The variation in the number of roots and canals morphology of permanent mandibular first molar teeth by using cone beam computed tomography imaging in a sample of Erbil city by Hassan Ali Mahmoyd Albarzanji, Alaa Muhamed Sadiq Muhamed Jamil

“…Results: The result indicated that the first molar tooth had two roots one mesial and one distal, while about the numbers of extra roots the result indicated that only the distal root showed five extra roots (3.5%). …”
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Pica practices, anemia, and oral health outcomes: a systemic review by Brenda A. Z. Abu, Abigail Morrissey, Yan Wu, Daniel A. Castillo, Rachel Becker, TongTong Wu, Kevin Fiscella, Steven Gill, Jin Xiao

“…Conclusion Pica was strongly associated with anemia and IDA. Tooth abrasion and dental caries were observed among pica users. …”
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Generalized Aggressive Periodontitis and Its Treatment Options: Case Reports and Review of the Literature by T. Roshna, K. Nandakumar

“…Generalized aggressive periodontitis results in rapid destruction of the periodontium and can lead to early tooth loss in the affected individuals if not diagnosed early and treated appropriately. …”
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RESEARCH ON PROFILE MODIFICATION OF INVOLUTE SPLINE COUPLING by HU JuanJuan, HU JianFa, TAN YuanQiang, JIANG ShengQiang, YANG ShiPing

“…The appropriate profile modification of involute spline coupling can effectively reduce the maximum contact pressure and the phenomena of concentrated contact stress,and improve the tooth surface contact pressure distribution,and mitigate the adverse effects caused by angular misalignment.…”
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Research on Load Characteristic of Star Gear Transmission System of Turbofan Engine by Fanqiu Meng, Lianwang Gu, Changqing Ma

“…The dynamics model considers the relationship between the rotational motion of the star gear，the time-varying support stiffness of the bearing，the meshing stiffness of the gear，as well as the relationship between the multi tooth meshing and the comprehensive error. The influence of bearing position on input shaft and output shaft on floating quantity and load distribution characteristics is studied. …”
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INVESTIGATION ON DYNAMIC CHARACTERISTIC OF CYLINDER GEARS AND SIMULATION BASED ON ADAMS by CHENG YanLi, XIAO ZhengMing, WANG Xu

“…Translational-rotational coupling dynamic model of the cylinder gear transmission system was established using the lumped-parameter method,which considered the time-varying mesh stiffness,mesh damping,friction of tooth surface.According to the design parameters,Runge-Kutta was used to get the vibration displacements of each gear and the mesh force of the gear pair. …”
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Window decompression surgery for a large radicular cyst in a 7-year-old patient: A case report by Guan-jie Song, Lu Wang, Li-rong Gao

“…At the 9-month follow-up, the radicular cyst had healed and the impacted tooth had erupted. The aim of this study was to explore the clinical effectiveness of WDS for impacted teeth within root radicular cysts.…”
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Study on Vibration Reduction Method by Gear Staggering Phase Tuning by Chen Gang, Wei Jing, Ju Guoqiang, Zhang Jiaxiong

“…In this study, a novel method of staggered tooth phase of gears is proposed, the meshing principle of staggered phase tuning gears is studied, the calculation formula of time-varying meshing stiffness of staggered phase tuning gears is derived, and the mapping relationship between staggered phase and vibration response is studied. …”
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Biofilm architecture and dynamics of the oral ecosystem by Rina Rani Ray

“…Undiagnosed and untreated oral biofilm can lead to severe diseases like periodontitis and eventual tooth loss. Therefore, studying the architecture and dynamics of oral biofilms is essential and can be achieved through image analysis and modern technologies, such as AI-enabled technologies and surface topography-adaptive robotic superstructures.…”
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Paris, capitale de la déviance ecclésiastique au siècle des Lumières by Myriam Deniel-Ternant

“…Paris is subject to extremely dense police coverage, allowing every citizen or visitor’s intimacy to be gone over with a fine-tooth comb. Clerics are soon targeted in an actual « priest-hunt », according to people from that time. …”
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Unloading Groove Optimization and the Inner Flow-field Simulation Analysis of the Variable Displacement External Gear Pump by Gao Jiahe, Wang Yansong, Zhao Lihui, Guo Hui, Li Jinguo

“…A CFD model of a variable displacement external gear pump is established.The quantitative analysis method is applied to analyze characteristics of the pump inner flow field.The accuracy of the established model is verified by comparing the flux simulated and corresponding tested data.The tooth width formula of gear meshing is obtained.Through oil pressure analysis in the trapped oil area,an optimization scheme with a wedge-shape unloading groove added at the upper piston of the driven gear is proposed,which effectively reduces the pressure fluctuation of trapped oil area.The study results show that,under the condition of the same pump flux,the optimized unloading groove can reduce the pressure fluctuations in the suction and discharge chambers by 12.3% and 8%,respectively.The work is helpful for design and development of the variable displacement external gear pump.…”
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Design and Research of the Gear Modification of Wind Turbine Gearbox by Chen Fangming, Wan Qingliang

