• 제목/요약/키워드: Evaluation of adjacent

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Radiographic evaluation before surgical extraction of impacted third molar to reduce the maxillary sinus related complication

  • Mi Hyun Seo;Buyanbileg Sodnom-Ish;Mi Young Eo;Hoon Myoung;Soung Min Kim
    • Journal of the Korean Association of Oral and Maxillofacial Surgeons
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    • 제49권4호
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    • pp.192-197
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    • 2023
  • Objectives: Surgical extraction of maxillary third molars is routine in departments devoted to oral and maxillofacial surgery. Because maxillary third molars are anatomically adjacent to the maxillary sinus, complications such as oroantral fistula and maxillary sinusitis can occur. Here we explore the factors that can cause radiographic postoperative swelling of the maxillary sinus mucosa after surgical extraction. Materials and Methods: This retrospective study reviewed the clinical records and radiographs of patients who underwent maxillary third-molar extraction. Preoperative panoramas, Waters views, and cone-beam computed tomography were performed for all patients. The patients were divided into two groups; those with and those without swelling of the sinus mucosa swelling or air-fluid level in a postoperative Waters view. We analyzed the age and sex of patients, vertical position, angulation, number of roots, and relation to the maxillary sinus between groups. Statistical analysis used logistic regression and P<0.05 was considered statistically significant. Results: A total of 91 patients with 153 maxillary third molars were enrolled in the study. Variables significantly related to swelling of the maxillary sinus mucosa after surgical extraction were the age and the distance between the palatal cementoenamel junction (CEJ) and the maxillary sinus floor (P<0.05). Results of the analysis show that the relationship between the CEJ and sinus floor was likely to affect postoperative swelling of the maxillary sinus mucosa. Conclusion: Maxillary third molars are anatomically adjacent to the maxillary sinus and require careful handling when the maxillary sinus is pneumatized to the CEJ of teeth.

Evaluation of Morphological Changes in Degenerative Cartilage Using 3-D Optical Coherence Tomography

  • Youn, Jong-In
    • Journal of the Optical Society of Korea
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    • 제12권2호
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    • pp.98-102
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    • 2008
  • Optical Coherence Tomography (OCT) is an important noninvasive medical imaging technique that can reveal subsurface structures of biological tissue. OCT has demonstrated a good correlation with histology in sufficient resolution to identify morphological changes in articular cartilage to differentiate normal through progressive stages of degenerative joint disease. Current OCT systems provide individual cross-sectional images that are representative of the tissue directly under the scanning beam, but they may not fully demonstrate the degree of degeneration occurring within a region of a joint surface. For a full understanding of the nature and degree of cartilage degeneration within a joint, multiple OCT images must be obtained and an overall assessment of the joint surmised from multiple individual images. This study presents frequency domain three-dimensional (3-D) OCT imaging of degenerative joint cartilage extracted from bovine knees. The 3-D OCT imaging of articular cartilage enables the assembly of 126 individual, adjacent, rapid scanned OCT images into a full 3-D image representation of the tissue scanned, or these may be viewed in a progression of successive individual two-dimensional (2-D) OCT images arranged in 3-D orientation. A fiber-based frequency domain OCT system that provides cross-sectional images was used to acquire 126 successive adjacent images for a sample volume of $6{\times}3.2{\times}2.5\;mm^3$. The axial resolution was $8\;{\mu}m$ in air. The 3-D OCT was able to demonstrate surface topography and subsurface disruption of articular cartilage consistent with the gross image as well as with histological cross-sections of the specimen. The 3-D OCT volumetric imaging of articular cartilage provides an enhanced appreciation and better understanding of regional degenerative joint disease than may be realized by individual 2-D OCT sectional images.

머리의 위치변화에 따른 파노라마방사선 사진상에서의 상악동 및 인접조직의 평가 (EVALUATION OF THE MAXILLARY SINUS AND ADJACENT STRUCTURES ON THE ORTHOPANTOMOGRAPH ACCORDING TO THE HEAD POSITIONS)

