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Impacts of conservative endodontic cavities on root canal therapy compare to traditional endodontic cavities in premolars

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Impacts of conservative endodontic cavities on root canal th...

互联网金融发展、市场竞争与农村金融机构绩效

2019年中华口腔医学会老年口腔医学专业委员会第十四次全国老年口腔医学学术年会

作者： Juan Xia Weidong Wang Zhengmao Li Bingpeng Lin qianzhou jiang Qian Zhang Xuechao Yang

Objective:Background:This study aims to compare the percentage of dentin removed,instrumentation efficacy,root canal filling and load at fracture between contracted endodontic cavities and traditional endodontic cavities in ***:Forty extracted intact human first premolars were imaged with micro-CT and randomly assigned to CEC or TEC *** CECs were prepared with the aid of 3 D-printed guide template,canals were prepared with a 0.04 taper M-Two rotary instrument and cavities were restored with *** specimens were loaded to fracture in an Instron Universal Testing Machine after a fatigue *** data were analyzed by the independent samples T test and MannWhitney U test,appropriate post hoc ***:In the premolars tested in vitro,CECs conserved coronal dentin in premolars with two dental roots but no impact on the instrument efficacy,the root canal filling or the biomechanical responses compared with ***:The results of this study did not suggest that CEC could improve the fracture resistance of the endodontically treated *** instrumentation efficacy and the percentage of filling material did not significantly differ between CECs and TECs in the premolars.

关键词： 3D-printed template contracted endodontic cavities instrumentation efficacy root canal filling fracture resistance

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农业经济问题 2018年第2期39卷 50-59页

作者：张正平江千舟北京工商大学经济学院

近年来,网络借贷等互联网金融主体纷纷进军农村金融市场,由此形成了全新的市场竞争格局。本文基于2013—2015年108家农村金融机构的数据,分析了互联网金融对农村金融机构财务绩效和社会绩效的影响,以及市场竞争对影响过程的作用。研究... 详细信息

近年来,网络借贷等互联网金融主体纷纷进军农村金融市场,由此形成了全新的市场竞争格局。本文基于2013—2015年108家农村金融机构的数据,分析了互联网金融对农村金融机构财务绩效和社会绩效的影响,以及市场竞争对影响过程的作用。研究发现：互联网金融的发展水平越高,农村金融机构的财务绩效越差,而市场竞争水平的上升将弱化互联网金融发展水平对机构财务绩效的影响;互联网金融的发展水平越高,农村金融机构的社会绩效越差。而市场竞争水平的上升将会强化互联网金融发展水平对机构社会绩效的影响。可见,随着互联网金融在农村的发展,其对农村金融机构的绩效会产生一定的影响,各类农村金融机构应制定合适的发展战略以应对互联网金融的冲击。

关键词：互联网金融农村金融机构市场竞争财务绩效社会绩效

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3D打印技术在牙髓再生领域的研究进展

口腔疾病防治 2021年第4期29卷 279-283页

作者：谭国忠江千舟广州医科大学附属口腔医院牙体牙髓科·广州市口腔再生医学基础与应用研究重点实验室广东广州510182

近年来,牙髓再生成为了口腔医学领域的研究热点,3D打印能实现支架结构和形状的精准调控,为种子细胞黏附和生长因子释放提供基础,通过3D打印组织工程支架构建的3D打印“牙髓复合体”为牙髓再生研究提供了新的方向。本文就3D打印技术应用... 详细信息

