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Wear behavior of CAD-CAM zirconia, ceramic, and 3D printed nano-hybrid resin crowns for the restoration of primary and permanent molars: An in vitro study

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Journal of Prosthetic Dentistry 2025年

作者： Ghabchi, Behrang Mavi, Fırat Çömlekoğlu, Erhan Saklakoğlu, Ibrahim Etem Uzel, Ilhan PhD candidate Department of Pedodontics School of Dentistry Ege University Izmir Turkey PhD candidate Department of Mechanical Engineering Faculty of Engineering Ege University Izmir Turkey Department of Prosthodontics School of Dentistry Ege University Izmir Turkey Department of Mechanical Engineering Faculty of Engineering Ege University Izmir Turkey Department of Pedodontics School of Dentistry Ege University Izmir Turkey

Statement of problem: Early childhood caries is one the world's most common problems in infants and treatment of posterior teeth with esthetic crowns in a low rate of wear on opposite dentition is a challenge for pediatric dentists. Purpose: The purpose of this in vitro study was to evaluate the wear behavior of the tooth colored crown materials and the opposing teeth in using different esthetic crown materials in the mixed dentition period. Material and methods: The following tooth type and crown materials were considered in the experiment. Primary molars consist of first and second molars that were close to exfoliation or needed to be extracted because of orthodontic treatment and were caries free and with no restorations. Permanent teeth consisted of third molars that were caries free and with no restorations. Three different types of crown materials were used: nano-hybrid resin (VarseoSmile Crown ^plus;Bego GmbH), tetragonal zirconia polycrystalline stabilized with 3 mol% yttria (G-CERAM;Atlas Enta), and lithium disilicate glass-ceramic (IPS *** CAD;Ivoclar AG). The wear test was performed in an artificial saliva environment (pH=6.7), based on the pin-on-plate technique, for a 2-mm stroke, under a compressive force of 30-N, at a frequency of 2-Hz and with 10 000, 20 000, and 30 000 cycles. A multi-way ANOVA statistical method was used (α=.05). Results: Wear of the opposing teeth by the glass-ceramic was greater than by the nano-hybrid resin or zirconia materials (P<.05). All 3 crown materials wore primary teeth more than permanent teeth (P<.05). Compared with nano-hybrid resin, zirconia led to more wear of the opposing tooth (P<.05). The wear behavior of the nano-hybrid resin was more predictable compared with the other 2 materials. Conclusions: Zirconia and lithium disilicate-based glass-ceramic materials caused more wear on both primary and permanent teeth compared with nano-hybrid materials, yet exhibited less wear themselves when opposed by prima

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Clinical Biomarkers to Evaluate Next Generation Inhaled Tobacco Products’ Effect in the Oral Cavity: a Narrative Review

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Current Oral Health Reports 2024年第1期11卷 30-39页

作者： Sarles, S. Emma Hensel, Edward C. Rahman, Irfan Robinson, Risa J. Biomedical and Chemical Engineering PhD Program Rochester Institute of Technology Rochester NY United States Department of Mechanical Engineering Respiratory Technologies Lab Rochester Institute of Technology Rochester NY United States Department of Environmental Medicine Rahman Lab University of Rochester Medical Center Rochester NY United States

Purpose of Review: Biomarkers in the oral cavity of users of next generation tobacco products, such as electronic cigarettes (EC), provide data about effects on oral and systemic health and help predict long-term health effects, such as cardiovascular, respiratory, and periodontal disease. Despite oral cavity health provides, translation of findings to regulatory outcomes around EC is lacking. A review of the current state of the art in use of clinical biomarkers of the oral cavity was conducted. This identified inconsistencies and gaps in tobacco regulatory science to address how to improve clinical studies for screening tobacco products and studying disease. Recent Findings: The review identified that saliva and buccal biopsies provide dependable biomarkers of oral and systemic health when several parameters of health are standardized and considered. Inflammatory cytokines in oral tissue and biofluids of EC users are conflicting due to differences in sample collection and analysis techniques. Salivary C-reactive protein levels provide information about systemic inflammation and risk of cardiovascular disease, but analysis of this biomarker in the oral cavity does not appear in the current literature. The oral microbiome plays a significant role in human health and may be a useful tool to study systemic effects of tobacco products non-invasively, yet inconsistencies in reporting metrics make studies difficult to compare or translate into tangible outcomes. Effects of tobacco product use on hard dental tissue are not widely investigated despite correlations observed between e-cigarette use and broken teeth. Summary: This review provides a comprehensive update on clinical biomarkers in systemic and oral diseases associated with emerging nicotine products. © 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.

