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Hydrogen peroxide gel

Amal Alharbi, Stefano Ardu, Tissiana Bortolotto, Ivo Krejci
OBJECTIVE: To evaluate the efficacy of in-office bleaching on stain removal from stained resin composite and ceramic computer-assisted design/computer-assisted manufacturing (CAD/CAM) blocks and direct resin composites. METHODS: Forty disk-shaped samples were fabricated from each of nine materials: six CAD/CAM (VITABLOCS Mark II, Paradigm MZ100, Exp Vita Hybrid Ceramic, VITA ENAMIC, Exp Kerr, and LAVA Ultimate) and three direct resin composites (Filtek Supreme, Venus Diamond, and Filtek Silorane)...
November 11, 2017: Journal of Esthetic and Restorative Dentistry
T Mellgren, T Qin, C Öhman-Mägi, Y Zhang, B Wu, W Xia, H Engqvist
Bleaching of vital teeth has become common practice in cosmetic dentistry today. Tooth sensitivity and demineralization of the enamel are, however, common side effects associated with hydrogen and carbamide peroxide bleaching. This study investigated if calcium phosphate microspheres, which have remineralizing properties, could be used as an additive without hindering the diffusion of the bleaching agent and if the spheres could be used as a carrier for carbamide peroxide. A remineralizing agent could increase the safety of bleaching and decrease the severity of its side effects...
November 1, 2017: Journal of Dental Research
Li Li, Yifan Bian, Xiaoxiao Zhang, Yibiao Guan, Ersha Fan, Feng Wu, Renjie Chen
A "grave-to-cradle" process for the recycling of spent mixed-cathode materials (LiCoO2, LiCo1/3Ni1/3Mn1/3O2, and LiMn2O4) has been proposed. The process comprises an acid leaching followed by the resynthesis of a cathode material from the resulting leachate. Spent cathode materials were leached in citric acid (C6H8O7) and hydrogen peroxide (H2O2). Optimal leaching conditions were obtained at a leaching temperature of 90 °C, a H2O2 concentration of 1.5 vol%, a leaching time of 60 min, a pulp density of 20 g L(-1), and a citric acid concentration of 0...
October 27, 2017: Waste Management
Marina Og Galloza, Keren Cf Jordão-Basso, Matheus C Bandeca, Samuel O Costa, Alvaro H Borges, Mateus R Tonetto, Fabio C Tirintan, Kátia C Keine, Milton C Kuga
INTRODUCTION: The aim of this study was to evaluate the effects of bleaching gel using 35% hydrogen peroxide (HP), associated with red carmine pigment (RC), in the 3:1 or 1:1 ratio, on fracture resistance and dentin microhardness of endodontically treated teeth. MATERIALS AND METHODS: A total of 40 lower incisors were endodontically treated and divided into four groups (n = 10), according to the bleaching protocol: G1 (HP3), 35% HP + RC (3:1); G2 (HP1), 35% HP + RC (1:1); G3 (positive), 38% HP; and G4 (negative), unbleached...
November 1, 2017: Journal of Contemporary Dental Practice
Panagiotis N Moschou
Diamine and polyamine catabolism controls plant development, resistance to pathogens and stress responses. Diamine and polyamine oxidases control the catabolism of diamines and polyamines, respectively. Two major routes of di-/polyamine catabolism exist: the terminal and the interconverting. The in vitro activity of each route is assayed by the colorimetric or chemiluminescent determination of hydrogen peroxide produced by oxidation of di-/polyamine substrates. However, these assays fail to estimate activity of individual di-/polyamine oxidase isoenzymes...
2018: Methods in Molecular Biology
Sajjad Ashnagar, Abbas Monzavi, Mehdi Abbasi, Mahdi Aghajani, Nasim Chiniforush
Introduction: Today, bleaching is a routine noninvasive alternative for treatment of discolored teeth. The aim of this study was to determine whether conventional or laser activated bleaching predispose teeth to develop caries or not. Methods: Sixty human molars were mounted on acrylic cylinders and their Knoop microhardness (KHN) as well as DIAGNOdent (DD) values were recorded. They were divided into 4 experimental groups; G1) conventional bleaching with 40% hydrogen peroxide gel, G2) Diode laser assisted bleaching with same gel, G3) Nd:YAG laser assisted bleaching with the same gel, G4) control group...
2017: Journal of Lasers in Medical Sciences
Dmitry A Grishanov, Alexey A Mikhaylov, Alexander G Medvedev, Jenny Gun, Arun Nagasubramanian, Srinivasan Madhavi, Ovadia Lev, Petr V Prikhodchenko
High-charge-capacity sodium-ion battery anodes made of Sb2Te3@reduced graphene oxide are reported for the first time. Uniform nano-coating of graphene oxide is carried out from common sol of peroxotellurate and peroxoantimonate under room temperature processing. Reduction by hydrazine under glycerol reflux yields Sb2Te3@reduced graphene oxide. The electrodes exhibit exceptionally high volumetric charge capacity, above 2300mAhcm(-3) at 100mAg(-1) current density, showing very good rate capabilities and retaining 60% of this capacity even at 2000mAg(-1)...
