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Power whitening

Reza Fekrazad, Shervin Alimazandarani, Katayoun Am Kalhori, Hadi Assadian, Seyed-Mahdi Mirmohammadi
BACKGROUND: Laser-assisted bleaching uses laser beam to accelerate release of free radicals within the bleaching gel to decrease time of whitening procedure. The aim of this study was to compare the efficacy of power bleaching using Opalescence Xtra Boost® and laser bleaching technique using LaserSmile gel and diode laser as an activator in their tooth whitening capacity. MATERIAL AND METHODS: Student t test showed that the laser bleaching group significantly outperformed the power bleaching group in changing ∆E (p=0...
April 2017: Journal of Clinical and Experimental Dentistry
J Zhang, J-Y Feng, Y-L Ni, Y-J Wen, Y Niu, C L Tamba, C Yue, Q Song, Y-M Zhang
Multilocus genome-wide association studies (GWAS) have become the state-of-the-art procedure to identify quantitative trait nucleotides (QTNs) associated with complex traits. However, implementation of multilocus model in GWAS is still difficult. In this study, we integrated least angle regression with empirical Bayes to perform multilocus GWAS under polygenic background control. We used an algorithm of model transformation that whitened the covariance matrix of the polygenic matrix K and environmental noise...
June 2017: Heredity
Mozhgan Bizhang, Ilka Schmidt, Yong-Hee Patricia Chun, Wolfgang H Arnold, Stefan Zimmer
OBJECTIVE: The aim of this study was to evaluate the susceptibility of dentin to brushing abrasion using four different toothbrushes (rotating-oscillating, sonic and two types of manual toothbrushes) with the same brushing forces. METHODS: Dentin samples (n = 72) were selected from 72 impacted third molars. Half of the surface of dentin samples was covered with an adhesive tape, creating a protected and a freely exposed area in the same specimen. Brushing was performed with either a: sonic (Sonicare PowerUp, Philips GmbH, Hamburg, Germany), b: oscillating-rotating (Oral B Vitality Precisions Clean, Procter & Gamble, Schwalbach am Taunus, Germany) or two different manual toothbrushes c: flat trim brush head toothbrush (Dr...
2017: PloS One
Chris S Ivanoff, Jie Jayne Wu, Hadi Mirzajani, Cheng Cheng, Quan Yuan, Stepan Kevorkyan, Radostina Gaydarova, Desislava Tomlekova
AC electrokinetics (ACEK) has been shown to deliver certain drugs into human teeth more effectively than diffusion. However, using electrical wires to power intraoral ACEK devices poses risks to patients. The study demonstrates a novel interdigitated electrode arrays (IDE) assembly powered by inductive coupling to induce ACEK effects at appropriate frequencies to motivate drugs wirelessly. A signal generator produces the modulating signal, which multiplies with the carrier signal to produce the amplitude modulated (AM) signal...
October 2016: Biomedical Microdevices
Nam Young Kim, Hee Souk Kwon, Hyeon Yong Lee
BACKGROUND: This work presents the first report that A. rugosa could have tyrosinase and melanogenesis inhibition and that its activities also be improved by fermentation with Lactobacillus rhamnosus and Lactobacillus paracasei. It was found that the tyrosinase and melanogenesis inhibition was correlated with antioxidant activity of acacetin, the major biologically active substances in A. rugosa. AIMS: we pursued an improvement in tyrosinase and melanogenesis inhibition of A...
August 16, 2016: Journal of Cosmetic Dermatology
Andrew Whiten, Gillian Allan, Siobahn Devlin, Natalie Kseib, Nicola Raw, Nicola McGuigan
The current study avoided the typical laboratory context to determine instead whether over-imitation-the disposition to copy even visibly, causally unnecessary actions-occurs in a real-world context in which participants are unaware of being in an experiment. We disguised a puzzle-box task as an interactive item available to the public within a science engagement zone of Edinburgh Zoo. As a member of the public approached, a confederate acting as a zoo visitor retrieved a reward from the box using a sequence of actions containing both causally relevant and irrelevant elements...
2016: PloS One
Meredith K Kupinski, Eric Clarkson
We present a new method for computing optimized channels for estimation tasks that is feasible for high-dimensional image data. Maximum-likelihood (ML) parameter estimates are challenging to compute from high-dimensional likelihoods. The dimensionality reduction from M measurements to L channels is a critical advantage of channelized quadratic estimators (CQEs), since estimating likelihood moments from channelized data requires smaller sample sizes and inverting a smaller covariance matrix is easier. The channelized likelihood is then used to form ML estimates of the parameter(s)...