关键词： Biomarkers Electronic cigarette Oral health Tobacco regulatory science Vaping

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Interaction-Aware Merging in Mixed Traffic with Integrated Game-theoretic Predictive Control and Inverse Differential Game

Interaction-Aware Merging in Mixed Traffic with Integrated G...

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IEEE Symposium on Intelligent Vehicle

作者： Mohamed-Khalil Bouzidi Ehsan Hashemi Continental AG and PhD Candidate at the Free University Berlin Germany Department of Mechanical Engineering University of Alberta Edmonton AB Canada

This paper presents an interaction-aware motion planning and control framework for time-critical traffic scenarios in which interaction with vehicles driven by humans is required. For safe motion planning the proposed method considers interaction between the automated driving system and other vehicles using game theory. The framework includes a novel inverse differential game based on a LSTM to estimate the human driver’s objective function online. Then, a game-theoretic predictive controller utilizes these estimates for controlling the automated driving system and predicting the trajectory of the human-driven vehicle. The developed framework is validated in several safety-critical scenarios and testing conditions using CarSim high-fidelity simulations including human-in-the-loop case studies with six different test subjects.

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Effect of process parameters on surface roughness of 316L stainless steel coated 3D printed PLA parts

Effect of process parameters on surface roughness of 316L st...

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作者： Kumar, Rakesh Kumar, Manoj Singh Chohan, Jasgurpreet Kumar, Santosh PhD Research Scholar Department of Mechanical Engineering Chandigarh University Gharuan Punjab Mohali India Department of Regulatory Affair Auxein Medical Private Limited Haryana India Department of Mechanical Engineering Chandigarh University Gharuan Punjab Mohali India Department of Mechanical Engineering Chandigarh Group of Colleges Landran Punjab Mohali India

3D printing is a novel and rapid emerging technology. Among distinct 3D printing techniques, Fusion deposition modeling (FDM) is one of the cost effective 3D printing technique. In addition, in FDM process, polylactic acid (PLA) filaments are generally utilized. However, the quality of FDM fabricated part depends upon many processing parameters. Hence, in the current investigation PLA samples have been fabricated using FDM at distinct parameters. Further, the fabricated samples were coated at different levels (50 µm, 100 µm and 150 µm) with 316L stainless steel using electric arc spray. Finally, the surface roughness of the fabricated samples was measured. The result showed that the, surface roughness is higher (14.9 µm) at raster orientation (30°), top and bottom layer (2), and coating thickness (50 µm). On the other hand the surface roughness was found to be lower at raster orientation (60°), top and bottom layer (4), and coating thickness (150 µm). © 2022

关键词： Surface roughness

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Heterojunction and co-catalyst engineering of bismuth vanadate by nickel molybdenum oxide and carbon quantum dot decorations for photoelectrochemical water splitting

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International Journal of Hydrogen Energy 2024年 51卷 1099-1108页

作者： Kuo, Tsung-Rong Chiou, Yu-Tai Huang, Hsiao-Wen Kongvarhodom, Chutima Saukani, Muhammad Yougbaré, Sibidou Chen, Hung-Ming Lin, Lu-Yin Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei Taiwan Department of Chemical Engineering King Mongkut's University of Technology Thonburi 126 Pracha-u-thit Toong-kru Bangkok10140 Thailand Department of Mechanical Engineering Faculty of Engineering Universitas Islam Kalimantan MAB Jl. Adhyaksa No. 2 Banjarmasin70124 Indonesia /Nanoro 03 B.P 7192 Ouagadougou03 Burkina Faso Gingen technology Co. LTD. Rm. 7 10F. No.189 Sec. 2 Keelung Rd. Xinyi Dist. Taipei11054 Taiwan