October 12, 2017: Journal of Colloid and Interface Science
Fanny Trausel, Chandan Maity, Jos M Poolman, D S J Kouwenberg, Frank Versluis, Jan H van Esch, Rienk Eelkema
Cells can react to their environment by changing the activity of enzymes in response to specific chemical signals. Artificial catalysts capable of being activated by chemical signals are rare, but of interest for creating autonomously responsive materials. We present an organocatalyst that is activated by a chemical signal, enabling temporal control over reaction rates and the formation of materials. Using self-immolative chemistry, we design a deactivated aniline organocatalyst that is activated by the chemical signal hydrogen peroxide and catalyses hydrazone formation...
October 12, 2017: Nature Communications
Brigida Silvestri, Giuseppe Vitiello, Giuseppina Luciani, Vincenzo Calcagno, Aniello Costantini, Maria Gallo, Silvia Parisi, Simona Paladino, Mariagrazia Iacomino, Gerardino D'Errico, M Federica Caso, Alessandro Pezzella, Marco d'Ischia
We disclose herein the first example of stable monodispersed hybrid nanoparticles (termed MelaSil-NPs) made up of eumelanin biopolymer intimately integrated into a silica nanoscaffold matrix and endowed with high antioxidant and cytoprotective effects associated with a specific subcellular localization. MelaSil-NPs have been fabricated by an optimized sol-gel methodology involving ammonia-induced oxidative polymerization of a covalent conjugate of the eumelanin building block 5,6-dihydroxyindole-2-carboxylic acid (DHICA) with 3-aminopropyltriethoxysilanes (APTS)...
October 23, 2017: ACS Applied Materials & Interfaces
Kevin P Sullivan, Wade A Neiwert, Huadong Zeng, Anil K Mehta, Qiushi Yin, Daniel A Hillesheim, Skanda Vivek, Panchao Yin, Daniel L Collins-Wildman, Eric R Weeks, Tianbo Liu, Craig L Hill
We report the synthesis and characterization of a new class of organic/inorganic hybrid polymers composed of covalently-bound 1,3,5-benzenetricarboxamide linkers and anionic polyoxovanadate clusters with varying counter-cations. These materials form gels within seconds upon contact with polar aprotic organic liquids and catalyze the degradation of odorants and toxic molecules under mild conditions including aerobic oxidation of thiols, hydrogen peroxide-catalyzed oxidation of sulfides, and hydrolysis of organophosphate chemical warfare agent analogues...
October 6, 2017: Chemical Communications: Chem Comm
Sevil Hakimi, Faranak Farhan, Azizeh Farshbaf-Khalili, Parvin Dehghan, Yousef Javadzadeh, Shamsi Abbasalizadeh, Bagher Khalvati
PURPOSE: Bacterial vaginosis is a change in the normal vaginal bacterial flora that leads to loss of hydrogen peroxide producing lactobacilli and overgrowth of predominantly anaerobic bacteria. The present study was conducted to compare the effects of prebiotic vaginal gel with oral metronidazole tablet and metronidazole tablet alone on treatment and recurrence of bacterial vaginosis. METHODS: The present triple-blind randomized clinical trial was conducted in Sadatmandi Hospital in Robat-Karim town, where 100 patients were randomly divided into intervention (receiving a 5 mg prebiotic vaginal gel applicator plus three 250 mg metronidazole tablets per day for 7 days) and control (receiving a 5 mg placebo vaginal gel applicator and three 250 mg metronidazole tablets per day for 7 days) groups...
October 5, 2017: Archives of Gynecology and Obstetrics
Dae Young Yoo, Su Bin Cho, Hyo Young Jung, Woosuk Kim, Goang-Min Choi, Moo-Ho Won, Dae Won Kim, In Koo Hwang, Soo Young Choi, Seung Myung Moon
In the present study, we searched for possible candidates that can prevent ischemic damage in the rabbit spinal cord. For this study, we used two-dimensional gel electrophoresis followed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, in sham- and ischemia-operated animals. As the level of protein disulfide-isomerase A3 (PDIA3) significantly decreased 3 h after ischemia/reperfusion, we further investigated its possible role against ischemic damage using an in vitro spinal cord cell line and in vivo spinal cord ischemic model...
October 5, 2017: Cell Death & Disease
Megan E Szakasits, Wenxuan Zhang, Michael J Solomon
We find that embedded active colloids increase the ensemble-averaged mean squared displacement of particles in otherwise passively fluctuating fractal cluster gels. The enhancement in dynamics occurs by a mechanism in which the active colloids contribute to the average dynamics both directly through their own active motion and indirectly through their excitation of neighboring passive colloids in the fractal network. Fractal cluster gels are synthesized by addition of magnesium chloride to an initially stable suspension of 1...
