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  • Optimum Design of the Dental Air-Turbine Handpiece

    2020-1-22 · The number of blades, the blade angle of the impeller and the gap between the impeller and the housing were chosen as the three major design parameters. The design of experiment technique was used to optimize two dental air-turbine handpiece systems: Type 1 was an air turbine alone and Type 2 was the air-turbine with an air supply tube.

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  • Optimum Design of a Saw-Tooth-Shaped Dental Air

    To improve the torque of dental air turbine handpieces, a single nozzle of the tangential inlet was adopted by Makhsuda Juraeva et al., [14] [15] [16] and the outer diameter of the turbine was 5 ...

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  • Designing high-speed dental air-turbine handpiece by

    Designing high-speed dental air-turbine handpiece by using a computational approach October 2017 International Journal of Precision Engineering and Manufacturing 18(10):1403-1407

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  • Dental Drill - an overview | ScienceDirect Topics

    2013-9-30 · Air turbine hand pieces can run up to 500,000 rpm, although they are rarely used at such high speeds. General operating speeds are 20,000–50,000 rpm varying with the diameter of the bur. The burs used at high speeds are mainly diamond coated or made of tungsten carbide.

    Get Price
  • A Numerical Study on Performance of Dental Air

    2017-9-1 · Three impeller samples used in commercial dental turbines (as listed in table 1) have been selected to be modeled and utilized for simulation purposes. In order to achieve an accurate modeling, first of all, the turbine handpieces have been disassembled, and the impellers are 3D scanned using a digitizer apparatus (Renishaw Company, model: Cyclone2).

    Get Price
  • Development of high-speed micro-gas bearings for

    2005-8-15 · The micro-machine gas turbine requires bearings of diameter 4 mm to operate stably at 870 000 rpm. Based on the preliminary analysis, it has been found that a large bearing gap and very high rotor balance are required to achieve low viscous loss at high speed and to prevent the rotor from hitting the bearing at critical speed.

    Get Price
  • Development and testing of a three‐dimensional

    2021-4-1 · The radius (R) of the turbine rotors is 54 m, the turbine hub height (H hub) is 80 m and the rotor swept area is 9,160 m 2 per turbine. The turbine SCADA contains records of meteorological data (e.g., wind speed) and turbine operational parameters [e.g., yaw and rotation rate (RPM)], which are input parameters for the ballistics model.

    Get Price
  • Chemical vapor deposition diamond dental burs for

    However dental burs are different as they rotate at ultra-high speeds beyond 200,000 rpm and thus depositing a diamond film that stays adherent at these speeds is a main challenge. The present work successfully coated microcrystalline (3–7 μm) and nano-crystalline (25–50 nm) sized diamond grains on tungsten carbide surfaces and evaluated their performance at ultra-high speeds on extracted human …

    Get Price
  • Australian Dental Journal - Wiley

    than with the use of air turbine or syringe systems for hard tissue dental treatment and oral surgery, such as tooth extraction, restorative treatment, or endodontic treatment. Dental lasers use a compressed air stream for cool-ing the operative site and supply the air at the rate of 6 to 9 L/min.7 The Er:YAG laser manual suggests that

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  • Mesenchymal stem cells and three‐dimensional ...

    a three-dimensional (3D)-printed osteoconductive HA/TCP scaffold. Specifically, we have compared the performance of dental pulp neural crest MSCs (DPNCCs) to bone marrow aspirate (BMA) combined with a 3D-printed HA/TCP scaffold to regenerate bone in a calvarial CSD (>7.0 cm2). Both DPNCCs and BMA loaded onto the 3D-

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  • Three-dimensional off-design numerical analysis of an ...

    2014-12-15 · This paper will fill that gap by providing a complete ORC analysis including the thermodynamic cycle, the preliminary meanline design and finally pioneering three-dimensional CFD simulations of a 400 kW-R143a radial-inflow turbine in sensible geothermal brine and cycle conditions. Off-design conditions are also presented and discussed.

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  • Optimum Design of the Dental Air-Turbine Handpiece

    2020-1-22 · An air-turbine and associated air supply tube was optimized as a dental air-turbine handpiece system. The system consists of an air-turbine with an impeller and a housing, and an air supply tube which supplies compressed-air to the air-turbine. The flow characteristics of the dental air-turbine handpiece system were investigated using ANSYS CFX.

