下顎 乳臼齒 早期喪失이 後繼承齒 맹출 및 隣接齒傾斜에 미치는 影響
THE INFLUENCE OF PREMATURE MANDIBULAR PRIMARY MOLARS EXTRACTION ON THE ERUPTION OF THEIR SUCCESSORS AND THE INCLINATION OF THEIR ADJACENT TEETH
윤병이,
소속 상세정보
윤병이 ( Yoon Byoung-Ee ) - 서울대학교 치과대학 소아치과학교실
KMID : 0362619890100060339
Abstract
The sample in this investigation included 40 children aged seven to eight year and six months (mean age:7year-10months) at the beginning of the study. In order to evaluate the changes of the adjacent teeth and dental arch and the eruptional status of the successors following the premature loss of mandibular primary molars, the study casts were taken and examined a week, 6 months, one year, one year&nine months, two year&three months and two year&nine months respectively after premature extraction of unilateral; mandibular first primary molars in 22 children and second primary molars in 18 children. The results were as follows;
1. Eruption of successors on extraction side was earlier than that on non-extraction side after premature loss of mandibular primary molars.
2. The degree of space closure on extraction side was most conspicuous in six months after the premature loss of mandibularrprimary molars.
3. The degree of space closure on extraction side of primary first molar was more prominent than that on extraction side of the primary second molar.
4. Space of the extraction side was gradually closed after premature loss of mandibular primary molars till the eruption of their successors and then the space was opened.
5. Arch_ length was decreased till around the period of the eruption of successors of prematurely lost mandibular primary molars.
6. The measurement of arch width revealed continuous increase.
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