bluuebunny/crossref_metadata_2025_split huggingface dataset:
Crestal Bone Changes in Different Implants Designs: A Prospective Clinical Trial
Authors: Caetano Gustavo M. , Pauletto Patrícia , Mezzomo Luis A. , Rivaldo Elken G. 
Published: December 2019

Abstract
Objective Several modifications, such as changes in the implant–abutment connection, have been suggested in studies on dental implants to better preserve the peri-implant bone level. The aim of this study was to prospectively compare crestal bone level changes between two different implant designs—tissue level (TL) and bone level (BL).
Materials and Methods The sample comprised 18 patients, on whom a total of 30 hydrophilic tissue- and bone level implants were placed (SLActive, Straumann Institut AG, Basel, Switzerland), in the posterior region of the maxilla or the mandible. Impressions were taken after 45 days of healing. Then, cemented-retained metalloceramic crowns were fabricated and installed. Marginal bone level changes were assessed by the paralleling technique of periapical radiographies, on both mesial and distal aspects of each implant, at the moment of the implant placement and after 1 year of loading. Photoshop software was used to perform linear measurements by a single and calibrated examiner.
Statistical Analysis The Mann–Whitney test at a 5% significance level was used to compare the bone changes among the implants assessed.
Results A significantly lower (p = 0.048) bone remodeling was observed on bone level implants (0.05 mm), when compared to tissue level implants (0.47 mm; p = 0.048). The average marginal bone level changes at the distal aspect did not show any statistically significant difference (p = 0.325).
Conclusions Tissue level implants presented greater bone loss in the mesial surface than bone level implants. Both designs presented stable and clinically acceptable bone crests.
In Vivo Evaluation of Operative Torque Generated by Two Nickel-Titanium Rotary Instruments during Root Canal Preparation
Authors: Gambarini Gianluca , Galli Massimo , Seracchiani Marco , Di Nardo Dario , Versiani Marco A. , Piasecki Lucila , Testarelli Luca 
Published: December 2019

Abstract
Objectives This in vivo study evaluated the operative torque and preparation time of ProTaper NEXT (Dentsply Maillefer; Ballaigues, Switzerland) and EdgeFile X7 (EdgeEndo; Albuquerque, New Mexico, United States) rotary systems during root canal preparation of maxillary premolars.
Materials and Methods Ten double-rooted maxillary premolars with independent canals were selected. Each canal in each tooth was prepared with one of the rotary systems (n = 10), ProTaper NEXT or EdgeFile X7. The instruments were rotated at 300 rpm with maximum torque set at 2 N.cm using an electric motor (KaVo; Biberach, Germany) that automatically recorded torque values at every 1/10th of a second (ds).
Statistical Analysis Operative torque (N.cm) and preparation time (s) of the first shaping instrument (size 17/.04) of both rotary systems were recorded and statistically compared using the Mann–Whiney U test with a significance level set at 5%.
Results No instrument exhibited flute deformation or underwent intracanal failure. No differences were found between the instruments regarding the maximum (peak) torque values (p > 0.05). EdgeFile X7 17/.04 required significantly less preparation time (3.75 seconds interquartile range [IQR]: 3.2–9.0) than ProTaper NEXT X1 (15.45 seconds IQR: 8.35–21.1) (p < 0.05). The median operative torque values of ProTaper NEXT X1 (0.26 N.cm; IQR: 0.18–0.49) were significantly higher compared with EdgeFile X7 17/.04 (0.09 N.cm; IQR: 0.05–0.17) (p < 0.05).
Conclusions Although no difference was found between the median peak torque values of ProTaper NEXT X1 and EdgeFile X7 17/.04 instruments, the operative torque and instrumentation time results were impacted by their different designs and alloys during clinical preparation of root canals.
Technical Quality of Root Canal Filling in Preclinical Training at Strasbourg University Using Two Teaching Protocols
Authors: Kharouf Naji , Hemmerlé Joseph , Haikel Youssef , Mancino Davide 
Published: December 2019

