What is the suggested cantilever length that can be extended from an implant-supported FDP?

The recommended cantilever length for an implant-supported fixed dental prosthesis (FDP) is important for ensuring the stability and longevity of the restoration. The anterior-posterior spread refers to the distance between the most anterior and posterior implants in the prosthesis, which directly influences both the load distribution and the overall biomechanics of the dental restoration.

The suggested range of 1.25 to 1.75 times the anterior-posterior spread reflects a balanced approach that maximizes function while minimizing potential complications, such as excessive bending forces and stress on the implants. This range is backed by clinical research that has indicated that exceeding this length could lead to problems such as implant overload, which increases the risk of failure.

In contrast, shorter cantilever lengths (like the range seen in the first option) may limit the functional range of the restoration, while overly long cantilever lengths (like those presented in the choices indicating 2.0 to 3.5 times the spread) can lead to biomechanical stresses that are not sustainable. Therefore, 1.25 to 1.75 times the anterior-posterior spread is regarded as the most appropriate and clinically supported guideline for cantilever extension in this context.