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Effect of needle tip design and position, and irrigant flow rate on apical pressure

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ÀÌâÇÏ, Á¶¼³¾Æ, ÀÓ¹ü¼ø, ÀÌÀκ¹,
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ÀÌâÇÏ ( Lee Chang-Ha ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
Á¶¼³¾Æ ( Jo Seol-Ah ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç
ÀÓ¹ü¼ø ( Lim Bum-Soon ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°ú»ýüÀç·á°úÇб³½Ç
ÀÌÀκ¹ ( Lee In-Bog ) - ¼­¿ï´ëÇб³ Ä¡ÀÇÇдëÇпø Ä¡°úº¸Á¸Çб³½Ç

Abstract

º» ¿¬±¸¿¡¼­´Â ±Ù°ü ³»ÀÇ ÁÖ»çħ ¸»´ÜÀÇ À§Ä¡, ±Ù°ü ¼¼Ã´¾×ÀÇ ÁÖÀÔ ¼Óµµ, ÁÖ»çħ ¸»´ÜÀÇ Çü»óÀÌ ±Ù°ü ¼¼Ã´ ½Ã ¹ß»ýÇÏ´Â Ä¡±Ù´Ü ¾Ð·Â¿¡ ¹ÌÄ¡´Â ¿µÇâÀ» Æò°¡ÇÏ°íÀÚ ÇÏ¿´´Ù. 5°³ÀÇ »ç¶÷ ÇÏ¾Ç ¼Ò±¸Ä¡¿¡ ±Ù°ü ¿Íµ¿ Çü¼º ÈÄ #35(0.06 taper) ´ÏÄÌ-ƼŸ´½ ȸÀü½Ä ±â±¸·Î ±Ù°üÀ» Çü¼ºÇÏ¿´´Ù. ÁÖ»çħ ¸»´ÜÀÇ Çü»ó¿¡ µû¶ó ±¸ºÐµÇ´Â notched, side-vented, flat 3°¡Áö Á¾·ùÀÇ ÁÖ»çħÀ» ±Ù´Ü ÇùÂøºÎ·ÎºÎÅÍ Ä¡°ü ¹æÇâÀ¸·Î 1, 3, 5 mm °Å¸®°¡ µÇ´Â ÁöÁ¡(ÁÖ»çħ ¸»´ÜÀÇ À§Ä¡)¿¡ À§Ä¡½ÃÄ×´Ù. °¢ ±º¿¡ ´ëÇÏ¿© ¼¼Ã´¾× ÁÖÀÔ ¼Óµµ´Â 0.05, 0.1, 0.2, 0.3 ml/s·Î º¯È­½ÃÅ°¸é¼­ Ä¡±Ù´Ü ¾Ð·ÂÀ» ÃøÁ¤ÇÏ¿´´Ù. ³ª¸ÓÁö Á¶°ÇÀÌ µ¿ÀÏÇÑ °æ¿ì ÁÖ»çħ ¸»´ÜÀÇ À§Ä¡°¡ °¨¼ÒÇÒ¼ö·Ï, ¼¼Ã´¾× ÁÖÀÔ ¼Óµµ°¡ Áõ°¡ÇÒ¼ö·Ï Ä¡±Ù´Ü ¾Ð·ÂÀº À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù(p<0.05). ÁÖ»çħ ¸»´ÜÀÇ À§Ä¡¿Í ¼¼Ã´¾× ÁÖÀÔ ¼Óµµ°¡ µ¿ÀÏÇÑ Á¶°Ç ÇÏ¿¡¼­ side-vented ÁÖ»çħÀÌ °¡Àå ³·Àº Ä¡±Ù´Ü ¾Ð·ÂÀ» º¸¿´°í, notched, flat ÁÖ»çħ ¼ø¼­·Î Ä¡±Ù´Ü ¾Ð·ÂÀÌ À¯ÀÇÇÏ°Ô Áõ°¡ÇÏ¿´´Ù(p<0.05). ÁÖ»çħ ¸»´ÜÀÇ À§Ä¡°¡ 1mmÀÎ ±º ¶Ç´Â ¼¼Ã´¾× ÁÖÀÔ ¼Óµµ°¡ 0.1 ml/s ÀÌ»óÀÎ ±º¿¡¼­´Â ³ª¸ÓÁö Á¶°Ç¿¡ °ü°è¾øÀÌ ¸ðµç °æ¿ì¿¡¼­ Áß½ÉÁ¤¸Æ¾Ð(5.88mmHg)º¸´Ù ³ôÀº Ä¡±Ù´Ü ¾Ð·ÂÀ» ³ªÅ¸³Â´Ù. Flat ÁÖ»çħÀº ¼¼Ã´¾× ÁÖÀÔ ¼Óµµ¿Í ÁÖ»çħ ¸»´ÜÀÇ À§Ä¡¿¡ µû¸¥ Ä¡±Ù´Ü ¾Ð·ÂÀÇ ±Þ°ÝÇÑ Áõ°¡·Î ÀÎÇØ ÀÓ»ó¿¡¼­ »ç¿ëÀÌ ÃßõµÇÁö ¾ÊÀ¸¸ç, ¾ÈÀüÇÏ°í È¿À²ÀûÀÎ ±Ù°ü ¼¼Ã´À» ¼öÇàÇϱâ À§Çؼ­´Â ±Ù´Ü ÇùÂøºÎ·ÎºÎÅÍ Ä¡°ü ¹æÇâÀ¸·Î 3 mm ¶³¾îÁø ÁöÁ¡¿¡ ÁÖ»çħ ¸»´ÜÀ» À§Ä¡½ÃÅ°°í 0.05 ml/s ÀÌÇÏÀÇ ¼¼Ã´¾× ÁÖÀÔ ¼Óµµ·Î ±Ù°ü ¼¼Ã´¾×À» Àû¿ëÇØ¾ß ÇÒ °ÍÀÌ´Ù.

The purpose of this study was to evaluate the effect of needle tip design and position, and irrigant flow rate on apical pressure (AP) during root canal irrigation. Five human mandibular premolars were instrumented up to #35 (0.06 taper) using nickel-titanium rotary instruments. Three different needles according to change of needle tip design (notched, side-vented, and flat) were positioned at the point of 1, 3, and 5 mm from the apical constriction (needle tip position). For each needle tip design and position, APs were measured with varying flow rates of 0.05, 0.1, 0.2, and 0.3 ml/s. When the other conditions were controlled, AP increased with decreasing needle tip position or increasing irrigant flow rate (p<0.05). The AP of flat needle was the highest, followed by notched, side-vented needle for the same needle tip position and irrigant flow rate. The APs at needle tip position of 1 mm or with more than 0.1 ml/s flow rate were higher than central venous pressure (5.88 mmHg) for all conditions. Flat needle was not recommended for clinical use due to sharp increase of AP with changing needle tip position and irrigant flow rate. For safe and effective root canal irrigation, irrigant should be applied with the needle tip position of 3 mm and flow rate of less than 0.05 ml/s.

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Ä¡±Ù´Ü ¾Ð·Â; ¼¼Ã´¾× ÁÖÀÔ¼Óµµ; ÁÖ»çħ ¸»´ÜÀÇ Çü»ó°ú À§Ä¡
Apical pressure; Irrigant flow rate; Needle tip design and position

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