Abstract
The lingual extension of a mandibular edentulous impression is the most challenging border to determine accurately. Appropriately extending the mandibular lingual flange to assist in stabilizing a removable denture can be obtained with correct understanding of anatomy and function of the floor of the mouth.1 The lingual flange rests in the alveololingual sulcus, which has an S-shaped curve that extends from the lingual frenum to the premylohyoid fossa and then curves medially from the body of the mandible to the retromylohyoid fossa.
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