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  • Micron-scale crack propagation in laser-irradiated enamel ...

    2019-4-29 · Materials and methods Coronal sections of sound enamel and dentine were machined to 50-μm thickness using a FEI-Helios Plasma (FIB). The specimen was irradiated for 30 s with 2.94-μm Er:YAG laser radiation in a moist environment, using a sapphire dental probe tip, with the tip positioned 2 mm away from the sample surface.

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  • Elastic modulus and stress–strain response of human

    Dental enamel is the outermost layer of a tooth crown consisting of a hierarchical and graded structure. Approx. 85 vol.% of enamel consist of the hydroxyapatite mineral, the rest being protein and water. This contribution is concerned with the modeling and computation of the mechanical behavior, in particular with the failure, of the enamel of a bovine tooth.

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  • Dental Enamel Formation and Implications for Oral Health ...

    2017-7-1 · The inner and outer enamel epithelium converge at a region called the cervical loop, which is a niche for dental epithelial stem cells (47, 204, 272, 336, 379, 380, 420) and thus provides a constant source of enamel-forming cells until the enamel crown is fully formed with one exception. In rodent incisors, the long teeth in the upper and lower ...

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  • Mechanical behaviour of human enamel and the relationship ...

    With the above methods, sound enamel samples were investigated and compared with various dental materials, including dental ceramics and dental alloys. • Firstly, using a Berkovich indenter and three spherical indenters with 5, 10 and 20 µm nominal radius, the elastic modulus, hardness and stress-strain relationship of different samples were ...

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  • Nanorobotics in dentistry – A review - ScienceDirect

    2014-8-1 · Nanotechnology is an extremely diverse and multidisciplinary field, ranging from novel extensions of conventional physics to completely new approaches based upon molecular self-assembly, to developing new materials and machines with nanoscale dimensions. 2 The growing interest in the future of dental applications of nanotechnology lead to the emergence of nanodentistry which involves the maintenance of oral health by the use of nanomaterials, biotechnology and dental …

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  • EFFECT OF ETCHING TIME AND ACID CONCENTRATION ON ...

    2016-4-9 · enamel and dentine. With a turbine fissure diamond bur (ISO 806204108524835010) and the water-air cooling the enamel and dentin parallel to the long axis of the tooth, at the depth of the round bur marking, are removed. Diamond burs were changed after every three teeth. The surface after drilling was polished with an abrasive disk (ISO 625900372523) each

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  • Hydraulic turbine contra-angle handpiece Ys

    2014-10-20 · 32b • THE JOURNAL OF THE AMERICAN DENTAL ASSOCIATION The comparative size of the turbine and of the head of a gear-type contra­ angle handpiece (S. S. White) is shown in Figure 4. The turbine has six notched blades fixed to the shaft and measures 7.5 mm. in diameter and 4.8 mm. in height. In

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  • Surgical lasers and hard dental tissue | British Dental ...

    2007-4-28 · Clinically, this is seen as ejection of micro-fragments of tooth tissue within the laser plume and the change in pressure in the immediately surrounding air results in an audible 'popping' sound …

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  • Demineralization - an overview | ScienceDirect Topics

    with enamel demineralization summarized as a net loss of enamel mineral due to the action of either intrinsic or extrinsic acids, leading to dental caries or erosion. Dental caries is primarily caused by lactic and acetic acids which diffuse through the plaque and into the enamel pores between the rods as neutral ion species, where they dissociate and decrease the pH of the fluid surrounding the enamel …

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  • Surface Engineering of Dental Tools with Diamond for ...

    2012-1-1 · 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 . The dental bur , , has three parts: the head, the neck, and the shank. The head contains the blades, which produce cutting action by rotary motion.

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  • Nano-indentation characterisation of natural carious white ...

    The aim of this paper was to characterise the mechanical properties (MPs) and microstructural features of natural enamel white spot lesions (WSLs) using nano-indentation. Five natural WSLs from 4 extracted sound premolar teeth were cross-sectioned.

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  • NLX nano|NSK-Nakanishi International

    2021-5-28 · NLX nano covers a wide speed range and is compatible with your existing optic and non-optic contra-angles. Combined with a wide range of contra-angles, it covers a speed range of 100 - 200,000 min-1, to make it suitable for any applications. Thanks to NSK know how, NLX nano has been designed to reduce weight by 20% and size by more than 25% ...

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  • Handpiece-Turbines.com: NSK Premium Autochuck

    NSK N-65M Canister Autochuck Turbine for NSK N-65M Surgical Dental Handpiece. Our replacement turbines are the perfect fit for your handpiece. For over 20 years, we have served the dental community... MSRP: 189.95.