近年来,牙髓再生成为了口腔医学领域的研究热点,3D打印能实现支架结构和形状的精准调控,为种子细胞黏附和生长因子释放提供基础,通过3D打印组织工程支架构建的3D打印“牙髓复合体”为牙髓再生研究提供了新的方向。本文就3D打印技术应用于牙髓再生的研究作一综述。文献复习结果表明,3D打印“牙髓复合体”中的支架材料、种子细胞和生长因子在牙髓再生的研究中都扮演着重要角色,其中,支架材料能发挥载体作用负载种子细胞和生长因子,并为其提供合适微环境;牙髓干细胞、根尖乳头干细胞和人脱落乳牙牙髓干细胞等常用种子细胞为牙髓再生提供细胞基础;生长因子的引入可以进一步支持牙髓组织的分化和牙髓血管重建,促进牙髓再生。目前,3D打印“牙髓复合体”在牙髓再生的研究中取得了一定进展,在实验室阶段可诱导牙髓样组织的形成,但制备生物活性良好且具有仿生血管和神经效果的3D打印“牙髓复合体”,为根管内细胞提供氧气和营养物质仍是一个巨大的挑战,需进一步的探索和研究。

关键词：牙髓再生组织工程 3D打印牙髓复合体支架材料种子细胞生长因子牙髓血管重建

Experts consensus on the procedure of dental operative microscope in endodontics and operative dentistry

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International Journal of Oral Science 2023年第3期15卷 371-376页

作者： Bin Liu Xuedong Zhou Lin Yue Benxiang Hou Qing Yu Bing Fan Xi Wei Lihong Qiu Zhengwei Huang Wenwei Xia Zhe Sun Hanguo Wang Liuyan Meng Bin Peng Chen Zhang Shuli Deng Zhaojie Lu Deqin Yang Tiezhou Hou qianzhou jiang Xiaoli Xie Xuejun Liu Jiyao Li Zuhua Wang Haipeng Lyu Ming Xue Jiuyu Ge Yi Du Jin Zhao Jingping Liang Department of Endodontics and Operative Dentistry Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineCollege of StomatologyShanghai Jiao Tong UniversityNational Center for StomatologyNational Clinical Research Center for Oral DiseasesShanghai Key Laboratory of StomatologyShanghai Research Institute of StomatologyShanghaiChina State Key Laboratory of Oral Diseases&National Center for Stomatology&National Clinical Research Center for Oral Diseases&Department of Operative Dentistry and Endodontics West China Hospital of StomatologySichuan UniversityChengduChina Department of Cariology and Endodontology Peking University School and Hospital of Stomatology&National Center of Stomatology&National Clinical Research Center for Oral Diseases&National Engineering Laboratory for Digital and Material Technology of Stomatology&Beijing Key Laboratory of Digital Stomatology&Research Center of Engineering and Technology for Computerized Dentistry Ministry of Health&NMPA Key Laboratory for Dental MaterialsBeijingChina Department of Endodontics and Operative Dentistry Beijing Stomatological HospitalCapital Medical UniversityBeijingChina Department of Operative Dentistry and Endodontics School of StomatologyThe Fourth Military Medical UniversityXi’anChina State Key Laboratory of Oral&Maxillofacial Reconstruction and Regeneration Key Laboratory of Oral Biomedicine Ministry of EducationHubei Key Laboratory of StomatologySchool&Hospital of StomatologyWuhan UniversityWuhanChina Department of Operative Dentistry and Endodontics Hospital of StomatologyGuanghua School of StomatologySun Yat-Sen University&Guangdong Provincial Key Laboratory of StomatologyGuangzhouChina Department of Endodontics School of StomatologyChina Medical UniversityShenyangChina Stomatology Hospital School of StomatologyZhejiang University School of MedicineZhejiang Provincial Clinical Research Center for Oral DiseasesKey Laboratory of Oral Biomedical Research of Zhejiang ProvinceCancer Center of Zheji

The dental operative microscope has been widely employed in the field of dentistry,particularly in endodontics and operative dentistry,resulting in significant advancements in the effectiveness of root canal therapy,endodontic surgery,and dental ***,the improper use of this microscope continues to be common in clinical settings,primarily due to operators’insufficient understanding and proficiency in both the features and established operating procedures of this *** October 2019,Professor Jingping Liang,Vice Chairman of the Society of Cariology and Endodontology,Chinese Stomatological Association,organized a consensus meeting with Chinese experts in endodontics and operative *** objective of this meeting was to establish a standard operation procedure for the dental operative ***,a consensus was reached and officially *** the span of about four years,the content of this consensus has been further developed and improved through practical experience.

