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A STUDY ON PERIODONTAL CHANGE OF FURCATION AREA FOLLOWING EXPERIMENTAL PULP EXPOSURE IN DECIDUOUS MOLAR WITH ACCESSORY CANAL IN KITTEN

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Abstract

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ÀúÀÚµéÀº À¯±¸Ä¡ÀÇ Ä¡±Ù°£°ñÀÇ Èñ¹ÚÈ­(rarefaclion)ÀÇ ¿øÀÎÀ» ±Ô¸íÇϱâ À§Çؼ­ »ýÈÄ 10-15
ÁÖµÈ 11¸¶¸®ÀÇ °¡¹¦Áß 10¸¶¸®ÀÇ ÇÏ¾Ç Á¿ì Á¦2À¯±¸Ä¡¸¦ No. 1/2round bur·Î Ä¡°üÀÇ ±Ù½É
ÇéÃø Ä¡¼ö°¢À» ³ëÃâ½ÃÅ°°í 2, 4, 6, 8, 9, 12, 14, 16, 18, 20ÀÏ ±îÁöÀÇ º´º¯ °úÁ¤À» ±¸³» Ç¥ÁØ
¹æ»ç¼± »çÁø ¹× ±¤ÇÐÇö¹Ì°æÀ¸·Î °üÂûÇÏ¿© ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù.
1. ±¸³» Ç¥ÁØ ¹æ»ç¼± »çÁø»ó, ´ëÁ¶±º °¡¹¦¿¡¼­´Â Á¤»óÀûÀÎ Ä¡±Ù¸·°ú Ä¡±Ù°£°ñÀ» º¸¿©ÁÖ¾ú
À¸¸ç ½ÇÇèÀû Ä¡¼ö³ëÃâ 20ÀÏÈÄ¿¡ Èñ»ýµÈ °¡¹¦¿¡¼­´Â Ä¡±Ù¸·ÀÌ µÎÅÍ¿öÁö°í ºÐÁöºÎÀÇ Ä¡Á¶¹é¼±
ÀÌ ¼Ò½ÇµÇ¾úÀ¸¸ç Ä¡±Ù°£°ñÀÇ Èñ¹ÚÈ­¸¦ º¸¿©ÁÖ¾ú´Ù.
2. ±¤ÇÐÇö¹Ì°æ»ó, ½ÇÇ豺ÀÇ Á¦2À¯±¸Ä¡ÀÇ 75%¿¡¼­ Ä¡¼ö°­À¸·ÎºÎÅÍ ºÐÁöºÎ¿¡ Á¸ÀçÇÏ´Â Ä¡ÁÖ
Á¶Á÷°ú ¿¬°áµÇ¾î ÀÖ´Â ºÎ°ü(accessory canals)ÀÌ °üÂûµÇ¾ú´Ù.
3. ºÎ°üÀ» °®´Â Á¦2À¯±ÔÄ¡¿¡ Ä¡¼öÀÇ º´º¯ º¯È­°¡ ÀÖ´Â °æ¿ì Ä¡¼ö°­ ¹× Ä¡±ÙºÐÁöºÎÀÇ Ä¡ÁÖ
Á¶Á÷¿¡ ¿°Áõ º¯È­°¡ ÀÖ¾úÀ¸³ª Ä¡±Ù´ÜºÎ¿¡´Â ¿°Áõ¼Ò°ßÀÌ ¹ß°ßµÇÁö ¾Ê¾Ò´Ù.
4. ºÎ°üÀ» °®Áö ¾ÊÀº Á¦2À¯±¸Ä¡ÀÇ Ä¡¼ö ¿°Áõ º¯È­´Â ¼ö¼úºÎÀ§¿¡ ÇÑÁ¤µÇ¾î ³ªÅ¸³ª°Å³ª ±Ù
½ÉÄ¡¼ö°üÀÇ Ä¡°üºÎ¿¡ ±¹ÇÑµÇ¾î ³ªÅ¸³µ´Ù.
5. Ä¡¼ö¸¦ ³ëÃâ½ÃÅ°Áö ¾ÊÀº ´ëÁ¶±ºÀÇ ÇÏ¾Ç Á¦1, 2 À¯±¸Ä¡¿Í ½ÇÇ豺ÀÇ Á¦1À¯±¸Ä¡ÀÇ ºÐÁöºÎ
¿Í Ä¡±Ù´ÜºÎ¿¡¼­ÀÇ Á¶Á÷Àº Á¤»óÀ̾ú´Ù.
ÀÌ»óÀÇ °á°ú·Î ¹Ì·ç¾î °¡¹¦ À¯±¸Ä¡ÀÇ ½ÇÇèÀû Ä¡¼ö³ëÃâ¿¡ µû¸¥ Ä¡±Ù ºÐÁöºÎ Ä¡±Ù¸·°ú Ä¡±Ù
°£°ñÀÇ º´º¯º¯È­´Â Ä¡¼ö°­°ú Ä¡±Ù ºÐÁöºÎ¸¦ ¿¬°áÇÏ´Â ºÎ°üÀÌ ¹ÐÁ¢ÇÑ °ü°è°¡ ÀÖ´Â °ÍÀ¸·Î »ç
·áµÇ¾ú´Ù.
#ÃÊ·Ï#
The lesions that involve the furcation region of multirooted teeth may have an
endodontic as well as a periodontal origin.
Many authors have indicated the interrelationship of the pulp and the periodontium.
The infection may be pass between the two through the apical and lateral or accessory
canals.
Infected deciduous molars display different roentgenographic findings from those of
permanent molars. While pathologic changes are seen roentgeno-graphically at the root
apex of the permanent molar, the pathologic changes are evidenced by a radiolucent
zone between the roots in the deciduous molar.
In order to investigate the reasons for this interradicular rarefaction in the deciduous
dentition, experimental pulpal exposures were made in the mesiobuccal pulp horn of
mandibular second deciduous molars of the kittens with no.1/2 round bur. The kittens
were from 10 to 15 weeks of age and were divided into two groups, 10 experimental
group and 1 control group.
The animals were sacrificed in the regular interval from 2 to 20 days after pulpal
exposure.
The specimens were observed by the light microscope and intraoral standard
radiograph.
The results were as follow :
1. Radiographically, normal interradicular periodontal membrane and inter-radicular
bone were shown in control group. In the animal sacrificed after 20 days, a definite
thickening of the interradicular periodontal membrane, the destruction of lamina durn of
furcation area, and interradicular rarefaction were observed.
2. Light microscopically, operated teeth had accessory canals(75%) running from pulp
chamber to the periodontium in the bifurcation region.
3. The pulpal changes of lower 2nd deciduous molar with accessory canal were
followed by changes in the periodontium at the opening of accessory canal. These
changes led to pathologic destruction of much of the pulp tissue together with
inflammation of periodontium in the bifurcation. But pathologic change is not seen at
root canal and apex.
4. Palpal inflammatory changes of lower 2nd deciduous molar without accessory canals
were confined to the area beneath the exposure or the the coronal part of mesial root
canal.
5. In the mandibular 1st and 2nd deciduous molars without pulpal exposure and 1st
deciduous molars of experimental group, the pulp, periodontium in the bifurcation, and
apical regions were normal.
From the above results, it is suggested that accessory canals play a major role
causing furcation lesion following experimental pulpal exposure in deciduous molar in
kittens.

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