Abstract
Objectives The aim of this study was to compare two teaching protocols according to the technical quality of root canal therapy (RCT) and the procedural errors occurred in preclinical training.
Materials and Methods Two different groups of students were concerned. The first one (G1) performed a crown-down technique to shape the root canal systems and cold lateral condensation technique to fill them. The second one (G2) performed a step-down technique without initial manual scouting to shape the root canal systems, and cold hydraulic condensation technique, to fill them. G2 used clinical operative microscope to check the access cavity preparation.
Statistical Analysis The quality of RCTs and procedural errors were recorded and analyzed using chi-squared test and t-test.
Results Four hundred sixty-eight root canals from 152 maxillary molars were treated by the G1 students: 46.6% canals were judged as acceptable. Four hundred sixty-nine root canals from 152 mandibular molars were treated by G1: 58.8% canals were judged as acceptable. Five hundred fifteen root canals from 156 maxillary molars were treated by G2 students: 84.1% canals were judged as acceptable. Four hundred ninety-three root canals from 156 mandibular molars were treated by G2: 90.9% canals were judged as acceptable. Among the errors, the incidence of “ledges” and “fractured instruments” was statistically significant in G1 compared with G2, both on maxillary and on mandibular molars.
Conclusions The molar RCTs performed by G2, who got benefit from the new teaching protocol, resulted in a better quality of root filling and in fewer procedural errors compared with the molar RCTs performed by G1.
Root Dimensions in Patients with Mild Hypodontia and a Control Group
Authors: Khalaf Khaled , Seraj Zahra , Hussein Hesham , Mando Mahmoud 
Published: December 2019

Abstract
Objectives The aim of this study was to compare root dimensions (length and mesiodistal widths) between subjects with mild hypodontia and an age- and sex-matched control group.
Materials and Methods Root dimension measurements of all permanent teeth excluding third molars were made on standardly taken orthopantomograms of 50 individuals (25 hypodontia and 25 controls) attending the University of Sharjah Dental Hospital. The length and two mesiodistal widths were measured for each fully formed root. The length of the root was measured digitally by drawing a line from the midpoint and bisecting the mesiodistal cemento-enamel junction (CEJ) of the tooth and extended to its apex. The mesiodistal widths of each root were measured at the cervical region and at half way of and perpendicular to the length of the root.
Statistical Analysis Two sample t-tests were used to compare root dimension measurements between the hypodontia and control groups.
Results There were no significant differences between genders with regard to root length or widths measurements, and therefore genders were combined for further analysis. Patients with hypodontia have significantly shorter root lengths than controls for the upper central incisors, upper canines, first premolars, and lower first molars (p < 0.05). Similarly, root width at the midpoint of the root was found to be less in hypodontia group than that in controls for the upper central incisors, lower first premolars, upper first molars, and all second premolars (p < 0.05). Similar pattern of differences was found with regard to the root width at the cervical region (p < 0.05).
Conclusions Patients with hypodontia have shorter and narrower roots of the whole permanent dentition except the upper lateral incisors, lower incisors, lower canines, and all second molars when compared with controls. In effect, this may affect the orthodontic treatment planning and implant placement.
A Case in Which Focal Convulsion Was the Initial Sign of Fatal Aortic Dissection
Authors: Yanagawa Youichi , Ishikawa Kouhei , Nagasawa Hiroki , Takeuchi Ikuto , Jitsuiki Kei , Madokoro Shunsuke , Kondo Akihiko , Ohsaka Hiromichi , Omori Kazuhiko 
Published: December 2019

AbstractFocal convulsion as an initial sign of aortic dissection is extremely rare. Type A aortic dissection involves the aortic arch, which may result in seizure either through the extension of the dissection into the common carotid arteries or through thromboembolism or cerebral hypoperfusion. Physicians should perform whole body computed tomography to determine whether or not dissection is present when treating patients with convulsion and a high level of fibrin degradation products.
Cytotoxicity Evaluation of Minimum Antibacterial Values of Different Medicaments Used in Endodontic Regenerative Procedures
Authors: Khoshkhounejad Mehrfam , Sobhi Afshar Mahsa , Jabalameli Fereshteh , Emaneini Mohammad , Sharifian Mohammadreza 
Published: December 2019