June 1, 2016: Journal of the Optical Society of America. A, Optics, Image Science, and Vision
R Lo Giudice, G Pantaleo, A Lizio, U Romeo, G Castiello, G Spagnuolo, G Lo Giudice
BACKGROUND: Auxiliary power sources (LED and laser) are used in in-office teeth bleaching techniques to accelerate the redox reaction of the whitening gel to increase ease of use, to improve comfort and safety, and to decrease the procedure time. OBJECTIVE: The aim this study is to evaluate the efficiency of the teeth whitening procedures performed with hydrogen peroxide and carbamide peroxide, LED or Laser activated. METHOD: 18 patients, affected by exogenous dyschromia, were treated with a bleaching agent composed by 35% hydrogen peroxide and 10% carbamide peroxide...
2016: Open Dentistry Journal
Chengjie G Huang, Zhubo D Zhang, Maurice J Chacron
It is commonly assumed that neural systems efficiently process natural sensory input. However, the mechanisms by which such efficient processing is achieved, and the consequences for perception and behaviour remain poorly understood. Here we show that small conductance calcium-activated potassium (SK) channels enable efficient neural processing and perception of natural stimuli. Specifically, these channels allow for the high-pass filtering of sensory input, thereby removing temporal correlations or, equivalently, whitening frequency response power...
April 18, 2016: Nature Communications
Tamara S Al-Karadaghi, Asmaa A Al-Saedi, Mohammed A Al-Maliky, Ali S Mahmood
This in vitro study aimed to investigate the whitening efficacy of 940 nm and 980 nm diode laser photoactivation in tooth bleaching by analysing pulp chamber temperature, as well as the change in tooth colour. Root canals of thirty extracted human lower premolars were prepared. Laserwhite* 20 bleaching agent containing 38% of hydrogen peroxide was photoactivated with 7 W output power of 940 nm and 980 nm diode lasers for 120 s. Bleaching gel reduced 27-29% of the temperature from reaching the pulp chamber...
December 2016: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
Carmen Vanessa Ortiz-Ruiz, Jose Berna, Jose Tudela, Ramon Varon, Francisco Garcia-Canovas
BACKGROUND: Tyrosinase is an enzyme involved in the first steps of the melanogenesis process. It catalyzes the hydroxylation of monophenols to o-diphenols and the oxidation of the latter to o-quinones. Ellagic acid (EA) is a phenolic compound which has been described as a tyrosinase inhibitor and is used in the cosmetic industry as a whitening agent. However, it has hydroxyl groups in ortho position and could act as a substrate rather than inhibitor. This aspect should be taken into consideration when using this compound as a cosmetic ingredient due to the reactive character of o-quinones...
May 2016: Journal of Dermatological Science
Nazish Fatima, Syed Yawar Ali Abidi, Ashraf Ali Meo
OBJECTIVE: To evaluate the effect of home-use bleaching agent containing 16% Carbamide Peroxide (CP) and in-office bleaching agent containing 38% Hydrogen Peroxide (HP) on enamel micro-hardness. STUDY DESIGN: An in vitroexperimental study. PLACE AND DURATION OF STUDY: Department of Operative Dentistry and Science of Dental Materials at Dr. Ishrat-ul-Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences and Material Engineering Department of NED University of Engineering and Technology, Karachi, from July to December 2014...
February 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Jussara Karina Bernardon, Marceli Vieira Martins, Gabrielle Branco Rauber, Sylvio Monteiro Junior, Luiz Narciso Baratieri
STATEMENT OF PROBLEM: The influence of different compositions of desensitizing agents in whitening gels should be evaluated. PURPOSE: The purpose of this clinical trial was to compare the effectiveness of 4 carbamide peroxide (CP)-based bleaching gels containing desensitizing agents regarding the degree of bleaching, tooth sensitivity, degree of participant satisfaction, and gingival irritation. MATERIAL AND METHODS: The maxillary arch of the 50 participants was bleached using a split mouth, home-bleaching technique...
