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Eruption cysts: retrospective clinical study of 36 cases.

The eruption cyst is a lesion associated with an erupting tooth. It appears as a transparent, bluish, blue or blue-black swelling of the alveolar mucosa, over a temporal or permanent tooth in eruption. The analysis of the thirty-six eruption cysts cases studied, corresponding to twenty-seven patients, revealed that their most frequent location is in the maxillary permanent dentition, and that they mostly occur in a single presentation, and in an age-range of between five and nine years. Six cases out of the twenty-seven patients studied showed the characteristic of presenting two or more eruption cysts, and in three of these cases, the lesions were bilateral, symmetrical and simultaneous. Two other patients had been previously diagnosed with cyst diseases. This would suggest that, in addition to the possible infection-trauma origin, there is in some cases the possibility of a predisponent tendency.