Abstract
Objectives This study aimed to evaluate the cytotoxicity of minimum antibacterial values of medicaments used in endodontic regeneration on stem cells.
Materials and Methods “Minimum inhibitory concentration,” “minimum bactericidal concentration,” and “minimum biofilm inhibitory concentration” of triple and double antibiotic paste, a modified triple antibiotic paste (minocycline replaced by clindamycin), Augmentin, and calcium hydroxide were determined using Enterococcus faecalis (ATCC 29212) by microtiter plate method. Direct cytotoxic effects of drugs were evaluated by lactate dehydrogenase and water-soluble tetrazolium salt-1 assays using stem cells of apical papilla obtained from immature third molars via enzymatic digestion.
Statistical Analysis Data were analyzed using IBM SPSS Statistics 24, one-way analysis of variance and post hoc comparisons. The statistical power was set at p < 0.05.
Results All medicaments caused similar cytotoxicity and cell proliferation at “minimum inhibitory concentration” (p > 0.05) except Augmentin which was significantly more toxic than others (p < 0.05). At “minimum bactericidal concentration,” calcium hydroxide was more toxic than other drugs (p < 0.001), but its adverse effect on cell proliferation was the same as Augmentin (p > 0.05). Triple and double antibiotic paste revealed similar favorable effects in terms of toxicity and proliferation rate at most of the tested concentrations (p > 0.05). At “minimum biofilm inhibitory concentration” both the modified paste and Augmentin caused less proliferation rate than triple and double antibiotic paste (p < 0.001and p < 0.05, respectively) and Augmentin induced more cytotoxicity (p < 0.05).
Conclusions Considering the antimicrobial potency, triple antibiotic paste seems to be the safest drug for the stem cells of apical papilla, while Augmentin may have some adverse effects.
Proteome-wide observation of the phenomenon of life on the edge of solubility
Authors: Vecchi Giulia , Sormanni Pietro , Mannini Benedetta , Vandelli Andrea , Tartaglia Gian Gaetano , Dobson Christopher M. , Hartl F. Ulrich , Vendruscolo Michele 
Published: December 2019

Significance
More than a decade ago, we put forward the “life on the edge of solubility” hypothesis, according to which proteins are expressed in the cellular environment at levels close to their solubility limits. This observation was based on the analysis of a small number of proteins for which solubility and cellular concentration information was available at the time. To confirm this hypothesis we have now taken advantage of recent advances in mass spectrometry that have enabled the proteome-wide analysis of protein concentrations in both the soluble and insoluble forms. We have been able to show in this way that the vast majority of proteins in a model organism are indeed expressed above their solubility limits, and to investigate the consequences of this phenomenon.
Assessment of Environmental Degradation Costs: A Case Study of Beijing and Tianze Agricultural Parks
Authors: Zhang Liufen , Zhang Zebin , Ma Yanxin , Liu Xiangdong 
Published: December 2019

