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KMID : 0370819940090010088
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Yonsei Journal Dental Science
1994 Volume.9 No. 1 p.88 ~ p.102
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Evaluation of age and eruption stages of first permanent molars using panoramic radiographs
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Abstract
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Among the children who visited the Pediatric Dentistry of Yonsei Dental College from April, 1992 to April, 1994 with the chronologic ages from 3 years 0 months to 9 years 11 months, 561 and 459 panoramic radiographs total of 1020 from 533 males
and
435
females respectively were used as research data. The children who have systemic disease which seem to have affected the development of teeth and dentition were excluded.
On the traced panoramic radiographs, second primary molar was used as reference for deciding the eruption stages of first permanent molar. Occlusal line(OL) was established by connecting the mesial and distal cusps and the Cervical line(CL)
passing
the
distal side of anatomical cervix of second primary molar parallel to the occlusal line. Crown midline (CM) was acquired by bisecting the occlusal and cervical the FL, stage II as tooth germs under the CL, stage III as tooth germs under the CM,
stage IV
as tooth germs under the OL, and stage V as tooth germs that have reached the OL. Following results were achieved by using these references.
1. Significant difference was present among the ages for each eruption stage of first permanent molar.
2. No significant difference was present for the eruption ages between the male and the female.
3. Earlier eruption for the mandible than maxilla was present.
4. No difference between eruption stages of right and left side was present.
5. Eruption stage I was the highest for the age under 5 and the stage V was the highest for the age over 7.5 as it was shown in the eruption stage distribution according chronologic age.
According to these results, over the 50% of the objects reached occlusal plane at the age of 6.0 in mandible, 7.0 in maxilla for the females, and at the age of 6.5 in mandible and 7.0 in maxilla for males. So it can be concluded that use of these
references of panoramic radiographs can be utilized as the diagnostic data for detecting eruption process of first permanent molar and earlier detection of problems following the eruption abnormalities.
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KEYWORD
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