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Nidambur Vasudev Ballal, Özgür İlke Ulusoy, Shubha Chhaparwal, Kishore Ginjupalli
To compare the effects of different chelating agents on the push-out bond strength of calcium silicate-based cements to the simulated root-end cavities. Root-end cavities were prepared on the roots of fifty extracted maxillary anterior teeth. The specimens were then randomly divided into 5 groups (n = 10) based on the final irrigation regimen: Group 1: 17% EDTA, Group 2: 7% maleic acid, Group 3: QMix, Group 4: 2.25% peracetic acid (PAA), Group 5: 0.9% saline. Then, the samples from each group were subdivided into two groups (n = 5) based on the apical filling material...
November 11, 2017: Microscopy Research and Technique
Ayana Uraba, Reina Nemoto, Kosuke Nozaki, Tasuku Inagaki, Satoshi Omori, Hiroyuki Miura
PURPOSE: To investigate stress and strain concentrations on resin-bonded fixed dental prostheses (RBFDPs) frameworks of different design using finite element analysis. METHODS: A human dry skull was scanned and models were produced using three-dimensional printer. After abutment preparation, three frameworks, including a three-unit RBFDP, and two-unit cantilevered RBFDPs using #21 and #23 for the abutment tooth, were fabricated. Scanned data were subtracted to define boundary of each structure...
November 8, 2017: Journal of Prosthodontic Research
Ascensión Vicente, Antonio José Ortiz Ruiz, Miriam García López, Yolanda Martínez Beneyto, Luis-Alberto Bravo-González
The aim of this study was to evaluate the elemental content and morphology of enamel subjected to demineralization cycles after bracket debonding, adhesive remnant removal, and application of a fluoride varnish. 125 bovine teeth were divided into five groups (n = 25): 1) Intact enamel; 2) Intact enamel + demineralization cycles (DC); 3) Enamel after adhesive removal; 4)Enamel after adhesive removal + DC; 5) Enamel after adhesive removal + Profluorid + DC. The weight percentages of calcium (Ca), phosphorous (P) and fluoride (F) were calculated using energy dispersive X-ray spectroscopy (EDX)...
November 9, 2017: Scientific Reports
Preetika Karnal, Paul Roberts, Stefan Gryska, Courtney King, Carlos Barrios, Joelle Frechette
We investigate the effect of an aqueous environment on the adhesion of a model acrylic pressure sensitive adhesive (PSA) composed of 2-ethylhexylacrylate-co-acrylic acid. We use probe-tack adhesion measurements accompanied by in situ imaging of the contact region during bonding and debonding. Within the probe-tack tests we use both hydrophilic (piranha and plasma treatment) and hydrophobic (C18-silanization) surface treatments to investigate the contribution of probe's surface energy on the underwater adhesion...
November 7, 2017: ACS Applied Materials & Interfaces
G T Rocca, R Daher, C M Saratti, R Sedlacek, T Suchy, A J Feilzer, I Krejci
OBJECTIVES: to explore fatigue limits of ceramic endocrowns for premolars. METHODS: Forty-eight devitalized premolars were cut at the CEJ. They were restored with standardized CAD-CAM lithium disilicate reinforced ceramic restorations (IPS e.max CAD, Ivoclar-Vivadent) and divided into four Groups (n=12): overlays (Group A, no endo-core, negative control), endocrowns with an endo-core of 2mm (Group B), 4mm (GroupC) and crowns with post and core (Group D, positive control)...
October 26, 2017: Journal of Dentistry
Ines Kutzner, Geir Hallan, Paul Johan Høl, Ove Furnes, Øystein Gøthesen, Wender Figved, Peter Ellison
Background and purpose - Registry-based studies have reported an increased risk of aseptic tibial loosening for the cemented Low Contact Stress (LCS) total knee replacement compared with other cemented designs; however, the reasons for this have not been established. We made a retrieval analysis with the aim of identifying the failure mechanism. Patients and methods - We collected implants, cement, tissue, blood, and radiographs from 32 failed LCS Complete cases. Damage to the tibial baseplate and insert was assessed...
November 6, 2017: Acta Orthopaedica
M A Buttaro, J I Oñativia, P A Slullitel, M Andreoli, F Comba, G Zanotti, F Piccaluga
AIMS: The Corail stem has good long-term results. After four years of using this stem, we have detected a small group of patients who have presented with symptomatic metaphyseal debonding. The aim of this study was to quantify the incidence of this complication, to delineate the characteristics of patients presenting with this complication and to compare these patients with asymptomatic controls to determine any important predisposing factors. PATIENTS AND METHODS: Of 855 Corail collarless cementless stems implanted for osteoarthritis, 18 presented with symptomatic metaphyseal debonding...
November 2017: Bone & Joint Journal
Madeleine Storey, Katherine Forde, Simon J Littlewood, Paul Scott, Friedy Luther, Jing Kang
Background: Retainer have the potential to compromise periodontal health. Objectives: Evaluate the periodontal health implications of upper and lower bonded retainers (BRs) versus upper and lower vacuum-formed retainers (VFRs) over 12 months. Trial design: Two-arm parallel group multicentre randomized controlled clinical trial. Methods: Sixty consecutive patients completing upper and lower fixed appliance therapy and requiring retainers were recruited from three hospital orthodontic departments...
