<![CDATA[The problem often found in patients wearing a complete denture with a flat ridge condition is the lack of retention and stabili-ty, which interferes with masticatory function. These conditions can be overcome not only in the moulding process, but also in determining the occlusion concept during tooth preparation. To overcome this problem, the concept of lingualised occlusion is a solution and is expected to improve retention, stability and better support in flat ridge cases. This article reports the concept of lingualised occlusion in denture preparation in the case of a patient with mandibular posterior flat ridge. A 62-year-old woman came to the Department of Prosthodontics of RSGM Unhas with complaints of difficulty chewing food due to the loss of all her teeth. The patient had used a denture but now felt loose and wanted to make a new denture so she could chew well. It was concluded that the concept of occlusion in patients with flat ridge uses the concept of lingualised occlusion which can im-prove retention, denture stability, and patient mastication efficiency.]]>
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