Improving the charge diffusion length and water oxidation kinetics of bismuth vanadate (BiVO4) is essential to achieve better photoelectrochemical catalytic ability for water oxidation. Establishing heterojunctions and incorporating co-catalysts with BiVO4 create facile charge transfer paths and generate more water oxidation reactions. In this work, nickel molybdenum oxide (NM) and carbon quantum dot (CQD) are firstly deposited on BiVO4 by hydrothermal and soaking processes to design an efficient co-catalyst/photocatalyst system for water oxidation. The depositing amount of CQD is optimized to balance contributions of CQD and NM as the hole sink and the light-to-electron generator, respectively. The highest photocurrent densities of 2.2 and 3.9 mA/cm2 are achieved for BiVO4/NM/CQD in the electrolyte without and with hole scavenger, respectively. The BiVO4 electrode only shows a photocurrent density of 1.2 mA/cm2 in the electrolyte without hole scavenger. The best photoelectrochemical catalytic ability of BiVO4/NM/CQD is approached by the reduced charge-transfer resistance and charge recombination as well as the enhancement on carrier densities. The excellent long-term stability with the photocurrent retention of 90% under illumination for 24 h is also obtained for BiVO4/NM/CQD. This study opens a blueprint on designing efficient catalysts for water oxidation by incorporating heterojunction and co-catalyst materials simultaneously. © 2023 Hydrogen Energy Publications LLC

关键词： Heterojunctions

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Efficiently catalyzing photo-oxidation of water by surface engineering of bismuth vanadate with nickel molybdenum oxide coverages

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International Journal of Hydrogen Energy 2024年 51卷 613-622页

作者： Kuo, Tsung-Rong Huang, Hsiao-Wen Kongvarhodom, Chutima Saukani, Muhammad Yougbaré, Sibidou Chen, Hung-Ming Lin, Lu-Yin International PhD Program in Biomedical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Graduate Institute of Nanomedicine and Medical Engineering College of Biomedical Engineering Taipei Medical University Taipei11031 Taiwan Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei Taiwan Department of Chemical Engineering King Mongkut's University of Technology Thonburi 126 Pracha-u-thit Toong-kru Bangkok10140 Thailand Department of Mechanical Engineering Faculty of Engineering Universitas Islam Kalimantan MAB Jl. Adhyaksa No. 2 Banjarmasin70124 Indonesia /Nanoro 03 B.P 7192 Ouagadougou 03 Burkina Faso Gingen Technology Co. LTD. Rm. 7 10F. No.189 Sec. 2 Keelung Rd. Xinyi Dist. Taipei11054 Taiwan

Bismuth vanadate with suitable band edges is one of the efficient photocatalysts for water oxidation. Establishing heterojunction can improve electron diffusion lengths and photocatalytic ability of BiVO4. In this work, nickel molybdenum oxide (Ni–Mo–O) and BiVO4 heterojunction is established by the hydrothermal process with different nickel to molybdenum precursor ratios. The Ni–Mo–O/BiVO4 electrode is applied as photoanodes for water oxidation. The growth mechanism of Ni–Mo–O on BiVO4 surface is proposed. The Ni–Mo–O deposition amount is optimized regarding to light absorbance and charger transportation. The largest photocurrent density of 1.72 mA/cm2 at 1.23 VRHE is obtained for the optimal NiMoO4/BiVO4 electrode (NM12) in the electrolyte without hole scavenger, while the pure BiVO4 electrode only shows a photocurrent density of 0.90 mA/cm2. The NM12 electrode even presented an impressive photocurrent density of 5.39 mA/cm2 at 1.23 VRHE in the electrolyte with the hole scavenger, owing to the abundant active sites and higher light absorbance as well as the favorable synergistic effects from its suitable Ni to Mo ratio. The NM12 electrode also shows excellent long-term stability with the photocurrent retention of 83% after illumination for 6500 s. This work opens a blueprint for establishing a novel heterojunction with the adjustable metal ratio and coverage on BiVO4. © 2023 Hydrogen Energy Publications LLC

关键词： Heterojunctions

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An Advanced Machine Learning Based Wear Optimization of Nano Particles Reinforced with High Strength Metal Matrix Composite 4

An Advanced Machine Learning Based Wear Optimization of Nano...

