Which isolation technique uses material to keep the area dry during procedures?

The use of isolation techniques in dentistry is crucial for maintaining a dry working environment during procedures. Each of the methods listed—dental dams, cotton rolls, and dry angles—serves the primary purpose of isolating the treatment area from saliva and moisture.

A dental dam is a thin, flexible sheet that creates a barrier around the tooth being treated. It effectively isolates the tooth and keeps it dry, minimizing contamination during procedures like fillings and root canals.

Cotton rolls are used to absorb saliva and can be positioned in the mouth to help keep the area dry. They are especially useful in procedures that do not require full isolation, as they can be easily placed and removed.

Dry angles, on the other hand, are triangular absorbent pads placed in the vestibule of the mouth. They are designed to absorb moisture from salivary glands, providing another layer of isolation and helping maintain a dry field.

Since all three techniques contribute to keeping the treatment area dry during dental procedures, the answer correctly identifies that each method is valuable in achieving this goal. Thus, the correct response encompasses all of these methods collectively.