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THE EFFECTS OF IRRADIATION ON THE PERIODONTAL TISSUES OF RATS WITH THE LOW CALCIUM DIET

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Abstract

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3. ÀúÄ®½·½ÄÀÌ ¹æ»ç¼±Á¶»ç±º¿¡¼­´Â Á¤»ó½ÄÀÌ ¹æ»ç¼±Á¶»ç±º¿¡ ºñÇÏ¿© Ä¡ÁÖÀδëÁ¶Á÷ÀÇ Æı«
°¡ Á¶±â¿¡ ÀϾÀ¸³ª, °ð ȸº¹µÇ¾î ³ôÀº ¼¼Æ÷ÀÇ Ãæ½Ç¼º°ú Ä¡¹ÐÇÑ ±³¿ø¼¶À¯ÀÇ Çü¼ºÀÌ °üÂû
µÇ¾ú´Ù.
4. tumor necrosis factor¸¦ ÇÔÀ¯ÇÏ°í ÀÖ´Â Ä¡ÁÖÀδ뼼Æ÷´Â Á¤»ó½ÄÀÌ ¹æ»ç¼±ºñÁ¶»ç±º¿¡¼­
´Â ºñ±³Àû ¶Ñ·ÇÇÏ°Ô ´Ù¼ö °üÂûµÇ¾úÀ¸¸ç, Á¤»ó½ÄÀÌ ¹æ»ç¼±Á¶»ç±º¿¡¼­´Â ½ÇÇè 7ÀÏ¿¡ ¼Ò½ÇµÇ¾ú
À¸³ª, ½ÇÇè 14ÀÏ¿¡ ÀçÃâÇöµÇ¾ú´Ù. ¶ÇÇÑ ÀúÄ®½·½ÄÀÌÀÇ ¹æ»ç¼±ºñÁ¶»ç±º°ú Á¶»ç±º¿¡¼­´Â Àü¹ÝÀû
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#ÃÊ·Ï#
The purpose of this study was to investigate the changes of periodontal tissues in the
irradiated mandibular bone in rats which were fed normal diet and low calcium diet.
In order to carry out this experiment, 64 seven-week old Sprague-Dawley strain rats
weighing about 150 gms were selected and equally divided into one experimental group
of 32 rats and one control group with the remainder.
The experimental group and the control group were then subdivided into two groups
when the rats reached the age of 10 weeks, 16 rats were allotted for each subdivided
group was composed of 16 rats and exposed to irradiation.
The two groups were irradiated a single dose of 20 Gy on the only jaw area and
irraiated with a cobalt-60 teletherapy unit. The rats in the control and experimental
groups were serially dissected by fours on the 3rd, the 7th, the 14th and the 21st day
after irradiation. After each dissection, both sides of the dead rat mandibular bodies
were removed and fixed with 10% neutral formalin. The specimens sectioned and
observed in histopathological, histochemical, and immunocellular chemical methods.
The obtained results were as follows:
1. In the mandibles of rats with low calcium diet the increased number of fibroblasts
of periodontal ligaments, many small capillaries and irregular arrangement of loose
collagen fibers were detected and the partial resorption of dentin and cementum could be
found by the microscopic studies.
2. In the group of irradiated rate degenerated periodontal tissues led to the condition
of irregular arrangement of collagen fibers and the decreased number of fibroblasts. But
this condition was somewhat restored after 21 days of experiment.
3. Periodontal tissues of the irradiated rat group with low calcium diet were destroyed
earlier than those of the irradiated rat group with normal diet. Soon this condition was
restored and then high cellularity and dense collagen fibers were observed.
4. Many periodontal cells bearing tumor necrosis factor could be clearly observed in
the nonirradiated group of rats with normal diet whereas could not be observed on the
7th day and reappeared on 14th day in the irradiated group of rats with normal diet.
A few of them could be observed in the group of rats with low calcium diet, but they
could be dearly observed in the both groups after 21 days of experiment.

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