• Imaging Science in Dentistry
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• 제44권3호
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• pp.185-191
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• 2014

Purpose: This study investigated the developmental stages of third molars in relation to chronological age and compared third molar development according to location and gender. Materials and Methods: A retrospective analysis of panoramic radiographs of 2490 patients aged between 6 and 24 years was conducted, and the developmental stages of the third molars were evaluated using the modified Demirjian's classification. The mean age, standard deviation, minimal and maximal age, and percentile distributions were recorded for each stage of development. A Mann-Whitney U test was performed to test the developmental differences in the third molars between the maxillary and mandibular arches and between genders. A linear regression analysis was used for assessing the correlation between the third molar development and chronological age. Results: The developmental stages of the third molars were more advanced in the maxillary arch than the mandibular arch. Males reached the developmental stages earlier than females. The average age of the initial mineralization of the third molars was 8.57 years, and the average age at apex closure was 21.96 years. The mean age of crown completion was 14.52 and 15.04 years for the maxillary and the mandibular third molars, respectively. Conclusion: The developmental stages of the third molars clearly showed a strong correlation with age. The third molars developed earlier in the upper arch than the lower arch; further, they developed earlier in males than in females.

• Neonatal Medicine
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• 제25권2호
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• pp.66-71
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• 2018

Purpose: Respiratory morbidity is the most common problem among neonates admitted to neonatal intensive care units. Therefore, the aim of this study was to make a differential diagnosis between transient tachypnea of the newborn (TTN), respiratory distress syndrome (RDS), and pneumonia through comparison of clinical features and test results. Methods: This retrospective study was conducted in 86 infants with TTN, RDS, or pneumonia. These were infants who had respiratory distress, were born after ${\geq}34$ weeks of gestation, and transferred to the neonatal intensive care unit of Kosin University Gospel Hospital between June 1, 2011 and June 30, 2016. Results: The numbers (percentage) of infants with TTN, RDS, and pneumonia were 51 (59.3%), 20 (23.3%), and 15 (17.4%), respectively. Late-preterm and early-term newborns accounted for 65.1% of the infants. Tachypnea was observed in 74.4% of the neonates. The median age at admission was 4 hours (0 to 116) after birth. The infants with RDS had significantly lower birth weights, pH levels, base excess and oxygen saturation levels at admission, longer duration of total ventilator therapy, and hospital stay than those in the other two groups. The infants with pneumonia showed significantly high initial high-sensitivity C-reactive protein levels and significant chest radiographic findings. Conclusion: Early differential diagnosis for TTN, RDS, and pneumonia is challenging because they show similar respiratory symptoms at an early stage. Clinical features and test results can be used to determine the etiology of respiratory distress and early antibiotic treatment.

• 한국임상수의학회지
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• 제25권4호
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• pp.303-306
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• 2008

Unknown age, spayed female mixed dog was presented with a severe lethargy. Radiography, ultrasonography, and blood screen test were performed to make a diagnosis. There were no specific radiographic findings. On the ultrasonography, small amount of ascites was found around gallbladder and hepatic vein was dilated approximately 6.1 mm. Blood screen test revealed a severe anemia. Result of heartworm ELISA kit was positive. At necropsy, parasites were in the left atrium, right ventricles, aorta, pulmonary artery, right renal artery.

• The Journal of Advanced Prosthodontics
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• 제6권1호
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• pp.53-59
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• 2014

PURPOSE. The aim of this study was to obtain statistical data on the residual bone height at different natural tooth positions by panoramic radiography in edentulous Korean patients aged 60-90 years. MATERIALS AND METHODS. The study included the diagnostic panoramic radiographs of 180 randomly selected edentulous patients without systemic diseases affecting bone. The radiographic selection criteria included absence of obvious facial asymmetry, clearly visible anatomic structures, and no surgical and fracture history. The panoramic radiographs of 79 patients met these criteria and were used in the analysis. The same researcher processed all the radiographs by using a standardized method. The height of the residual bone was measured at 18 predetermined sites (7 in the maxilla and 11 in the mandible) on digitized and printed radiographs by using a Digimatic caliper, triangle, and ruler. Gender- and age-related differences were statistically analyzed by using the t-test and rank-sum test (${\alpha}=0.05$). RESULTS. The maxillary residual bone height did not show significant gender-related differences, but male patients had significantly higher residual bone in the mandible(P<.05). No significant height differences at the measured sites were noted among the 60s, 70s, and 80s age groups. CONCLUSION. Dentists should pay greater attention to older female edentulous patients because they are more prone to rapid residual bone resorption. Residual bone resorption may not be affected by age.

