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Relative efficacy of three Ni-Ti file systems used by undergraduates

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Abstract

ÀÌ ¿¬±¸ÀÇ ¸ñÀûÀº Ni-Ti fileÀ» »ç¿ëÇÑ °æÇèÀÌ ¾ø´Â ÇлýµéÀÌ ¼¼ Á¾·ù Ni-Ti file systemsÀ» »ç¿ëÇÏ¿´À» ¶§ ±Ù°ü Çü¼º È¿À²À» ºñ±³ÇÏ´Â °ÍÀÌ´Ù. Ni-Ti fileÀÇ »ç¿ë °æÇèÀÌ ¾ø´Â ºÎ»ê´ëÇб³ Ä¡°ú´ëÇÐ 4Çгâ Çлý 50¸íÀÌ ¼¼ Á¾·ùÀÇ Ni-Ti file system - $ProFile^{(R)}$ (PF : Dentsply Maillefer, Ballaigues, Switzerland), manual $ProTaper^{(R)}$ (MPT: Dentsply Maillefer, Ballaigues, Switzerland), rotary $ProTaper^{(R)}$ (RPT: Dentsply Maillefer, Ballaigues, Switzerland) -À» »ç¿ëÇÏ¿© °¢ systemÀ¸·Î ÇϳªÀÇ ±Ù°ü¾¿, ¸ðµÎ 150°³ÀÇ ·¹Áø ºí¶ô ±Ù°ü¸ðÇü(Endo Training Bloc; Dentsply Maillefer, Ballaigues, Switzerland)À» Çü¼ºÇÏ¿´´Ù. ±Ù°üÇü¼º¿¡ »ç¿ëµÈ fileÀÇ ÆÄÀýÀ̳ª º¯Çü ¹× ±Ù°üÇü¼º ÈÄ ÇüÅÂÀÇ ÀÌ»óÀ» Á¶»çÇÏ°í, ½ºÄ³³Ê·Î ±Ù°ü Çü¼º ÀüÈÄÀÇ À̹ÌÁö¸¦ äµæÇÏ¿© Áßø ºñ±³ÇÔÀ¸·Î½á ±Ù´ÜºÎ·ÎºÎÅÍ 1mm, 3mm, ±×¸®°í 5mm ³ôÀÌ¿¡¼­ÀÇ »èÁ¦µÈ ±Ù°üÀÇ Æø°æ, ±Ù°üÀÇ º¯À§·®, ±×¸®°í Á߽ɺ¯À§À² µîÀ» »êÃâÇÏ°í Åë°èÇÐÀû ºñ±³ ºÐ¼®À» ÇÏ¿´´Ù. ±×¸®°í ¼¼ °¡Áö systems¿¡ °üÇÑ ÇлýµéÀÇ ÁÖ°üÀûÀÎ ¼±È£µµ¸¦ Á¶»çÇÏ¿´´Ù. ±× °á°ú Á¹¾÷À» ¾ÕµÐ Ä¡°ú´ëÇÐ ÀçÇлýµéµµ Ưº°ÇÑ ¹®Á¦Á¡ ¾øÀÌ ¼¼ °¡Áö Ni-Ti file systemsÀ» »ç¿ëÇÑ ±Ù°üÇü¼ºÀÌ °¡´ÉÇÔÀ» È®ÀÎÇÏ¿´´Ù. ¼¼ ½ÇÇ豺À» ºñ±³ÇÏ¿´À» ¶§, ¾çÀûÀÎ »èÁ¦ ´É·ÂÀº µÎ $ProTaper^{(R)}$ systems (manual and rotary)ÀÌ $ProFile^{(R)}$¿¡ ºñÇØ ¿ì¼¼ÇÏ¿´Áö¸¸, ±Ù°üÀÇ º¯À§´Â µÎ $ProTaper^{(R)}$ systems¿¡¼­ ´õ ¸¹ÀÌ À¯¹ßµÇ¾ú´Ù. ±Ù°ü Á᫐ À̵¿·ü µîÀÇ ÁúÀû Æò°¡¸¦ Æ÷ÇÔÇÏ¿© ÇлýµéÀÇ ¼±È£µµ¸¦ Á¾ÇÕÀûÀ¸·Î °í·ÁÇÒ ¶§, »èÁ¦ ´É·Â¿¡ À־´Â rotary $ProTaper^{(R)}$°¡ ´õ È¿À²ÀûÀÌÁö¸¸ ¾ÈÀü¼ºÀ» °í·ÁÇϸé $ProFile^{(R)}$µµ ÃßõµÈ´Ù. Á¤±Ô ±³À°°úÁ¤¿¡¼­ Ni-Ti file systemsÀÇ µµÀÔÀ» À§Çؼ­ ÃʽÉÀÚ¿Í °ü·ÃÇÑ ´õ ¸¹Àº ¿¬±¸°¡ ÁøÇàµÇ¾î¾ß ÇÏ°Ú´Ù.

The purpose of this study was to compare and evaluate the shaping ability of the three different Ni-Ti file systems used by undergraduate students. Fifty undergraduate students prepared 150 simulated curved root canals in resin blocks with three Ni-Ti file systems - $ProFile^{(R)}$ (PF), Manual $ProTaper^{(R)}$ (MPT), Rotary $ProTaper^{(R)}$ (RPT). Every student prepared 3 simulated root canals with each system respectively. After root canal preparation, the Ni-Ti files were evaluated for distortion or breakage Assessments were made according to the presence of various types of canal aberrations. The pre- and post-instrumented canal images were attained and superimposed. The instrumented root canal width were measured and calculated for the net transportation (deviation) and the centering ratio. Under the condition of this study, both $ProTaper^{(R)}$ systems allowed significantly more removal of root canal wall than the $ProFile^{(R)}$ system. In the important other aspects such as the centering ratio, there was no significant differences between the systems. Novice dental students were able to prepare curved root canals with any kinds of Ni-Ti file systems with little aberration and great conservation of tooth structure. Students want to learn effective methods and at the same time simple rotary procedures. The rotary $ProTaper^{(R)}$ systems were one of the most compatible to these students from the point of view of cutting ability The $ProFile^{(R)}$ system was also compatible in safe and gentle shaping.

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