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CROSS-SECTIONAL MORPHOLOGY AND MINIMUM CANAL WALL WIDTHS IN C-SHAPED ROOT OF MANDIBULAR MOLARS

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Á¶¿ë¹ü ( Cho Young-Bem ) - ´Ü±¹´ëÇб³ Ä¡°ú´ëÇÐ º¸Á¸Çб³½Ç

Abstract

C-shape ±Ù°üÀº ÁÖ·Î ÇÏ¾Ç Á¦ 2´ë±¸Ä¡¿¡¼­ º¸ÀÌ´Â ÇغÎÇÐÀû º¯ÀÌ ÇüÅ·μ­, ±× Ư¡Àº °¢ ±Ù°üÀ» ¿¬°áÇÏ´Â finÀ̳ª webÀÌ Á¸ÀçÇÑ´Ù. ÀÌ·± ÇغÎÇÐÀûÀ¸·Î º¹ÀâÇÔÀº ±Ù°üÄ¡·á½Ã¿¡ ¼¼Á¤°ú ¼ºÇü ¹× ±Ù°üÃæÀüÀ» ¹æÇØÇϸç, °ú´ÙÇÑ ±â±¸ Á¶À۽ÿ¡ ¶æÇÏÁö ¾Ê´Â õ°øÀ» À¯¹ßÇϱ⵵ ÇÑ´Ù. ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº C-shape Ä¡±ÙÀ» °¡Áø ÇÏ¾Ç Á¦2 ´ë±¸Ä¡ÀÇ ÇغÎÇÐÀûÀÎ ÇüÅÂ¿Í Ä¡±ÙÀÇ À§Ä¡¿¡ µû¸¥ ÃÖ¼Ò ±Ù°üº® µÎ²²¿¡ ´ëÇÏ¿© ¿¬±¸ÇÏ°íÀÚ ÇÏ¿´´Ù. ¹ß°ÅµÈ ÇÏ¾Ç ´ë±¸Ä¡Áß C-shape Ä¡±ÙÀ» °¡Áø Ä¡¾Æ¸¦ 30°³ ¼±º°ÇÏ¿© ¹æ»ç¼± »çÁø ¹× ÇùÃø, ¼³Ãø, Ä¡±Ù´Ü ºÎÀ§¸¦ µðÁöÅÐ Ä«¸Þ¶ó¸¦ ÀÌ¿ëÇÏ¿© ÃÔ¿µÇÏ¿´´Ù. ÀÚ°¡ ÁßÇÕÇü ±³Á¤¿ë ·¹Áø (Orthodontics resin, Densply/Caulk, U.S.A)À» ÀÌ¿ëÇÏ¿© Ä¡°üºÎ¸¦ Á¦°ÅÇÑ Ä¡¾Æ¸¦ ¸Å¸ôÇÑ ÈÄ °¢°¢ÀÇ ½ÃÆíÀ» Accutom-50 (Struers, Denmark)¿¡ °íÁ¤½ÃÄÑ 1 mm °£°ÝÀ¸·Î Àý´Ü, ¿¬¸¶ÇÑ ´ÙÀ½ Àý´Ü¸éÀ» ¼ö¼ú¿ëÇö¹Ì°æ¿¡ ¿¬°áµÈ µðÁöÅÐ Ä«¸Þ¶ó (Coolpix 995, Nikon, Tokyo, Japan)¸¦ ÀÌ¿ëÇÏ¿© °¢°¢ÀÇ »óÀ» ÃÔ¿µÇÏ¿´´Ù. 30°³ Ä¡¾Æ¿¡¼­ ÃÔ¿µÇÑ 197°³ÀÇ Ä¡¾Æ´Ü¸éÀ» Root thickness gauge programÀ» ÀÌ¿ëÇÏ¿© ±Ù°üÇüÅÂÀÇ º¯È­¸¦ ºÐ·ùÇÏ°í ºÎÀ§º° ±Ù°ü°ú Ä¡¾Æ¿Üº® »çÀÌ¿¡ Á¸ÀçÇÏ´Â »ó¾ÆÁúÀÇ Ãּҵβ²¿¡ ´ëÇØ ¿¬±¸ ºÐ¼®ÇÏ¿´´Ù. 1. ±Ù°üÀÔ±¸¿¡¼­ C IÀÌ °¡Àå ¸¹ÀÌ (73%) °üÂûµÇ¾úÀ¸³ª Ä¡±Ù´ÜºÎ·Î °¥¼ö·Ï ±Ù°ü ÇüÅÂÀÇ ´Ù¾çÇÑ º¯È­¸¦ º¸¿© C II¿Í C IIIÀÇ ±Ù°üÇüÅ°¡ ¸¹ÀÌ °üÂûµÇ¾úÀ¸¸ç, 11 °³ÀÇ (36%)Ä¡¾Æ¿¡¼­´Â ±Ù°üÀÔ±¸¿¡¼­ Ä¡±Ù´ÜºÎ±îÁö ±Ù°üÇüÅÂÀÇ º¯È­¸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù. ±Ù°üÀÔ±¸¿¡¼­ ´ÜÁö 2°³ÀÇ Ä¡¾Æ¿¡¼­ ³ªÅ¸³­ C III typeÀº Ä¡±Ù´ÜºÎ·Î °¥¼ö·Ï ³ôÀº ¹ßÇöºóµµ¸¦ ³ªÅ¸³»¾ú´Ù. 2. C-shape ±Ù°üÀº ±Ù°üÀÔ±¸ ºÎÀ§¿¡¼­´Â continuous ³ª semicolon canalÀ» °¡Áö³ª Ä¡±Ù´ÜºÎ·Î °¥¼ö·Ï 2°³³ª 3°³ÀÇ ±Ù°üÀ» °®´Â °æ¿ì°¡ ¸¹´Ù. 3.Æò±ÕÀûÀÎ ±Ù°ü°ú Ä¡Áú»çÀÌÀÇ ÃּҰŸ®´Â ±Ù÷ºÎÀÇ ¼³ÃøºÎÀ§¿¡¼­ ³ªÅ¸³µ´Ù.