• 한국융합학회논문지
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• 제8권1호
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• pp.51-59
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• 2017

본 연구는 종합병원 내 응급실에 설치된 CT 장비와 일반촬영장비에 대한 세균 오염도 검사를 실시하여 보건학적 융복합 감염관리에 대한 기초자료를 마련하고자 하였다. 연구는 2015년 12월 1일부터 12월 31일까지 수도권 3곳과 전라도 2곳, 충청도 2곳 등 총 7곳의 의료기관을 대상으로하였다. 영상의학과 응급실 내 CT장비의 검출된 표면 오염 균주는 Micrococcus species(4,5%), Stenotrophomonas maltophilia(9%), Enteococcus faecium(4.5%), Providencia stuartii(4.5), Gram negative bacilli(4.5%), 일반촬영장비에서 검출된 표면 오염 균주는 Providencia stuartii(11%), Klebsiella pneumonia(3.5%), Stenotrophomonas maltophilia(11%), Pantoea species(11%), Acinetobacter baumannii(3.5%), Micrococcus species(3.5%), Escherichia coli(3.5%), Enterobacter species(3.5%), Gram negative bacilli(11%) 로 병원 감염의 원인균으로 알려진 균주는 없었고, 특이성을 가진 균주 역시 없었지만 가장 많이 검출된 구역이 모두 환자와 밀접한 관련을 갖는 곳이므로 방사선사는 검사 전후 알코올 등으로 깨끗이 닦아내야 할 것이다.

• 대한치과보철학회지
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• 제57권3호
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• pp.219-224
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• 2019

목적:컴퓨터 가이드 임플란트 수술에서 방사선 영상과 디지털 영상과의 정합은 필수적인 과정이다. 본 연구의 목적은 마이크로스크류의 사용이 가이드 수술을 위한 영상정합 과정에서 작업시간과 술자편의성에 미치는 영향을 조사하는 것이다. 재료 및 방법: 연구모형의 제작을 위해 Kennedy class I 하악 덴티폼에 마이크로스크류 2개를 후구치 삼각 부위에 식립 후 컴퓨터 단층촬영과 디지털 스캔을 통해 방사선 영상과 스캔 영상을 획득하였다. 영상들은 잔존 치아 부위만을 이용하는 방법과 치아와 마이크로스크류를 이용하는 방법을 이용하여 12명의 술자에 의해 중첩되었다. 이 중첩된 영상에 대하여 작업시간, 술자편의성, 만족도의 자료가 수집되고, Mann-Whitney U test을 통해 분석되었다. 결과: 작업시간은 영상정합 조건 사이에 통계학적인 차이가 없었다 (P > .05). 술자편의성과 만족도는 치아와 마이크로스크류를 이용하는 방법에서 잔존 치아 부위만을 이용하는 방법보다 높았다 (P < .001). 결론: 영상정합에서 마이크로스크류의 이용은 작업시간의 단축에는 영향을 미치지 않지만 술자편의성과 만족도는 향상시킨다.

• 대한치과보철학회지
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• 제59권3호
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• pp.281-290
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• 2021

목적: 구치부 임플란트 식립을 위하여 발치와 치조제 보존술을 시행한 환자를 대상으로 임플란트 식립 직 후, 최종 보철물 장착 후 및 유지관리 기간에 따른 치조제 높이 변화량을 방사선학적으로 측정하여 임플란트 주위 골 변화를 평가하고자 하였다. 대상 및 방법: 치조제 보존술을 시행한 후 식립한 총 36개의 임플란트를 대상으로 각 시기에 촬영한 파노라마 방사선 사진을 이용하여 근·원심측의 치조제 높이를 각각 수직적 수치로 측정하였다. 환자의 연령, 성별, 전신질환, 임플란트 식립 위치, 골 이식재 유형, 차폐막 적용 방법, 술자의 숙련도, 측정 시기간의 치조제 높이 변화량은 평균, 표준편차를 구하였고, 치조제 높이 변화량과 각각의 요소들 간의 연관성은 독립표본 t검정, 기간별 측정한 치조제 높이 간의 연관성은 대응표본 t검정을 시행하였다(P < .05). 결과: 각 시기별 치조제 높이 변화량은 각각의 시기 사이에 모두 통계적으로 유의한 차이를 보였고(P < .05), 각 시기 간의 치조제 높이 변화량과 평가된 요소들은 통계적으로 유의한 연관성을 보이지 않았다. 결론: 발치와 치조제 보존술 후 식립된 임플란트 주위 골조직은 환자 및 수술적 요소에 영향을 받지 않고 유지기간동안 안정적으로 유지되었으며, 발치와 치조제 보존술은 임상적으로 사용가능한 술식이라고 사료된다.

