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https://www.readbyqxmd.com/read/27915369/at-line-validation-of-a-process-analytical-technology-approach-for-quality-control-of-melamine-urea-formaldehyde-resin-in-composite-wood-panel-production-using-near-infrared-spectroscopy
#1
Roger Meder, Wolfgang Stahl, Paul Warburton, Sam Woolley, Scott Earnshaw, Klaus Haselhofer, Ken van Langenberg, Nick Ebdon, Roger Mulder
The reactivity of melamine-urea-formaldehyde resins is of key importance in the manufacture of engineered wood products such as medium density fibreboard (MDF) and other wood composite products. Often the MDF manufacturing plant has little available information on the resin reactivity other than details of the resin specification at the time of batch manufacture, which often occurs off-site at a third-party resin plant. Often too, fresh resin on delivery at the MDF plant is mixed with variable volume of aged resin in storage tanks, thereby rendering any specification of the fresh resin batch obsolete...
December 3, 2016: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/27913333/super-cell-piezoelectric-composite-with-1-3-connectivity
#2
Remi Rouffaud, Franck Levassort, Mai Pham Thi, Claire Bantignies, Marc Lethiecq, Anne-Christine Hladky-Hennion
The standard fabrication method for 1-3 piezocomposites for ultrasound transducers is the "dice and fill" method (DFM) in which lateral periodicity is introduced. This contributes to the appearance of spurious modes that can drastically affect the performance of the device if they appear near its thickness mode frequency, thus limiting the effective frequency range. A new 1-3 piezocomposite fabricated with a super-cell structure [1-3 super cell (13SC)] was designed in order to overcome these limitations. It consists of the merging of several periodic cells with 47% PZT volume fraction and epoxy resin as the matrix...
December 2016: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/27907867/adsorption-characteristics-of-adsorbent-resins-and-antioxidant-capacity-for-enrichment-of-phenolics-from-two-phase-olive-waste
#3
Zhihong Wang, Chengzhang Wang, Jiaojiao Yuan, Changwei Zhang
In this study, the adsorption properties of nine resins including polyamide resin (30-60), polyamide resin (60-100) AB-8, S-8, D-101, NKA-9, NKA-II, XDA-1 and XDA-4 for enrichment phenolics of the olive waste were investigated. XDA-1 and NKA-II were chosen for further study due to their outstanding adsorption and desorption capacity. XDA-1 and NKA-II had similar adsorption and desorption behaviors for phenolics of olive waste. The adsorption mechanism could be better explained by pseudo second-order kinetics model and Freundlich isotherm model, and the adsorption processes were spontaneously and exothermic...
November 24, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
https://www.readbyqxmd.com/read/27899258/characterization-of-bioactive-constituents-from-the-gum-resin-of-gardenia-lucida-and-its-pharmacological-potential
#4
Priyanka Maurya, Shilpi Singh, Madan Mohan Gupta, Suaib Luqman
In the present study we mined the information on Gardenia lucida (Dikamali) and identified seven polymethoxyflavones from its gum resin. We also investigated its antiproliferative and antioxidant potential. Xanthomicrol (8) found as potent DPPH scavenger (85.86±1.3%) along with strong ferric plummeting ability (53.60±2.0 FSE) and reducing potential (1.07±0.01) as compared to ascorbic acid. Gardenin B (5) strongly inhibit biochemical production of nitric oxide (IC50 10.59±0.4μg/mL) followed by 5-Desmethylnobiletin (7) and Gardenin E (10, IC5011...
