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AN EXPERIMENTAL STUDY ON THE EFFECTS OF LUNATION INJURY ON INCOMPLETELY ROOT-FORMED RAT MOLAR.

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Abstract

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1. Å»±¸¼º ¿Ü»ó¿¡ ´ëÇÑ ¹ÝÀÀÀº Ä¡À¯°úÁ¤À» º¸ÀÌ´Â Ä¡À¯±º°ú Áö¼ÓÀûÀ¸·Î Ä¡±ÙÀÇ Èí¼ö¿Í Ä¡
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¸ðµç ¼Ò°ßÀÌ Á¤»óÀ¸·Î ȸº¹µÈ ¹Ý¸é ÁøÇ༺ Èí¼ö±º¿¡¼­´Â ¼Õ»óÈÄ 3ÀÏ¿¡ Ä¡¼ö°­ ÀϺο¡ ³ó¾ç
ÀÌ Çü¼ºµÇ°í Á¦ 1 ÁÖ¿¡´Â Ä¡¼öÀüü°¡ ±«»çµÇ¾ú´Ù.
2. ¼Õ»óÈÄ Ä¡¿îµÈ Ä¡¼ö¿¡¼­´Â »ó¾ÆÁú Çü¼ºÀÌ Á¤»ó¿¡ ºñÇÏ¿© ¿Ï¸¸ÇÏ¿´´Ù.
3. Ä¡¼öÀÇ ±«»ç´Â Ä¡±Ù Èí¼ö¸¦ ÃËÁø½ÃÅ°°í Ä¡¼¼°üÀº Ä¡¼ö°­ÀÇ ¿°Áõ»ê¹°À» Ä¡±Ù¸·À¸·Î È®
»ê½ÃÅ°´Â Åë·Î°¡ µÈ´Ù.
4. Ä¡±Ù ºÐÁöºÎ Ä¡ÁÖÁ¶Á÷ÀÇ Æı«°¡ °¡Àå ½ÉÇÏ¿´°í ÁøÇ༺ Èí¼ö±º Á¦ 4ÁÖ¿¡¼­ Ä¡Áָͳ¶»ó
ÇÇÀÇ Áõ½ÄÀÌ ÃÖÃÊ·Î ÀÎÁöµÇ¾ú´Ù.
5. Ä¡¼öÀÇ ±«»ç, Ä¡±ÙÀÇ Èí¼ö¿Í Ä¡Á¶°ñÀÇ Èí¼ö ¹× Ä¡Áָͳ¶ »óÆÛÀÇ Áõ½ÄÀº Å»±¸¼º ¼Õ»óÀÇ
¿¹ÈÄ¿¡ °áÁ¤Àû ÀÎÀÚÀÌ´Ù.
#ÃÊ·Ï#
The purpose of this study is to evaluate the effects of luxation injury on incompletely
root developed teeth. Mandibular first molar of three weeks old Sprague-Dawley rats
were luxated an replaced on the original position. The histopathologic changes of the
pulp, the root and the periodontium were observed with time intervals.
The results were as follows:
1. The tissue reaction to luxation injury were divided into two groups; repaired group
and progressive resorption group which shows persistant root resorption and periodontal
destruction. All of the signs of injury were disappeared within two weeks in repaired
group, on the other hand the progressive resorption group showed pulp abscess on 3rd
day and pulp gringene on first weak after injury.
2. In contrast with the control group, the repaired group showed retarded development
of dentin after luxation injury.
3. The nonvital teeth with pulp gangrene accelerated root resorption and the dentinal
tubule would be a pathway of the inflammatory products of the pulp to the
periodontium.
4. The tissue destruction was most prominent in the periodontium of bifurcation area,
and epithelial proliferation of the periodontal pocket was observed initially in this area.
5. Pulp gangrene, root resorption, alveolar bone resorption and proliferation of the
pocket epithelium were the decisive factors of the prognosis of luxation injury.

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