can compromise the bonding and overall success of subsequent restorative work. Saliva ejectors can assist in reducing moisture but may not provide the complete isolation that a rubber dam does, making it the preferred choice for procedures where moisture control is critical.