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4th International Conference on Smart Electronics and Communication, ICOSEC 2023

作者： Chinthamu, Narender Coumaressin, T. Lal, Bechoo Kakaravada, Ismail Khodade, Hrishikesh Haribhau Sundaramurthy, B. C to Candidate Enterprise Architect Wesco BostonMA United States Sri Manakula Vinayagar Engineering College Department of Mechanical Engineering Puducherry605107 India Kl Deemed University Department of Cse Andhra Pradesh Vaddeswaram India Vignan's Institute of Information Technology Department of Mechanical Engineering Visakhapatnam530049 India Rayat Shikshan Sanstha's S. M. Joshi College Department of Botany Hadapsar India Vinayaka Missions Kirupananda Variyar Engineering College Vinayaka Missions Research Foundation Deemed University Department of Computer Science and Engineering Tamilnadu Salem India

ISBN: (纸本)9798350300888

The use of Aluminium alloys in various industries has increased the demand for strong Aluminium alloys. To meet this demand, researchers are exploring new compositions for hybrid Aluminium metal matrix mixtures. In this study, an attempt was made to create a hybrid Aluminium alloy using stir-casting method and reinforcement with nanoparticles of boron nitride (BN) and nano zirconium dioxide (ZrO2) in 6070 Aluminium alloy. The Taguchi technique was used to enhance the stir-casting procedure limits that as agitation speed, agitation time, and temperature. The optimization was performed by varying the reinforcement content (0-12%) and the above-mentioned process parameters. The microhardness and wear resistance of the stir-cast materials were determined using a Vickers hardness tester and a wear tester. The results showed that the optimization of process parameters and reinforcement content had a significant impact on the microhardness and wear resistance of the Aluminium alloy. By analyzing the results, the optimum conditions for the stir-casting process were determined, leading to the production of Aluminium alloys with improved microhardness and reduced wear rate. In conclusion, this study demonstrated that the addition of BN and ZrO2 nanoparticles to 6070 Aluminium alloy using stir-casting method can enhance the microhardness and wear resistance of the alloy. The Taguchi method showed to be an effective tool in optimizing the stir-casting procedure limits, leading to the production of high-performance hybrid Aluminium alloys. Machine learning technique is used to forecast the responses and the developed neural model predicts response at higher accuracy. © 2023 IEEE.

关键词： Aluminum alloys

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An Improved Large Scale Data Analytics for Smart Cities with Multimodal Data Fusion 2

An Improved Large Scale Data Analytics for Smart Cities with...

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2nd International Conference on Augmented Intelligence and Sustainable Systems, ICAISS 2023

作者： Raj, A. Thilakesh Lal, Bechoo Chinthamu, Narender Komuraiah, Akula Kirubakaran, M.K. Sri Venkateswara College of Engineering Department of Information Technology Tamilnadu Chennai India Department of Computer Science and Engineering Andhra Pradesh Vaddeswaram India Cto Candidate DallasTX United States Kamala Institute of Technology and Science Department of Mechanical Engineering Telangana Karimnagar India St. Joseph's Institute of Technology Department of Information Technology Chennai600119 India

ISBN: (纸本)9798350325799

Massive amounts of data are produced by smart cities from a variety of sources, including sensors, social media, and IoT devices. The data analysis can offer insightful information for raising the quality of life and improving urban services. However, data fusion and analysis are made more difficult by the large-scale nature of smart city data. An improved method for big data analytics for smart cities is presented in this abstract, with a particular emphasis on the fusion and analysis of multimodal data. Integrating heterogeneous data from several sources, such as text, photos, videos, and sensor measurements, is known as multimodal data fusion. A more complete understanding of the city can be attained by merging these many data modalities. To establish a single representation for analysis, the fusion process uses feature extraction, data preprocessing, and integration techniques. There are several opportunities created by the analysis of multimodal data in smart cities. It makes it possible to find intricate patterns like social behavior, environmental pollution, and traffic congestion. Predictive models that foretell future occurrences and optimize resource allocation can be constructed by utilizing cutting-edge machine learning and deep learning techniques. Additionally, data analytics may support decision-making by giving city officials and urban planners up-to-the-minute information and practical advice. To create strong data analytics frameworks and integrate them into the architecture of smart cities, interdisciplinary collaboration between data scientists, urban designers, subject matter experts, and policymakers is necessary. In conclusion, large-scale data analytics for smart cities that combine and analyze multimodal data have significant promise for enhancing urban services and building sustainable, livable communities. © 2023 IEEE.