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  • 1987. Prognostic diagnosis of the health status of an air ...

    air-turbine dental handpiece rotor by using sound and vibration signals Huang Yi-Cheng1, Liu Chang-Chih2, Chuo Po-Chou3 Department of Mechatronics Engineering, National Changhua University of Education, Changhua, Taiwan 1Corresponding author E-mail: [email protected], [email protected], [email protected]

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  • Dental Enamel Formation and Implications for Oral Health ...

    2017-7-1 · The inner and outer enamel epithelium converge at a region called the cervical loop, which is a niche for dental epithelial stem cells (47, 204, 272, 336, 379, 380, 420) and thus provides a constant source of enamel-forming cells until the enamel crown is fully formed with one exception. In rodent incisors, the long teeth in the upper and lower ...

    Get Price
  • EFFECT OF ETCHING TIME AND ACID CONCENTRATION ON ...

    2016-4-9 · Preparation the tooth surface. With a turbine round bur (ISO 806 314 001 534 012 for primary teeth and ISO 806 314 001 534 014 for permanent teeth) and water-air cooling a cut in medio-distal direction along the vestibular surface is made. The purpose was pre-marking the depth of removal of enamel and dentine. With a turbine fissure diamond bur ...

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  • Demineralization - an overview | ScienceDirect Topics

    In addition, no demineralization occurred in sound enamel specimens exposed intraorally over 28 days, while using the 10% nano-HA toothpaste. From these in situ data, the authors concluded that a nano-HA containing dentifrice can be an effective alternative to fluoride toothpastes [51].

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  • A novel self-assembled oligopeptide amphiphile for ...

    2014-4-27 · Researchers are looking for biomimetic mineralization of ena/mel to manage dental erosion. This study evaluated biomimetic mineralization of demineralized enamel induced by a synthetic and self-assembled oligopeptide amphiphile (OPA). The results showed that the OPA self-assembled into nano-fibres in the presence of calcium ions and in neutral acidity.

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  • Surgical lasers and hard dental tissue | British Dental ...

    2007-4-28 · The quest for an alternative treatment modality to the conventional dental turbine has been, essentially, patient-driven and has led to the development of various mechanical and chemical devices ...

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  • Hydraulic turbine contra-angle handpiece Ys

    2014-10-20 · driving a dental engine by the use of water as a propellent. Each of the engines was designed for the straight dental hand­ piece, and each required that a gear-type contra-angle handpiece be attached. The handpiece is driven by a small turbine in the head of the contra-angle. The over-all size and shape of the new

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  • [Analysing noise levels in dental environment. Air turbine ...

    Dental Air Turbine sound depends on the mechanical performance such as rotation and it is impossible to neglect connections of the sound with fluid mechanics and acoustics. Turbine sound must be considered from the standpoint of the sound pressure level and frequency component. In this study, the sound samples was measured and analysed in ...

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  • Mechanical behaviour of human enamel and the relationship ...

    With the above methods, sound enamel samples were investigated and compared with various dental materials, including dental ceramics and dental alloys. • Firstly, using a Berkovich indenter and three spherical indenters with 5, 10 and 20 µm nominal radius, the elastic modulus, hardness and stress-strain relationship of different samples were ...

    Get Price
  • Electrochemical Properties of Human Dental Enamel | Nature

    DESPITE numerous findings that intact enamel is permeable in certain circumstances to various dyes, radioactive tracers and other chemically identifiable substances1, the ionic-sieve behaviour of …

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  • The nano-hardness and elastic modulus of sound deciduous

    The purpose of this study was to compare the nano-hardness and elastic modulus among deciduous and permanent dentin, buccal and lingual sides, incisal, center and cervical areas, and outer, middle and inner layers. Three premolars and three deciduous canines were bucco lingually (BL) sectioned, and three deciduous canines were mesio-distally (MD) sectioned parallel to the …

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  • The Nano is an original Tecma design | Thetford Marine

    In addition, no demineralization occurred in sound enamel specimens exposed intraorally over 28 days, while using the 10% nano-HA toothpaste. From these in situ data, the authors concluded that a nano-HA containing dentifrice can be an effective alternative to fluoride toothpastes [51].

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  • Demineralization - an overview | ScienceDirect Topics

    COXO is a professional dental products manufacturer in China. News. Dental South China2021 review. During the Dental South China2021 Exhibition, COXO carried out a famous teacher lecture activity, invited three teachers to give lectures, and the scene was very lively!

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  • COXO MEDICAL INSTRUMENT CO., LTD. - COXO DENTAL

    2013-2-8 · Air-abrasion is a 68-year-old dental operative technique used for the removal of enamel and dentine during cavity preparation. 27,28 Air abrasion …

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  • Trials Begin For Lozenge That Rebuilds Tooth Enamel |

    2011-5-26 · A phantom tooth has a nanoindentation determined E and H of 9.62 ± 1.79 and 0.63 ± 0.07 GPa, respectively, while polymer infiltrated ceramic has E and H of 30.14 ± 2.96 and 2.36 ± 0.57 GPa, respectively, which are approximately three times higher. However, the fracture toughness value of the phantom tooth material, which is 1.9 ± 0.07 MPa m 1/2, is slightly higher …

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  • Is Tooth Drilling Necessary In Dental Treatment?

