An RPD clasp that is positioned cervical to the height of contour is known as what?

The correct answer is that an RPD clasp positioned cervical to the height of contour is referred to as a retentive clasp. In removable partial dentures (RPD), the design and placement of clasps are crucial for their stability and retention.

A retentive clasp is designed to engage the undercut area of a tooth, which helps to resist dislodging forces when the RPD is in place. This positioning is strategic because the undercut creates a mechanical retention that contributes to the overall stability of the prosthesis. When the clasp is placed cervical to the height of contour, it effectively captures the undercut and ensures that the denture remains securely in place during functional use.

Understanding the role of a retentive clasp is fundamental for dental professionals in making clinical decisions regarding RPD designs and ensuring patient satisfaction with their prosthetic appliances. The positioning and design of these clasps are essential components that affect the performance and comfort of the RPD.