  • 이진경;김재덕
    • 치과방사선
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    • 제22권2호
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    • pp.315-327
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    • 1992
  • The purpose of this study was to evaluate the utilization of the orthopantomograph as a diagnostic aid to observe maxillary sinus and adjacent structures. For achieving this goal. the lead plates were attached to the five walls of the maxillary sinus of a human dry skull. The dry skull was placed in fourteen different positions; standard. 20mm forward. 20mm backward. 10 degree upward. 10 degree downward. 20mm lateral. forward & upward, forward & downward. forward & lateral. backward & upward. backward & downward, backward & lateral. upward & lateral. downward & lateral position. The obtained results were as follows: 1. The image of the medial wall was observed very differently according to the head positions. 2. The image of the anterior wall was observed at medial third to half of the maxillary sinus in each head position. 3. the image of the posterior wall was always observed at lateral third of the maxillary sinus in all head positions and more obviously in the downward-lateral position. 4. The image of the superior wall was observed at the inferior third to half of the orbit in each head position. 5. The image of the inferior wall was always observed at the inferior third of maxillary sinus in all head positions and observed more obviously in the standard and downward-lateral positions. 6. The images of the zygomatic process. zygomatic arch and zygomaticotemporal suture were observed very well in the downward-lateral position.

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재발성 장중첩증 환아에서 병적 선두로 확인된 장중복 낭종 1예 (A Case of Intestinal Duplication Cyst Identified as Pathological Lead Point in a Child with Recurrent Intussusception)

  • 이건송;박지윤;오종석;성인창;한강민;이영석
    • Pediatric Gastroenterology, Hepatology & Nutrition
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    • 제13권1호
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    • pp.75-80
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    • 2010
  • 장중첩증이 재발한 15개월 여아에서 초음파 검사에서 병적 선두로 생각되는 낭성 종괴를 확인하였고 이중벽 징후와 인접한 소장 사이에 Y자 형상의 저반향 경계를 가지고 있어 중복 낭종으로 의심하였다. 이후 절제술을 시행하여 조직병리검사에서 인접한 회장과 근육층을 공유하고 낭종의 바깥쪽으로는 인접한 장 점막상피 조직과 안쪽으로는 이소성 위 점막 조직이 관찰되는 중복 낭종으로 확진되어 문헌 고찰과 함께 보고하는 바이다.

액정 디스플레이의 동화상 퍼짐 노이즈 특성 평가 (Characteristics Evaluation of Moving Picture Blur Noise for Liquid Crystal Display)

  • 염정덕
    • 조명전기설비학회논문지
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    • 제23권1호
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    • pp.27-35
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    • 2009
  • LCD의 동화상 퍼짐(blur) 노이즈를 측정하고 그 특성을 평가하였다. 실험결과, 퍼짐 노이즈는 시선이 동화상을 추적하면서 이동할 경우에 발생하며 시선이 고정되어 있을 경우에는 발생하지 않았다. 그리고 화상 퍼짐에 의한 계조 감소는 선형적이며 속도 의존성이 있었다. 이 실험결과를 근거로 한 퍼짐 노이즈 시뮬레이터를 개발하고 퍼짐 노이즈를 시뮬레이션 한 결과, 화상의 이동속도가 빠를수록 퍼짐 노이즈가 증가하였으며 이것은 측정결과와도 일치하였다. 백라이트 점등비 제어에 의한 퍼짐 노이즈 특성을 시뮬레이션 한 결과, 점등비가 낮을수록 노이즈가 저감되나 백라이트의 점등 타이밍이 2개의 인접한 프레임에 걸쳐서 있으면 오히려 노이즈가 심해졌다. 또한 프레임을 120[Hz]로 배속시켜 구동하는 경우에는 기존의 두 화상 사이에 새로운 화상이 생김으로써 얻는 화상 이동속도의 감소가 퍼짐 노이즈를 저감시켰다.

강우 발생에 따른 남해군 봉천 방출수가 강진만 해역의 세균학적 수질에 미치는 영향 평가 (Evaluation of the Effect of the Discharged Water from Bong Stream after Rainfall Events on the Bacteriological Water Quality in Gangjinman, Korea)

  • 박큰바위;조미라;이희정;권지영;손광태;이태식
    • 한국수산과학회지
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    • 제44권6호
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    • pp.622-629
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    • 2011
  • We investigated the effect of the discharged water from Bong Stream, which is located in the drainage area of Gangjinman area on the bacteriological water quality in the coastal area after rainfall events. Following 12.5 mm of rainfall, water discharged from Bong Stream had a very limited effect on bacteriological water quality in adjacent area and the affected area did not extend to the designated area. On the other hand, after 23 mm rainfall, the density of fecal coliform at stations located in the designated area was higher than at stations located in the adjacent area. The degree of bacteriological contamination at the surveyed stations in the coastal area after rainfall events did not show a relationship with distance from the shoreline. These results indicate that the direction of spread and the range of contaminants from the drainage area were affected by tides at the time of the survey. Therefore, a detailed survey of the effects of tides on the diffusion characteristics of the contaminants from Bong Stream is needed to establish a proper management plan for the surveyed area.