Abstract
Nowadays, the community of human destiny has gradually become the consensus of people. The pursuit of economic benefits and the neglect of ecological benefits will bring serious consequences. Therefore, predicting the cost of environmental degradation for managers is an urgent problem we need to solve.
We establish a mathematical model to predict the cost of environmental degradation. And we ignore some insignificant factors and choose seven factors as indicators in our model under the consideration of actuality. To make the model more intuitive, we transform environmental degradation costs into ecosystem services values and calculate the value of each service in the ecosystem separately. At the same time, we use Analytic Hierarchy Process to calculate the weight of each service according to the judgment matrix. Then we introduce a concept in economics “Weighted Average Cost of Capital (WACC)”. Hence, we can derive the final cost of environmental degradation. Next, we take Beijing’s construction as an example of a large national project and Tianze agricultural park as an example of a small community-based project to estimate their respective degradation costs.
As for the effectiveness analysis, we use polynomial 7-th approximation to fit curve and prove its effectiveness successfully. According to the data we get from fitting curve, we analyze the ideal environment level of 2020. The result shows that land use projects exist many shortcomings and we give land use project planners and managers some advice to help them reach the ideal environment level in 2020.
Since ecosystem service valuation is pretty complex and some indicators are influenced by humanity factor, we cannot ensure the accuracy of our calculation. We improve our model and add fuzzy mathematic method into AHP. By using Fuzzy Analytic Hierarchy Process, we can let the weight change automatically over time. Therefore, we success in improving our model and adding time factor into our improved model.
Finally, we analyze our works and then discuss strengths and weaknesses of our model.
FFT based unambiguous acquisition method for BOC modulation signal
Authors: Li Bin , Qi Dan , Zhang Shaozhen , Cheng Dan , Mu Jun , Yan Zheng 
Published: December 2019

Abstract
This paper presents an unambiguous acquisition algorithm for Binary Offset Carrier (BOC) modulation signals, which is adopted by modernized Global Navigation Satellite System (GNSS). By utilizing FFT, the spectrum of BOC signals is derived. This paper proposes an unambiguous acquisition method based on FFT to get rid of the BOC modulation drawback. By utilizing FFT, the spectrum of BOC signal is derived. The up and down sideband are separated in frequency domain by rectangular function, which means sideband filtering. Due to sparsity of filtered BOC spectrum, frequency compression method is proposed to reduce the number of IFFT points. Theoretical and simulation results show that this technique completely removes the ambiguity threat in acquisition process.
Predict post spreading in online social networks based on independent cascade model
Authors: Yakovleva O V , Rudakov I V , Stroganov Y V 
Published: December 2019

Abstract
Today, online social networks play an important role in the information spreading. Based on the social influence effect, posts can be spread across the network by repost mechanism. This paper addresses the problem of using independent cascade model for repost dynamics prediction in online social networks. A spreading post probability between two connected users is presented as function of preassigned features and coefficients fitted by the EM algorithm. This approach combines ideas of previously proposed methods. The list of considered features is composed and it includes users, their relationships and posts features. The iteratively solved by the Newton’s method system of equation is derived for independent cascade model to obtain coefficients of a probability function. The experiments with the Sina Weibo dataset show that the EM algorithm more accurately estimates unknown coefficients of probability function that the logistic regression method. Since actual values of diffusion probabilities are unknown for a real network, a problem of their estimation is considered as a binary classification problem to determine accuracy of various methods. The independent cascade model tuned by proposed method of diffusion probability estimation was verified. The experimental results show than the model can commendably predict the reposting dynamics for a given post.
Design of component cooling water system for Comprehensive Research Facilities in Support of CFETR
Authors: Li Weibao , Hu Jiansheng , Yang Lei , Guo Bin , Zhu Lili , Zhou Jinxuan , Liu Zhe , Yao Lidong , Xu Qianglin 
Published: December 2019

Abstract
Comprehensive Research Facilities in Support of CFETR is aimed to demonstrate a comprehensive research platform with the highest parameters and the most complete functions in the field of magnetic confinement. The cooling water system is an integral part of a comprehensive research platform. The cooling water system includes component cooling water system (CCWS), chilled water system (CHWS) and heat removal system (HRS). The component cooling water system is mainly responsible for transferring the heat load generated by each subsystem during the operation, preventing the system from overheating. This paper presents the thermal hydraulic design of CCWS for Comprehensive Research Facilities in Support of CFETR. Through the development of the thermal hydraulic model of the CCWS, the AFT Fathom code is used to calculate the key thermal hydraulic parameters and predict the thermal hydraulic behaviour. Based on the results of thermal hydraulic analysis, the key thermal hydraulic parameters have been plotted to evaluate the capability of CCWS, such as the required pump head, inlet pressure, flow rate, inlet and outlet temperature and pressure drop of the customer. This paper will provide design guidance for the construction of component cooling water system (CCWS) for Comprehensive Research Facilities in Support of CFETR.
Research on pedestrian detection system based on intelligent terminal with limited computing ability
Authors: Chen Ning , Li Menglu , Liu Zhijian 
Published: December 2019

