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https://www.readbyqxmd.com/read/28327437/evaluating-the-effect-of-antioxidant-agents-on-shear-bond-strength-of-tooth-colored-restorative-materials-after-bleaching-a-systematic-review
#1
REVIEW
Atiyeh Feiz, Hamid Mosleh, Rahman Nazeri
PURPOSE: The main objective of the present study was to make a systematic review of how antioxidant agents affect shear bond strength of tooth-colored restorative materials after bleaching. DATA SOURCES: Electronic search was used to extract the related articles on the targeted key words such as "antioxidant", "dental bleaching" and "shear bond strength" (SBS) from MeSH, PubMed, Medline, and Cochrane electronic data bases. These articles were all published before 2016...
March 10, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28327301/dentin-bond-optimization-using-the-dimethyl-sulfoxide-wet-bonding-strategy-a-2-year-in-vitro-study
#2
Thiago Henrique Scarabello Stape, Leo Tjäderhane, Arzu Tezvergil-Mutluay, Cristiane Rumi Fujiwara Yanikian, Anna Luiza Szesz, Alessandro Dourado Loguercio, Luís Roberto Marcondes Martins
OBJECTIVE: This study evaluated a new approach, named dimethyl sulfoxide (DMSO)-wet bonding, to produce more desirable long-term prospects for the ultrafine interactions between synthetic polymeric biomaterials and the inherently hydrated dentin substrate. METHODS: Sound third molars were randomly restored with/without DMSO pretreatment using a total-etch (Scocthbond Multipurpose: SBMP) and a self-etch (Clearfil SE Bond: CF) adhesive systems. Restored teeth (n=10)/group were sectioned into sticks and submitted to different analyses: micro-Raman determined the degree of conversion inside the hybrid layer (DC); resin-dentin microtensile bond strength and fracture pattern analysis at 24h, 1year and 2 years of aging; and nanoleakage evaluation at 24h and 2 years...
December 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28326734/-research-on-bond-durability-among-different-core-materials-and-zirconia-ceramic-cemented-by-self-adhesive-resin-cements
#3
Luo Xinyu, Meng Xiangfeng
OBJECTIVE: This research estimated shear bond durability of zirconia and different substrates cemented by two self-adhesive resin cements (Clearfil SA Luting and RelyX U100) before and after aging conditioning. METHODS: Machined zirconia ceramic discs were cemented with four kinds of core material (cobalt-chromium alloy, flowable composite resin core material, packable composite resin, and dentin) with two self-adhesive resin cements (Clearfil SA Luting and RelyX U100)...
February 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28326726/-effects-of-different-surface-modifications-on-micro-structure-and-adhesion-of-zirconia-ceramic-an-in-vitro-study
#4
Li Siwen, Li Shishi, Wang Yanhong, Ma Hongmei
OBJECTIVE: This study evaluated the effect of different mechanical-chemical surface treatments on the characteristics, microstructure, and composition of zirconia ceramics and on the zirconia-dentin adhesion. METHODS: The sintered commercial zirconia blocks (IPS e.max ZirCAD) were sectioned into 126 beams (6 mm×6 mm×5 mm) and randomly assigned to seven experimental groups (n=18). The zirconia block specimens were further treated as follows: (A) untreated, as control; (B) sandblasted with 50 μm Al2O3; (C) sandblasted with 50 μm Al2O3+30 μm silica powder; (D) sandblasted with 50 μm Al2O3+30% silica-sol coating; (E) sandblasted with 110 μm Al2O3; (F) sandblasted with 110 μm Al2O3+30 μm silica powder; and (G) sandblasted with 110 μm Al2O3+30% silica-sol coating...
February 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28323099/nanohydrogel-with-n-n-bis-acryloyl-cystine-crosslinker-for-high-drug-loading
#5
Marcin Mackiewicz, Jan Romanski, Ewa Drozd, Beata Gruber-Bzura, Piotr Fiedor, Zbigniew Stojek, Marcin Karbarz
Substantially improved hydrogel particles based on poly(N-isopropylacrylamide) (pNIPA) have been obtained. First, as a result of replacing commercially available N,N'-bis(acryloyl)cystamine (BAC), the crosslinker, with acryloyl derivative of cystine containing a carboxylic group (BISS), the hydrogel particles acquired improved stability vs. ionic strength and allowed further chemical modification of the chains, including the attachment of drug molecules. Next, a redox-initiated aqueous precipitation polymerization via the semi-batch method was used...
