本学歯学部附属病院小児歯科外来における乳臼歯埋伏についての臨床的考察

DOI 被引用文献8件 参考文献33件
  • Kudo Masaki
    Department of Pediatric Dentistry, Hokkaido University, School of Dentistry
  • Konta Hinako
    Department of Pediatric Dentistry, Hokkaido University, School of Dentistry
  • Oguchi Haruhisa
    Department of Pediatric Dentistry, Hokkaido University, School of Dentistry

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タイトル別名
  • Clinical Observation of Unerupted Primary Molars in the Patients of Hokkaido University Pediatric Dental Clinic

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We surveyed unerupted primary teeth using 9,128 patients who were registered at the Pediatric Dental Clinic of Hokkaido University Dental Hospital. We found ten cases with unerupted primary molars. The ten patients consisted of five boys and five girls, aged from 3 years and 4 months to 8years and 3 months. All of them had unerupted teeth in their molar regions, i. e. second primary molars, in which, half were in mandibular and the other half in maxillary region. The Clinical features were examined on following guidelines;<BR>A. Is there anything disturbing primary tooth eruption?<BR>B. Is there dislocation of primary molars or/and their successors?<BR>C. Is the space available for the eruption of the primary molar?<BR>D. What is the eruptive direction of the primary molar?<BR>Two cases had the pathological abnormalities which disturbed the primary molar eruption, one having a cyst and the other a tooth-like calcified object. Radiografic examination revealed that adjacent premolars were found in six out of the ten patients, but no premolars in four cases at the time of their first visits.<BR>Severe dislocation of the second primary molars and second premolars were found in two cases, one case had a reversed position of the primary molar and its successor and the other had dislocation of the second premolar between the roots of the second primary molar and the first molar.<BR>Four patients had space loss for the eruption of the primary molar, and six had enough space, although one of them lost her eruptive space due to the ankylosed primary second molar.<BR>We made a protocol for therapeutic procedures base on the previous guidelines and found that the protocol was useful for making therapeutic plan for primary teeth molar impactions.<BR>In eight cases excluding the two cases with extracted primary molars because of severe impaction, a follow-up study revealed the prognosis of unerupted primary molars as follows; in four cases, the primary second molars had erupted, in two cases, the impacted teeth were extracted because of invasive carious lesions, one case was extracted because of orthodontic problem, and one were unkown.<BR>Two uneruptied primary molars which showed severe dislocation were extracted based on the protocol. After extraction of the primary molar, one successor erupted normally, and the other premolar grew normally in the adjacent bone.<BR>We also discussed about the developmental stage of premolars from its predecessor and it might be an important factor related to the occurrence of primary molar impaction.

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