Abstract
Pedestrian detection technology is the use of computer vision technology to determine whether there are pedestrians in static images or video images, and accurately mark pedestrians. Intelligent vehicles, intelligent monitoring, human behaviour analysis and other aspects are related to pedestrian detection technology, so pedestrian detection technology has been widely concerned by all walks of life. However, in some application environments, the network setting is flexible and the location of the device can be changed at any time, so it is difficult to establish a pedestrian detection system by wired way, and the pedestrian detection system can only be established through WSN. It is necessary to consider how to complete pedestrian detection through intelligent terminal under the condition of limited computing power. Many researchers have put forward a lot of algorithms, which are constantly optimized, but there are still many problems to be solved in practical application. In this paper, aiming at the intelligent terminal in WSN environment with limited computing power, a pedestrian detection system based on HOG+SVM is designed, which can detect moving pedestrians in video in real time. The detection system is mainly composed of detection algorithm and video acquisition module. After the test of INRIA and CVC data set, the accuracy of the detection algorithm in this paper is 89.06%. This method is tested under the intelligent terminal with limited computing power, with a good detection effect.
Optimization of helicopter blade section based on multi-objective optimization algorithm
Authors: Wang Shuai , Wang Guohua 
Published: December 2019

Abstract
This paper aims to find a better performance multi-objective optimization algorithm to optimize the helicopter blade section structure, so that the optimized blade section characteristics are better. Optimization objectives include the section quality linear density of the blade and the section stiffness characteristics of the blade. In this paper, three multi-objective optimization algorithms including non-dominated sorting genetic algorithm II (NSGA-II), non-dominated sorting genetic algorithm III (NSGA-III) and multi-objective evolutionary algorithm based on decomposition (MOEA/D) algorithm are used to optimize the blade section. The performance evaluation results of the three algorithms are evaluated by inverted generation distance(IGD). The calculation results show that the MOEA/D algorithm has better convergence, uniformity and extensiveness, and the comprehensive performance is better than other algorithms in high-dimensional multi-objective optimization. After optimization by the algorithm, the quality linear density of the section is reduced by 1.8%, the torsional stiffness of section is increased by 2.1%., the shimming stiffness of section is decreased by 1.9%, the waving stiffness of section is decreased by 1.7%, and the tensile stiffness is increased by 0.9 %.
Evolutionary dynamics of Chinese tourism market extremely low-priced strategies based on wright-fisher processes
Authors: Lv Wanqing , Wang Yijie , Ni Xiangli 
Published: December 2019

AbstractExtremely low-priced of package tours is an important cause of Chinese tourism market price disorder. Regulating the price of package tours in Chinese tourism market, can solve the problem of Chinese tourism market price disorder. In order to research the reason of extremely low package tours price, consider the stochastic dynamics of N homogeneous mixed travel agency pricing strategies, and each travel agency could choose Extremely low-pricing or regular pricing. Based on Wright-Fisher processes, we obtain the dominant strategy of Extremely low-pricing and regular pricing under the weak selectivity in the package tours price setting, when the travel agency groups are finite. And then further verify these conditions by numerical simulation. The simulation shows that the Price elasticity of tourism demand, the transparency of the tourism market and the degree of government supervision strength have important effects on the stochastic evolution of package tours price setting. Reducing the demand elasticity of tourism market, increasing the transparency of the tourism market and the degree of government supervision strength can make travel agency choose regular pricing and solve chaotic of Chinese tourism market further. Therefore, this paper puts the suggestion of “two increases and one decrease” for the development of Chinese tourism market.