What aspect of RPD design helps to minimize the risk of soft tissue irritation?

The correct choice emphasizes the importance of proper contours and smooth transitions in the design of a removable partial denture (RPD). This aspect directly affects how the denture interfaces with the surrounding soft tissues in the mouth. When the contours of the denture are well-designed and transitions between different components are smooth, the likelihood of soft tissue irritation is significantly reduced.

Rough surfaces or sharp edges on the denture can create areas of stress and pressure on the soft tissues, leading to discomfort, inflammation, or ulceration. Conversely, a denture with well-rounded contours distributes forces more evenly, promoting comfort and health of the oral mucosa. Features such as rounded borders and gradual transitions allow the denture to fit snugly without causing friction or irritation against the sensitive tissues in the mouth.

While retaining features, rough textures, and metal components may contribute to other functional attributes of the RPD, they do not specifically address the minimization of irritation to the soft tissues as effectively as smooth and properly contoured designs. A well-crafted RPD will enhance comfort and wearability, ultimately optimizing patient satisfaction and denture functionality.