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A COMPARISON OF THE SHAPING ABILITY OF FOUR ROTARY NICKEL-TITANIUM FILES IN SIMULATED ROOT CANALS

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±èº¸Çý, ÃÖ°æ±Ô, ¹Ú»óÇõ, ÃÖ±â¿î,
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±èº¸Çý ( Kim Bo-Hye ) - °æÈñ´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç
ÃÖ°æ±Ô ( Choi Kyoung-Kyu ) - °æÈñ´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç
¹Ú»óÇõ ( Park Sang-Hyuk ) - °æÈñ´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç
ÃÖ±â¿î ( Choi Gi-Woon ) - °æÈñ´ëÇб³ ´ëÇпø Ä¡ÀÇÇаú Ä¡°úº¸Á¸Çб³½Ç

Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº 4°¡Áö ¿£Áø±¸µ¿Çü NiTi ±â±¸ÀÇ ±Ù°ü¼ºÇü·ÂÀ» ºñ±³ÇÏ´Â °ÍÀÌ´Ù. 32°³ÀÇ Åõ¸í·¹Áø¸ðÇüÀ» »ç¿ëÇÏ¿© ÆÄÀÏÀÇ ´Ü¸éµµ°¡ SÀÚ ÇüÅÂÀÌ°í "single length"¹æ¹ýÀ¸·Î ±Ù°ü¼ºÇüÀ» ½ÃÇàÇÏ´Â Mtwo¿Í crown-down ¹æ¹ýÀ¸·Î ±Ù°ü¼ºÇüÀ» ÇÏ´Â Profile, ProTaper Universal ¹× K3·Î ±Ù°ü¼ºÇüÀ» ÇÏ¿´´Ù (n = 8). ¸ðµç ±Ù°üÀº ÇÑ»ç¶÷ÀÇ ¼úÀÚ°¡ ±Ù´Ü°ø Å©±â°¡ #30ÀÌ µÉ ¶§±îÁö ¼ºÇüÇÏ¿´´Ù. ±â±¸ »ç¿ë Àü°ú ÈÄ ±Ù°ü ¸ð¾çÀ» µðÁöÅÐ ¿µ»óÀ» ±â·ÏÇÏ¿´°í, ÄÄÇ»ÅÍ ¿µ»ó ºÐ¼® ÇÁ·Î±×·¥(Expression Scanner¿Í Adobe Photoshop CS)À¸·Î Æò°¡ÇÏ¿´´Ù. ´ÙÀ½°ú °°Àº °á·ÐÀ» ¾ò¾ú´Ù. ±Ù÷À¸·ÎºÎÅÍ 1, 2, 3, 4, 5, 6, 7 mm ¶³¾îÁø ºÎÀ§ÀÇ ³»Ãø°ú ¿ÜÃøÀ¸·Î »èÁ¦µÈ ·¹Áø ¾çÀ» ÃøÁ¤ÇÏ¿´°í, ÀÚ·á´Â SPSS¹ýÀ¸·Î ºñ±³ ºÐ¼®ÇÏ¿´´Ù. 1. ±Ù°üÇü¼º ½Ã°£Àº Mtwo°¡ 84.50ÃÊ·Î °¡Àå ª¾ÒÀ¸¸ç, ÃÑ ÀÛ¾÷½Ã°£Àº K3°¡ 269.37ÃÊ·Î °¡Àå ±æ¾ú´Ù(p < 0.05). 2. ±â±¸ÀÇ º¯Çü°ú ÆÄÀýÀº ¸ðµç ±¸µ¿Çü NiTi ÆÄÀÏ¿¡¼­ ¹ß»ýÇÏÁö ¾Ê¾Ò´Ù. 3. ±Ù°ü ³»Ãø Æø°æÀÇ º¯È­´Â ProfileÀÌ 1, 2 mm ºÎÀ§¸¦ Á¦¿ÜÇÑ ´Ù¸¥ ºÎÀ§¿¡¼­ °¡Àå Àû¾úÀ¸¸ç, ProTaper UniversalÀº ¸ðµç ºÎÀ§¿¡¼­ °¡Àå ¸¹¾Ò´Ù(p < 0.05). 4. ±Ù°ü ¿ÜÃø Æø°æÀÇ º¯È­´Â MtwoÀÌ 1 mm ºÎÀ§¸¦ Á¦¿ÜÇÑ ¸ðµç ºÎÀ§¿¡¼­ °¡Àå Àû¾úÀ¸¸ç, ProfileÀº 3, 4 mm ºÎÀ§¿¡¼­ °¡Àå ¸¹¾Ò´Ù(p < 0.05). ProTaper Universal¿Í K3´Â 1, 2, 6, 7 mm ºÎÀ§¿¡¼­ °¡Àå ¸¹¾Ò´Ù(p < 0.05). 5. ±Ù°üÁ߽ɺ¯À§À²(centering ratio)Àº ProfileÀÌ 1, 4, 5, 6 mm ºÎÀ§¿¡¼­ °¡Àå Àû¾ú´Ù(p < 0.05). ÀÌ»óÀÇ °á°ú, ±¸µ¿¼º NiTi ÆÄÀÏÀ» ÀÌ¿ëÇÑ ¸¸°î ±Ù°üÀÇ ±Ù°üÇü¼ºÀº Ä¡°æºÎ´Â ProTaper¿Í °°Àº »èÁ¦·ÂÀÌ ³ôÀº ÆÄÀÏÀ» »ç¿ëÇÏ´Â °ÍÀÌ ±Ù°ü ÀÔ±¸¸¦ È¿°úÀûÀ¸·Î ³ÐÈ÷°í ´õ ³ªÀº taper¸¦ Çü¼ºÇϸç, ±Ù´ÜºÎ´Â Profile°ú °°Àº ±Ù°ü Á᫐ º¯À§°¡ ÀûÀº ÆÄÀÏÀ» »ç¿ëÇÏ´Â °ÍÀÌ ±Ù°üÇü¼º ½Ã°£À» ´ÜÃàÇÏ°í ±Ù´ÜºÎÀÇ ±Ù°ü º¯Çü(transportation)À» ÁÙÀÏ ¼ö ÀÖ´Ù°í ÆǴܵȴÙ.

