This inflammatory cyst originated from a reaction to dental pulp necrosis.

The malformation shows a broad spectrum of morphologic variations and frequently results in early pulp necrosis.

Due to lack of intrapulpal pressure in an open lesion pulp necrosis does not take place as would have occurred in a closed caries case.

The sequelae of dental trauma can be serious and can involve pulp necrosis, requiring root canal treatment or tooth extraction.

Tooth decay may cause pulpitis (toothache) to occur in the same region, and this may cause pulp necrosis and the formation of a periapical abscess associated with either tooth.

This is not only to slow the progress of the attack, but also to prevent the diffusion of bacteria and their metabolites into the pulp, reducing the probability of partial pulp necrosis.

Indeed, most of the common oral pathologies have been reported as possible sources of barodontalgia: dental caries, defective tooth restoration, pulpitis, pulp necrosis, apical periodontitis, periodontal pockets, impacted teeth, and mucous retention cysts.