November 26, 2016: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27892839/influence-of-adhesive-type-and-placement-technique-on-postoperative-sensitivity-in-posterior-composite-restorations
#5
Trf Costa, M Rezende, A Sakamoto, B Bittencourt, P Dalzochio, A D Loguercio, A Reis
PURPOSE: This double blind, randomized clinical trial compared the postoperative sensitivity of the placement technique (incremental and bulk fill) in posterior composite resin restorations bonded with two different adhesive strategies (self-etch and etch-and-rinse). METHODS: Posterior dental cavities of 72 participants (n=236), with a cavity depth of at least 3 mm, were randomly divided into four groups. The restorations were bonded using either the etch-and-rinse Tetric N-Bond (Ivoclar Vivadent) or the self-etch Tetric N-Bond SE (Ivoclar Vivadent)...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27892838/effect-of-bioactive-primers-on-bacterial-induced-secondary-caries-at-the-tooth-resin-interface
#6
G E Kim, A A Leme-Kraus, R Phansalkar, G Viana, C Wu, S-N Chen, G F Pauli, Akb Bedran-Russo
Secondary caries at the tooth-resin interface is the primary reason for replacement of resin composite restorations. The tooth-resin interface is formed by the interlocking of resin material with hydroxyapatite crystals in enamel and collagen mesh structure in dentin. Efforts to strengthen the tooth-resin interface have identified chemical agents with dentin collagen cross-linking potential and antimicrobial activities. The purpose of the present study was to assess protective effects of bioactive primer against secondary caries development around enamel and dentin margins of class V restorations, using an in vitro bacterial caries model...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27892836/comparison-of-internal-adaptation-in-class-ii-bulk-fill-composite-restorations-using-micro-ct
#7
S H Han, S H Park
PURPOSE: This study compared the internal adaptation of bulk-fill composite restorations in class II cavities and explored the relationship between internal adaptation and polymerization shrinkage or stress. METHODS AND MATERIALS: Standardized mesio-occluso-distal cavities were prepared in 40 extracted human third molars and randomly divided into five groups (n=8). After having been applied by total-etch XP bond (Dentsply Caulk, Milford, DE, USA) and light curing, the teeth were restored with the following resin composites: group 1, Filtek Z350 (3M ESPE, St...
November 28, 2016: Operative Dentistry
https://www.readbyqxmd.com/read/27891629/capping-carious-exposures-in-adults-a-randomized-controlled-trial-investigating-mineral-trioxide-aggregate-versus-calcium-hydroxide
#8
R Kundzina, L Stangvaltaite, H M Eriksen, E Kerosuo
AIM: The aim of this multicentre, parallel-group randomized clinical trial was to compare the effectiveness of mineral trioxide aggregate (MTA) and a conventional calcium hydroxide liner (CH) as direct pulp capping materials in adult molars with carious pulpal exposure. METHODOLOGY: Seventy adults aged 18-55 years were randomly allocated to two parallel arms: MTA (White ProRoot, Dentsply, Tulsa Dental, Tulsa, OK, USA; n = 33) and CH (Dycal(®) , Dentsply DeTrey GmbH, Konstanz, Germany; n = 37)...
November 7, 2016: International Endodontic Journal
https://www.readbyqxmd.com/read/27891467/an-in-vitro-comparative-study-of-shear-bond-strength-of-composite-resin-to-bleached-enamel-using-three-herbal-antioxidants
#9
Pratap Kumar Mukka, Nanda Kumar Komineni, Sambashivarao Pola, E Soujanya, Anand Ramtheerth Karne, Bhasker Nenavath, Sandeep Shiva, Pallavi Vuppunuthula
INTRODUCTION: If adhesive restorations are carried out imme-diately, the Shear Bond Strength (SBS) to bleached enamel is reduced. The use of antioxidants can be highlighted since it seems to be a more effective alternative to reduce or remove the residual oxygen and immediate improvement in SBS. AIM: The purpose of this in-vitro study was an attempt to regain the lost bond strength, for which, the comparison of SBS of composite resin to bleached enamel was carried out using various antioxidants i...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27891456/effect-of-salivary-ph-on-color-stability-of-different-flowable-composites-a-prospective-in-vitro-study
#10
Renu Batra, Pratik Kataria, Sonali Kapoor
INTRODUCTION: Scientifically and clinically there has been lot of development in the field of aesthetic dentistry. However, there is limited or restricted information regarding the color stability of flowable composite materials. AIM: The aim of this study was to evaluate the spectrophotometric color stability of three different flowable composite materials with respect to three different pH of saliva. MATERIALS AND METHODS: The study included 90 different samples...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27890355/the-effects-of-cavity-margin-angles-and-bolus-stiffness-on-the-mechanical-behavior-of-indirect-resin-composite-class-ii-restorations
#11
Pietro Ausiello, Stefano Ciaramella, Franklin Garcia-Godoy, Antonio Gloria, Antonio Lanzotti, Saverio Maietta, Massimo Martorelli
OBJECTIVE: To study the influence of the different class II mesio-occlusal-distal (MOD) cavity shape on the stress and strain distributions in adhesive indirect restorations, using numerical finite element analysis (FEA). To investigate the relationship between restored teeth failure and stiffness of food, three values of Young's modulus were used for the food. METHODS: A 3D model of a sound lower molar and three class II MOD cavities with different shape were created...