The purpose of this study was to compare the root canal shaping ability of 4 rotary NiTi instruments in simulated root canals. For the preparation of thirty two curved root canals, Mtwo instruments using "single length"technique, and Profile, ProTaper Universal, and K3 using crown-down technique (N = 8) were used. All canal samples were prepared by reaching an apical canal size of #30. Pre- and post-instrumentation digital images were recorded and an assessment of canal shape was determined using a computer image analysis program SigmaScan Pro (Systat Software Inc., San Jose, CA, USA). The changes of the dimension of inner walls of canals, (2) the changes of the dimension of outer walls of canals, and (3) the centering ratio were measured at 7 measuring points, and then data were statistically analyzed using one-way ANOVA and Duncan¡¯s test. The results were as below; 1. The root canal shaping ability of Profile was significantly faster than that of other rotary NiTi instruments (p < 0.05). 2. The deformation and fracture of all instruments used for this study were not experienced. 3. In the degree of changes of the dimension of inner walls of canals, Profile demonstrated the lowest changes of the dimension of inner walls of canals except at the measuring points of the 1 and 2 mm (p < 0.05). However, the ProTaper Universal showed the highest changes of the dimension of inner walls of canals at all measuring points (p < 0.05). 4. In the degree of changes of the dimension of outer walls of canals, Mtwo demonstrated the lowest changse of the dimension of outer walls of canals except at the measuring point of the 1 mm (p < 0.05). However, Profile exhibited the highest changes of the dimension of outer walls of canals at the measuring points of 3 and 4 mm and ProTaper Universal and K3 showed the largest changes of the dimension of outer walls of canals at the measuring points of 1, 2, 6, and 7 mm (p < 0.05). 5. In degree of centering ratio, Profile demonstrated the least centering ratio comparing with the centering ratio shown by other NiTi instruments at the measuring points of 1, 4, 5, and 6 mm. Results suggest that in the coronal part of canal preparation, active cutting files such as ProTaper Universal may efficiently flare the canal orifice and form a better taper, and in the apical part of the canal, files which have a better centering ability such as Profile may maintain the original canal curvature and reduce the shaping time.

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¿£Áø±¸µ¿Çü;NiTi ÆÄÀÏ;±Ù°ü¼ºÇü ´É·Â
Rotary file;Ni-Ti file;Shaping ability

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