乳臼歯の早期抜去が後継小臼歯の萌出時期に及ぼす影響

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タイトル別名
  • The Effect of Early Extraction of Deciduous Molars on the Eruption Ages of Permanent Successors
  • ニュウキュウシ ノ ソウキ バツキョ ガ コウケイ ショウキュウシ ノ ホウシ

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The purpose of this investigation was to detemine what influence the early extraction of carious deciduous molars had on the eruption ages of permanent bicuspids.<BR>The investigation was based on dental records which were accumulated by a dental health program in 1972-1974 for 80 boys and 91 girls aged 6 years in the first grade of primaryschool in a rural village where there was no dentist. The program was composed of annual dental inspections followed by the extraction of carious deciduous teeth and the filling of carious permanent teeth. At the dental inspections, a tooth was regarded as erupted if any portion of the crown was visible and was also recorded for 4 to 6 years.<BR>In order to estimate the effect of early extraction of deciduous molars, the eruption ages of their bicuspids were grouped by the condition of deciduous predecessors either extracted at 6 to 8 years of age or not, and the cumulative frequency distribution of the groups and their median ages were compared.<BR>From the findings, it was clear that the eruption ages of maxillary bicuspids were greatly accelerated by the early extraction of deciduous predecessors but the mandibular bicuspids were either not affected or slightly delayed. The median eruption ages of maxillary successors in the groups of deciduous predecessors extracted were approximately 1 year to 2 years earlier than the groups of without extractions, but the median ages of mandibular successors of the extracted groups were the same or slightly late (Table 2, Fig. 1 to Fig. 8).<BR>Futhermore, the correlation coefficients between the extraction ages of deciduous molars and the eruption ages of permanent successors were calculated for each tgpe of permanent bicuspids and for different sex, but no statistically significant correlations were found (Table 4).<BR>The results of this investigation indicated that the early extraction of carious deciduousmolars at the age of 6 to 8 accelerated the progress of the maxillary successors but not that of the mandibular successors.

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