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  • A testing machine for dental air-turbine handpiece ...

    A portable test machine is described for determining three key characteristics of dental air-turbine handpieces: free-running speed, stall torque and bearing resistance.

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  • Computational analysis of a gas turbine blade with ...

    2021-1-1 · Subsequently, four materials are analysed to select the best-suited material for manufacturing of the gas turbine blade. Three-dimensional CAD model of a gas turbine blade is modelled using SolidWorks 2018 and the finite element analysis (FEA) based static structural, thermal and modal analyses are carried out using ANSYS 2019.

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  • Performance of a Micro-scale Radial-Flow Compressor ...

    2003-10-20 · in air-turbines for dental drills, may also offer an option. For our experiments, ball bearings were employed for test speeds up to 420,000 rpm (260 m/s tip speed), close to the structural limit of the bearings and the speed limit of the cold-flow turbine in the facility. This paper comments on the design and manufacturing of the

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  • Dental Drill - an overview | ScienceDirect Topics

    2013-9-30 · Dental burs have revolutionized the dentistry field and are used for cutting hard tissues such as bone or tooth [1,4,6–9]. They are normally made of stainless steel, diamond grit or particles, and tungsten carbide and fitted to a dental drill incorporating an air turbine. The dental bur was developed <300 years ago [8] and still widely used.

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  • Chemical vapor deposition diamond dental burs for

    However dental burs are different as they rotate at ultra-high speeds beyond 200,000 rpm and thus depositing a diamond film that stays adherent at these speeds is a main challenge. The present work successfully coated microcrystalline (3–7 μm) and nano-crystalline (25–50 nm) sized diamond grains on tungsten carbide surfaces and evaluated ...

    Get Price
  • The evolution of the CEREC system - ScienceDirect

    2006-9-1 · Instantaneous three-dimensional measurement of tooth preparations with an oral camera. To make sure that fast three-dimensional scanning and data acquisition of a dental preparation would be possible, we had to test the optical three-dimensional scanning technique considered by Dr. Brandestini.

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  • Evaluating aerosol and splatter following dental ...

    2020-9-23 · The highest levels of contamination were from the high-speed air-turbine, although the ultrasonic scaler demonstrated contamination at greater distances, in keeping with the findings of Bennett et al. 21 Dental suction was effective at reducing fluorescein contamination, with reduction of 67%-75% between 0.5 and 1.5 m.

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  • ELECTROmatic™ System - KaVo Dental

    2021-6-29 · Made for your hand: Each KaVo dental turbine is the result of extensive ergonomic and anatomical studies with consistent dimensions, angles and contours for balanced handling. You can choose from the wide range of KaVo's top class dental turbines. KaVo dental turbines - The perfect interplay of hand and tool.

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  • Dental Turbine Market Size Worth $172.2 Million By

    2020-12-9 · The global dental turbine market size is expected to reach USD 172.2 million by 2027, expanding at a CAGR of 16.1%, according to a new report by Grand View Research, Inc. Rise in …

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  • Operator's ability at assessing a high-speed (air

    2015-1-23 · Background The 'high-speed' (air turbine) handpiece is used extensively across many dental disciplines and the ability of clinicians to detect faulty handpieces is essential.. Aim The primary aim ...

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  • Three-dimensional Spheroid Culture Enhances

    High speed turbine blower. Airhank high speed turbine blower is a high-speed, ultra-high air volume blower produced by the same three-dimensional flow technology as the aircraft engine. Under the design conditions, the air pressure reaches 50-290 mbar, the air volume is 85-6000 cubic meters per hour, the speed is 18000-21000 rpm, and the air ...

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  • FACULTY OF DENTISTRY

    2021-4-24 · Three-dimensional (3D) culture of mesenchymal stem cells has become an important research and development topic. However, comprehensive analysis of human dental pulp-derived mesenchymal stem cells (DPSCs) in 3D-spheroid culture remains unexplored. Thus, we evaluated the cellular characteristics, multipotent differentiation, gene expression, and related-signal transduction …

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  • Evaluating aerosol and splatter following dental ...

