A Case of the Impacted Mandibular First Molar with Malformation of the Roots

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  • Kizawa Kiyoshi
    Department of Pedodontics, Tsurumi University School of Dental Medicine
  • Shimizu Tamotsu
    Department of Pedodontics, Tsurumi University School of Dental Medicine

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  • 歯根形成異常を示した埋伏下顎第1大臼歯の1症例

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Abstract

The patient, a 9-year-old boy, was referred to the Pedodontic Clinic of Tsurumi University Dental Hospital with the chief complaint being the impaction of the mandibular left first molar.<BR>Oral examination revealed that the mandibular left first molar was absent, and all the other first molars had erupted normally. In the lower left region, where the first molar should have erupted, there was no evidence of swelling of the alveolar process or inflammation of the mucous membrane.<BR>A radiographic examination showed that the impacted mandibular left first molar had distally curved roots and that the tip of the distal root had developed rather occlusally. The tooth was deplaced apically and was almost in contact with the inferior border of the mandibular corpus. There was a widening of the pericoronal space of the tooth, the dimension of which was about 2.5 mm. The associated pathology appears to be a dentigerous cyst.<BR>The gingival tissue covering the occlusal surface of the tooth was surgically removed. Radiographs taken postoperatively revealed that the tooth was actively erupting toward the occlusal plane. The malformation of the roots did not prevent the tooth from erupting. Eventually, the tooth erupted completely into its normal position, and was functional 17 months after the operation. The tooth was asymptomatic and firm in position. The follow-up X-ray survey showed that the condition of the tooth was satisfactory as was the surrounding tissues.

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