Restorative Dentistry and Endodontics

The Korean Academy of Conservative Dentistry (대한치과보존학회)
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EFFECT OF VARIOUS CANAL PREPARATION TECHNIQUES USING ROTARY NICKEL-TITANIUM FILES ON THE MAINTENANCE OF CANAL CURVATURE

수종의 엔진구동형 Nickel-Titanium file을 이용한 근관형성 방법이 근관만곡도 유지능력에 미치는 영향

  • Lee, Cheol-Hwan (Dept. of Conservative Dentistry, College of Dentistry, Dankook University) ;
  • Cho, Kyung-Mo (Dept. of Conservative Dentistry, College of Dentistry, Kangnung University) ;
  • Hong, Chan-Ui (Dept. of Conservative Dentistry, College of Dentistry, Dankook University)
  • 이철환 (단국대학교 치과대학 보존학교실) ;
  • 조경모 (강릉대학교 치과대학 보존학교실) ;
  • 홍찬의 (단국대학교 치과대학 보존학교실)
  • Published : 2003.01.01
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Abstract

There are increasing usage of Nickel-Titanium rotary files in modern clinical endodontic treatment because it is effective and faster than hand filing due to reduced step. This study was conducted to evaluate the effect of canal preparations using 3 different rotary Nickel-Titanium files that has different cross sectional shape and taper on the maintenance of canal curvature. Simulated resin block were instrumented with Profile(Dentsply, USA), GT rotary files(Dentsply, USA), Hero 642(Micro-Mega France), and Pro-Taper(Dentsply, USA). The image of Pre-instrumentation and Post-instrumentation were acquired using digital camera and overspreaded in the computer. Then the total differences of canal diameter, deviation at the outer portion of curvature, deviation at the inner portion of curvature, movement of center of the canal and the centering ratio at the pre-determined level from the apex were measured. Results were statistically analyzed by means of ANOVA, followed by Scheffe test at a significance level of 0.05. The results were as follows； 1. Deviation at the outer portion of curvature, deviation at the inner portion of curvature were showed largest in Pro-Taper so also did in the total differences of canal diameter(p＜0.05). 2. All the groups showed movements of center Profile combined with GT rotary files and Hero 642 has no difference but Pro-Taper showed the most deviation(p＜0.05). 3. At the 1, 2, 3mm level from the apex movements of center directed toward the outer portion of curvature, but in 4, 5 mm level directed toward the inner portion of curvature(p＜0.05). As a results of this study, it could be concluded that combined use of other Nickel-Titanium rotary files is strongly recommended when use Pro-Taper file because it could be remove too much canal structure and also made more deviation of canal curvature than others.

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  2. Effect of anticurvature filing method on preparation of the curved root canal using ProFile vol.30, pp.4, 2005, https://doi.org/10.5395/JKACD.2005.30.4.327
  3. Step by step analysis of root canal instrumentation with ProTaper® vol.31, pp.1, 2006, https://doi.org/10.5395/JKACD.2006.31.1.050
  4. A study of insertion depth of buchanan plugger after shaping using NI-TI rotary files in simulated resin root canals vol.31, pp.2, 2006, https://doi.org/10.5395/JKACD.2006.31.2.125
  5. Comparison of shaping ability using various Nickel-Titanium rotary files and hybrid technique vol.32, pp.6, 2007, https://doi.org/10.5395/JKACD.2007.32.6.530
  6. Stress distribution of three NiTi rotary files under bending and torsional conditions using a mathematic analysis vol.42, pp.1, 2009, https://doi.org/10.1111/j.1365-2591.2008.01481.x