    2020-7-15 · it also has adverse effects on the hearing capacity of the dentists. The sources of noise from dental handpiece during operation are: a) the air nose emitted by the drive air for the air turbine b) the mechanical nosie from the rotation of the air turbine and c) the air …

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  • Dimensional stability of short fibre reinforced flowable ...

    2020-9-23 · The highest levels of contamination were from the high-speed air-turbine, although the ultrasonic scaler demonstrated contamination at greater distances, in keeping with the findings of Bennett et al. 21 Dental suction was effective at reducing fluorescein contamination, with reduction of 67%-75% between 0.5 and 1.5 m.

    Get Price
  • CFD-based design and analysis of air-bearing-supported ...

    2021-2-25 · The flowable dental composite system consisted of 80 wt% UDMA-20 wt% TEGDMA (Esstech, Inc., USA) based resin reinforced with 0.7 µm strontium glass …

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  • Turbine - Turbine selection on the basis of specific

    2021-1-7 · sage. Two turbine exhausts are provided in this design for cooling pur-poses due to their high rotational speed. This paper presents an active investigation and analysis on an existing model of an air-driven paint spray spindle with a maximum rotational speed of 100,000 rpm and bell size of 70 mm, with the ro-tational speed increased to 145,000 ...

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  • Optimum Design of the Dental Air-Turbine Handpiece

    2020-1-22 · The number of blades, the blade angle of the impeller and the gap between the impeller and the housing were chosen as the three major design parameters. The design of experiment technique was used to optimize two dental air-turbine handpiece systems: Type 1 was an air turbine alone and Type 2 was the air-turbine with an air supply tube.

    Get Price
  • Optimum Design of a Saw-Tooth-Shaped Dental Air

    To improve the torque of dental air turbine handpieces, a single nozzle of the tangential inlet was adopted by Makhsuda Juraeva et al., [14] [15] [16] and the outer diameter of the turbine was 5 ...

    Get Price
  • Designing high-speed dental air-turbine handpiece by

    Designing high-speed dental air-turbine handpiece by using a computational approach October 2017 International Journal of Precision Engineering and Manufacturing 18(10):1403-1407

    Get Price
  • Dental Drill - an overview | ScienceDirect Topics

    2013-9-30 · Air turbine hand pieces can run up to 500,000 rpm, although they are rarely used at such high speeds. General operating speeds are 20,000–50,000 rpm varying with the diameter of the bur. The burs used at high speeds are mainly diamond coated or made of tungsten carbide.

    Get Price
  • A Numerical Study on Performance of Dental Air

    2017-9-1 · Three impeller samples used in commercial dental turbines (as listed in table 1) have been selected to be modeled and utilized for simulation purposes. In order to achieve an accurate modeling, first of all, the turbine handpieces have been disassembled, and the impellers are 3D scanned using a digitizer apparatus (Renishaw Company, model: Cyclone2).

    Get Price
  • Development of high-speed micro-gas bearings for

    2005-8-15 · The micro-machine gas turbine requires bearings of diameter 4 mm to operate stably at 870 000 rpm. Based on the preliminary analysis, it has been found that a large bearing gap and very high rotor balance are required to achieve low viscous loss at high speed and to prevent the rotor from hitting the bearing at critical speed.

    Get Price
  • Development and testing of a three‐dimensional

    2021-4-1 · The radius (R) of the turbine rotors is 54 m, the turbine hub height (H hub) is 80 m and the rotor swept area is 9,160 m 2 per turbine. The turbine SCADA contains records of meteorological data (e.g., wind speed) and turbine operational parameters [e.g., yaw and rotation rate (RPM)], which are input parameters for the ballistics model.

