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• W2015761359 abstract "목적: 이 연구는 파노라마방사선사진 촬영 시 환자의 머리 위치가 상방, 하방, 좌측 및 우측으로 회전됨에 따른 수평 및 수직 확대율의 변화를 비교 평가하는 것이었다. 연구 재료 및 방법: 직경 4 mm인 금속구 5개를 건조 두개골의 하악 전치부(2개)와 우측 대구치부(3개)의 치조골 상방에 위치시켰다. 상하 및 좌우 회전량을 조절할 수 있는 두개골 고정장치에 건조 두개골을 고정시킨 후, 기준 위치와 회전된 위치에서 파노라마방사선사진을 쵤영하였다. 결과: 기준 위치에서 평균 수평 확대율은 <TEX>$1.22{pm}0.01-1.44{pm}0.01$</TEX>이었고, 평균 수직 확대율은 <TEX>$1.29{pm}0.00-1.35{pm}0.02$</TEX>였다. 전치부와 구치부 비교시 수평 확대율은 전치부에서 <TEX>$1.24{pm}0.02-1.31{pm}0.03$</TEX>, 구치부에서 <TEX>$1.40{pm}0.03-1.33{pm}0.02$</TEX>로 유의한 차이가 있었고(P < 0.05), 수직 확대율은 차이가 없었다. 위치 변화에 따른 수평 확대율은 <TEX>$0.88{pm}0.03-3.73{pm}0.16$</TEX>으로 기준 위치와 비교 시 통계적으로 유의한 차이를 보인 반면 (P < 0.05), 수직 확대율은 <TEX>$1.24{pm}0.01-1.37{pm}0.02$</TEX>로 차이가 없었다. 결론: 회전된 머리위치에서 파노라마방사선사진 촬영 시 수평 확대율의 변화가 크다. Purpose: The purpose of this study was to investigate the effect of head position changes on vertical and horizontal magnification in dental panoramic radiographs. Materials and Methods: Five 4 mm metal balls were placed above alveolar crest of dry skull considering extraction socket and dental arch. Panoramic radiographs were taken by OP-100D (Instrumentarium Imaging Co., Tuusula, Finland) at proper and rotated head position along the sagittal and transverse axis at 3 - <TEX>$20^{circ}$</TEX> upwardly, downwardly, to the left and to the right rotation. Images were stored in DICOM files and were measured by ruler equipped within INFINITT PACS software. Results: The mean horizontal magnification was <TEX>$1.22{pm}0.01-1.44{pm}0.01$</TEX> and mean vertical magnification was <TEX>$1.29{pm}0.00-1.35{pm}0.02$</TEX> at standard head position. There was statistical significance of horizontal magnification between the anterior (<TEX>$1.24{pm}0.02-1.31{pm}0.03$</TEX>) and the posterior area (<TEX>$1.40{pm}0.03-1.33{pm}0.02$</TEX>) (P < 0.05). Vertical magnification resulted in less variation (<TEX>$1.24{pm}0.01-1.37{pm}0.02$</TEX>) than horizontal magnification (<TEX>$0.88{pm}0.03-3.73{pm}0.16$</TEX>) according to the rotation. There was statistical significant difference on horizontal magnification (P < 0.05). Conclusion: In rotated head position, the horizontal magnification should be considered because these can cause distortion on panoramic radiographs." @default.
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• W2015761359 date "2014-03-31" @default.
• W2015761359 modified "2023-09-24" @default.
• W2015761359 title "Effect of head positioning on the vertical and horizontal magnification in panoramic radiographs: rotation along the sagittal and transverse plane" @default.
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• W2015761359 doi "https://doi.org/10.14368/jdras.2014.30.1.1" @default.
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