November 24, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27889605/posterior-composites-update-on-cavities-and-filling-techniques
#12
J Sabbagh, R J McConnell, M Clancy McConnell
OBJECTIVES: The aim of this paper is to examine cavity design for posterior resin composite restorations and to discuss various resin composite filling techniques. DATA: Literature with regard to cavity preparation for amalgam and resin composite restorations has been reviewed. An overview of available bulkfill resin composite systems is provided and a categorization of these systems according to their clinical application and their intended use is outlined. SOURCES: A literature search was carried out by the authors in Medline...
November 23, 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27887776/critical-role-of-superoxide-anions-and-hydroxyl-radicals-in-hema-induced-apoptosis
#13
H Schweikl, M Godula, C Petzel, C Bolay, K A Hiller, W Buchalla
OBJECTIVE: Resin monomers such as 2-hydroxyethyl methacrylate (HEMA) induce apoptosis because of the excess formation of reactive oxygen species (ROS). The portion of ROS including superoxide anions, hydrogen peroxide or hydroxyl radicals in monomer-induced apoptosis is unknown. Here, the effectiveness of superoxide anions or hydroxyl radicals was analyzed using tempol or sodium formate as radical scavengers. METHODS: RAW264.7 mouse macrophages were exposed to HEMA (0-6-8mM) in the presence of tempol (0-0...
November 22, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27887775/bactericidal-dental-nanocomposites-containing-1-2-3-triazolium-functionalized-poss-additive-prepared-through-thiol-ene-click-polymerization
#14
Saeed Beigi Burujeny, Hamid Yeganeh, Mohammad Atai, Hoshyar Gholami, Marzieh Sorayya
OBJECTIVE: Deterioration of mechanical strength for the dental composite containing ionic bactericidal compounds restricts the widespread utilization of this class of useful materials. This problem is originated from the reduction of the intermolecular interaction of polymeric network due to plasticization effect of absorbed water molecules penetrated between the chain segments. The main goal of this study is the synthesis of the highly efficient bactericidal additive with low hydrophilicity and consequently the least adverse effect on the final mechanical strength of the dental composite...
November 22, 2016: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/27886769/polyethylene-comonomer-characterization-by-using-ftir-and-a-multivariate-classification-technique
#15
Ester Caro, Enric Comas
Many polyethylene (PE) films used in various packaging applications are based on multi-layer systems and are fabricated by using the coextrusion techniques that can combine different raw materials. The identification of the comonomer type (octene - C8, hexene - C6 and butene - C4) in films, where two or more different linear low density polyethylene (LLDPE) resins are present, is becoming a frequent request. This report presents a novel approach where multivariate classification techniques are used in combination with FTIR for the identification of the comonomer type in coextruded films...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27886760/practical-limitations-of-single-particle-icp-ms-in-the-determination-of-nanoparticle-size-distributions-and-dissolution-case-of-rare-earth-oxides
#16
Laurie Fréchette-Viens, Madjid Hadioui, Kevin J Wilkinson
The applicability of single particle ICP-MS (SP-ICP-MS) for the analysis of nanoparticle size distributions and the determination of particle numbers was evaluated using the rare earth oxide, La2O3, as a model particle. The composition of the storage containers, as well as the ICP-MS sample introduction system were found to significantly impact SP-ICP-MS analysis. While La2O3 nanoparticles (La2O3 NP) did not appear to interact strongly with sample containers, adsorptive losses of La(3+)(over 24h) were substantial (>72%) for fluorinated ethylene propylene bottles as opposed to polypropylene (<10%)...