    A dental drill is a mechanical tool that dental professionals use to clean decayed enamel and dentine. Tooth decay or cavities occur when the bacteria in the mouth combine with sugar, which produces acids that breakdown tooth enamel. If you are scheduled for a cavity filling, your dental professional will need to remove the tooth's damaged area ...

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  • Therapeutic Use of Silver Nanoparticles in the Prevention ...

    2020-8-12 · Dental caries is one of the major diseases of the oral cavity affecting humans worldwide. Different alternatives have been used for its control, but its incidence and prevalence are still high. On the other hand, silver has been used for centuries due to its antimicrobial properties. With advances in nanotechnology, the use and research in nanomaterials has …

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  • Ti-Max Z Series|NSK-Nakanishi International

    2021-5-28 · It allows one-touch bur insertion and removal without tools. The bur lock mechanism is designed so that bur retention strength increases when high loads are applied to the bur. A special coating is applied to the pusher section for even lighter and easier push button operation when exchanging burs. The Clean Head System has an anti-suck back ...

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  • Tech It Out: Replicating enamel, the hardest tissue in the ...

    2015-6-23 · Radiotherapy is a frequently used treatment for oral cancer. Extensive research has been conducted to detect the mechanical properties of dental …

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  • Effect of gamma irradiation on the wear behaviour of human ...

    2008-7-27 · The effects of sound generated by an ultrasonic dental scaler and a dental turbine on heart rate, systolic and diastolic blood pressure, and hemodynamic changes in the frontal cortex were measured and compared with those of pure tone stimulation in 17 young volunteers. Near-infrared spectroscopy and the Finapres technique were used to measure hemodynamic and …

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  • Difference in physiological responses to sound stimulation ...

    2020-10-9 · The success rates (58.1%) were lower compared to when all the hypomineralised enamel was removed (81.2%), approaching the success found in sound enamel (87.1%).

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  • Minimally invasive judgement calls: managing compromised ...

    2015-4-24 · Randomised controlled trial, double blind, in a community setting. School children with active caries in primary teeth and no pulpal exposure, …

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  • Interproximal enamel reduction - SlideShare

    New Portable Dental Turbine Unit handpiece Compressor 4H. This com... plete high speed kit also includes low speed handpiece contra angle model, low speed handpiece straight model and low speed dental air motor. Product Features • Compact design • Easy to use: After the product is connected to the air pump and mobile phone, the high-speed mobile phone adjusts the air …

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  • Air Turbines|NSK-Nakanishi International

    2021-5-28 · Pana-Max PLUS. Pana-Max2. DynaLED. Prophy-Mate Neo. Perio-Mate. Midwest 4 hole. Bolden 2 hole. The pico burs are for use with the S-Max pico only. Products may not be available depending on the region and market.

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  • Treatment Options for Hypoplastic ... - AEGIS Dental Network

    2021-5-28 · The operation manuals on this webpage are the most current versions available at this time. All manuals are subject to change without notice. To ensure that you always have the most current manual, please check this website regularly for updates.

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  • YUSENDENT® CX236-4 Dental Air Compressor Motors

    2019-8-5 · enamel, the hardness of these ceramic products is still much higher than enamel; in contrast, despite the higher elastic modulus, dental metallic alloys have very similar hardness as enamel. Furthermore, enamel has similar stress-strain relationships and creep behaviour to that of dental metallic alloys. SEM also showed enamel has an

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  • NSK-Nakanishi International

    2009-9-1 · The SBMP system (Group 5) showed the best results on enamel, because of its good bonding efficacy,23,29–30 sufficient enamel etching ability of 35% phosphoric acid and the presence of polyalkenoic acid copolymers in SBMP-primer that lead to bonding durability in a wet environment.30–31 Moreover, repeated formation of the calcium ...

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  • Mechanical behaviour of human enamel and the relationship ...

    聯絡我們. 地址: 香港柴灣新業街8號八號商業廣場23樓. 電話: (852) 2563 5193. 傳真: (852) 2565 9537. 電郵: [email protected]

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  • Effect of Phosphoric Acid Etching of Enamel Margins on the ...

    2009-1-10 · One of the greatest challenges in life sciences and biomaterials research is adhesion of biomolecules and bacteria to solid surfaces in aqueous solutions. An example concerning everybody is biofilm formation in the oral cavity on dental materials and dental hard substances, respectively. The main characteristics typical for any bioadhesion can be observed excellently in the oral cavity.

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  • IOPscience

    2019-4-25 · An army of micro-robots can wipe out dental plaque. Date: April 25, 2019. Source: University of Pennsylvania. Summary: A swarm of micro-robots, directed by magnets, can break apart and remove ...

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