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bond strength

Xinying Li
Mechanisms of Ag-X and Ag…H2 interactions and stabilities of T-shaped H2 -AgX (X = F - I) series were investigated at the CCSD(T) level. The "no-density" bond with smaller positive Laplacian and ELF values in interaction regions, as well as considerable delocalization index values, suggest weak covalent "charge-shift" character for the Ag…H2 interaction. Structure and stability dependence on the electric field were investigated at the MP2 level. Relative total energy curves show obvious parabolic character, and the plots can be fitted by quadratic polynomials as functions of electric field strength...
June 16, 2018: Journal of Molecular Modeling
Tyler J D'Ovidio, Rebecca M Roberts, Dixa Gautam, Zefram D Marks, Manju Saraswathy, Jeffrey W Stansbury, Devatha P Nair
The enhanced in situ photopolymerization kinetics of methyl methacrylate (MMA) to poly(methyl methacrylate) (PMMA) through the incorporation of both inert and reactive nanogel (NG) fillers under ambient conditions has been demonstrated. In addition to the polymerization kinetics, the physical and chemical properties of the prepolymeric NG were also utilized to tune the thermoplasticity and mechanical properties of the PMMA polymer network. The protocol followed in this study imparts superior MMA photopolymerization kinetics (≥ 60% double-bond conversion within 15 min for > 35 wt% nanogel loadings and ≥ 95% double-bond conversion in < 60 min for all NG concentrations) when compared with traditional polymerization mechanisms...
June 2, 2018: Journal of the Mechanical Behavior of Biomedical Materials
John T Kelly, Martin Mayer, Adam C Kennedy, Christian Schemel, Knut R Asmis
We investigate the perchlorate anion, ClO4 - , microhydrated with up to eight water molecules using infrared photodissociation (IRPD) spectroscopy aided by density functional theory computations. The features observed in the IRPD spectra of D2 -tagged ClO4 - (H2 O)n with n = 0-8 in the O-H stretching (2800-3800 cm-1 ) and fingerprint (800-1800 cm-1 ) spectral ranges are assigned to vibrational modes of the solvent, i.e., free and hydrogen-bonded O-H stretching and H2 O bending modes, and of the solute, i.e...
June 14, 2018: Journal of Chemical Physics
Jiawei Chen, Nadine Yassin, Thilina Gunasekara, Jack R Norton, Michael Rauch
The 2,3-dimethylbutadiene complexes of Group 4 metals with constrained geometry (cg) ligands have been prepared and found to adopt a supine orientation with σ2 ,π bonding. Treatment of cgTi(2,3-dimethylbutadiene) (1-Ti) with t BuNC leads to the formation of a titanaaziridine (3) with a coordinated cyclopentenimine that arises from the formal [4+1] addition of the diene to the isonitrile. In contrast, the reactions of cgZr(2,3-dimethylbutyldiene) (1-Zr) or cgHf(2,3-dimethylbutyldiene) (1-Hf) with 2 equiv of t BuNC or XyNC proceeded in a more sophisticated manner to yield unsymmetrical 2,5-diazametallacyclopentane derivatives (4, 6-Zr, and 6-Hf) or symmetrical 2,5-diazametallacyclopentene complexes (7-Zr, and 7-Hf)...
June 15, 2018: Journal of the American Chemical Society
Shane Jacobeen, Elyes C Graba, Colin G Brandys, Thomas C Day, William C Ratcliff, Peter J Yunker
The evolutionary transition to multicellularity transformed life on earth, heralding the evolution of large, complex organisms. Recent experiments demonstrated that laboratory-evolved multicellular "snowflake yeast" readily overcome the physical barriers that limit cluster size by modifying cellular geometry [Jacobeen et al., Nat. Phys. 14, 286 (2018)10.1038/s41567-017-0002-y]. However, it is unclear why this route to large size is observed, rather than an evolved increase in intercellular bond strength...
May 2018: Physical Review. E
F A Spitznagel, J Boldt, P C Gierthmuehlen
Advances in computer-aided design (CAD) / computer-aided manufacturing (CAM) technologies and their ease of application enabled the development of novel treatment concepts for modern prosthodontics. This recent paradigm shift in fixed prosthodontics from traditional to minimally invasive treatment approaches is evidenced by the clinical long-term success of bonded CAD/CAM glass-ceramic restorations. Today, defect-oriented restorations, such as inlays, onlays, and posterior crowns, are predominately fabricated from glass-ceramics in monolithic application...
June 1, 2018: Journal of Dental Research
Thuy Le, Hiroki Maki, Emiko Okazaki, Kazufumi Osako, Kigen Takahashi
Influence of various phenolic compounds on physical properties and antioxidant activity of gelatin film from horse mackerel Trachurus japonicus scales was investigated. Tensile strength (TS) of the film was enhanced whereas elongation at break was declined by adding 1% to 5% phenolic compounds. Rutin was the most effective to improve the TS compared to the other tested phenolic compounds including ferulic acid, caffeic acid, gallic acid, and catechin. Gelatin films with the phenolic compounds showed the excellent UV barrier properties...