August 4, 2017: Physical Review Letters
Taro Kanno, Keisuke Nakamura, Kirika Ishiyama, Yasutomo Yamada, Midori Shirato, Yoshimi Niwano, Chie Kayaba, Koji Ikeda, Airi Takagi, Takuhiro Yamaguchi, Keiichi Sasaki
Treatment of severe periodontitis with non-surgical therapy remains challenging in dentistry. The present study aimed to evaluate the clinical efficacy of hydrogen peroxide (H2O2) photolysis-based antimicrobial chemotherapy adjunctively performed with root debridement (RD) for moderate to severe periodontitis. A randomized controlled trial was conducted that included 53 patients with 142 test teeth. The test teeth were randomly assigned to one of three treatment groups: Group 1, RD + H2O2 photolysis; Group 2, RD followed by administration of a local drug delivery system (minocycline chloride gel); or Group 3, RD alone...
September 25, 2017: Scientific Reports
Christian Hentschker, Carolin Dewald, Andreas Otto, Knut Büttner, Michael Hecker, Dörte Becher
Differential proteomics targeting the protein abundance is commonly used to follow changes in biological systems. Differences in localization and degree of posttranslational modifications of proteins including phosphorylations are of tremendous interest due to the anticipated role in molecular regulatory processes. Because of their particular low abundance in prokaryotes, identification and quantification of protein phosphorylation is traditionally performed by either comparison of spot intensities on two-dimensional gels after differential phosphoprotein staining or gel-free by stable isotope labeling, sequential phosphopeptide enrichment and following LC-MS analysis...
September 25, 2017: Electrophoresis
Aleksandra Dydecka, Sylwia Bloch, Ali Rizvi, Shaili Perez, Bozena Nejman-Falenczyk, Gracja Topka, Tomasz Gasior, Agnieszka Necel, Grzegorz Wegrzyn, Logan W Donaldson, Alicja Wegrzyn
Lambdoid bacteriophages form a group of viruses that shares a common schema of genome organization and lifecycle. Some of them can play crucial roles in creating the pathogenic profiles of Escherichia coli strains. For example, Shiga toxin-producing E. coli (STEC) acquired stx genes, encoding Shiga toxins, via lambdoid prophages (Stx phages). The results obtained so far present the evidence for the relation between the exo-xis region of the phage genome and lambdoid phage development, however molecular mechanisms of activities of the exo-xis genes' products are still unknown...
2017: Frontiers in Microbiology
Iman Al-Saleh, Tahreer Al-Rajudi, Ghofran Al-Qudaihi, Pulicat Manogaran
We previously reported high levels of phthalate esters (PAEs) added as solvents or fixatives in 47 brands of perfumes. Diethyl phthalate was the most abundant compound (0.232-23,649 ppm), and 83.3% of the perfumes had levels >1 ppm, the threshold limit cited by a Greenpeace investigation. All samples had dimethyl phthalate levels higher than its threshold limit of 0.1 ppm, and 88, 38, and 7% of the perfumes had benzyl butyl phthalate, di(2-ethylhexyl) phthalate, and dibutyl phthalate levels, respectively, above their threshold limits...
October 2017: Environmental Science and Pollution Research International
Camila Silva Rodrigues, Lisandra Rossato Mozzaquatro, Bárbara Dala Nora, Letícia Borges Jacques, André Mallmann
Composite resin properties can be affected by contact with gel during bleaching procedures; however, there is no consensus about the effect of this contact on resin susceptibility to color change. This study aimed to evaluate staining susceptibility and surface roughness changes in 2 composite resins (Filtek Z250 XT and Filtek Z350 XT) after application of bleaching peroxides and storage in different media. Forty-two disc-shaped specimens of each composite were made, polished, and divided into 3 groups according to treatment type (35% hydrogen peroxide, 16% carbamide peroxide, or deionized water as a control group)...
September 2017: General Dentistry
T N Barry, C W Bailey, D Ashcraft-Olmscheid, K S Vandewalle
The purpose of this study was to compare the whitening efficacy of a novel bleaching agent containing a unique tribarrel hydremide-peroxide gel (KöR) with a traditional bleaching system of hydrogen peroxide or carbamide peroxide (Opalescence). Bovine incisors were mounted into a custom resin, arch-shaped mounting device. Four groups of 10 teeth were created using mounting devices containing five teeth each. The in-office and home bleaching gels of KöR and Opalescence were applied to the teeth alone and in trays to simulate a combination of in-office and home bleaching or home bleaching only...
September 2017: Operative Dentistry
Haiyang Xu, Jing Li, Shiming Wang, Linxiang Xu, Rui Cheng, Jianfa Zhang
Oligosaccharides from the water-soluble β-glucan, Salecan, were investigated to evaluate the activation effect on the defense responses of Arabidopsis thaliana Col0. Salecan oligosaccharides (ScOs, DP 5-10) were prepared at first by acid hydrolysis and gel filtration chromatography and then employed for foliar spray on Arabidopsis seedlings and plants. After ScOs treatment, increase of hydrogen peroxide was histologically and analytically detected in leaves. Transcription levels of several indicator genes which correspond to the signaling pathways and pathogenesis-related proteins were up-regulated at different time by means of quantitative RT-PCR analysis...
August 17, 2017: World Journal of Microbiology & Biotechnology
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