March 18, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28322603/bond-strength-of-abraded-and-non-abraded-bleached-enamel-to-resin-after-er-cr-ysgg-laser-irradiation
#6
Pedro H C Oliveira, Alessandra Cassoni, Aldo Brugnera, Ilana P Tenório, José A Rodrigues
OBJECTIVE: The objective of the study was to evaluate the microtensile bond strength (μTBS) of a composite resin to abraded or non-abraded bleached enamel after Er,Cr:YSGG laser irradiation and to observe the fracture patterns of the tested interfaces. MATERIALS AND METHODS: Two hundred twenty-eight bovine incisors were sectioned, resulting in 228 enamel blocks (7 × 4 × 4 mm(3)) that were divided into 12 groups (n = 19) according to the factors "adhesion" after bleaching (immediate adhesion; after 14 days; and a control group with adhesion on unbleached teeth); enamel "abrasion" (with or without abrasion simulating cavity preparation); and "laser" (with or without Er,Cr:YSGG laser irradiation)...
March 16, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28322056/preparation-of-ultrathin-robust-nanohybrid-capsules-through-a-beyond-biomineralization-method
#7
Shaohua Zhang, Zhongyi Jiang, Weilun Qian, Jiafu Shi, Xiaoli Wang, Lei Tang, Hongjian Zou, Hua Liu
Herein, a facile and generic method is developed to prepare ultrathin, robust nanohybrid capsules by manipulating the dynamic structure of supramolecular nanocoatings on CaCO3 sacrificial templates through incorporating multivalent-anion substitution process into biomineralization. Above biomineralization level, multivalent anions, e.g., phosphate, sulfate or citrate, are employed to initiate the assembly of polyamine into continuous (non-segregated) polyamine-anion supramolecular nanocoatings on CaCO3 sacrificial templates...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28321783/biological-and-mechanical-effects-of-micro-nanostructured-titanium-surface-on-an-osteoblastic-cell-line-in-vitro-and-osteointegration-in-vivo
#8
Jingzu Hao, Ying Li, Baoe Li, Xiaolin Wang, Haipeng Li, Shimin Liu, Chunyong Liang, Hongshui Wang
Hybrid micro-nanostructure implant surface was produced on titanium (Ti) surface by acid etching and anodic oxidation to improve the biological and mechanical properties. The biological properties of the micro-nanostructure were investigated by simulated body fluid (SBF) soaking test and MC3T3-E1 cell co-culture experiment. The cell proliferation, spreading, and bone sialoprotein (BSP) gene expression were examined by MTT, SEM, and reverse transcription-polymerase chain reaction (RT-PCR), respectively. In addition, the mechanical properties were evaluated by instrumented nanoindentation test and friction-wear test...
March 20, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28318259/ammonia-borane-clusters-energetics-of-dihydrogen-bonding-cooperativity-and-role-of-electrostatics
#9
Kunduchi Periya Vijayalakshmi, Cherumuttathu H Suresh
Cluster formation of ammonia borane (NH3BH3) driven by non-covalent H...H dihydrogen interaction is investigated at M06L/6-311+G(d,p) level density functional theory. For clusters containing up to six monomers, ladder, cyclic, stacked, cross-stacked, end-on, mixed and hexagonal configurations have been screened for their energetic stability. In the dimer, 7.94 kcal/mol stabilization energy per monomer (E(m)) is observed. Compared to ladder and cyclic configurations, a tetramer consisting of stacked dimer units is more stable by 3...
