When considering FDPs and stress breakers, which of the following is NOT true?

The statement regarding the tenon equating to the patrix as the male component, typically placed on the distal aspect of the anterior retainer, is not true. In the context of fixed partial dentures (FDPs) and stress breakers, the tenon (or patrix) is generally positioned on the abutment that is intended to receive the connecting assembly. In most frameworks, particularly with stress breakers or flexible connectors, it is more common to find the tenon located on the posterior retainer rather than the anterior one.

This concept is key in ensuring the proper function and stability of FDPs when incorporating non-rigid connectors. Understanding the distinction between the positioning of the tenon and other elements like the mortise—as well as the orientation relative to the path of withdrawal—is critical for achieving optimal retention and preventing deleterious stresses that may compromise the integrity of the prosthesis.

In contrast, the other statements about axial tilt, mortise definitions, and paralleled paths of withdrawal are accurate and reflect accepted principles in prosthodontics. These principles work collectively to enhance the effectiveness of the framework and its durability over time.