Lingual plate

A Lingual plate is a type of mandibular major connector that is used in a removable partial denture in the field of dentistry. It is similar to the lingual bar but the superior border extends up to the cingulum of the lingual surface of the teeth. Chrome metal is used because it is very rigid in thin dimensions. Superior border is scalloped and has an intimate contact with the teeth. This produces a knife edged margin. In cases with large embrasures and spacing, the superior border is made to dip down so that it is not visible externally (Step back design). Anteriorly, the lingual plate should be supported by rests (described later) located on mesial fossa of the first premolars of either side (Fif indirect retention is required.

Indications

1. Depth of lingual vestibule is less than 7mm
2. Additional loss of teeth is anticipated
3. Presence of a torus mandibularis
4. All posterior teeth are to be replaced bilaterally

Contraindications

1. Higher food impaction
2. More tissue contact
3. Higher plaque accumulation

It is important to note that a lingual bar would be used in cases that are completely opposite to indications mentioned above.

Advantages

• Most rigid and stable.
• Provides indirect retention when rests are provided on the premolars.
• Additional tooth replacements can be easily added.

Disadvantages

• Decalcification of tooth structure due to food and plaque accumulation.
• Irritation of oral mucosa.

See also

• Palatal strap