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Hydrogen peroxide gel

Justine J Roberts, Pratibha Naudiyal, Khoon S Lim, Laura A Poole-Warren, Penny J Martens
BACKGROUND: Dityrosine crosslinking in proteins is a bioinspired method of forming hydrogels. This study compares oxidative enzyme initiators for their relative crosslinking efficiency and cytocompatibility using the same phenol group and the same material platform. Four common enzyme and enzyme-like oxidative initiators were probed for resulting material properties and cell viability post-encapsulation. RESULTS: All four initiators can be used to form phenol-crosslinked hydrogels, however gelation rates are dependent on enzyme type, concentration, and the oxidant...
2016: Biomaterials Research
Juliana do Carmo Públio, Maria Beatriz Freitas D'Arce, Anderson Catelan, Gláucia Maria Bovi Ambrosano, Flávio Henrique Baggio Aguiar, José Roberto Lovadino, Débora Alves Nunes Leite Lima
This study evaluated the influence of different enamel thicknesses and bleaching agents on treatment efficacy in-depth by spectrophotometry color analysis. Eighty bovine dental fragments were previously stained in black tea solution and randomly assigned into eight groups (n=10), 1.75mm dentin thickness and different enamel thicknesses as follows: 0.5mm, 1.0mm planned, 1.0mm unplanned (aprismatic enamel), and absence of enamel. The 10% carbamide peroxide (CP) and 35% hydrogen peroxide (HP) bleaching gels were applied on the enamel surface following the manufacturer's recommendations...
2016: Open Dentistry Journal
Manuella Sca Santana, Enrico C Bridi, Ricardo S Navarro, Carlos J de Lima, Adriana B Fernandes, Flávia Lb do Amaral, Fabiana Mg França, Cecilia P Turssi, Roberta T Basting
The aim of this in vitro study was to evaluate the effects of dental bleaching with ozone (O3) on color change and enamel microhardness. Enamel blocks (3 x 3 x 3mm) were randomly distributed for treatments (n=10). Color change (ΔE) and Knoop microhardness of the enamel blocks were evaluated before and after the following treatments: C - deionized water (control); HP - 37.5% hydrogen peroxide (Pola Office+/ SDI); PLA - placebo gel; O3 - ozone; and O2 - oxygen. Four 8-minute applications were used for HP and PLA, and one 19-minute application for O3 and O2...
April 2016: Acta Odontológica Latinoamericana: AOL
M Rezende, J L De Geus, A D Loguercio, A Reis, D Kossatz
OBJECTIVE: The aim of this study was to evaluate the genotoxicity of in-office bleaching with 35% hydrogen peroxide in epithelial cells from the gingival and lip tissues. METHODS AND MATERIALS: Thirty volunteers with central incisors shade A1 or darker were selected for this study. The gingival tissue of the teeth to be bleached was isolated with a light-polymerized resin dam, and the 35% hydrogen peroxide gel was administered during three 15-minute applications over the course of the 45-minute application period...
September 20, 2016: Operative Dentistry
Ana Bárbara Araújo Loiola, Aline Evangelista Souza-Gabriel, Renata Siqueira Scatolin, Silmara Aparecida Milori Corona
BACKGROUND: Hydrogen peroxide (HP) at lower concentration can provide less alteration on enamel surface and when combined with laser therapy, could decrease tooth sensitivity. This in situ study evaluated the influence of 15% and 35% HP gel activated by lighting-emitting diode (LED)/laser light for in-office tooth bleaching. MATERIALS AND METHODS: Forty-four bovine enamel slabs were polished and subjected to surface microhardness (load of 25 g for 5 s). The specimens were placed in intraoral palatal devices of 11 volunteers (n = 11)...
July 2016: Contemporary Clinical Dentistry
E Fernández, C Bersezio, J Bottner, F Avalos, I Godoy, D Inda, P Vildósola, Jrc Saad, O B Oliveira, J Martín
OBJECTIVE: The aim was to evaluate the color longevity after nine months of in-office bleaching with gel (6% hydrogen peroxide), to compare this to a control concentration of 35% in a split-mouth study model, and to assess the dental confidence and psychosocial impact on patients. METHODS AND MATERIALS: Twenty-seven patients were assessed at the nine-month recall. The bleaching procedure with 6% or 35% hydrogen peroxide gel was performed randomly in the upper hemi-arch of each patient...
August 29, 2016: Operative Dentistry
Attila Bagdi, Sándor Tömösközi, Laura Nyström
Feruloylated arabinoxylan (AX) has a unique capacity to form covalent gels in the presence of certain oxidizing agents. The present study demonstrates that hydroxyl radical oxidation does not provoke ferulic acid dimerization and thus oxidative gelation. We studied the hydroxyl radical mediated oxidation of an alkali-extracted AX preparation (purity: 92g/100g dry matter) that showed gel-forming capability upon peroxidase/hydrogen peroxide treatment. Hydroxyl radicals were produced with ascorbate-driven Fenton reaction and the radical formation was monitored with electron paramagnetic resonance, using a POBN/EtOH spin trapping system...
