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41.
Effect of two preventive programs on oral health knowledge and habits among Brazilian schoolchildren
Yvonne A. P. Buischi Per Axelsson Luciene B. Oliveira Marcia P. A. Mayer Per Gjermo 《Community dentistry and oral epidemiology》1994,22(1):41-46
Abstract – The effect upon dental health knowledge and dental health behavior of a comprehensive and a less comprehensive preventive program was compared in a 3-yr follow up study. The comprehensive program included active participation of the students and parental involvement. The study group consisted of 186 Brazilian schoolchildren 13 yr of age at the start of the program. A reference group from another school of similar socioeconomic level was included in the analyses. The data were collected from questionnaires filled in by the children under surveillance after the completion of the program. Significant differences in knowledge as well as in reported behavior were observed. The children enrolled in the comprehensive program in general scored higher in dental health knowledge than did those in the less comprehensive program. However, the latter group of children seemed to have acquired more correct knowledge during the period than had the control and reference children. Similar results were obtained concerning reported dental health behavior. 相似文献
42.
利用Matlab和Ansys workbench软件辅助建立桩核冠三维有限元模型 总被引:2,自引:1,他引:1
目的:利用Matlab和Ansysworkbench软件辅助建立桩核冠三维有限元模型。方法:应用薄层CT技术,获取建模所需二维影像45张(层厚0.5mm,无间隔),利用Matlab软件编程读取图像边界数据,导入Ansys三维有限元专用软件,在Ansysworkbench环境中三维重组模型,同时进行模型单元划分和力学检测。结果:建立包含桩核、冠修复体、牙根、粘固剂、牙胶尖、牙周膜、松质骨和皮质骨的三维有限元模型。结论:利用Matlab软件和Ansysworkbench软件辅助建模,提高了建模的精度、速度和灵活性,为牙颌组织三维有限元建模提供了新的方法。 相似文献
43.
足骨三维有限元模型对足跖骨缺损重建的指导意义 总被引:5,自引:0,他引:5
目的用足骨有限元模型模拟、分析多跖骨缺损对足弓的影响,同时,对临床采用带血管自体骨重建后足的功能进行评价。方法在足骼骨三维模型上模拟出胫侧组、腓侧组跖骨正常和缺损不同情况,以有限元法计算足弓应力和位移的改变;并结合临床评价采用自体骨重建后足位移及应力恢复数据和结果。结果多跖骨缺损后,其有限元模型显示:足弓应力和位移发生明显改变,对足功能影响较大,髂骨重建后,足弓及足支撑点恢复,有限元模拟结果及临床随访效果满意。结论通过足骨有限元模型分析,我们认为:前足损伤致足多跖骨缺损临床上应予重建修复,恢复足的三点支撑和足弓。采用带血管游离自体骨加皮瓣组合移植是较为理想的手术方式。 相似文献
44.
45.
Accelerating cardiac cine 3D imaging using k-t BLAST. 总被引:1,自引:0,他引:1
Sebastian Kozerke Jeffrey Tsao Reza Razavi Peter Boesiger 《Magnetic resonance in medicine》2004,52(1):19-26
By exploiting spatiotemporal correlations in cardiac acquisitions using k-t BLAST, gated cine 3D acquisitions of the heart were accelerated by a net factor of 4.3, making single breathhold acquisitions possible. Sparse sampling of k-t space along a sheared grid pattern was implemented into a cine 3D SSFP sequence. The acquisition of low-resolution training data, which was required to resolve aliasing in the k-t BLAST method, was either interleaved into the sampling process or obtained in a separate prescan to allow for shorter breathhold durations in patients with heart disease. Volumetric datasets covering the heart with 20 slices at a spatial resolution of 2 x 2 x 5 mm3 were recorded with 20 cardiac phases in a total breathhold duration of 25-27 sec, or 18 sec if partial Fourier sampling was additionally employed. The feasibility of the method was demonstrated on healthy volunteers and on patients. The comparison of endocardial area derived from single slices of the 3D dataset with values extracted from separate single-slice acquisitions showed no significant differences. By shortening the acquisition substantially, k-t BLAST may greatly facilitate volumetric imaging of the heart for evaluation of regional wall motion and the assessment of ventricular volume and ejection fraction. 相似文献
46.
The influence of support conditions in the loading fixture on failure mechanisms in the push-out test: a finite element study 总被引:1,自引:0,他引:1
The usefulness of the push-out test as an indicator of interface strength was evaluated using finite element models of intact and partially failed cylindrical push-out specimens loaded against a rigid annular support. The irregular stress distributions that were found in intact specimens depended more on interface conditions at the loading fixture than on a 35% increase in interface area. The maximum stress at the interface was a tensile stress. Critical energy release rates for interface failure were calculated for flawed specimens in which flaw size was either 10 or 100 microns, and for boundary conditions at the loading fixture that were either fixed or slipping in the radial direction. The critical energy release rates depended heavily on the support boundary conditions. Thus, the results of parametric push-out tests can be reasonably compared only for specimens that are very similar in geometry and that are loaded in very carefully controlled fixtures. 相似文献
47.
ChanMA RMN DipN PGCEA Head of Mental Health & RudmanMA RMN RCNT DipNEd Tutor 《Journal of psychiatric and mental health nursing》1998,5(2):143-146
Debate about the best paradigm for mental health nursing is compounded by threats from mainstreaming and genericism. In nursing education, integrated practice may have been devalued in a matrix of reductionist disciplines. The 'gendered' nature of professional knowledge may create a schismatic and self-defeating attitude in nurses. Conversely, nurses may be exhorted to adopt a 'male' paradigm in order to gain academic credibility, in which the caring dimension may be lost. Other polarities such as ideological distinctions between treatment in hospital and care in the community lead to conceptual confusion. These schisms in care are detrimental to both professionals and users. The writers argue that these tensions may be addressed in an 'androgenous' model which presents a challenge to both value systems, rejects the dominance of schismatic models, and offers the potential for a new professional integrity. 相似文献
48.
颅颌面形态有限元分析系统的初步建立 总被引:4,自引:0,他引:4
初步建立一个用于颅颌面形态变化研究的有限元分析系统。方法:程序用BorlandC语言编写,对临床常用的X线头颅定位片进行分析,将呆分析的头颅定位片描在硫酸纸上,用图形数值化仪把节点输入计算机。根据有限元分析法的原理,将头颅定位片上的颅颌面结构份割许多三角形单元,用应变张量来描述颅颌面形态变化。 相似文献
49.
建立模拟功能状态下的下颌骨三维有限元模型 总被引:16,自引:0,他引:16
本文在三维影像重建和三维有限元分析技术的基础上,建立了正常人和颞下颌关节疾病患者正中咬合时下颌骨的三维有限元模型。下颌骨螺旋CT和有限元模型三维重建影像的几何相似性良好,加载方式符合生理状况,比较真实地反映和模拟了功能状态下颞下颌关节与牙合的受力情况。为对颞下颌关节在各种状况下的生物力学行为进行分析和研究创造了条件。 相似文献
50.
Christine Ceci 《Nursing philosophy》2003,4(1):61-76
Abstract The paper contrasts understandings of knowledge grounded in Enlightenment norms with the departures from those norms taken by some strands of feminism and hermeneutics, as well as the contributions made by the writing of Michel Foucault. A reading of Foucault's writings on knowledge, power and the discursive constitution of self and world is offered as a potentially useful frame within which to raise questions about nursing, nurses and knowledge. 相似文献