만곡된 레진 모형 근관에서 4종의 엔진 구동형 니켈-티타늄 기구의 근관 중심율 유지 능력 The instrument-centering ability of four Nickel-Titanium instruments in simulated curved root canals원문보기
본 연구의 목적은 새로 시판된 NRT 기구의 근관 형태 유지 능력을 기존의 3종의 기구와 비교하는 것이다. 만곡된 레진 모형 근관을 ProFile, K3, ProTaper, NRT 기구를 이용하여 형성하였고 형성 전, 후의 상을 스캔한 후 중첩시켜 이미지 분석 프로그램을 이용하여 근관 만곡도의 변화와 근관 중심축에 대한 근관의 변이 정도를 근관 중심율의 변화로 계산하여 분석하였다. 근관 변이의 유의성 검정을 위해 one-way ANOVA분석을 시행하였으며 각 기구간의 유의성 검정은 Duncan's test로 사후 분석하였다. 근첨에서 1, 2 mm 상방 위치에서의 근관 중심율은 ProFile 군이 다른 군에 비해 우수한 것으로 나타났다. (p < 0.05). NRT기구의 근관 중심율 변화를 측정한 결과 근첨으로부터 5 mm 상방에서는 Profile에 비해서만 큰 것으로 나타났고 6, 7 mm 상방에서는 다른 모든 군들에 비해 큰 것으로 나타났다 (p < 0.05). 비록 NRT기구가 근첨 부위에서는 ProFile을 제외한 다른 기구에 비해 유의차 없는 중심률 유지 능력을 보였으나 근관 입구 및 중간부위의 형성에 사용되는 스테인레스-스틸 파일로 인해 coronal flaring시 다른 기구들에 비해 더 많은 중심률의 변화를 보이는 것으로 사료된다.
본 연구의 목적은 새로 시판된 NRT 기구의 근관 형태 유지 능력을 기존의 3종의 기구와 비교하는 것이다. 만곡된 레진 모형 근관을 ProFile, K3, ProTaper, NRT 기구를 이용하여 형성하였고 형성 전, 후의 상을 스캔한 후 중첩시켜 이미지 분석 프로그램을 이용하여 근관 만곡도의 변화와 근관 중심축에 대한 근관의 변이 정도를 근관 중심율의 변화로 계산하여 분석하였다. 근관 변이의 유의성 검정을 위해 one-way ANOVA분석을 시행하였으며 각 기구간의 유의성 검정은 Duncan's test로 사후 분석하였다. 근첨에서 1, 2 mm 상방 위치에서의 근관 중심율은 ProFile 군이 다른 군에 비해 우수한 것으로 나타났다. (p < 0.05). NRT기구의 근관 중심율 변화를 측정한 결과 근첨으로부터 5 mm 상방에서는 Profile에 비해서만 큰 것으로 나타났고 6, 7 mm 상방에서는 다른 모든 군들에 비해 큰 것으로 나타났다 (p < 0.05). 비록 NRT기구가 근첨 부위에서는 ProFile을 제외한 다른 기구에 비해 유의차 없는 중심률 유지 능력을 보였으나 근관 입구 및 중간부위의 형성에 사용되는 스테인레스-스틸 파일로 인해 coronal flaring시 다른 기구들에 비해 더 많은 중심률의 변화를 보이는 것으로 사료된다.
The aim of this study was to evaluate the ability of newly marketed NRT instruments to maintain the original root canal configuration and curvature during preparation in comparison with the three existing instruments in simulated root canals. Simulated canals in resin blocks were prepared with ProFi...
The aim of this study was to evaluate the ability of newly marketed NRT instruments to maintain the original root canal configuration and curvature during preparation in comparison with the three existing instruments in simulated root canals. Simulated canals in resin blocks were prepared with ProFile. K3, ProTaper and NRT instrument (n = 10 canals in each case). Pre- and post-operative images were recorded, and assessment of canal shape was completed with a computer image analysis program. The data were analyzed statistically using the One-way ANOVA followed by Duncan s test. The ability or instruments to remain centered in prepared canals at 1-, 2-mm levels was significantly better in ProFile groups than in other groups (p < 0.05). The change of centering ratio in NRT groups at 5-mm level was significantly greater than ProFile group and at 6- and 7-mm level than all other groups (p < 0.05). Although the NRT system was comparable to other systems in regards to its ability to maintain the canal configuration of apical portion, this system was more influenced by the mid-root curvature due to its stainless-steel files for coronal preflaring.
