Which of the following is NOT a method for performing dual impression technique?

The choice indicating "Direct impression with only one material" is not a method for performing the dual impression technique because the dual impression technique specifically involves capturing the optimal tissue contours and the relationship of the supportive structures using two different materials or techniques. The first impression typically uses a material that accurately captures the soft tissues, while the second impression often uses a more rigid material to record the final fit of the denture base on the supporting structures.

In contrast, methods such as functional relines at RPD placement, altered/corrected cast impressions, and using a combination of materials all align with the principles of the dual impression technique. These methods are designed to accommodate the functional movements and changes that occur in the oral cavity, thereby providing better retention and stability for the removable partial denture. Using only one material would not allow for the necessary adaptability and accuracy that the dual impression technique aims to achieve.