Use of a permanent soft denture liner in the retromylohyoid eminence and knife-edge ridge areas of the mandible to aid in retention and stability.

: Many edentulous patients who wear complete dentures have alveolar ridge resorption. While retention is a concern in both arches, the mandibular arch presents more of a challenge due to less available bone. Mini-implants may not be an option in a case with knife-edge ridges. Lingual undercuts in the posterior mandibular region of the retromylohyoid eminence can be used to increase retention. A permanent soft denture liner is ideal for this application. It is softer than the acrylic denture material that is typically utilized, thus there is less discomfort when the patient inserts or removes the denture. A literature search indicates underutilization or lack of knowledge of this technique. This article presents a case involving a patient who could not tolerate traditional dentures. A silicone-based permanent soft denture liner was placed over the knife-edge ridge and retromylohyoid areas of the mandible.