Extreme distal movement of the unerupted mandibular premolar below the coronoid process: Report of a case.

DOI 8 Citations 12 References
  • TAKEMURA Hitomi
    Department of Oral and Maxillofacial Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health
  • HIRANO Yoshiko
    Department of Oral and Maxillofacial Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health
  • KOHARA Hiroshi
    Department of Oral and Maxillofacial Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health
  • NISHIO Juntaro
    Department of Oral and Maxillofacial Surgery, Osaka Medical Center and Research Institute for Maternal and Child Health

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  • 未萌出下顎小臼歯が筋突起下方まで移助した１例

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Abstract

Occasionally an unerupted tooth moves to a location that is some distance from the site from which it arose. This is often caused by the force of a tumor or a cyst, but sometimes the mechanism of the movement cannot be identified. We report the case of a 15-yearold girl in whom an unerupted mandibular first premolar moved below the coronoid process because of no apparent cause. A dental radiograph taken at the age of 9 years showed that the tooth germ of 7 was located in normal position and it appeared to be erupting. However, a panoramic tomogram taken at the age of 12 years showed that F4 was located in a horizontal position below the second molar. The unerupted first premolar continued distal movement, and 3 years later it had migrated below the coronoid process. During the 6 years, it appeared to have slowly moved a distance of about 6cm. No symptoms related to the tooth have developed.<BR>We speculate that the movement was caused by rupture of the gubernacular cord, early loss of deciduous teeth, hypodontia, microdontia, or other factors.

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