    Get Price
  • Chemical vapor deposition diamond dental burs for

    However dental burs are different as they rotate at ultra-high speeds beyond 200,000 rpm and thus depositing a diamond film that stays adherent at these speeds is a main challenge. The present work successfully coated microcrystalline (3–7 μm) and nano-crystalline (25–50 nm) sized diamond grains on tungsten carbide surfaces and evaluated their performance at ultra-high speeds on extracted human …

    Get Price
  • Australian Dental Journal - Wiley

    than with the use of air turbine or syringe systems for hard tissue dental treatment and oral surgery, such as tooth extraction, restorative treatment, or endodontic treatment. Dental lasers use a compressed air stream for cool-ing the operative site and supply the air at the rate of 6 to 9 L/min.7 The Er:YAG laser manual suggests that

    Get Price
  • Mesenchymal stem cells and three‐dimensional ...

    a three-dimensional (3D)-printed osteoconductive HA/TCP scaffold. Specifically, we have compared the performance of dental pulp neural crest MSCs (DPNCCs) to bone marrow aspirate (BMA) combined with a 3D-printed HA/TCP scaffold to regenerate bone in a calvarial CSD (>7.0 cm2). Both DPNCCs and BMA loaded onto the 3D-

    Get Price
  • Guidelines for Infection Control in Dental Health-Care ...

    Dental programs in institutional settings, (e.g., hospitals, health centers, and educational institutions) can coordinate with departments that provide personnel health services. However, the majority of dental practices are in ambulatory, private settings that do not have licensed medical staff and facilities to provide complete on-site health ...

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  • Provider of Reliable Energy Across Asia

    configurations. Using the latest technology for three-dimensional flow analysis, optimised turbine designs ensure the most efficient conversion of thermal energy to power. Automated Shaft Sealing Technology Floating labyrinth seals assembled on the diaphragms can be easily replaced to maintain effective shaft sealing and sealing between stages ...

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  • Drilling for a Century | Proto Magazine

    2008-9-22 · Three years later, George F. Green introduced electricity to the device. Green’s electromagnetic-motor-powered drill was effective, but it was heavy and too expensive for most practices. Forty-five years after the introduction of the plug-in drill, the modern air-turbine-engine dental drill was developed in 1953, increasing rpms to 50,000.

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  • Arabelle Nuclear Steam Turbine | GE Steam Power

    2021-7-2 · GE’s Arabelle turbine is the most powerful nuclear steam turbine in operation. Suiting all reactors type, from 700MW up to 1,900MW, the Arabelle is highly efficient, reliable, and cost effective. 99.96%. reliability over 400,000 operating hours. 1,900 MW.

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  • Regenair - gastmfg.com

    2020-5-18 · 3500 RPM should be at least one pipe size larger than the blower ports. ... • Line voltage @ 60 Hz 230V or 460V for three-phase units. 115V or 230V for single-phase units. ... • Medical and dental sterilizing equipment • Dental hand tools, air mattress Industrial tools and machinery

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  • Co-culture of Human Dental Pulp Stem Cells and

    2016-4-27 · This letter introduces a non-intrusive calibration scheme for three-dimensional (3D) optical flow velocimetry techniques. For these 3D techniques, including tomographic PIV and 3D-PTV, calibration targets need to be imaged within the measurement volume at different depth positions. However, for domains with limited access and with small dimensions, it is difficult or impossible to place a ...

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  • Non-intrusive calibration for three-dimensional

    0. XSite is a powerful three-dimensional hydraulic fracturing numerical simulation program based on the Synthetic Rock Mass (SRM) and Lattice methods. XSite is capable of modeling multiple wellbores with multiple stages and clusters, including open-hole completions and perforation tunnels. XSite resolves general hydraulic fracture interaction ...

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  • XSite - 3.0 - Geotechnical Software - Three

    2021-6-28 · 3.1 Use of H-25 Gas Turbine. The GT used for the project was an H-25 Series model (Type 32C) made by Mitsubishi Hitachi Power Systems, Ltd. (MHPS). It is a heavy-duty simple-cycle GT with a rated output of 33 MW and rated speeds of 7,250/1,800 rpm.

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  • Upgrade Project for H-25 Gas Turbine Generator at ...

    2018-4-24 · Objectives The aim of this study was to determine the increase in heat production, preparation time, and cutting surface quality of conventional, high-speed rotating instruments and piezoelectric preparation for coronectomy procedures. Materials and methods One hundred intact extracted molars were sectioned horizontally, sub-totally, 1 mm under the cemento-enamel line with …

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