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A SEM Study Of Radiation Effects On The Rat Molar Enamel Formation

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Abstract

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2. ¹ý¶ûÁúÀúÇü¼ºÀÇ ¾ç»óÀº 1±º°ú 2±º¿¡¼­´Â ±×¹° ¸ð¾çÀ¸·Î 3±º°ú 4±ºÀº ¼±ÇüÀ¸·Î °üÂûµÇ
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4. 5±º¿¡¼­´Â ´ëÁ¶±º°ú ºñ±³ÇÏ¿© À¯ÀÇÇÑ º¯È­¸¦ °üÂûÇÏÁö ¸øÇÏ¿´´Ù.
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The purpose of this study was to investigate the effects of radiation on the formation
of rat molar enamel at the developmental stage.
The experimental animals were divided into five groups and were irradiated roil)ale
dose of 396cGy ; 1st group old 14th day of gestation, 3rd group on 19th day of
gestation, 3rd group on 3 days after birth, 4th group on 8 days after birth, 5th group on
28 days after birth. The control and 1, 2, 3, and 4th experimental groups were sacrificed
on 2, 4, and 6 weeks and the 5th groups were sacrificed on 1 day and 2 weeks after
irradiation.
Distal 1/2 and occlusal 1/3 enamel surface of lingual side of lingual cusp, and
fractured surface of lingual side of lingual cusp in a longitudinal direction of the
mandibular first molar were examined using scanning electron microscope.
The following results were obtained.
1. The roughness of enamel surface and enamel hypoplasia were increased in a
sequence of 4th, 1st, 2nd, and 3rd experimental group, and the enamel cracks were
increased in the 1 st and 2nd experimental group.
2. The pattern of enamel hypoplasia had a network from on the 1st and 2nd
experimental group, and appeared a linear shape on the 3rd experimental group, and
then the crator-like enamel defects were observed in all experimental groups (especially
1 st and 2nd experimental group) except 5th.
3. Dentinoenamel junction showed the clear-cut and straight appearance except 5th
experimental group.
4. There was no significant difference between 5th experimental and control group.

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