June 2016: Journal of Prosthetic Dentistry
Nazish Fatima
OBJECTIVE: To evaluate the effect of home-use bleaching agent containing 16% Carbamide Peroxide (CP) and in-office bleaching agent with 38% Hydrogen Peroxide (HP) on surface micro-morphology of enamel. STUDY DESIGN: An experimental study. PLACE AND DURATION OF STUDY: The discs were prepared at Material Engineering Department of NED University of Engineering and Technology, Karachi, and surface morphology was analyzed at Centralized Science Laboratory of Karachi University, Pakistan...
January 2016: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
Kendra S Burbank
The autoencoder algorithm is a simple but powerful unsupervised method for training neural networks. Autoencoder networks can learn sparse distributed codes similar to those seen in cortical sensory areas such as visual area V1, but they can also be stacked to learn increasingly abstract representations. Several computational neuroscience models of sensory areas, including Olshausen & Field's Sparse Coding algorithm, can be seen as autoencoder variants, and autoencoders have seen extensive use in the machine learning community...
December 2015: PLoS Computational Biology
D Strakas, K Tolidis, E Koliniotou-Koumpia, L Vanweersch, R Franzen, N Gutknecht
The purpose of this pilot in vitro study was to evaluate the temperature increase in the pulp chamber of the teeth, during Er,Cr:YSGG bleaching, as well as to show which teeth are the most susceptible in terms of pulp temperature increase during laser-activated bleaching treatment. Although Er:YAG studies have been published on this subject, it is the first time Er,Cr:YSGG wavelength is tested. Fifteen teeth were tested--3 each of the following--(maxillary central incisors, lateral incisors, canines, premolars and mandibular incisors)...
January 2016: Lasers in Medical Science
Bart L van de Bank, Stephan Orzada, Frits Smits, Miriam W Lagemaat, Christopher T Rodgers, Andreas K Bitz, Tom W J Scheenen
The design and construction of a dedicated RF coil setup for human brain imaging ((1)H) and spectroscopy ((31)P) at ultra-high magnetic field strength (7 T) is presented. The setup is optimized for signal handling at the resonance frequencies for (1)H (297.2 MHz) and (31)P (120.3 MHz). It consists of an eight-channel (1)H transmit-receive head coil with multi-transmit capabilities, and an insertable, actively detunable (31)P birdcage (transmit-receive and transmit only), which can be combined with a seven-channel receive-only (31)P array...
November 2015: NMR in Biomedicine
Andrew Whiten
The complexity of Stone Age tool-making is assumed to have relied upon cultural transmission, but direct evidence is lacking. This paper reviews evidence bearing on this question provided through five related empirical perspectives. Controlled experimental studies offer special power in identifying and dissecting social learning into its diverse component forms, such as imitation and emulation. The first approach focuses on experimental studies that have discriminated social learning processes in nut-cracking by chimpanzees...
November 19, 2015: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
Carmen Vanessa Ortiz-Ruiz, Manuel Ballesta de Los Santos, Jose Berna, Jose Fenoll, Pedro Antonio Garcia-Ruiz, Jose Tudela, Francisco Garcia-Canovas
Oxyresveratrol is a stilbenoid described as a powerful inhibitor of tyrosinase and proposed as skin-whitening and anti-browning agent. However, the enzyme is capable of acting on it, considering it as a substrate, as it has been proved in the case of its analogous resveratrol. Tyrosinase hydroxylates the oxyresveratrol to an o-diphenol and oxidizes the latter to an o-quinone, which finally isomerizes to p-quinone. For these reactions to take place the presence of the Eox (oxy-tyrosinase) form is necessary. The kinetic analysis of the proposed mechanism has allowed the kinetic characterization of this molecule as a substrate of tyrosinase, affording a catalytic constant of 5...
November 2015: IUBMB Life
Ai-Ho Liao, Hsin-Chiao Ho, Yi-Chun Lin, Hang-Kang Chen, Chih-Hung Wang
The transdermal delivery of a wide range of high-molecular-weight drugs is limited by the stratum corneum layer of the epidermis representing a significant barrier to penetration across the skin. This study first determined the different effects of different-size ultrasound (US) contrast agents and microbubbles (MBs) for enhancing the transdermal delivery of high-molecular-weight drugs. The effects of US-mediated different-size (1.4, 2.1, and 3.5 μm) MBs (as a contrast agent) and ascorbyl tetraisopalmitate (VC-IP) on enhancing skin transdermal delivery were demonstrated both in vitro and in vivo...
2015: PloS One
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