June 15, 2018: Journal of Food Science
Yi Hu, Shaogang Xu, Kai Miao, Xinrui Miao, Wenli Deng
Fabricating complex nano-networks on solid substrates is a research area that has attracted much attention in the field of molecular self-assembly. By designing a fluorenone derivative of 2-heptyloxy-7-pentadecyloxy-9-fluorenone (HPF), we obtained a surface-confined system that presented diverse nanostructures. The assembled networks for HPF were highly dependent on the solvent and concentration. At the liquid/solid interface, chiral tetramer-S, hexamer-S, and tetramer-linear structures as well as achiral irregular-linear and random structures were recorded...
June 15, 2018: Physical Chemistry Chemical Physics: PCCP
Jéssika Mayhara Pereira Morais, Keli Regina Victorino, Wilfredo Gustavo Escalante-Otárola, Keren Cristina Fagundes Jordão-Basso, Regina Guenka Palma-Dibb, Milton Carlos Kuga
The aim of the study was to evaluate the effects when acid etching on the dentin surface was immediately performed (I) or 7 days (D) after calcium silicate-based sealer (MTA Fillapex) removal, using 95% ethanol (E) or xylol (X). First study, 60 bovine incisor dentin specimens were impregnated with sealer and divided into six groups (n = 10): (EI), E + I; (XI), X + I; (ED), E + D; (XD), X + D, (UN), untreated and (MR), mechanical removal of sealer. Scanning electron microscopy (SEM) images (500×) were obtained from each specimen and scores assessed the sealer residues persistence...
June 15, 2018: Microscopy Research and Technique
Sai Kham Lyann, Tomohiro Takagaki, Toru Nikaido, Motohiro Uo, Masaomi Ikeda, Alireza Sadr, Junji Tagami
PURPOSE: To evaluate the influence of different surface treatments of lithium disilicate glass ceramics on the bonding efficacy of three luting composites. MATERIALS AND METHODS: A total of 450 blocks of e.max CAD (Ivoclar Vivadent) ground with 600-grit silicon carbide paper were prepared and divided into three groups (n = 150) according to the composite cements used: Variolink Esthetic DC (VE), Multilink Automix (MA), and SpeedCEM (SC). Each group was further divided into five subgroups (n = 10) according to the surface treatment performed: no treatment (control), Monobond Plus (MP), 37% phosphoric acid and Monobond Plus (PA), < 5% hydrofluoric acid and Monobond Plus (HF), and Monobond Etch & Prime (ME)...
June 14, 2018: Journal of Adhesive Dentistry
Lucas Saldanha da Rosa, Andressa Cargnelutti Follak, Tathiane Larissa Lenzi, Rachel de Oliveira Rocha, Fabio Zovico Maxnuck Soares
PURPOSE: To examine the influence of phosphoric acid containing chlorhexidine on the dentin bond stability of a universal and a 2-step etch-and-rinse adhesive. MATERIALS AND METHODS: Eighty sound bovine incisors were randomly assigned to 8 groups (n = 10) according to: phosphoric acid (37% phosphoric acid [CTR] or 37% phosphoric acid with 2% chlorhexidine [CHX]); adhesive (Scotchbond Universal Adhesive [SBU]or Adper Single Bond 2 [SB2]); and water storage time (24 h and 6 months)...
June 14, 2018: Journal of Adhesive Dentistry
Yuanyuan Li, Ming Fang, Fan Yu, Lina Niu, Franklin Tay, Jihua Chen
PURPOSE: The present study evaluated the influence of air entrapment within demineralized dentin on bond strength, nanoleakage, and degree of conversion. MATERIALS AND METHODS: A vacuum pump with adjustable pressure was used to control the gaseous pressure of a sealed container during the application of a two-step etch-and-rinse adhesive to demineralized dentin. Atmospheric pressure was used as control, and reduced pressures (0.08, 0.06, 0.04 MPa) as experimental variables...
June 14, 2018: Journal of Adhesive Dentistry
Ozcan Karatas, Yusuf Ziya Bayindir
Objective: This study aimed to evaluate the dentin bond strength and degree of polymerization of bulk-fill and methacrylate-based flowable composites. Materials and Methods: Dentin bond strength of composites was evaluated using the microtensile bond strength (μTBS) test. Five different composites were applied on flat dentin surfaces with self-etch and etch-and-rinse adhesives. Twenty microspecimens with a 1 mm2 cross-sectional area were prepared for each group ( n = 20)...
