• Title/Summary/Keyword: Location analysis

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The vertical location of the center of resistance for maxillary six anterior teeth during retraction using three dimensional finite element analysis (상악 6전치부의 후방견인시 저항중심의 수직적 위치에 관한 3차원 유한요소법적 연구)

  • Lee, Hye-Kyoung;Chung, Kyu-Rhim
    • The korean journal of orthodontics
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    • v.31 no.4 s.87
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    • pp.425-438
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    • 2001

  • The delivery of optimal orthodontic treatment is greatly influenced by clinician's ability to predict and control tooth movement by applying well-known force system to dentition. It is very important to determine the location of the centers of resistance of a tooth or teeth in order to have better understanding the nature of displacement characteristics under various force levels. In this study, three dimensional finite element analysis was used to measure the initial displacement of the consolidated teeth under loading. The purpose of this study was to define the location of the centers of resistance at the upper six anterior segment. To observe the changes of six anterior segment, 200gm, 250gm, 300gm, and 350gm forces at right and left hand side each were imposed toward lingual direction. For this study, two cases, six anterior teeth and six anterior teeth after corticotomy, were reviewed. In addition, it was reviewed the effects of changes on the location of the center of resistance in both cases based on different degree of forces aforementioned. The results were that : 1. The instantaneous center of resistance for the six anterior teeth was vertically located between level 4 and level 5, which is, at 6.76mm, $44.32\%$ apical to the cementoenamel junction level. 2. The instantaneous center of resistance for the six anterior teeth after corticotomy was located vertically between level 4 and level 5, that is, at 7.09mm $46.38\%$ apical to the cementoenamel junction level. 3. Changes of force showed little effect on the location of the center of resistance in each case. 4. It was observed that the location of the instantaneous center of resistance for the six anterior teeth after corticotomy was changed more than the six anterior teeth without corticotomy to the apical part, and the displacement of the consolidated anterior teeth moved further in case of the consolidated teeth after corticotomy.

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The Analysis of the fault location measurement error by Digital Relay (디지털 보호계전기의 고장점 표정에 대한 오차 분석)

  • Kim, Ho-Pyo;Park, Eung-Ju
    • Proceedings of the KIEE Conference
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    • 2002.11b
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    • pp.312-314
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    • 2002

  • 송전선로에 고장발생시 해당선로에 취부된 디지털 보호계전기의 보조기능인 거리표정의 신뢰도를 확인하기 위하여 보호계전기 제작사, 고장종류, 계전기 TYPE별로 거리 표정결과와 실제 고장점과의 오차 등에 대하여 세부적으로 통계 분석을 실시 하였다.

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