| 1 | 活体牙周膜有限元仿真的可行性研究显示文摘目的通过现代有限元方法研究牙周膜上的静平衡应力状态。方法提出了两种用于分析牙周膜应力状态的有限元方法,把牙周膜看做是整个下颌模型的一部分,通过有限元方法来处理仿真的牙齿并加载,来研究牙周膜对牙周组织的应力应变分布的作用,计算得到的静平衡应力和牙齿根吸收状态进行比较。结果牙周膜的最大应力发生在接近最高点位置,在中跟位置附近存在局部最大应力,而牙周膜顶点区域的应力要大于牙周膜中根附近的局部最大应力。齿槽顶部的舌侧牙周膜部位可以发现静平衡应力。静平衡应力是和位置有关的,有静平衡应力的部位就会发生牙根吸收。结论人类切牙和单根前臼齿一样,植入物会导致其牙周膜顶点附近静平衡应力的增长,这一点同之前的发现相一致。人类切牙根吸收经常作用于牙周膜的顶点部位。 | Ansgar Hohmann Cornelia Kober Thomas Radtke Philippe Young Martin Geiger Andrew Boryor Christian Sander Franz Gunter Sander | 2008 | 医用生物力学2008，23，1： | 3 |
| 7 | Concordance of the point-of-care circulating cathodic antigen test for the diagnosis of intestinal schistosomiasis in a low endemicity area显示文摘Background:The Kato-Katz technique is recommended worldwide for the diagnosis of intestinal schistosomiasis,detecting parasite eggs in feces of infected people.However,new tests have been developed in order to facilitate diagnosis,e.g.by detection of specific antigens secreted by schistosomes,such as the circulating cathodic antigen(CCA).The aim of this study was to evaluate the performance of the point-of-care circulating cathodic antigen test(POC-CCA)compared to the Kato-Katz technique in a low prevalence area in the Amazon Region,located in the municipality of Primavera,State of Para,Brazil.Methods:Positivity rates of the POC-CCA test and the Kato-Katz technique were calculated.The sensitivity,specificity,accuracy and kappa coefficient were determined by comparing both methods.The reference standard was established using 16 Kato-Katz slides,12 of the first fecal sample,two of the second and two of the third one.The study also included the concordance between POC-CCA results and different numbers and combinations of Kato-Katz slides.Results:The prevalence of schistosomiasis according to the reference standard or POC-CCA test reached a rate of 9.4%or 23.9%,respectively,among a total of 372 participants.The positivity rates by the Kato-Katz technique increased from 2.4 to 9.4%,according to the increase in the number of slides examined and fecal samples colleaed.A sensitivity of 55.6%,specificity 76.9%,accuracy 76%and k coefficient of 0.06 was observed by comparing one slide of the first sample and POC-CCA.Comparing 6 slides from three different samples,two slides of each,with POC-CCA resulted in a sensitivity of 583%,specificity 78.4%,accuracy 77%and k coefficient of 0.16.Finally,the comparison of 16 slides from three different samples with POC-CCA revealed a sensitivity of 65.7%,specificity 80.4%,accuracy 79%,and k coefficient of 0.27.Conclusions:The immunochromatographic test has the potential to be an important tool to combat schistosomiasis because of its practicality and applicability but should be applied with caution in low prevalence areas and in programs that aim to eliminate this disease. | Sergei Rodrigo Magalhaes de Sousa Isabelle Helena Lima Dias Alvaro Luan Santana Fonseca Bianca Rodrigues Contente Joyce Favacho Cardoso Nogueira Tatyellen Natasha da Costa Oliveira Stefan Michael Geiger Martin Johannes Enk | 2019 | Infectious Diseases of Poverty2019，8，3： | 1 |
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