背景:氧化锆陶瓷作为临床冠桥修复材料之一,因其优秀的理化性能、良好的美学修复效果及稳定的生物相容性等诸多优点,被广泛应用于临床修复治疗。目的:通过查阅文献分析氧化锆的理化性质与氧化锆陶瓷修复体的临床使用情况、使用寿命和临...背景:氧化锆陶瓷作为临床冠桥修复材料之一,因其优秀的理化性能、良好的美学修复效果及稳定的生物相容性等诸多优点,被广泛应用于临床修复治疗。目的:通过查阅文献分析氧化锆的理化性质与氧化锆陶瓷修复体的临床使用情况、使用寿命和临床粘接修复操作过程中的要点,总结氧化锆修复体研究现状并对其发展趋势进行展望。方法:应用计算机在PubMed、CNKI、SCIE、万方等数据库中检索有关氧化锆陶瓷的文献,中文检索词为“氧化锆,物理性质;氧化锆,化学性质;氧化锆陶瓷,临床应用;氧化锆陶瓷,寿命;氧化锆陶瓷,表面处理;氧化锆陶瓷,粘接剂;釉锆”等,英文检索词为“zirconia and physical property;zirconia and chemical property;zirconia ceramics and clinical applications;zirconia ceramics and service life;zirconia ceramics and surface treatment;zirconia ceramics and adhesives;self-glazed zirconia”等。结果与结论:氧化锆陶瓷具有优秀的理化性能、稳定的生物相容性与美学特性。通过物理喷砂与含有10-甲基丙烯酰氧癸基磷酸酯的底漆处理剂可有效改善氧化锆修复体的临床粘接表现与粘接耐久性。与传统氧化锆陶瓷不同,新型氧化锆陶瓷“釉锆”采用增材制造技术生产,具有节省耗材成本、可用于多种修复体加工制作的特点,其实际粘接表现有待科学实验与临床病例的长期随访观察进一步证实。展开更多
According to the reciprocity principle, we propose an efficient model to compute the shielding effectiveness of a rectangular cavity with apertures covered by conductive sheet against an external incident electromagne...According to the reciprocity principle, we propose an efficient model to compute the shielding effectiveness of a rectangular cavity with apertures covered by conductive sheet against an external incident electromagnetic wave. This problem is converted into another problem of solving the electromagnetic field leakage from the cavity when the cavity is excited by an electric dipole placed within it. By the combination of the unperturbed cavity field and the transfer impedance of the sheet, the tangential electric field distribution on the outer surface of the sheet is obtained. Then, the field distribution is regarded as an equivalent surface magnetic current source responsible for the leakage field. The validation of this model is verified by a comparison with the circuital model and the full-wave simulations. This time-saving model can deal with arbitrary aperture shape, various wave propagation and polarization directions, and the near-field effect.展开更多
文摘背景:氧化锆陶瓷作为临床冠桥修复材料之一,因其优秀的理化性能、良好的美学修复效果及稳定的生物相容性等诸多优点,被广泛应用于临床修复治疗。目的:通过查阅文献分析氧化锆的理化性质与氧化锆陶瓷修复体的临床使用情况、使用寿命和临床粘接修复操作过程中的要点,总结氧化锆修复体研究现状并对其发展趋势进行展望。方法:应用计算机在PubMed、CNKI、SCIE、万方等数据库中检索有关氧化锆陶瓷的文献,中文检索词为“氧化锆,物理性质;氧化锆,化学性质;氧化锆陶瓷,临床应用;氧化锆陶瓷,寿命;氧化锆陶瓷,表面处理;氧化锆陶瓷,粘接剂;釉锆”等,英文检索词为“zirconia and physical property;zirconia and chemical property;zirconia ceramics and clinical applications;zirconia ceramics and service life;zirconia ceramics and surface treatment;zirconia ceramics and adhesives;self-glazed zirconia”等。结果与结论:氧化锆陶瓷具有优秀的理化性能、稳定的生物相容性与美学特性。通过物理喷砂与含有10-甲基丙烯酰氧癸基磷酸酯的底漆处理剂可有效改善氧化锆修复体的临床粘接表现与粘接耐久性。与传统氧化锆陶瓷不同,新型氧化锆陶瓷“釉锆”采用增材制造技术生产,具有节省耗材成本、可用于多种修复体加工制作的特点,其实际粘接表现有待科学实验与临床病例的长期随访观察进一步证实。
基金Project supported by the National Natural Science Foundation of China(Grant No.51307055)in part by the State Grid Corporation of China(Grant No.No.SGRI-WD-71-12-009)
文摘According to the reciprocity principle, we propose an efficient model to compute the shielding effectiveness of a rectangular cavity with apertures covered by conductive sheet against an external incident electromagnetic wave. This problem is converted into another problem of solving the electromagnetic field leakage from the cavity when the cavity is excited by an electric dipole placed within it. By the combination of the unperturbed cavity field and the transfer impedance of the sheet, the tangential electric field distribution on the outer surface of the sheet is obtained. Then, the field distribution is regarded as an equivalent surface magnetic current source responsible for the leakage field. The validation of this model is verified by a comparison with the circuital model and the full-wave simulations. This time-saving model can deal with arbitrary aperture shape, various wave propagation and polarization directions, and the near-field effect.
