镀银导电纤维的制备和性能

对短切聚酯纤维进行化学镀银,制备了用于导电高分子材料的导电填料,探讨了氨水浓度、装载量及稳定剂对纤维化学镀银的影响。实验表明,φ=0.10的氨水有利于化学镀银;通过调整装载量,可提高纤维的增重量率和硝酸银的利用率;稳定剂的加入可阻止镀液自分解,但对包覆层的均匀性和致密性有影响。电性能测试表明,镀银纤维的体积电阻率可达3.35×1-0 3Ω.cm,以其作为导电橡胶填料,当含量为w=0.40时,其电阻率为1.54×1-0 1Ω.cm。     

VITAPEX糊剂治疗乳磨牙髓底穿通的疗效观察

目的：观察VITAPEX糊剂治疗乳磨牙髓底穿通的临床治疗效果。方法：随机收集216例238颗髓底穿通的乳磨牙，局麻下常规根管预备达到理想根充条件，将VITAPEX糊剂压入根管内，髓底穿通处留有糊剂覆盖，双层垫底永久充填。结果：术后临床随访1～3年，平均成功率94．9％。结论：VITAPEX用于乳磨牙髓底穿通的治疗，可维持牙列完整性促进颔骨的正常发育。治疗后的乳磨牙利于咀嚼，与间隙保持器比较患儿更易接受。     

广东地产中药中砷含量的测定

本文采用Ag- DDC分光光度法和新银盐法对广东地产13种中药材的砷含量进行测定,参考相关的限量标准,了解广东地产中药材砷的含量情况。结果发现石菖蒲的砷含量远远高于各项限量标准,其余12种中药材砷的含量较低。     

试色糊剂对Ips-empressⅡ全瓷冠颜色的影响

目的：观察试色糊剂对全瓷冠颜色的影响。方法：在临床上收集缺损、变色或过小的上前牙共计50颗,行全瓷冠修复（Ips-empressⅡ全瓷系统制作）。粘结前由同一实验人员用试色糊剂试色,将全瓷冠就位未涂试色糊剂时作为对照组,用电脑比色仪测定对照组及5种试色糊剂[A1、A3、Transluent（Trt）、Whiteopaque（WOT）和B0.5opaque（B0.5）]试色后的L、a、b值,用卡尺测量被测点的瓷层厚度,根据公式色ΔEab=（ΔL^2＋Δa^2＋Δb^2）1/2、Lab=L、Cab=（a^2＋b^2）^1/2、Hab=arctan（b/a）计算并分析每种糊剂试色后的色差、明度、饱和度和色相角。结果：50颗全瓷冠被测点（唇面中1/3）的平均瓷层厚度为1.668mm,用5种试色糊剂试色后的Lab、Cab、Hab值与对照组相比差异无显著性（P〉0.05）;5种试色糊剂引起的色差均小于1.5NBS,临床上肉眼均难以察觉。结论：当全瓷冠的瓷层厚度达到1.7mm时,粘结剂对修复体颜色的影响较小,肉眼难以察觉。随着瓷层厚度的下降,应考虑树脂粘结剂的遮色作用。     

Conductive Layers on a Shrinkable PET Film by Flexographic Printing

In this study, the extremely important and difficult topic of flexographic printing on a heat-shrinkable substrate was taken up. Six commercially available, electrically conductive inks based on silver, copper and graphite nanoparticles were selected and tested upon their applicability for printing on the temperature-sensitive PET material. As a printing substrate, the one-direction heat-shrinkable PET film, with a maximum shrinkage of 78%, was selected. All of the examined inks were subjected to the printing process throughout three different anilox line screens. The tested inks, along with the electric paths printed with them, were subjected to various tests. The main parameters were evaluated, such as printability combined with the rheology tests and ink adhesion to the examined PET substrate together with the electrical conductivity before and after the shrinkage.     

骨导多频听觉稳态诱发反应的测试

目的：了解多频听觉稳态诱发反应（MASSR）对骨导客观听阈及对传导性聋评估的准确性。方法：对30例传导性聋患者进行气、骨导MASSR及纯音测听,并将MASSR反应阈和纯音听阈进行比较。结果：气、骨导MASSR反应阈和纯音听阈之间具有较好的相关性,MASSR对传导性聋评估的准确性和纯音测听相似。结论：MASSR可用作传导性聋患者客观听阈的评估。     

Comparative toxicity of silicon dioxide,silver and iron oxide nanoparticles after repeated oral administration to rats

Although silicon dioxide (SiO₂), silver (Ag) and iron oxide (Fe₂O₃) nanoparticles are widely used in diverse applications from food to biomedicine, in vivo toxicities of these nanoparticles exposed via the oral route remain highly controversial. To examine the systemic toxicity of these nanoparticles, well‐dispersed nanoparticles were orally administered to Sprague–Dawley rats daily over a 13‐week period. Based on the results of an acute toxicity and a 14‐day repeated toxicity study, 975.9, 1030.5 and 1000 mg kg^–1 were selected as the highest dose of the SiO₂, Ag and Fe₂O₃ nanoparticles, respectively, for the 13‐week repeated oral toxicity study. The SiO₂ and Fe₂O₃ nanoparticles did not induce dose‐related changes in a number of parameters associated with the systemic toxicity up to 975.9 and 1000 mg kg^–1, respectively, whereas the Ag nanoparticles resulted in increases in serum alkaline phosphatase and calcium as well as lymphocyte infiltration in liver and kidney, raising the possibility of liver and kidney toxicity induced by the Ag nanoparticles. Compared with the SiO₂ and Fe₂O₃ nanoparticles showing no systemic distribution in all tissues tested, the Ag concentration in sampled blood and organs in the Ag nanoparticle‐treated group significantly increased with a positive and/or dose‐related trend, meaning that the systemic toxicity of the Ag nanoparticles, including liver and kidney toxicity, might be explained by extensive systemic distribution of Ag originating from the Ag nanoparticles. Our current results suggest that further study is required to identify that Ag detected outside the gastrointestinal tract were indeed a nanoparticle form or ionized form. Copyright © 2015 John Wiley & Sons, Ltd.     

双助益肠汤配合中药贴脐热敷治疗脾肾两虚型慢性结肠炎83例

[目的]观察双助益肠汤配合中药贴脐热敷治疗脾肾两虚型慢性结肠炎疗效。[方法]对83例患者内服自拟"双助益肠汤"水煎服,配合中药贴脐热敷,观察60天判定疗效。[结果]治愈22例(26.51%),显效29例(34.94%),好转26例(31.33%),无效6例(7.23%),总有效率为92.77%。[结论]双助益肠汤配合中药贴脐热敷治疗慢性结肠炎,内外合治,相互补充,标本兼顾,疗效确切,值得推广应用。     

根管治疗约诊间疼痛的临床控制

目的:通过磨牙根管治疗过程中3种根管内封药方法的疗效比较,探讨根管治疗约诊间疼痛(EIAP)的控制措施.方法:将262例患者274颗患牙据根管预备后根管内封药分为Vitapex糊剂组、氢氧化钙糊剂组以及樟脑酚药尖组,1周后约诊,观察记录患者的疼痛、肿胀情况.结果:根管治疗过程中约诊间疼痛的发生率Vitapex糊剂组较其...