Abstract
We occasionally encounter patients with submerged deciduous teeth in the clinical practice of pediatric dentistry. The incidence of this disorder ranges from 1% to 10%. Here we report a case of patient with 6 submerged teeth involving both the upper and lower dentition. The patient was Japanese boy 14 years,2 months of age.
1. The mother of the patient reported no history of abnormalities including diseases and trauma during the gestational period.
2. The patient showed Angle's class II division 2 in the posterior region, marked deep overbite in the anterior region, and open bite in the premolar region.
3. Dental radiography revealed that among the submerged deciduous teeth, the major portion of the crown of the lower first and second deciduous molars on the right side and the lower second deciduous molar on the left side and the upper second deciduous molars on the right side had erupted from the alveolar bone, but the bilateral upper first deciduous molars were situated even lower. Root resorption was confirmed in all of the submerged deciduous teeth. Displacement of the lower premolars was also noted.
4. With lateral roentgenographic cephalometry, ANB showed a skeletal class 1 jaw relationship, and the mandible demonstrated a low angle, indicating counter clockwise rotation of the mandible.
5. On histopathological examination, bone formation was noted in contact with the resorption cavity of the residual crowns, indicating bony ankylosis.
