Quantification of Myocardial Blood Flow in Absolute Terms Using 82Rb PET Imaging: The RUBY-10 Study

ObjectivesThe purpose of this study was to compare myocardial blood flow (MBF) and myocardial flow reserve (MFR) estimates from rubidium-82 positron emission tomography (⁸²Rb PET) data using 10 software packages (SPs) based on 8 tracer kinetic models.BackgroundIt is unknown how MBF and MFR values from existing SPs agree for ⁸²Rb PET.MethodsRest and stress ⁸²Rb PET scans of 48 patients with suspected or known coronary artery disease were analyzed in 10 centers. Each center used 1 of 10 SPs to analyze global and regional MBF using the different kinetic models implemented. Values were considered to agree if they simultaneously had an intraclass correlation coefficient >0.75 and a difference <20% of the median across all programs.ResultsThe most common model evaluated was the Ottawa Heart Institute 1-tissue compartment model (OHI-1-TCM). MBF values from 7 of 8 SPs implementing this model agreed best. Values from 2 other models (alternative 1-TCM and Axially distributed) also agreed well, with occasional differences. The MBF results from other models (e.g., 2-TCM and retention) were less in agreement with values from OHI-1-TCM.ConclusionsSPs using the most common kinetic model—OHI-1-TCM—provided consistent results in measuring global and regional MBF values, suggesting that they may be used interchangeably to process data acquired with a common imaging protocol.     

iRoot BP Plus根管倒充填联合Bio-Oss植骨在治疗慢性根尖周病变中的临床效果

目的 探讨显微根尖外科手术中iRoot BP Plus倒充填和Bio-Oss植骨在治疗慢性根尖周病变的临床效果。方法 选取2015年10月～2018年1月期间收治的慢性根尖周炎共计126颗患牙作为研究对象,按是否进行iRoot BP Plus根管倒充填和Bio-Oss植骨修复缺损分为三组。术后复查,通过临床检查和X线片评定结果,分析临床疗效。结果 术后12个月根尖手术中行iRoot BP Plus和Bio-Oss联合应用组治疗成功率达97.62%,iRoot BP Plus治疗组未行Bio-Oss植骨组的治疗成功率达80.95%,而单纯根尖手术治疗组治疗成功率仅为54.76%,组间差异有统计学意义(P0.05)。结论 显微根尖外科手术中iRoot BP Plus倒充填联合Bio-Oss植骨具有良好的临床效果。     

iRoot SP的特性及根管封闭剂超充的研究进展

根管治疗效果与根管封闭剂密切相关,而在充填过程中,很可能存在根管封闭剂超充填的情况。商品化的根管封闭剂种类众多,iRoot SP作为一种新型生物陶瓷类根管封闭剂,因具有良好的生物相容性、封闭性和抗菌性而逐渐被重视,其超充是否会影响患牙的预后也引起了关注。本文总结了iRoot SP理化及生物学性能,以及根管封闭剂超充填的研究进展,结合随访病例分析iRoot SP超充的预后情况。     

Implant placement for patients with cleft lip and palate: A clinical report and guidelines for treatment

The multidisciplinary teams involved in the treatment of individuals with cleft lip and palate are challenged when implants are indicated in the cleft area. Difficulties include obtaining a healthy peri-implant area and, especially, obtaining the natural-looking papilla essential for esthetic success. The area affected by the cleft has a bone deficiency, which is typically augmented with an alveolar bone graft at adolescence. Guidelines for the 3-dimensional placement of implants at the cleft area are presented based on clinical reports. The patients were followed up for at least 1 year. Adoption of the proposed guidelines enables satisfactory esthetic and functional outcomes in patients with cleft lip and palate.     

Inhibitors of TLR-4, NF-κB,and SAPK/JNK signaling reduce the toxic effect of lipopolysaccharide on RAW 264.7 cells

The present study was designed to examine and compare the effects of three suppressors on the cytokine response in tandem with examining: the synthesis of inducible forms of heat shock proteins; HSP72 and HSP90α; activities of NF-κB and SAPK/JNK signaling pathways; and TLR4 expression. Pre-treatment with inhibitors offers promise as protective means to lower the activity of these cascades, thereby circumventing the formation of excessive amounts of pro-inflammatory molecules. Three inhibitors of TLR4, SAPK/JNK, and NF-κB signaling, namely CLI-095, SP600125, and IKK Inhibitor XII, respectively, were added to cultured RAW 264.7 macrophages before the Escherichia coli lipopolysaccharide (LPS) application. Treatments of RAW 264.7 cells with each of the inhibitors resulted in a reduced response to LPS as was visualized by a decrease of TNF-α, IL-1, and IFN-γ production. In addition, inhibitors of the NF-κB and SAPK/JNK signaling reduced IL-6 production in LPS-treated cells, whereas the IKK inhibitor XII also decreased IL-10 production. Further, the NO production in LPS-stimulated macrophages was significantly reduced following application of CLI-095 or IKK inhibitor XII. The results also showed that the inhibitors suppressed TLR4 production and decreased phosphorylation of NF-κB and SAPK/JNK proteins, thereby preventing the activation NF-κB and SAPK/JNK signaling pathways in LPS-activated cells. In addition, the production of inducible heat shock proteins, HSP72 and HSP90-α, was reduced in LPS-stimulated RAW 264.7 cells pre-treated with inhibitors. These results suggest that inhibitors CLI-095, SP600125, and IKK inhibitor XII demonstrate potential effectiveness in the reduction of the inflammatory response by mechanisms involving both the cellular defense system and cellular signaling. In conclusion, suppressor of NF-κB cascade, IKK inhibitor XII, seems to be the most effective anti-toxic agent among studied inhibitors.     

iRoot BP修复磨牙髓室底穿孔的研究

目的 探讨iRoot BP直接修复髓室底穿孔的效果。方法 收集新鲜拔除的人恒磨牙40颗,其中36颗于髓室底中央制备直径2 mm的穿孔洞型,随机分为A、B组,每组18颗,分别用iRoot BP和矿物三氧化聚合体（MTA）修复髓室底穿孔;另外4颗为对照组,只开髓不制备髓室底穿孔。从A、B组中各随机选择3个样本用扫描电子显微镜观察材料和牙本质的结合界面;其余15个样本用葡萄糖氧化酶-蒽酮法检测微渗漏值。结果 A组中,iRoot BP与牙本质结合较为紧密,而B组中MTA和牙本质之间存在不均匀的微小间隙。在观察期内,B组的微渗漏值高于A组,其差异有统计学意义（P<0.05）。结论 iRoot BP修复髓室底穿孔的封闭效果优于MTA。     

P物质、血管活性肠肽在OLP血清中的表达

目的：检测P物质（SP）、血管活性肠肽（VIP）在口腔扁平苔藓（OLP）血清中的表达,并探讨SP、VIP与OLP的关系。方法：采用酶联免疫吸附法（ELISA）检测40例OLP和正常人血清中SP、VIP的含量。结果：SP在OLP患者血清中的含量高于正常人血清中含量（P〈0．05）,VIP在OLP患者血清中的含量与正常人血清中的含量无差异（P〉0．05）。结论：SP在OLP的发生发展中可能参与了淋巴细胞的浸润及增殖,并参与了OLP慢性炎症机制。