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EFFECT OF CANAL TAPERING IN TEETH OF VARIOUS APICAL SIZE & CROSS-SECTIONAL CONFIGURATION ON MICROLEAKAGE

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±èÁ¤Èñ/Kim JH ÀÌ°æÇÏ/À̼¼ÁØ/À¯¹Ì°æ/À̱¤¿ø/Lee KH/Lee SJ/Yu MK/Lee KW

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº ±Ù´Ü°øÀÇ Å©±â°¡ ´Ù¾çÇÑ Ä¡¾Æ¿¡¼­ ±Ù´Ü°ø È®´ëÀÇ À¯¹«¿¡ µû¸¥ ±Ù°ü¼ºÇü½Ã Ä¡¾ÆÀÇ ¹Ì¼¼´©ÃâÀ» Æò°¡Çϱâ À§ÇÔÀÌ´Ù. 1±Ù°ü Ä¡¾Æ 60°³¸¦ Ä¡±Ù÷ »ó¹æ 5mm¿¡¼­ Àý´ÜÈÄ °¢ Ä¡¾ÆÀÇ ±Ù´Ü°ø Å©±â¿¡ µû¶ó Å« ±Ù´Ü°ø (L) ÀÛÀº ±Ù´Ü°ø (S)À¸·Î ³ª´©¾ú´Ù ÀÌ µÎ ±ºÀ» Ä¡±Ù÷ »ó¹æ 5mmÀÇ È¾´Ü¸é»ó ±Ù°üÀÇ ÇüÅ·Π¿øÇü (R)°ú ³­Çü (O)À¸·Î ³ª´©¾ú´Ù(SR, SO, LR, LO). °¢ ±ºÀº Quantec series Nickel-Titanium (Ni-Ti) rotary fileÀ» ÀÌ¿ëÇÏ¿© .02 taper·Î ¼ºÇü ÈÄ Ãø¹æ°¡¾Ð¹ýÀ¸·Î ÃæÀüÇÏ¿´´Ù. ´©ÃâÀº 40 $cmH_2O$ ¾Ð·ÂÇÏ¿¡ fluid transport method·Î ÃøÁ¤ÇÏ¿´´Ù. ÃøÁ¤ ÈÄ ´©ÃâÀÌ ÀÖ´Â ½ÃÆíÀº .04 taper¿Í .06 taper·Î Àç±Ù°üÄ¡·á ÇÏ¿© ´Ù¼¼ ¹Ì¼¼´©ÃâÀ» Æò°¡ÇÏ¿´´Ù. Åë°èÇÐÀûÀ¸·Î chi-square test¿Í fisher¡¯¡¯s exact test¸¦ ÀÌ¿ëÇÏ¿´´Ù. °á°ú´Â ´ÙÀ½°ú °°´Ù. 1. .02 taper·Î ¼ºÇüÇÑ ±º¿¡¼­´Â ±Ù´Ü°øÀÇ Å©±â¿¡ µû¸¥ ¹Ì¼¼´©ÃâÀº Åë°èÀûÀ¸·Î À¯ÀǼºÀÌ ÀÖ¾ú°í (p < 0.05) .04 taper·Î ¼ºÇüÇÑ ±º¿¡¼­´Â Åë°èÀûÀ¸·Î À¯ÀÇÇÑ Â÷À̸¦ º¸ÀÌÁö ¾Ê¾Ò´Ù (p > 0.05) .2.±Ù÷ »ó¹æ 5 mm¿¡¼­ ±Ù°ü´Ü¸éÀÇ ÇüÅ¿¡ µû¸¥ ¹Ì¼¼´©ÃâÀº Åë°èÀûÀ¸·Î À¯ÀÇÇÏÁö ¾Ê¾Ò´Ù (p > 0.05). 3. LR group°ú LO group¿¡¼­´Â .02 taper·Î ¼ºÇüÇÑ ±º°ú .04 taper·Î ¼ºÇüÇÑ ±º»çÀÌ¿¡ À¯ÀÇÇÑ Â÷À̸¦ º¸¿´´Ù (p < 0.05).

The aim of this study was to evaluate the microleakage of teeth according to root canal preparation with & without apical enlargement in various size of apical foramen. 60 extracted one canal roots were cross-cutted at 5 mm from root apex and divided into two groups according to their apical foramen size of large (L) and small (S). Each group was subdivided into two groups accordance with their cross-sectional configuration at 5 mm from apex, round (R) and ovoid (O); SR Group, SO Group LR Group, LO Group. Each group was shaped in .02 taper by Quantec series Nickel-Titanium (NiTi) rotary file, obturated by lateral condensation method. Leakage was measured using a fluid transport model under 40 $cmH_2O$ pressure. After the leakage test, blocks which had showed the leakage retreated with .04 taper and ,06 taper and evaluated the degree of fluid filtration in each group. The data was analysed statistically using chi-square test and fisher¡¯¡¯s exact test. The results obtained were as follows : 1. Significant difference in leakage was found in groups which had different apical foramen size in .02 taper instrumentation (p < 0.05), but not in .04 taper instrumentation (p > 0.05) 2. The difference in microleakage according to the shape of canal was not evident at 5 mm from apex (p > 0.05). 3. There was correlation between .02 taper instrumentation and .04 taper instrumentation in LR group, LO group (p < 0.05).

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