Three cases in which the lower first molar was successfully aligned in the dental arch

DOI 1 Citations 23 References
  • YAMAMOTO Gaku
    Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science
  • OHTA Yoshiyuki
    Ohta Orthodontic Clinic
  • TANAKA Akio
    Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science
  • NAKATA Toshiaki
    Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science
  • INODA Hirofumi
    Department of Oral and Maxillofacial Surgery, Kohoku General Hospital
  • YOSHITAKE Kazusada
    Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science

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Other Title
  • 埋伏した下顎第1大臼歯を歯列に加えることができた3症例

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Abstract

Although impaction of the lower first molar is extremely rare, we have encountered three cases of lower first molar impaction. Case 1 involved a 9-year-old girl with the chief complaint of retarded eruption of 6·Ê. Orthopantomography revealed dental follicular cyst originating from 6·Ê. Case 2 involved an 11-year-old boy, who consulted our department hoping to undergo induced eruption of 6·Ê. Orthopantomography revealed that 6·Ê was submerged and inclined distally. Case 3 involved a 9-year-old boy with the chief complaint of retarded eruption of 6·Ê. Orthopantomography revealed that the roots of 6·Ê were crooked distally. In cases 1 and 3, fenestration was performed, and in case 2, traction was performed. In all cases, the impacted first molar was successfully aligned in the dental arch.<BR>There are various etiologic factors of tooth impaction, and they are largely divided into systemic factors and local factors. In case 1, a dental follicular cyst impeded the eruption of 6·Ê. In case 2, the displacement of the tooth germ, insufficient eruption force, and anomalous direction of eruption were thought to have prevented the normal eruption of 6·Ê. In case 3, decreased eruption force caused by the crooked roots was thought to have led to impaction of 6·Ê.<BR>If impaction of the lower first molar is discovered before eruption of the lower second molar, treatment can be easy. Therefore, pediodic examination including radiography during the eruption period of the lower first molar will be helpful, especially when the eruption of a lower first molar is delayed compared to the others. In such cases, careful examination should be recommended to the patient. We also think that induced eruption is certainly worth trying in cases presenting no marked malformation or ankylosis of the tooth.

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