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# Lingual Rests (Cingulum Rest) Lingual rests are associated with anterior teeth. The preferred rest is the occlusal rest of a molar or a premolar, but an anterior tooth may be the only abutment available for occlusal support of the denture. Also, an anterior tooth may be used as an indirect retain...

# Lingual Rests (Cingulum Rest) Lingual rests are associated with anterior teeth. The preferred rest is the occlusal rest of a molar or a premolar, but an anterior tooth may be the only abutment available for occlusal support of the denture. Also, an anterior tooth may be used as an indirect retainer or an auxiliary rest. A canine is much preferred over an incisor for this purpose. When a canine is not present, multiple rests over several incisor teeth are preferable. The preparation of an anterior tooth to receive a lingual rest is accomplished in two ways: **First method:** A slightly rounded V-shaped preparation on the lingual surface at the junction of the gingival and the middle one-third of the tooth. The apex of the V is directed incisally. Meso-distal length of preparation should be a minimum of 2.5 to 3 mm, labio-lingual width about 2 mm, and incisal-apical depth a minimum of 1.5 mm. This preparation of the tooth starts with an inverted cone-shaped bur and progresses to a smaller tapered bur with a round end to complete the preparation. **Diagram:** The diagram shows three views of a lingual rest seat prepared in the enamel of a maxillary canine. The views show the preparation from different angles, illustrating the V-shape prepared on the lingual surface of the tooth. Measurements are also shown: * 2.5-3 mm for mesio-distal length * 2 mm for labio-lingual width * 1.5 mm for incisal-apical depth