Y 型硅酮气管支架置入治疗恶性气管食管瘘临床体会并文献复习

目的：探讨 Y 型硅酮支架置入方法技巧及气管食管瘘(TEF)封堵的相关临床问题。方法复习我院 Y 型 Dumon 支架置入病例，分析操作准备、气管食管瘘封堵疗效及相关注意问题。结果确定气管支架直径[(横径+纵径)/2]并适形裁剪、打磨，硬质支气管镜下高频通气，支架由推送器经硬镜释放，配合可弯曲支气管镜，可成功置入，术后雾化吸入和随访复查，瘘口封堵良好，未见并发症。结论 Y 型 Dumon 支架对于隆突周围 TEF 疗效肯定、安全。充分病情评估、仔细测量瘘口大小，选择合适直径、医护密切配合是 Y 型硅酮支架置入重要环节，加强术后随访管理可一定程度上预防并发症。     

A Soft,Flexible Stent/Bung for Marsupialisation

A soft flexible stent or bung for marsupialisation using putty elastomeric impression material rather than an acrylic bung.     

三种间接粘接方法转移托槽的准确性比较

目的:比较间接粘接技术中使用不同转移托盘转移托槽的准确性。方法:选择2019年7月至2021年1月空军军医大学口腔医院正畸科就诊的患者28例，分为A、B、C三组，分别使用3D打印托盘、双层压膜塑料托盘、双层硅橡胶托盘粘接托槽。A组口内扫描获取工作模型，使用软件定位托槽，再导出数字化模型，作为该组托槽转移前的数字化模型。B组和C组在工作石膏模型上定位托槽，使用口内扫描仪扫描，获取B组和C组托槽转移前的数字化模型。A、B、C组制作相应的转移托盘，将托槽粘接至患者口内后对患者口内扫描，获取三组托槽实际粘接的数字化模型。使用Geomagic软件测量转移前后的数字化模型，获取使用不同托盘时，托槽粘接的实际位置距离预设在近远中方向、龈 方向、颊舌方向上的线距误差，超过0.5 mm的托槽转移线距误差定义为严重误差。 结果:近远中向上B组与A组间、C组与A组间严重误差发生率的差异存在统计学意义( P<0.05)。龈 向上3组组间的严重误差发生率差异均存在统计学意义( P<0.05)。颊舌向上3组组间的严重误差发生率差异无统计学意义。 结论:(1)3D打印托盘转移托槽时严重误差的发生率显著高于双层硅橡胶托盘与双层压膜塑料托盘。(2)双层硅橡胶托盘粘接托槽时严重误差的发生率最低。     

注射用益气复脉(冻干)与氯化丁基胶塞相容性研究中抗氧剂和硫化剂的含量测定

目的 建立注射用益气复脉（冻干）药品中氯化丁基橡胶塞用抗氧剂2,6-二叔丁基-4-甲基苯酚（BHT）和硫化剂对-特辛基苯酚的含量测定方法,并对其稳定性进行考察。方法 采用ACQUITY UPLC BEH C₁₈柱,以乙腈-0.2%甲酸水为流动相梯度洗脱,体积流量0.3 mL/min,柱温35℃,检测波长280 nm。结果 BHT和对特-辛基苯酚质量浓度在0.4～20μg/mL线性关系良好（r > 0.999）;准确度试验平均回收率分别为99.3%、101.9%,精密度及耐用性结果均符合要求;注射用益气复脉（冻干）稳定性考察样品中BHT和对-特辛基苯酚含量均小于限度值。结论 所建立的方法准确可靠,可用于注射用益气复脉（冻干）中BHT和对-特辛基苯酚的含量测定。     

Opportunities and obstacles in translating evidence to policy in occupational asthma

Purpose

Occupational asthma (OA), a common respiratory disorder in Western countries, is caused by exposures at the workplace. It is part of a broader definition of work-related asthma (WRA) that also includes pre-existing asthma aggravated by substances present in the workplace environment, and it is potentially preventable. The purpose of this paper is to illustrate preventive measures for occupational asthma by case studies.

SY-1和MDX4-4210硅橡胶热老化性能试验

目的 对比SY-1和MDX4-4210硅橡胶的热老化性能。方法 在相同条件下对两种硅橡胶材料进行了热老化试验,对其老化性能加以评价。结果 热老化后,SY-1硅橡胶的扯断强度性能变化百分比与MDX4-4210硅橡胶无显著差异(P>0.05);SY-1硅橡胶的邵氏硬度、扯断伸长率、永久变形率(3min后)、撕裂强度的性能变化百分比优于MDX4-4210硅橡胶(P<0.01)。结论 SY-1硅橡胶热老化性能略优于MDX4-4210硅橡胶,热老化性能可以满足作为面部软组织缺损赝复材料的要求。     

医用硅橡胶对骨桥蛋白mRNA基因表达的影响

通过观察医用硅橡胶对成骨细胞的骨桥蛋白mRNA基因表达的影响,进行生物材料的分子生物相容性研究方法的初探.将医用硅橡胶的浸提液与原代成骨细胞共同培养,用骨桥蛋白探针与细胞进行原位杂交.镜下观察细胞内有无特殊的染色颗粒.结果表明:无细胞毒性的整形外科用植入性硅橡胶材料组显示出该基因表达的蓝黑色颗粒;有细胞毒性的口腔印模硅橡胶则无明显表达现象.原位杂交法观察医用硅橡胶对成骨细胞骨桥蛋白基因表达的影响,可作为评价生物材料的分子生物相容性的参考,将可用于对骨植入材料和组织工程材料的分子生物相容性研究.     

Accidental ingestion and aspiration of root canal instruments and other dental foreign bodies in a French population

AIM: To determine the incidence of aspiration and ingestion of endodontic instruments in France during root canal treatment without using rubber dam. METHODOLOGY: Data was provided by two insurance companies representing 24,651 French general dentists over 11 years. The type and number of accidents per year, the number of dental items involved and the percentage of occurrence of either aspiration or ingestion were reported. The incidence of accidental aspiration or ingestion was calculated. The need for hospitalization to remove the endodontic instruments and other dental items was reported and compared using chi square tests. RESULTS: One endodontic instrument was aspirated and 57 were ingested. Forty-three other dental items were aspirated and 409 were ingested. For the endodontic instruments: the incidence of aspiration was 0.001 per 100,000 root canal treatments and the incidence of ingestion was 0.12 per 100,000 root canal treatments. The aspirated endodontic instruments and dental items required statistically more frequent hospitalization than the ingested items (P < 0.0001). The endodontic instruments did not require more frequent hospitalization than other dental items when aspirated (ns) and when ingested (ns). No fatal outcome was reported. CONCLUSION: The incidence of ingestion or aspiration of endodontic instruments was low even thought most general practitioners do not routinely use rubber dam. Use of rubber dam by general practitioners for endodontic procedures should be encouraged by stressing its advantages rather than the fear factor of accidents.