November 5, 2016: Carbohydrate Polymers
Soyoung Park, So Ran Kwon, Fang Qian, Philip W Wertz
PURPOSE: To evaluate the whitening efficacy of a new two-layer technology in-office system compared to a conventional gel-type system and determine hydrogen peroxide penetration (HPP) into the pulp cavity. MATERIALS AND METHODS: Extracted molars (n = 60) were assigned to group NC: glycerol gel; group QPRO: 20% HP varnish (Zoom Quick Pro, Philips Oral Healthcare); group ZOOM_NL: 25% HP gel (Zoom Chairside Whitening); and group ZOOM_WL: 25% HP gel (Zoom Chairside Whitening) with light-activation...
September 2016: Journal of Esthetic and Restorative Dentistry
Maryam Khoroushi, Farinaz Shirban, Sara Kaveh, Samaneh Doustfateme
OBJECTIVES: The aim of this in vitro study was to evaluate the effect of incorporating three different nanobiomaterials into bleaching material on microhardness of bleached enamel. MATERIALS AND METHODS: The crowns of 24 extracted sound human molars were sectioned. Sixty enamel specimens (2 × 3 × 4 mm) were selected and divided into five groups (n = 12): Group 1 received no bleaching procedure (control); Group 2 underwent bleaching with a 40% hydrogen peroxide (HP) gel; Groups 3, 4, and 5 were bleached with a 40% HP gel modified by incorporation of bioactive glass (BAG), amorphous calcium phosphate (ACP) and hydroxyapatite (HA), respectively...
August 2016: Restorative Dentistry & Endodontics
Kwesi Teye, Sanae Numata, Norito Ishii, Rafal P Krol, Atsunari Tsuchisaka, Takahiro Hamada, Hiroshi Koga, Tadashi Karashima, Chika Ohata, Daisuke Tsuruta, Hideyuki Saya, Marek Haftek, Takashi Hashimoto
CD44, a cell surface proteoglycan, is involved in many biological events. CD44 transcripts undergo complex alternative splicing, resulting in many functionally distinct isoforms. To date, however, the nature of these isoforms in human epidermis has not been adequately determined. In this study, we isolated all CD44 transcripts from normal human epidermis, and studied how their expressions are regulated. By RT-PCR, we found that a number of different CD44 transcripts were expressed in human epidermis, and we obtained all these transcripts from DNA bands in agarose and acrylamide gels by cloning...
2016: PloS One
Derya Merve Halacoglu, Kıvanc Yamanel, Saffet Basaran, Duygu Tuncer, Cigdem Celik
OBJECTIVE: The effect of different staining solutions and a bleaching procedure on color stability and surface roughness of a nanohybrid resin composite were evaluated with or without liquid resin polishing (RP). MATERIALS AND METHODS: Ninety-six disc-shaped resin composite specimens (A1 Shade, Z550 Filtek 3M ESPE, St. Paul, MN, USA) were prepared and divided randomly into two groups (n = 48). Liquid RP (BisCover LV, Bisco Inc., Schaumburg, IL, USA) was applied in one group (RP) and not in the other (P)...
July 2016: European Journal of Dentistry
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
Cristina Dupim Presoto, Janaina Freitas Bortolatto, Priscila Petrucelli Freire de Carvalho, Tamara Carolina Trevisan, Michael Christopher Floros, Osmir Batista de Oliveira Junior
Dental bleaching is considered a conservative and biologically safe treatment for discolored teeth. Despite this, one of the major undesirable effects of bleaching is dentin sensitivity which may occur during and after treatment. To address these sensitivity issues, new dental bleaching preparations with lower concentrations of hydrogen peroxide (H2O2) have recently been introduced to the market. This paper presents a clinical case report of a 20-year-old female patient admitted to the Araraquara Dental School, UNESP, Brazil...
2016: Case Reports in Dentistry
A P Mena-Serrano, E Garcia, I Luque-Martinez, Rhm Grande, A D Loguercio, A Reis
OBJECTIVE: To compare the bleaching efficacy and tooth sensitivity (TS) of two hydrogen peroxide (HP) concentrations (20% and 35%) used for in-office bleaching associated or not with a light-emitting diode (LED)/laser light activation. METHOD: Seventy-seven patients with a right maxillary canine darker than A3 were selected for this single-blind randomized trial. The participants were distributed in four groups: bleaching with 35% HP, 35% HP + LED/laser, 20% HP, and 20% HP + LED/laser...