May 2018: Journal of Conservative Dentistry: JCD
Hacer Balkaya, Sezer Demirbuga, Nazire Nurdan Çakir, Muhammed Karadas, Yahya Orcun Zorba
Aim: The aim of this study was to investigate the adhesive performance of three different universal adhesives to repair aged amalgam by composite resins with or without Alloy Primer. Materials and Methods: Sixty amalgam samples were prepared, aged, and randomly divided into 12 main groups according to adhesive procedures used. Composite buildups were placed on amalgam surfaces. After micro-shear bonding test, the fracture surfaces were examined under the scanning electron microscopy statistical analysis was performed using two-way analysis of variance and Tukey's post hoc tests...
May 2018: Journal of Conservative Dentistry: JCD
Nazire Nurdan Çakir, Sezer Demirbuga, Hacer Balkaya, Muhammet Karadaş
Aim: This study aims to investigate the adhesive performance of three different universal adhesives to repair aged composite restorations, with or without the application of silane. Materials and Methods: A hundred and twenty resin composite samples were prepared, aged and randomly divided into 6 main Groups (single bond universal [SBU], All-Bond Universal [ABU], Futurabond U, Clearfil Tri-S Bond, Single Bond 2, and Clearfil SE Bond) and 2 subgroups (with or without silane)...
May 2018: Journal of Conservative Dentistry: JCD
Pantelis Kouros, Eugenia Koliniotou-Koumpia, Maria Spyrou, Elisabeth Koulaouzidou
Objectives: The aim of this study is to investigate the influence of the composite material and surface treatment to the bond strength when repairing an aged composite surface with new composite. Materials and Methods: One hundred and sixty resin blocks of methacrylate composite and silorane composite prepared and aged in artificial saliva for 6 months. Specimens treated either with a diamond bur (DB) or air abrasion (AA), conditioned with orthophosphoric acid (OA) or sodium hypochloride (SH) and repaired with methacrylate or silorane composite using the corresponding adhesive system...
May 2018: Journal of Conservative Dentistry: JCD
Masoumeh Ebrahimi, Anoosheh Janani, Sara Majidinia, Ramin Sadeghi, Alireza Sarraf Shirazi
The purpose of this study was to systematically evaluate the dentin bond strength of etch-and-rinse and self-etch adhesives to primary teeth. In this study, PubMed, ISI (all databases), Scopus, and Cochrane Database were searched according to the selected keywords up to May 11, 2016. The full texts of published articles that appeared to meet the primary criteria for inclusion in this study were obtained. Due to the variation in the methods used, the studies were divided into 2 groups: Group 1 - studies that evaluated the micro-tensile bond strengths (MTBSs) of two-step etch-and-rinse adhesives and two-step self-etch adhesives and Group 2 - studies that evaluated the MTBSs of two-step etch-and-rinse adhesives and one-step self-etch adhesives...
May 2018: Journal of Conservative Dentistry: JCD
Yu Fu, Emre Selcuk, Sarah R Moore, Richard A Depue
Soft touch possesses strong prosocial effects that facilitate social bonding and group cohesion in animals. Touch activates opioids (OP) and oxytocin (OXT), two neuromodulators involved in affiliative behaviors and social bonding. We examined whether touch serves as an unconditioned reward in affective conditioning of human faces, a basic process in social bonding, and whether this process is mediated by variation in mu-OP (OPRM1) and OXT (rs53576) receptor genes. Participants viewed affectively-neutral human faces, half of which were paired with a brief soft brushing on the forearm as an unconditioned stimulus (US)...
June 13, 2018: Scientific Reports
Arie Steinvil, Kyle D Buchanan, Sarkis Kiramijyan, Elizabeth Bond, Toby Rogers, Edward Koifman, Christian Shults, Linzhi Xu, Rebecca Torguson, Petros G Okubagzi, Augusto D Pichard, Lowell F Satler, Itsik Ben-Dor, Ron Waksman
BACKGROUND: The impact of frailty assessment on outcomes in patients undergoing transcatheter aortic valve replacement (TAVR) remains unclear. Our aim was to evaluate the individual effect of each frailty test and the utility of an additive frailty index score on short- and long-term survival following TAVR. METHODS: Retrospective analysis of consecutive TAVR patients for whom a complete set of frailty tests was obtained: algorithm defined grip strength and 5-m walking tests, body mass index <20 kg/m2 , Katz activities of daily living ≤4/6, serum albumin <3...
June 2018: American Heart Journal
Somayeh Ramezanian, Hien Xuan Ta, Balasingam Muhunthan, Nehal Abu-Lail
Biofilms in soil can offer solutions to many geotechnical problems. Controlling biofilm formation in soil requires a fundamental understanding of how bacterial cells interact with soil under relevant environmental conditions. Here, atomic force microscopy (AFM) was used to quantify the adhesion forces acting between a model soil microbe, Pseudomonas putida, and a model of quartz sand under a range of ionic strengths (ISs; 0.02M-0.52M) that bracket common environmental conditions present in soil. AFM forces were decoupled into specific and nonspecific components following the established Poisson statistical analysis method...
June 13, 2018: Biointerphases
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