The C-shaped canal system is an anatomical variation mostly seen in mandibular second molars, although it can also occur in maxillary and other mandibular molars. The main anatomical feature of C-shaped canals is the presence of fins or web connecting the individual root canals. The complexity of C-shaped canals prevents these canals from being cleaned, shaped, and obturated effectively during root canal therapy, and sometimes it leads to an iatrogenic perforation from the extravagant preparation. The purpose of this study was to provide further knowledge of the anatomical configuration and the minimal thickness of dentinal wall according to the level of the root. Thirty extracted mandibular second molars with fused roots and longitudinal grooves on lingual or buccal surface of the root were collected from a native Korean population. The photo images and radiographs from buccal, lingual, apical direction were taken. After access cavity was prepared, teeth were placed in 5.25% sodium hypochlorite solution for 2 hours to dissolve the organic tissue of the root surface and from the root canal system. After bench dried and all the teeth were embedded in a self-curing resin. Each block was sectioned using a microtome (Accutom-50, Struers, Denmark) at interval of 1 mm. The sectioned surface photograph was taken using a digital camera (Coolpix 995, Nikon, Japan) connected to the microscope. 197 images were evaluated for canal configurations and the minimal thickness of dentinal wall between canal and external wall using ¡¯¡¯Root Thickness Gauge Program¡¯¡¯ designed with Visual Basic. The results were as follows : 1. At the orifice level of all teeth, the most frequent observed configuration was Melton¡¯¡¯s Type C I (73%), however the patterns were changed to type C II and C III when the sections were observed at the apical third. On the other hand, the type C III was observed at the orifice level of only 2 teeth but this type could be seen at apical region of the rest of the teeth. 2. The C-shaped canal showed continuous and semi-colon shape at the orifice level, but at the apical portion of the canal there was high possibility of having 2 or 3 canals 3. Lingual wall was thinner than buccal wall at coronal, middle, apical thirds of root but there was no statistical differences.

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C-shaped Canal;Morphology;Mandibular Molar;Canal Wall Width;Configuration

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KCI