구강회복응용과학지 (Journal of Dental Rehabilitation and Applied Science)

  • 제28권1호
  • /
  • Pages.57-66
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  • 2012
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  • 2384-4353(pISSN)
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  • 2384-4272(eISSN)
대한턱관절교합학회 (Korean Academy of Stomatognathic Function and Occlusion)
권호 표지

ProTaper Universal에 축적된 내부 응력이 피로 파절에 미치는 영향

Effect of Internal Stress on Cyclic Fatigue Failure in ProTaper Universal

  • 조윤성 (강릉원주대학교 치과대학 치의학과 치과보존학교실) ;
  • 김진우 (강릉원주대학교 치과대학 치의학과 치과보존학교실) ;
  • 조경모 (강릉원주대학교 치과대학 치의학과 치과보존학교실) ;
  • 박세희 (강릉원주대학교 치과대학 치의학과 치과보존학교실)
  • Jo, Yun-Sung (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry) ;
  • Kim, Jin-Woo (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry) ;
  • Cho, Kyung-Mo (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry) ;
  • Park, Se-Hee (Department of Conservative Dentistry, Gangneung-Wonju National University, School of Dentistry)
  • 투고 : 2011.12.23
  • 심사 : 2012.03.25
  • 발행 : 2012.03.30
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초록

본 연구는 ProTaper Universal에 의도적으로 부여한 내부 응력이 피로 파절에 미치는 영향을 평가하였다. 25 mm 길이의 S1, S2, F1, F2, F3, F4 그리고 F5 파일을 내부 응력을 부여하기 위해서 Endo-Training-Bloc (Dentsply Maillefer)에 auto-stop 될 때까지 속도 300 rpm, 토크 1.0 Ncm의 값으로 밀어 넣었다. 부여한 내부 응력의 횟수에 따라 각각 Stress 0 군(대조군), Stress 1 군, Stress 2 군 그리고 Stress 3 군으로 분류하였다. 경사진 유리판을 사용하였고 파일 파절 시간을 측정하였다. 모든 파일에서는 Stress 3 군은 대조군에 비해 Ni-Ti 파일의 파절 시간이 감소하였고 F2와 F3에서 모든 실험군은 대조군에 비해 파절 시간이 감소하였다. F4와 F5에서 Stress 2 군과 Stress 3 군이 대조군에 비해 파절 시간이 감소하였다. ProTaper Universal의 피로 파절은 파일에 축적된 내부 응력에 의해 영향을 받는다.

The purpose of this study was to evaluate the relation between intentionally induced internal stress and cyclic fatigue failure of ProTaper Universal. ProTaper Universal (Dentsply Maillefer) S1, S2, F1, F2, F3, F4 and F5 (25 mm length) were used in this study. To give the internal stress, the ProTaper Universal were put into the .02 taper Endo-Training-Bloc (Dentsply Maillefer) until auto-stop by torque controlled motor. The rotation speed was 300 rpm and torque value was 1.0 Ncm. ProTaper Universal were grouped by the induced number of internal stress and randomly distributed among one control group and three experimental groups (n=10). The four groups were Stress 0 (control), Stress 1, Stress 2 and Stress 3. These instruments were rotated until separation. For cyclic fatigue measurement, inclined plane was used and time for separation was recorded. It was statistically analyzed using two-way ANOVA and Duncan post-hoc test at 95% confidential level. In all ProTaper Universal, there was statistically significant decrease on time for separation in Stress 3. In F2 and F3, there were statistically significant difference between control group and all experimental groups. And in F4 and F5, Stress 2 and 3 groups showed significantly lower cyclic fatigue resistance from Stress 0 group. In the limitation of this study, cyclic fatigue failure of ProTaper Universal is influenced by accumulated internal stress.

키워드

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