Basnet, BB2026-01-262026-01-262025https://hdl.handle.net/20.500.14572/4374Basnet BB Department of Prosthodontics and Crown-Bridge BP Koirala Institute of Health Sciences Dharan, NepalABSTRACT Lingual undercuts in the mandibular alveolar ridge pose significant challenges to conventional complete denture fabrication and patient comfort. This case report details the management of a severe oblique lingual undercut using addition silicone to create a blockout, facilitating space for a soft liner. This technique was incorporated during the denture fabrication process, simplifying the chairside relining with soft liner and improving denture seating and retention. By preemptively accommodating the undercut, the procedure minimized patient discomfort and ensured a more stable and comfortable denture, offering an effective alternative to more invasive surgical interventions. KEY WORDS Alveolar bone resorption, Complte denture, Denture retention, Denture stabiltiyen-USAlveolar bone resorptionComplte dentureDenture retentionDenture stabiltiyArticle