June 28, 2016: Operative Dentistry
Ioana Baldea, Diana Elena Olteanu, Adriana Gabriela Filip, Mihai Cenariu, Diana Dudea, Alina Tofan, Camelia Alb, Marioara Moldovan
OBJECTIVES: Tooth bleaching is one of the most required dental esthetic treatments. However, it can generate side effects like oral irritation, enamel alteration, tooth sensitivity, especially caused by hydrogen peroxide, the main bleaching component of the commercial products. Therefore, development of new tooth bleaching agents, based on natural products, with comparable esthetic results and lower side effects is needed. The aim of this study was to evaluate the biological effects and bleaching efficacy of four experimental bleaching agents, derived from fruit juices, against the commercially available Opalescence (Ultradent, USA)...
June 21, 2016: Clinical Oral Investigations
Maryam Khoroushi, Hamid Mazaheri, Tahere Saneie, Pouran Samimi
BACKGROUND: Despite the absence of dispute about the efficacy of bleaching agents, a prime concern is about their compromising effect on the enamel structure. This in vitro study investigated whether the addition of three different biomaterials, including nano-bioactive glass (n-BG)/nano-hydroxy apetite (n-HA)/nano-amorphous calcium phosphate (n-ACP), to bleaching agents can affect the fracture toughness (FT) and vickers hardness number (VHN) of bovine enamel. MATERIALS AND METHODS: The crowns of the newly extracted permanent bovine incisors teeth were separated from the root and sectioned along their central line; one half serving as the control specimen and the other half as the test specimen...
April 2016: Contemporary Clinical Dentistry
Lina Yonekura, Carolina Aguiar Martins, Geni Rodrigues Sampaio, Marcela Piedade Monteiro, Luiz Antônio Machado César, Bruno Mahler Mioto, Clara Satsuki Mori, Thaíse Maria Nogueira Mendes, Marcelo Lima Ribeiro, Demetrius Paiva Arçari, Elizabeth Aparecida Ferraz da Silva Torres
We assessed the effects of guaraná (Paullinia cupana) consumption on plasma catechins, erythrocyte antioxidant enzyme activity (superoxide dismutase, catalase and glutathione peroxidase) and biomarkers of oxidative stress (ex vivo LDL oxidation, plasma total antioxidant status and ORAC, and lymphocyte single cell gel electrophoresis) in healthy overweight subjects. Twelve participants completed a 15-day run-in period followed by a 15-day intervention with a daily intake of 3 g guaraná seed powder containing 90 mg (+)-catechin and 60 mg (-)-epicatechin...
July 13, 2016: Food & Function
Manuela Cervelli, Alessia Leonetti, Laura Cervoni, Shinji Ohkubo, Marla Xhani, Pasquale Stano, Rodolfo Federico, Fabio Polticelli, Paolo Mariottini, Enzo Agostinelli
Spermine oxidase (SMOX) is a flavin-containing enzyme that specifically oxidizes spermine to produce spermidine, 3-aminopropanaldehyde and hydrogen peroxide. While no crystal structure is available for any mammalian SMOX, X-ray crystallography showed that the yeast Fms1 polyamine oxidase has a dimeric structure. Based on this scenario, we have investigated the quaternary structure of the SMOX protein by native gel electrophoresis, which revealed a composite gel band pattern, suggesting the formation of protein complexes...
October 2016: Amino Acids
Issis Luque-Martinez, Alessandra Reis, Marcos Schroeder, Miguel Angel Muñoz, Alessandro D Loguercio, Danielle Masterson, Lucianne C Maia
OBJECTIVES: The aim of the study was to compare the color change produced by tray-delivered carbamide peroxide [CP] versus hydrogen peroxide products [HP] for at-home bleaching through a systematic review and meta-analysis. MATERIALS AND METHODS: MEDLINE via PubMeb, Scopus, Web of Science, Latin American and Caribbean Health Sciences Literature database (LILACS), Brazilian Library in Dentistry (BBO), and Cochrane Library and Grey literature were searched without restrictions...
September 2016: Clinical Oral Investigations
Chun-Chieh Tseng, Yun-Hsuan Tsai, Anren Hu, Je-Wen Liou, Kai-Chih Chang, Hsin-Hou Chang
Multidrug-resistant Acinetobacter baumannii is a well-documented pathogen associated with hospital-acquired infections. In addition to multidrug resistance, A. baumannii can also become resistant to colistin, the antibiotic treatment of last resort, by the loss of the lipopolysaccharide from its outer membrane. Here, we demonstrate that the development of colistin resistance also increases the resistance of A. baumannii to titanium dioxide (TiO2) photocatalysis. Both colistin-sensitive A. baumannii (CSAB) and colistin-resistant A...
October 2016: Applied Microbiology and Biotechnology
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