“…The helix line modification of pinion is determined by the analysis of the deformation of the pinion,through the mathematical modeling of gear dynamics,a theoretical basis for transmission error is provided.The gear modification of output gear of a 2 MW wind turbine gearbox is carried out. The tooth profile modification of gear pair is carried out by using the KISSsoft software. …”
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Simulation Analysis of the Planetary Reducer Mechanism of Shearer under Extreme Condition by Zhao Lijuan, Gai Dongmin, Tian Zhen, Liu Xunan, Lan Jinbao

“…Through the simulation for the planetary reduction mechanism after gear modification,it is found that the maximum equivalent stress is less than the material allowable stress,and the tooth surface fatigue life is greatly improved. An important reference for the study on gear dynamics is provided.…”
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Endodontic Management of Maxillary Second Molar with Two Palatal Roots: A Report of Two Cases by Surbhi Patel, Pawan Patel

“…Endodontic treatment may sometimes fail because morphological features of the tooth adversely affect the treatment protocol. Maxillary second molars are recognized as usually having a single palatal root with a single palatal canal. …”
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Sugar Alcohols, Caries Incidence, and Remineralization of Caries Lesions: A Literature Review by Kauko K. Mäkinen

“…Habitual use of xylitol, a sugar alcohol of the pentitol type, can be associated with significant reduction in caries incidence and with tooth remineralization. Other dietary polyols that can remarkably lower the incidence of caries include erythritol which is a tetritol-type alditol. …”
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Simulation Analysis of the GearModification of Wind Power Gearbox based on Romax by Li Ruiliang, Mu Song, Wang Chunxiu, Su Youliang

“…At present,the gearboxes are faced with the problems of high failure rate,large vibration and noise,short service life,etc,and the gear modification is an effective means to reduce vibration and noise,extend life,which is proved by practical experience at home and abroad for many years.With the introduction of some professional gear software or wind turbine analysis software from abroad,the work efficiency is greatly improved,and the extra cost due to experimental verification is also reduced.With the using of RomaxWIND excellent load distribution analysis function and on the basis of the theory of gear modification,the statics simulation analysis of the gearbox is carried out through the RomaxWIND software under the equivalent loads.According to the load distribution on the tooth surface of gear,transmission errors and other parameters,the length,amount and curve of modification of the high-speed gear is determined in the end.The conclusions can provide reference for gear modification.…”
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Research of the Allowable Velocity of Chain Drive of Quantitative Conveyor by Shang Shibo, Wang Honglei, Yuan Hua

“…According to the loading speed requirements of the 50 tons skip loading by quantitative conveyor,to improve the operation reliability of the transmission chain under overload and at the velocity of 1.2m/s,the combination and optimization of sprocket tooth z,chain pitch pand allowable speed v optimization are solved.A method to predict the chain allowable speed is presented,according to the existing small-pitch chain parameters from GB/T 5269-1985,the theoretical formula and the relationship curves between p&vare determined by MATLAB data fitting model,the large pitch chain allowable speed is solved.The calculation shows that p=200 &z=12meet the requirements of the loading speed and nearly consistent with TSUBAKI’s sample.The results provide a theoretical basis for design and ordering of prototype,also can provide a reference for parameter selection of large chain.…”
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Application and Development of ANSYS Parametric Modeling System of RV Reducer by Feng Yubin, Xu Honghai, Liu Xueao, Wang Wentao

“…The geometric parameters are defined according to structural features of RV reducer and the secondary development of ANSYS for parametric modeling is finished by using ANSYS parametric design language（ APDL） and user interface design language（ UIDL） based on tooth profile equation of curtate cycloid and involute. …”
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Effect of Symmetry Error and Error Coupling Compensation on Meshing Characteristic of Herringbone Gear by Weiguo Li, Guangbin Yu, Hancheng Mao, Lin Fu

“…In order to study the effect of the symmetry error generated by processing on the herringbone character gear meshing transmission， improve the stability of the transmission， according to the structural characteristics of herringbone gear and gear geometry contact model， consider the tooth surface gap， force equilibrium conditions and axial displacement， the herringbone gear bearing contact analysis model of symmetry error is established. …”
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THE NEED FOR DENTAL TREATMENT IN PATIENTS WITH SENILE DEMENTIA by Oana Cristina Cretu, Marius Cocu, Elena Rodica Popescu

“…Due to cognitive decline, patients with senile dementia often struggle with maintaining oral hygiene, leading to conditions like tooth decay, periodontal disease, and infections. …”
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