Comparison between RVG UI sensor and Kodak InSight film for detection of incipient proximal caries

Object The purpose of this study was to compare the efficacy of the four combination modes of Trophy RadioVisioGraphy UI sensor (Trex-Trophy Radiology Inc., Marne-la-Valee, France) and Kodak InSight film (Eastman Kodak Co., Rochester, NY) for detecting proximal dental caries. Materials and Methods Thirty extracted human upper premolars were selected. Of 60 surfaces, 25 had carious lesions in the form of small cavities, and the rest showed no evidence of caries as verified by a micro computed tomogram (micro CT; XCT Research SA+, Stratec Medizintechnik GmbH, Pforzheim, Germany). All teeth were radiographed with the paralleling technique (60kV, 40 cm focus-to-sensor distance). Four combination modes (high-resolution caries mode—HRC; high-sensitivity caries mode—HSC; high-resolution periodontal mode—HRP; and high-resolution endo mode—HRE) were used. Exposure was set at 0.12 sec for HRC, 0.08 sec for HSC, 0.16 sec for HRP, 0.12 sec for HRE, and 0.16 sec for the Kodak InSight film. The resulting images were evaluated by three oral radiologists. The same three observers evaluated the digital images, and were allowed to use the contrast and brightness controls in doing so. Possible differences in ROC curve areas among image modalities were assessed by the Friedman test. Results The mean ROC curve areas were 0.66±0.11 for HRC, 0.78±0.02 for HSC, 0.76±0.04 for HRE, 0.77±0.04 for HRP, and 0.71±0.09 for the Kodak InSight film. There were no statistically significant differences between HRC, HSC, HRE, HRP and the Kodak InSight film in terms of proximal caries detection. Conclusion The four modes of RVG UI system are each a viable alternative to intraoral film for the detection of incipient dental caries.     

Biaxial flexural strength and phase transformation of Ce-TZP/Al2O3 and Y-TZP core materials after thermocycling and mechanical loading

PURPOSE

The purpose of the present study was to evaluate the effect of thermocycling and mechanical loading on the biaxial flexural strength and the phase transformation of one Ce-TZP/Al₂O₃ and two Y-TZP core materials.

MATERIALS AND METHODS

Thirty disc-shaped specimens were obtained from each material. The specimens were randomly divided into three groups (control, thermocycled, and mechanically loaded). Thermocycling was subjected in distilled water for 10000 cycles. Mechanical loading was subjected with 200 N loads at a frequency of 2 Hz for 100000 times. The mean biaxial flexural strength and phase transformation of the specimens were tested. The Weibull modulus, characteristic strength, 10%, 5% and 1% probabilities of failure were calculated using the biaxial flexural strength data.

RESULTS

The characteristic strengths of Ce-TZP/Al₂O₃ specimens were significantly higher in all groups compared with the other tested materials (P<.001). Statistical results of X-ray diffraction showed that thermocycling and mechanical loading did not affect the monoclinic phase content of the materials. According to Raman spectroscopy results, at the same point and the same material, mechanical loading significantly affected the phase fraction of all materials (P<.05).

CONCLUSION

It was concluded that thermocycling and mechanical loading did not show negative effect on the mean biaxial strength of the tested materials.     

不同腹膜转运特性对血钙、血磷及PTH的影响

目的研究无尿持续非卧床腹膜透析（CAPD）患者腹膜转运功能对骨矿物质代谢的影响。方法选择159例无尿CAPD患者,根据腹膜平衡试验将患者分为2组：低转运特性组87例,高转运特性组72例。检测两组患者血钙、血磷、甲状旁腺激素等生化指标,测定腹膜尿素清除指数（KT／V）及肌酐清除率（CCr）。结果与低转运特性患者相比,高转运特性患者血钙、血磷和甲状旁腺激素水平明显偏低,而KT／V、CCr偏高,差异有统计学意义（P〈0．05）。多元逐步回归分析显示,CCr与血钙、血磷呈负相关（P〈0．05）,Kt／V与血钙呈负相关关系（P〈0．05）,而D／Pcr与血钙、血磷、甲状旁腺激素无明显相关性。结论低腹膜转运特性患者易出现高磷血症和高甲状旁腺激素;腹摸转运特性能影响血钙、血磷、甲状旁腺激素水平,但之间未见显著相关性。     