• Advances in pediatric surgery
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• 제19권2호
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• pp.57-65
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• 2013

The entity of negative appendectomies still poses a dilemma in chlidren. Focused computed tomography (CT) scanning has become the diagnostic test of choice in many hospitals. However, the impact of CT scans on the diagnosis in children is unknown exactly. The purpose of this study was to critically evaluate CT scans for the evaluation of acute appendicitis in children, to review utilization of this diagnostic test in our appendicitis population and to determine if diagnostic accuracy has improved. A retrospective analysis of efficacy of CT scan for diagnosis of appendicitis in children was conducted. Children undergoing appendectomy for acute appendicitis were reviewed from 2007 to 2012. Perforation and negative appendectomy (removal of a normal appendix) rates were determined by the final pathologic report. Statistical comparison were made using the $x^2$ test and significance was assigned at p < 0.05. Five hundred four appendectomies were performed. Mean age was $10.1{\pm}3.21$ years, and 62.7% were boys. Overall, 308 children (61.1%) underwent CT scanning, 100 (19.8%) had US performed, and 97 (19.2%) had no radiographic study. A pathologically normal appendix was removed in 8.7% (27 of 308) of CT patients, 9.0% (9 of 100) of US patients, and 11.3% (11 of 97) of patients without a study. The frequency of CT scanning increased from 29.7% (27 of 91) of all children in 2007 to 75.6% (59 of 78) in 2012, whereas utilization of US decreased from 30.8% (28 of 91) to 11.5% (9 of 78). During this time period the difference in the negative appendectomy rate did change significantly from 14% to 6%. Liberal use of CT scans in diagnosing appendicitis in children has resulted in a decreased negative appendectomy rate.

• Journal of Periodontal and Implant Science
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• 제46권5호
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• pp.337-349
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• 2016

Purpose: The aim of this study was to compare and analyze the peri-implant tissue conditions and prospective clinical outcomes associated with 2 types of hydroxyapatite (HA)-coated implants: (1) fully HA-coated implants and (2) partially HA-coated implants with resorbable blast medium on the coronal portion of the threads. Methods: Forty-four partially edentulous patients were randomly assigned to undergo the placement of 62 HA-coated implants, and were classified as the control group (partially HA-coated, n=30) and the test group (fully HA-coated, n=32). All patients had chronic periodontitis with moderate crestal bone loss around the edentulous area. The stability and clinical outcomes of the implants were evaluated using the primary and secondary implant stability quotient (ISQ), as well as radiographic, mobility, and peri-implant soft tissue assessments around the implants. The Wilcoxon signed-rank test and the Mann-Whitney test were used to evaluate differences between and within the 2 groups, with P values <0.05 considered to indicate statistical significance. Results: The fully HA-coated implants displayed good retention of crestal bone, and insignificant differences were found in annual marginal bone loss between the 2 types of HA-coated implants (P>0.05). No significant differences were found in the survival rate (group I, 100%; group II, 100%) or the success rate (group I, 93.3%; group II, 93.8%). The fully HA-coated implants also did not significantly increase the risk of peri-implantitis (P>0.05). Conclusions: The fully HA-coated implants did not lead to an increased risk of peri-implantitis and showed good retention of the crestal bone, as well as good survival and success rates. Our study suggests that fully HA-coated implants could become a reliable treatment alternative for edentulous posterior sites and are capable of providing good retention of the crestal bone.

• 대한방사선기술학회지:방사선기술과학
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• 제27권4호
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• pp.37-41
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• 2004

목 적 : 측정을 통한 장치의 성능관리 평가로 임상실무에서의 능력배양과 정확한 관전압, 조사시간, 출력선량을 측정하는 기술을 익히고 병원에서 사용 중인 간접촬영용 X-선 발생장치 성능현황을 파악하기 위함이다. 재료 및 방법 : 관전압, 조사시간, 출력선량 측정기를 이용하여 10개 대학병원 간접촬영용 X-선 발생장치(원내,외 각 10대)를 이용하였다. 결 과 : 관전압 정확도 시험 PAE 판정에 의해 부적합한 간접촬영기는 3대가 나왔으며, 조사시간의 정확도 시험에서는 2대, 또한 조사선량의 재현성 시험에서도 조사선량에 대한 변동계수를 계산한 결과 3대가 나왔다. 3가지 성능검사에서 원외(이동차량)의 부적합한 간접촬영기는 5대, 원내는 3대로 원외(이동차량)의 간접촬영기가 원내보다 부적합한 것이 높게 나타났다. 결 론 : 간접촬영기의 성능을 일정하게 유지함으로서 방사선 피폭경감, 화질관리, 재촬영 감소 등에 의해 환자에게 양질의 의료서비스를 제공할 수 있는 여건을 마련할 수 있을 것이다. 따라서 정기적인 성능검사가 필요하다고 사료된다.