산업용 냉각탑의 진동소음이 정밀장비에 미치는 영향에 대한 연구 (An Investigation on Influence of Vibration Noise in Cooling Tower on Precision Equipments)

  • 이진갑
    • 한국산학기술학회논문지
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    • 제17권9호
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    • pp.369-374
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    • 2016
  • 냉각탑은 옥탑이나 건물 외부에 설치하여, 실내의 온도제어를 위해 사용된다. 냉각탑의 운전시 모터, 팬 및 낙하되는 냉각수에서 발생되는 소음 진동은 주변으로 전파가 용이하여, 인접한 건물 내부의 소음 진동 문제를 야기할 수 있다. 본 논문은 공장에 인접해 위치한 산업용 냉각탑의 진동 소음을 측정하여, 공장 내부의 정밀장비에 미치는 영향을 평가하였다. 정상 운전조건에서의 냉각탑의 소음을 측정하고, 냉각탑에서 일정거리 떨어진 공장의 바닥과 공장 내부에 위치한 정밀장비를 대상으로 진동을 측정하여, 냉각탑과 정밀기계의 진동 소음 평가기준에 의해 냉각탑의 진동 소음이 정밀장비의 정밀도에 미치는 영향을 분석하였다. 측정결과 냉각탑의 소음은 동일 용량 냉각탑의 기준 소음치인 68dB(A)보다 4~9dB(A) 높다. 냉각탑의 진동이 정밀장비에 미치는 영향은 냉각탑이 위치하는 건물 지지 프레임의 진동이 정밀장비가 위치한 바닥의 진동보다 낮아 영향은 미미하다. 정밀장비가 위치한 실내 바닥은 진폭은 허용기준치 안에 들어가나 진동 가속도 레벨 기준으로는 높게 나타났다.

경부에 발생한 낭포성 활액종의 증례보고 (A CASE REPORT OF CYSTIC HYGROMA IN THE NECK)

  • 박창서;신인숙;조정신;이장렬
    • 치과방사선
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    • 제23권1호
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    • pp.159-164
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    • 1993
  • Cystic hygroma is a special form of lymphangioma. It most often occurs in the neck of children. We observed a 14-year-old male whose chief complaint was a abnormal swelling of the right mandibular angle area. The computerized tomography showed the well-defined nonenhancing cystic mass on right submandibular gland area and anterior triangle of the neck. The histopathologic fidings exhibited the multiloculatedfluid-filled cysts, which are lined a flattened layer of endothelial cells with foci of lymphocytes found lying adjacent to the lining. After evaluation of above findings, the mass was diagnosed as a cystic hygroma in the neck.

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Evaluation of long term shaft resistance of the reused driven pile in clay

  • Cui, Jifei;Rao, Pingping;Wu, Jian;Yang, Zhenkun
    • Geomechanics and Engineering
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    • 제29권2호
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    • pp.171-182
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    • 2022
  • Reusing the used pile has not yet been implemented due to the unpredictability of the bearing capacity evolution. This paper presents an analytic approach to estimate the sides shear setup after the dissipation of pore pressure. Long-term evolution of adjacent soil is simulated by viscoelastic-plastic constitutive model. Then, an innovative concept of quasi-overconsolidation is proposed to estimate the strength changes of surrounding soil. Total stress method (α method) is employed to evaluate the long term bearing capacity. Measured data of test piles in Louisiana and semi-logarithmic time function are cited to validate the effectiveness of the presented method. Comparisons illustrate that the presented approach gives a reasonably prediction of the side shear setup. Both the presented method and experiment show the shaft resistance increase by 30%-50%, and this highlight the potential benefit of piles reutilization.

Estimation of structural dynamic characteristics of the Egyptian Obelisk of Theodosius

  • Saygili, Ozden
    • Earthquakes and Structures
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    • 제16권3호
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    • pp.311-320
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    • 2019
  • Obelisks are historical monuments. There are several obelisks dating from ancient Egyptian period, located around various parts of the world. The city of Istanbul is a home to the Obelisk of Theodosius at the Hippodrome. Due to the expectation of a large event in the near future, the evaluation of seismic response of the Obelisk gets importance. Therefore, in this study structural dynamic behavior of the Obelisk was investigated using discrete element approach. Nonlinear dynamic analyses were performed using real and synthetic time series. Real and synthetic ground motions analyzed from this study seems consistent with the earthquake hazard levels that would be expected at the site of the Obelisk in the occurrence of an event of moment magnitude above 7.0 near Istanbul. Results are evaluated in terms of variation of displacement, relative displacement of adjacent blocks, normal stress and shear stress in time.