媒体引导对中医古籍阅读推广的作用及其启示

由于中医古籍的文本内容、读者群及其阅读能力等因素,古籍文献的阅读推广在高校图书馆文化活动中一直处于“盆地”状态。 以南京中医药大学图书馆读书节的馆藏中医古籍展览活动为例,阐述了媒体引导对中医古籍阅读推广的作用,如启发读者对中医古籍的兴趣、发挥中医古籍中的名人效应、彰显中中医古籍的海外影响力。媒体引导下中医古籍资源的传播和利用效果为图书馆今后转换思路,做好特色文献阅读推广工作提供参考与借鉴。     

地方高校图书馆特色资源建设分析*

本文以广西中医药大学图书馆近几年来建设特色资源库情况为例,分析建库内容、建库层次,指出存在的问题及应对对策,提出深化建库内容、深化层次建设是特色资源建设的发展趋势。     

融水小型猪的实验动物化系列研究概述

融水小型猪的种源来自广西融水县,2012年被引到广东繁育并测定了基础数据,包括种质特性、繁殖性能、生长曲线、血液学指标、血生化指标、脏器系数、染色体分析。参照国家和地方有关实验动物标准,初步建立了融水小型猪微生物与寄生虫、环境与设施、饲料、病理学、遗传学等质量控制标准。融水小型猪能适应当地气候,繁殖良好,自然受孕率为88.3%,妊娠期平均112 d,初产平均胎产仔6.1头,经产平均产仔7.9头。融水小型猪体型小,雌雄成年体重(6月龄)分别为17.21±5.20 kg和16.35±5.23 kg,性情温顺,线粒体DNA分析表明融水小型猪比兰屿猪更为古老。通过标准化的饲养管理与质量控制,具有培育成实验用小型猪的基本条件。     

川黄连多指标成分定量及特征图谱建立研究＊

目的 测定川黄连（味连、雅连、凤尾连）中7个生物碱（小檗碱、黄连碱、巴马汀、药根碱、表小檗碱、非洲防己碱、格陵兰黄连碱）的含量并建立3种川黄连的特征图谱，构建川黄连科学的质量控制方法，以提升川黄连药材、饮片及其中成药制剂的质量控制水平，保障临床用药安全有效。方法 建立了同时测定7个黄连生物碱成分的HPLC含量测定方法，经方法学验证该方法准确性、重现性、精密度、稳定性、线性均符合要求。测定6批味连、6批雅连、3批凤尾连的7个生物碱的含量以及总生物碱的含量；建立了黄连药材HPLC特征图谱测定方法，经方法学验证，该方法精密度、重现性、稳定性均符合要求。结果 味连的总生物碱含量最高，7个生物碱在味连、雅连、凤尾连中含量各不相同，差异较大；通过对15批黄连的特征图谱相似度的分析，找出共有特征峰15个，与黄连生物碱对照品比对后，指认了8个峰，均为黄连生物碱成分。结论 川黄连多指标成分定量结合特征图谱，可以有效控制川黄连药材的质量，为2020年版《中华人民共和国药典》黄连药材质量标准的完善与提高提供参考。     

基于UPLC-PDA生物碱指标性成分含量合特征图谱的不同产区黄连（味连）整体质量表征研究＊

目的 通过对不同产地黄连（味连）药材质量进行分析，得到黄连药材质量差异表征。方法 采用UPLC-PDA色谱法，建立黄连生物碱指标性成分含量合特征图谱分析方法，采用PLS-DA模型分析，找到不同产区黄连药材质量差异表征。结果 不同产区黄连药材特征图谱色谱峰数量和成分类型一致，以生物碱类成分和非生物碱类成分相对含量同时考量可将黄连药材分为3类：第1级黄连药材主要来源于四川、重庆产区，生物碱和非生物碱类成分含量均较高，9（酚类）号色谱峰成分相对含量为主要相关成分；第2级黄连药材主要来源于四川、重庆产区，生物碱和酚类成分含量较高，1（未知）、13（黄连碱）、2（酚类）、5（其他）、12（生物碱）号色谱峰成分相对含量为主要相关成分；第3级黄连药材主要来源于湖北、重庆、四川产区，生物碱和非生物碱含量较低，11（生物碱）、6（酚类）、8（未知）号色谱峰成分相对含量为主要相关成分。结论 不同产区黄连药材质量差异表征为：四川产黄连药材主要表现为生物碱类成分、其他类成分含量较高，与其他产区黄连差异较大；重庆产黄连主要表现为酚类成分含量较高；湖北产区黄连与重庆产区黄连相似。