关键词： operative surgery primarily

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微量元素对牙髓干细胞分化的影响

中华口腔医学杂志 2021年第6期56卷 604-607页

作者：梁梓添梁婷婷江千舟杨莉广州医科大学附属口腔医院牙体牙髓科·广州口腔疾病研究所·口腔医学重点实验室 510140

牙髓干细胞(dental pulp stem cell,DPSC)是牙髓及牙本质再生研究中关键的优选细胞,具有多向分化的能力。微量元素对DPSC分化的影响是近年口腔组织工程的研究热点。微量元素具有广泛的生理生化功能,一方面可直接调控DPSC分化、迁移和增... 详细信息

牙髓干细胞(dental pulp stem cell,DPSC)是牙髓及牙本质再生研究中关键的优选细胞,具有多向分化的能力。微量元素对DPSC分化的影响是近年口腔组织工程的研究热点。微量元素具有广泛的生理生化功能,一方面可直接调控DPSC分化、迁移和增殖能力;另一方面可通过发挥抗菌及免疫调节作用以及改变支架材料的理化特性,间接影响DPSC分化。明确微量元素在DPSC分化中的作用可为实现牙髓及牙本质再生提供更多的参考依据,本文就近年国内外关于微量元素对DPSC成牙向和成血管向分化的作用及机制研究进行综述。

关键词：痕量元素干细胞间质干细胞细胞分化牙髓干细胞

Heat Transfer and Friction Characteristics of Printed Circuit Heat Exchangers with Different Channel Structures for S-CO_(2) Power System

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Journal of Thermal Science 2024年第3期33卷 1132-1147页

作者： jiang Tao LI Mingjia Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’an710049China School of Mechanical Engineering Beijing Institute of TechnologyBeijing100081China

Printed circuit heat exchanger(PCHE)has been widely used in supercritical carbon dioxide(S-CO_(2))power systems because of its high heat transfer efficiency and good ***,due to the large variety of PCHE configurations,channel selection in practical applications lacks a ***,this paper discussed the heat transfer and friction characteristics and the synergy of three fields in the channel under the guidance of the field synergy principle for four typical PCHE ***,the comprehensive performance of four channels was ***,the heat transfer and friction factor correlations for S-CO_(2)in four channels were *** findings demonstrate that the synergy of velocity and pressure fields of the straight channel PCHE is better(β≈180°),so its resistance loss is relatively *** zigzag and sinusoidal wavy channels and the airfoil fins can reduce the angle a between the temperature gradient and velocity,thus enhancing the heat *** sinusoidal wavy channel can reduce flow resistance compared to the zigzag channel due to the rounded *** streamlined airfoil structure can guide the flow and reduce backflow,thus reducing resistance *** the range of Re studied in this paper,the maximum error of the proposed heat transfer and friction factor correlations of PCHE is 7.0%,which shows good fitting *** research in this paper can provide a reference for the selection and design of PCHE with different channel configurations.

关键词： printed circuit heat exchanger supercritical carbon dioxide typical channel structure field synergy analysis

An improved initial rotor position estimation method using high-frequency pulsating voltage injection for PMSM

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Defence Technology（防务技术） 2024年第3期33卷 19-29页

作者： Yang jiang Ming Cheng School of Electrical Engineering Southeast UniversityNanjing 210096China

High frequency pulsating voltage injection method is a good candidate for detecting the initial rotor position of permanent magnet synchronous ***,traditional methods require a large number of filters,which leads to the deterioration of system stability and dynamic *** order to solve these problems,a new signal demodulation method is proposed in this *** proposed new method can directly obtain the amplitude of high-frequency current,thus eliminating the use of filters,improving system stability and dynamic performance and saving the work of adjusting filter *** addition,a new magnetic polarity detection method is proposed,which is robust to current measurement ***,experiments verify the effectiveness of the method.