January 15, 2017: Talanta
https://www.readbyqxmd.com/read/27886272/can-long-term-dentine-bonding-created-in-real-life-be-forecasted-by-parameters-established-in-the-laboratory
#17
Heleine M C Rêgo, Thaís S Alves, Eduardo Bresciani, Li-Na Niu, Franklin R Tay, César R Pucci
Tooth-coloured plastic dental fillings secured by adhesives to tooth structures are widely used to fix decayed teeth. Whereas laboratory tests demonstrate rapid deterioration of the ability of the adhesives to stick to dentine, clinical studies show that these fillings are relatively durable. This discrepancy suggests that the parameters used for simulating bond degradation in the laboratory setting do not correlate well with clinical outcomes. The present study examined the long-term tensile bond strength of resin composite fillings performed in real life and under different laboratory-simulated bonding conditions to identify parameters that may be used to forecast the durability of adhesive bonds created in dentine...
November 25, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27881640/polymer-based-material-containing-calcium-phosphate-particles-functionalized-with-a-dimethacrylate-monomer-for-use-in-restorative-dentistry
#18
Marcela C Rodrigues, Tathy A Xavier, Victor E Arana-Chavez, Roberto R Braga
Dicalcium phosphate dihydrate particles functionalized with triethyleneglycol dimethacrylate were synthesized and added to a photocurable mixture of bisphenol-A glycidyl dimethacrylate and triethyleneglycol dimethacrylate with the purpose of developing a resin composite capable of releasing calcium and phosphate ions to foster dental remineralization. Particle functionalization would minimize the deleterious effect of adding low cohesive strength nano-structured particles with no chemical interaction with the organic matrix on the material's mechanical properties...
November 23, 2016: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/27881324/bacterial-adhesion-on-direct-and-indirect-dental-restorative-composite-resins-an-in%C3%A2-vitro-study-on-a-natural-biofilm
#19
Giacomo Derchi, Michele Vano, Antonio Barone, Ugo Covani, Alberto Diaspro, Marco Salerno
STATEMENT OF PROBLEM: Both direct and indirect techniques are used for dental restorations. Which technique should be preferred or whether they are equivalent with respect to bacterial adhesion is unclear. PURPOSE: The purpose of this in vitro study was to determine the affinity of bacterial biofilm to dental restorative composite resins placed directly and indirectly. MATERIAL AND METHODS: Five direct composite resins for restorations (Venus Diamond, Adonis, Optifil, Enamel Plus HRi, Clearfil Majesty Esthetic) and 3 indirect composite resins (Gradia, Estenia, Signum) were selected...
October 27, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27881319/influence-of-remaining-tooth-structure-and-restorative-material-type-on-stress-distribution-in-endodontically-treated-maxillary-premolars-a-finite-element-analysis
#20
Junxin Zhu, Qiguo Rong, Xiaoyan Wang, Xuejun Gao
STATEMENT OF PROBLEM: How tooth preparation and material type affect the stress distribution of endodontically treated teeth restored with endocrowns remains unclear. PURPOSE: The purpose of this finite element (FE) study was to determine the influence of the quantity of remaining dental tissues and material type on stress distribution in endodontically treated maxillary premolars using 3-dimensional FE analysis. MATERIAL AND METHODS: Five 3-dimensional FE models were constructed on the basis of the restorative methods used and the quantity of preserved tooth tissues: a sound maxillary premolar, an endodontically treated maxillary premolar restored with composite resin, and endodontically treated maxillary premolars restored with endocrowns with thicknesses of 1...
October 27, 2016: Journal of Prosthetic Dentistry
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