• Title/Summary/Keyword: 기구

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기체절연파괴기구에 대하여

  • 오철한
    • 전기의세계
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    • v.27 no.4
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    • pp.3-6
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    • 1978

  • (차례) 1.기체방전형식의 분류 2.기체방전기구 (1)Streamer (Primary와 Secondary) (2)Leader (3)Return Stroke와 Spark 3.문제점

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통계자료

  • Korea Electronics Association
    • Journal of Korean Electronics
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    • v.2 no.5
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    • pp.91-127
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    • 1982

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The instrument-centering ability of four Nickel-Titanium instruments in simulated curved root canals (만곡된 레진 모형 근관에서 4종의 엔진 구동형 니켈-티타늄 기구의 근관 중심율 유지 능력)

  • Ku, Jae-Hoon;Chang, Hoon-Sang;Chang, Seok-Woo;Cho, Hwan-Hee;Bae, Ji-Myung;Min, Kyung-San
    • Restorative Dentistry and Endodontics
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    • v.31 no.2
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    • pp.113-118
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    • 2006

  • 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.

  • https://doi.org/10.5395/JKACD.2006.31.2.113 인용 PDF KSCI