关键词： Smart city

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Effect of silver/zinc co-dopant on enhancing cytotoxicity and antibacterial property of spray pyrolyzed bioactive glasses

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Journal of Asian Ceramic Societies 2024年第1期12卷 104-116页

作者： Ningsih, Henni Setia Vietanti, Frizka Wong, Chin-Chean Chou, Yu-Jen Department of Mechanical Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Orthopedics Taipei Medical University Shuang Ho Hospital New Taipei Taiwan Department of Orthopedics School of Medicine College of Medicine Taipei Medical University Taipei Taiwan Research Center of Biomedical Devices Taipei Medical University Taipei Taiwan International PhD Program for Cell Therapy and Regenerative Medicine College of Medicine Taipei Medical University Taipei Taiwan

Owing to the advancement of bioactive materials, bioactive glasses (BGs) are progressively being recognized as promising choices in fields of bone and tissue engineering with their superior properties such as bioactivity and biocompatibility. However, their applications are limited by the fact that the material itself does not possess antibacterial properties. To address this limitation, antibacterial BGs with silver-zinc co-dopant were proposed and successfully synthesized via the one-step spray pyrolysis technique in this work. The phase composition, chemical composition, surface morphology, and nanoscale structures of the obtained BG specimens were characterized using X-ray diffraction, energy dispersive spectroscopy, scanning electron microscopy, and transmission electron microscopy. Moreover, in-vitro bioactivity was assessed through immersion of the SBF solution, while the in-vitro antibacterial property was examined using Escherichia coli bacteria. Meanwhile, the viability of MC3T3-E1 osteoblast cells was evaluated using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assay. Finally, the results showed positive effects of zinc addition, and the influence of silver and zinc dopants on the in-vitro bioactivity, antibacterial property, and cell viability were discussed. © 2024 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of The Korean Ceramic Society and The Ceramic Society of Japan.

关键词： Spray pyrolysis

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Preparation of Graphene Aerogel for Application in Solar Energy Harvesting

Preparation of Graphene Aerogel for Application in Solar Ene...

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2022 Advances in Science and engineering Technology International Conferences, ASET 2022

作者： Alhammadi, Alya Alnaqbi, Amna Almarashda, Meera Alasad, Shamma Alashkar, Adnan Inayat, Abrar Abdelkareem, Mohammad Alami, Abdul Hai University of Sharjah Sustainable and Renewable Energy Engineering Department Sharjah United Arab Emirates American University of Sharjah Mechanical Engineering Department Sharjah United Arab Emirates American University of Sharjah Materials Science and Engineering PhD Program Sharjah United Arab Emirates

ISBN: (纸本)9781665418010

In this paper, Graphene Aerogel (GA) is prepared and investigated for its potential employment for solar energy harvesting applications. GA can be applied in solar cells applications as an absorption material and as a catalyst for fuel cells. GA is characterized by its extraordinary electrical conductivity and mechanical strength, in addition to a large surface and a low density. The electrical, mechanical, thermal, and absorption characteristics of GA can be tuned depending on the manufacturing process. Hence, GA is utilized in a multitude of applications such as: supercapacitors, air purification, oil and dye absorption from water, and water waste treatment. GA is also an excellent candidate for superior electrodes. In addition, GA are environmentally friendly materials since they are 100% recyclable and do not produce any ozone-depleting compounds. In this paper, GA is synthesized, characterized, and assessed for solar energy harvesting applications with the aid of absorption and Cyclic voltammetry (CV) tests. Results show that GA has immense potential in solar application due to its low band gap and outstanding optical and electrochemical properties. © 2022 IEEE.

关键词： Cyclic voltammetry

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