<prompt> The lower denture bearing area has different compressibility. Which is the most compressible tissue in lower arch?Buccal shelfPremylohyoid regionLabial sulcusRetromolar pad  <response>: Buccal shelf area is a stress bearing area, however it is not compressible.Retromolar pad has glandular tissues, loose areolar connective tissue and muscle fibres. It is more compressible but has no underlying compact bone.ANATOMICAL LANDMARKS IN THE MANDIBLEThey can be broadly grouped into:Limiting structuresLabial frenumLabial vestibuleBuccal frenumBuccal vestibuleLingual frenumAlveololingual sulcusRetromolar padsPterygomandibular raphe.Supporting structuresBuccal shelf areaResidual alveolar ridge.Relief areasCrest of the residual alveolar ridgeMental foramenGenial tuberclesTorus mandibularis. 