The retromolar space or retromolar gap is a space at the rear of a mandible, between the back of the last molar and the anterior edge of the ascending ramus where it crosses the alveolar margin.
Retromolar gap is found in some Neandertals because they had midfacial prognathism. This caused the lower toothrow to move forward, which led to the retromolar gap.
The pear shaped pad is a triangular shaped area of keratinized tissue that forms from the scarring after removal of the most distal molar. The retro molar pad is a non keratinized area of tissue and is a posterior continuation/extension of the pear shaped pad. It is a small inclination going up and posteriorly and is bordered by muscles in the back of the jaw. The denture base should only extend 1/2 to 2/3 up the retro molar pad.