关键词： Initial position detection Signal demodulation algorithm Magnetic polarity detection Filter elimination

Co/CoO heterojunction rich in oxygen vacancies introduced by O2 plasma embedded in mesoporous walls of carbon nanoboxes covered with carbon nanotubes for rechargeable zinc-air battery

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Carbon Energy 2024年第7期6卷 14-25页

作者： Leijun Ye Weiheng Chen Zhong-Jie jiang Zhongqing jiang Key Laboratory of Optical Field Manipulation of Zhejiang Province Department of PhysicsZhejiang Sci-Tech UniversityHangzhouChina Department of Mechanical Engineering Ningbo University of TechnologyNingboChina Guangzhou Key Laboratory for Surface Chemistry of Energy Materials Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy MaterialsCollege of Environment and EnergySouth China University of TechnologyGuangzhouChina

Herein,Co/CoO heterojunction nanoparticles(NPs)rich in oxygen vacancies embedded in mesoporous walls of nitrogen-doped hollow carbon nanoboxes coupled with nitrogen-doped carbon nanotubes(P-Co/CoOV@NHCNB@NCNT)are well designed through zeolite-imidazole framework(ZIF-67)carbonization,chemical vapor deposition,and O_(2) plasma *** a result,the threedimensional NHCNBs coupled with NCNTs and unique heterojunction with rich oxygen vacancies reduce the charge transport resistance and accelerate the catalytic reaction rate of the P-Co/CoOV@NHCNB@NCNT,and they display exceedingly good electrocatalytic performance for oxygen reduction reaction(ORR,halfwave potential[EORR,1/2=0.855 V *** hydrogen electrode])and oxygen evolution reaction(OER,overpotential(η_(OER,10)=377mV@10mA cm^(−2)),which exceeds that of the commercial Pt/C+RuO_(2) and most of the formerly reported ***,both the aqueous and flexible foldable all-solid-state rechargeable zinc-air batteries(ZABs)assembled with the P-Co/CoOV@NHCNB@NCNT catalyst reveal a large maximum power density and outstanding long-term cycling ***-principles density functional theory calculations show that the formation of heterojunctions and oxygen vacancies enhances conductivity,reduces reaction energy barriers,and accelerates reaction kinetics *** work opens up a new avenue for the facile construction of highly active,structurally stable,and cost-effective bifunctional catalysts for ZABs.

关键词： heterojunction oxygen evolution/reduction reaction oxygen vacancies rechargeable zinc–air battery three‐dimensional nitrogen‐doped hollow carbon nanoboxes

非编码RNA在骨代谢及骨重建中作用的研究进展

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实用医学杂志 2020年第3期36卷 420-424页

作者：黄竹杨岚江千舟郭吕华广州医科大学附属口腔医院广州口腔疾病研究所广州医科大学口腔医学重点实验室

非编码RNA(non⁃coding RNAs,ncRNAs)是一类不编码蛋白质的RNA分子,占据了人类基因组的大部分。研究发现,非编码RNA与成骨分化及骨代谢关系密切。目前,许多与骨相关疾病发病机制尚未明了。因此,本文重点介绍了三种常见非编码RNA(微小RNA... 详细信息

非编码RNA(non⁃coding RNAs,ncRNAs)是一类不编码蛋白质的RNA分子,占据了人类基因组的大部分。研究发现,非编码RNA与成骨分化及骨代谢关系密切。目前,许多与骨相关疾病发病机制尚未明了。因此,本文重点介绍了三种常见非编码RNA(微小RNA,长链非编码RNA和环状RNA)的分类,作用机制,对骨生长分化、骨代谢的影响,以及对骨相关疾病的影响等方面。

关键词：非编码RNA 骨代谢骨重建