Cingulum (tooth)

In dentistry, the cingulum (Latin: girdle) is an anatomical feature of the tooth and refers to the small raised area of anterior teeth, which includes the central incisors, lateral incisors and canines. It makes up the bulk of the tooth near the gum line and is located at the back of the tooth (on the side closest to the tongue). The convexity of the cingulum from one side of the tooth to the other side resembles a girdle circling the back of the tooth at the cervical third of the anatomical crown. The cingulum represents the developmental lobes at the back of the teeth.

The tooth crown develops from primary growth centres known as developmental lobes. Normal teeth generally consist of three to five lobes. In anterior teeth, the front side of the teeth generally develop from three lobes known as the facial lobes, while the back side of the teeth develops from one lobe known as the lingual lobe. The cingulum develops from the lingual lobe. As the tooth matures over time, the cingulum eventually becomes more defined, which contributes to its overall shape and function.

Originally, the cingulum’s main function was to provide protection for the gingiva (gums) in early mammals. Later on, as teeth evolved, the cingulum was formed as a structural reinforcement to provide support to the tooth and spread the force generated from the incisal or cuspal edge throughout the tooth during chewing or by asymmetrical loads placed on the tooth. This is because it greatly reduces tensile strains in the enamel caused by forces. The size and shape of the cingulum has an effect on the amount of strain the tooth is able to withhold. It also plays a role in directing food during chewing.