The aim of this study was to evaluate the ability of newly marketed NRT instruments to maintain the original root canal configuration and curvature during preparation in comparison with the three existing instruments in simulated root canals. Simulated canals in resin blocks were prepared with ProFile. K3, ProTaper and NRT instrument (n = 10 canals in each case). Pre- and post-operative images were recorded, and assessment of canal shape was completed with a computer image analysis program. The data were analyzed statistically using the One-way ANOVA followed by Duncan s test. The ability or instruments to remain centered in prepared canals at 1-, 2-mm levels was significantly better in ProFile groups than in other groups (p < 0.05). The change of centering ratio in NRT groups at 5-mm level was significantly greater than ProFile group and at 6- and 7-mm level than all other groups (p < 0.05). Although the NRT system was comparable to other systems in regards to its ability to maintain the canal configuration of apical portion, this system was more influenced by the mid-root curvature due to its stainless-steel files for coronal preflaring.
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문제 정의
The aim of this study was to determine the shaping ability of NRT instruments in comparison with the 3 existing instruments in simulated root canals under controlled laboratory conditions.
제안 방법
The change of canal curvature was measured by the Schneider method5). The ability of instruments to remain centered in the canal was determined by calculating a centering ratio after perpendicular lines were made from the canal axes at 1-, 2-, 3-, 4-, 5-, 6-, and 7-硕 levels from the working length with Image analyzer (Figure 1). Observing and measuring the original canals position in the canals instrumented, the centering ratio was calculated by the formula (X1-X2)/Y [X1 represents the maximum extent of canal movement in one direction and X2 is the movement in the opposite direction.
The purpose of this study is to determine the shaping ability of newly marketed NRT instruments in comparison with the 3 existing instruments, ProFile (Dentsply-Maillefer, Ballaigues, Switzerland), K3 (SybronEndo, West Collins, CA, USA), ProTaper (Dentsply-Maillefer, Ballaigues, Switzerland) in simulated root canals.
대상 데이터
A total of forty simulated curved root canals in clear resin blocks (Dentsply-Maillefer, Ballaigues, Switzerland) were used for this study. An apical foramen size of 0.
15 川m was confirmed, and each canal had a mean canal length of 17 硕.The blocks were divided into 4 groups according to the instruments used: ProFile, K3, ProTaper and NRT. Aqueous red ink was injected into the canals to enhance the image contrast.
데이터처리
Following error and range checks, the data were analyzed using SPSS, statistical analysis program. Change of canal curvature and differences of centering ratio at the 7 measuring points were statistically analyzed using One-way ANOVA followed by Duncan’s test.
file. Following error and range checks, the data were analyzed using SPSS, statistical analysis program. Change of canal curvature and differences of centering ratio at the 7 measuring points were statistically analyzed using One-way ANOVA followed by Duncan’s test.
이론/모형
, USA), the post-operative canal images were superimposed over the pre-operative images by superposing the three dots selected in the preand post-instrumented images at the same positions. The change of canal curvature was measured by the Schneider method5). The ability of instruments to remain centered in the canal was determined by calculating a centering ratio after perpendicular lines were made from the canal axes at 1-, 2-, 3-, 4-, 5-, 6-, and 7-硕 levels from the working length with Image analyzer (Figure 1).
성능/효과
05). The change of centering ratio in NRT groups at 5-硕 level was significantly greater than ProFile group and at 6- and 7-川m level than all other groups (p< 0.05, Table 2).
참고문헌 (15)
AI-Omari MAO, Dummer PMH. Newcombe RG. Comparison of six files to prepare simulated root canals. Part 2. Int Endod J 25:67-81, 1992
Schafer E, Tepel J. Hoppe W. Properties of endodontic hand instruments used in rotary motion. Part 2. Instrumentation of curved canals. J Endod 21 :493-497. 1995
Peters OA. Schonenberger K, Laib A. Effects of four Ni-Ti preparation techniques on root canal geometry assessed by micro computed tomography. Int Endod J 34:221-230, 2001
Berutti E. Chiandussi G, Gaviglio I. Ibba A. Comparative analysis of torsional and bending stresses in two mathematical models of nickel-titanium rotary instruments: ProTaper versus ProFile. J Endod 29: 1519, 2003
Yoshimine Y. Ono M. Akamine A. The shaping effects of three nickel-titanium rotary instruments in simulated S-shaped canals. J Endod 31:373-375, 2005
Yun HH, Kim SK. A comparison of the shaping abilities of 4 nickel-titanium rotary instruments in simulated root canals. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 95: 228-233, 2003
Guelzow A. Stamm O. Martus P, Kielbassa AM. Comparative study of six rotary nickel-titanium systems and hand instrumentation for root canal preparation. Int Endod J 743-752. 2005
Iqbal MK, Firic S, Tulcan J. Karabucak B. Kim S. Comparison of apical transportation between ProFile and ProTaper NiTi rotary instruments. Int Endod J 37:359-364, 2004
Davis RD, Marshall JG. Baumgartner JC. Effect of early coronal flaring on working length change in curved canals using rotary nickel-titanium versus stainless steel instruments. J Endod 28:438-442, 2002
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