March 20, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28317744/molecular-study-of-mucin-procyanidin-interaction-by-fluorescence-quenching-and-saturation-transfer-difference-std-nmr
#10
Elsa Brandão, Mafalda Santos Silva, Ignacio García-Estévez, Nuno Mateus, Victor de Freitas, Susana Soares
Astringency is closely related to the interaction between procyanidins and salivary proteins (SP). The aim of this work was to study the interaction between mucin, a SP responsible for saliva lubricating properties, with different procyanidins (B4 dimer, tetramer (TT) and fractions of oligomeric procyanidins), and the influence of several conditions [pH, ionic strength, procyanidins' mean degree of polymerization (mDP) and different solvents (ethanol or dimethylsulfoxide)] on this interaction by fluorescence quenching and Saturation Transfer Difference (STD)-NMR...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28317350/-effects-of-dentin-demineralization-and-bond-strength-properties-of-bioactive-glass-containing-resin-adhesive
#11
Wang Yu, Gong Ling, Ji Yan, Zheng Lichun, Chen Song
OBJECTIVE: This study investigated the shear bond strength and the ability of resin adhesive containing different amounts of bioactive glass (BG) to prevent dentin demineralization. METHODS: BG bonds at 30%, 40%, and 50% concentrations comprised a mixture of coupling agents modifying BG and Single Bond 2. Forty permanent premolars extracted for orthodontic treatment were randomly divided into four groups, namely, control group (BG-free), 30% BG group, 40% BG group, and 50% BG group...
August 1, 2016: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/28316816/crystal-structure-of-9-20-dimethyl-1-8-12-19-tetra-aza-tetra-cyclo-17-3-1-0-2-7-0-13-18-tricosane-dihydrate-from-synchrotron-x-ray-data
#12
Dohyun Moon, Jong-Ha Choi
The structure of the title compound, C21H40N4·2H2O, has been determined from synchrotron X-ray radiation data. The asymmetric unit comprises one 12-membered macropolycycle and two lattice water mol-ecules. The macropolycycle contains two cyclo-hexane rings and one 1,3-di-aza-cyclo-hexane ring, all in chair conformations. The C-N and C-C bond lengths are in the ranges 1.4526 (16)-1.4786 (17) and 1.517 (2)-1.5414 (17) Å, respectively. One intra-molecular N-H⋯N hydrogen bond helps to stabilize the mol-ecular conformation while medium-strength inter-molecular N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds involving the lattice water mol-ecules connect the components into a three-dimensional network...
March 1, 2017: Acta Crystallographica. Section E, Crystallographic Communications
https://www.readbyqxmd.com/read/28316233/dna-linkers-and-diluents-for-ultrastable-gold-nanoparticle-bioconjugates-in-multiplexed-assay-development
#13
Samuel S Hinman, Kristy S McKeating, Quan Cheng
A novel bioconjugation strategy leading to ultrastable gold nanoparticles (AuNPs), utilizing DNA linkers and diluents in place of traditional self-assembled monolayers, is reported. The protective capacity of DNA confers straightforward biomolecular attachment and multi-step derivatization capabilities to these nanoparticles, and more significantly, substantially enhances their stability in demanding and complex sensing environments. The DNA/AuNPs were assembled through pH-assisted thiol-gold bonding of single stranded DNA and salt aging, with pre-conjugated biotin moieties facing outward from the gold surface...
March 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28315768/peptide-protein-interactions-within-human-hair-keratins
#14
Célia F Cruz, Teresa Matamá, Artur Cavaco-Paulo
We selected 1235 decapeptides from human hair proteins encoded by human genes of keratins and keratin associated proteins. The peptides were linked to glass arrays and screened for their affinity towards a solution of human hair extracted keratin fraction. Based on the physicochemical properties of the peptides, ten variables were studied: content of different types of amino acid side chains (cysteine, hydrophobic, polar, basic, acidic, aromatic rings, amide, alcohol side chains), isoelectric point, and net charge...
March 15, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28315493/an-osteogenesis-angiogenesis-stimulation-artificial-ligament-for-anterior-cruciate-ligament-reconstruction
#15
Hong Li, Jinyan Li, Jia Jiang, Fang Lv, Jiang Chang, Shiyi Chen, Chengtie Wu
To solve the poor healing of polyethylene terephthalate (PET) artificial ligament in bone tunnel, copper-containing bioactive glass (Cu-BG) nanocoatings on PET artificial ligaments were successfully prepared by pulsed laser deposition (PLD). It was hypothesized that Cu-BG coated PET (Cu-BG/PET) grafts could enhance the in vitro osteogenic and angiogenic differentiation of rat bone marrow mesenchymal stem cells (rBMSCs) and in vivo graft-bone healing after anterior cruciate ligament (ACL) reconstruction in a goat model...
