Tooth impaction is caused by systematic or local etiologic factors such as cysts, odontogenic tumors, supernumerary teeth, delayed tooth development and gingival fibrosis. There are few cases of impaction of deciduous teeth.
Recently, we encountered a case of impacted teeth of the mandibular right second primary molar in a 7-year-old boy. Radiographic examination revealed that the mandibular right second primary molar was impacted, and there were not any abnormal findings such as cysts or odontomas around the tooth.
Under regional anesthesia, the tooth was extracted. Histopathological examination of the soft tissue over the impacted tooth showed that the cause of impaction was suspected to be of hyperplasia of the collagen fiber at the submucosal layer.
After 2 years and 7 months of surgical treatment, the second premolar tooth tends to be erupting.