March 14, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28315376/effect-of-a-novel-quaternary-ammonium-silane-cavity-disinfectant-on-durability-of-resin-dentine-bond
#16
D Umer, C K Y Yiu, M F Burrow, L-N Niu, F R Tay
OBJECTIVE: The present study examined the effect of a quaternary ammonium silane (QAS) cavity disinfectant on the viability of human dental pulp cells, dentine bond durability and nanoleakage of simplified etch-and-rinse adhesives. METHODS: Etched dentine surface of third molars were randomly divided into two adhesive groups, Adper™ Single Bond 2 and Prime & Bond(®) NT™. For each adhesive, the teeth were randomly assigned to five cavity disinfectant groups (N=6): Group 1: deionised water (control); Group 2: 2% chlorhexidine (CHX); Group 3: 2% QAS; Group 4: 5% QAS and Group 5: 10% QAS...
March 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28304406/organometallic-chemistry-using-partially-fluorinated-benzenes
#17
Sebastian D Pike, Mark R Crimmin, Adrian B Chaplin
Fluorobenzenes, in particular fluorobenzene (FB) and 1,2-difluorobenzene (1,2-DiFB), are increasingly becoming recognised as versatile solvents for conducting organometallic chemistry and transition-metal-based catalysis. The presence of fluorine substituents reduces the ability to donate π-electron density from the arene and consequently fluorobenzenes generally bind weakly to metal centres, allowing them to be used as essentially non-coordinating solvents or as readily displaced ligands. In this context, examples of well-defined complexes of fluorobenzenes are discussed, including trends in binding strength with increasing fluorination and different substitution patterns...
March 17, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28303213/3d-nanomolding-and-fluid-mixing-in-micromixers-with-micro-patterned-microchannel-walls
#18
Bahador Farshchian, Alborz Amirsadeghi, Junseo Choi, Daniel S Park, Namwon Kim, Sunggook Park
Microfluidic devices where the microchannel walls were decorated with micro and nanostructures were fabricated using 3D nanomolding. Using 3D molded microfluidic devices with microchannel walls decorated with microscale gratings, the fluid mixing behavior was investigated through experiments and numerical simulation. The use of microscale gratings in the micromixer was predicated by the fact that large obstacles in a microchannel enhances the mixing performance. Slanted ratchet gratings on the channel walls resulted in a helical flow along the microchannel, thus increasing the interfacial area between fluids and cutting down the diffusion length...
2017: Nano Converg
https://www.readbyqxmd.com/read/28301018/physicochemical-properties-and-dentin-bond-strength-of-a-tricalcium-silicate-based-retrograde-material
#19
Camila de Paula Telles Pires Lucas, Raqueli Viapiana, Roberta Bosso-Martelo, Juliane Maria Guerreiro-Tanomaru, Josette Camilleri, Mário Tanomaru-Filho
The aim of this study was to evaluate the physicochemical properties and the apical dentin bond strength of the tricalcium silicate-based Biodentine in comparison to white MTA and zinc oxide eugenol-based cement (ZOE). Setting time and radiopacity were evaluated according to ISO 6876:2012 specification. Final setting time, compressive strength and pH were also assessed. Material's bond strength to the apical root canal dentin was measured by the push-out assay. Data were analyzed by ANOVA and Tukey-Krammer post-hoc test...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28301010/effect-of-sonic-vibrations-on-bond-strength-of-fiberglass-posts-bonded-to-root-dentin
#20
Amanda Mahammad Mushashe, Rodrigo Otavio Jatahy Ferreira do Amaral, Carlos Eduardo Edwards Rezende, Flares Baratto Filho, Leonardo Fernandes da Cunha, Carla Castiglia Gonzaga
Sonic vibrations may improve the bond strength and durability of fiberglass posts by improving adhesive penetration into dentin as well as the cement flow. The objective of this study was to evaluate the effect of sonic vibrations on the bond strength between fiberglass posts and root dentin using the pull-out test. Bovine roots were endodontically treated and divided randomly into four groups (n=12): Group C - conventional cementation (control); Group SA - sonic vibration (Smart Sonic Device, FGM) of the adhesive system and conventional post accommodation; SP group - conventional adhesive application and sonic vibration of the post during accommodation; and SASP - sonic vibration of the system adhesive and the post during accommodation...
January 2017: Brazilian Dental Journal
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