October 20, 2017: European Journal of Orthodontics
Lik-Ho Tam, Cheuk Lun Chow, Denvid Lau
The epoxy-bonded system has been widely used in various applications across different length scales. Prior investigations have indicated that the moisture-affected interfacial debonding is the major failure mode of such system, but the fundamental mechanism remains unknown, such as the basis for the invasion of the water molecule in the cross-linked epoxy and the epoxy-bonded interface. This has prevented us from predicting the long-term performance of the epoxy-related applications related to the effect of the moisture...
October 23, 2017: Nanotechnology
X Callies, C Véchambre, C Fonteneau, F Herbst, J-M Chenal, S Pensec, L Chazeau, W H Binder, L Bouteiller, C Creton
We investigate the nanostructure, the rheology and the adhesion of soft supramolecular materials elaborated by blending monofunctional and multifunctional poly(isobutene) (PIB) chains. Monofunctional PIB chains (PIBUT) are linear and unentangled polymer chains (Mn ≈ 3 kg mol(-1)) functionalized in the middle by a bis-urea interacting moiety, able to self-associate by four hydrogen bonds. Covalent coupling of monofunctional PIB allows us to synthesize longer chains bearing two or three interacting moieties...
November 8, 2017: Soft Matter
Dalia Kaisarly, Moataz El Gezawi, Xiaohui Xu, Peter Rösch, Karl-Heinz Kunzelmann
Polymerization shrinkage of dental resin composites leads to stress build-up at the tooth-restoration interface that predisposes the restoration to debonding. In contrast to the heterogeneity of enamel and dentin, this study investigated the effect of boundary conditions in artificial cavity models such as ceramic and Teflon. Ceramic serves as a homogenous substrate that provides optimal bonding conditions, which we presented in the form of etched and silanized ceramic in addition to an etched, silanized and bonded ceramic cavity...
October 3, 2017: Journal of the Mechanical Behavior of Biomedical Materials
Steffen Stein, Andreas Hellak, Michael Schauseil, Heike Korbmacher-Steiner, Andreas Braun
OBJECTIVES: The aim of this study was to measure the effect of irradiation with a novel 445-nm diode laser on the shear bond strength (SBS) of ceramic brackets before debonding. MATERIALS AND METHODS: Thirty ceramic brackets (In-Ovation(®) C, GAC) were bonded in standard manner to the planed and polished buccal enamel surfaces of 30 caries-free human third molars. Each tooth was randomly allocated to the laser or control group, with 15 samples per group. The brackets in the laser group were irradiated with the diode laser (SIROLaser Blue(®); Sirona) on three sides of the bracket bases for 5 sec each (lateral-coronal-lateral, a total of 15 sec) immediately before debonding...
October 10, 2017: Photomedicine and Laser Surgery
Junyu Chen, He Cai, Xiaochun Ren, Lai Suo, Xibo Pei, Qianbing Wan
PURPOSE: The aim of this systematic review was to investigate the survival and complication rates of all-ceramic resin-bonded fixed dental prostheses (RBFDPs). MATERIALS AND METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were applied. A systematic search was conducted by an electronic search in PubMed, EMBASE, Cochrane Library, and CNKI databases complemented by a manual search. Only clinical studies on all-ceramic RBFDPs with a mean follow-up period of at least 3 years qualified for data analyses...
October 6, 2017: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
C J Soares, M S Ferreira, A A Bicalho, M de Paula Rodrigues, Ssl Braga, A Versluis
OBJECTIVES: To analyze the effect of pulp-capping materials and resin composite light activation on strain and temperature development in the pulp and on the interfacial integrity at the pulpal floor/pulp-capping materials in large molar class II cavities. METHODS: Forty extracted molars received large mesio-occlusal-distal (MOD) cavity bur preparation with 1.0 mm of dentin remaining at the pulp floor. Four pulp-capping materials (self-etching adhesive system, Clearfil SE Bond [CLE], Kuraray), two light-curing calcium hydroxide cements (BioCal [BIO], Biodinâmica, and Ultra-Blend Plus [ULT], Ultradent), and a resin-modified glass ionomer cement- (Vitrebond [VIT], 3M ESPE) were applied on the pulpal floor...
October 4, 2017: Operative Dentistry
Othman Al-Khudairi, Homayoun Hadavinia, Christian Little, Gavin Gillmore, Peter Greaves, Kirsten Dyer
In this paper, the sensitivity of the structural integrity of wind turbine blades to debonding of the shear web from the spar cap was investigated. In this regard, modal analysis, static and fatigue testing were performed on a 45.7 m blade for three states of the blade: (i) as received blade (ii) when a crack of 200 mm was introduced between the web and the spar cap and (iii) when the crack was extended to 1000 mm. Calibration pull-tests for all three states of the blade were performed to obtain the strain-bending moment relationship of the blade according to the estimated target bending moment (BM) which the blade is expected to experience in its service life...
October 3, 2017: Materials
Aswathy Kaimal, Poojya Ramdev, C S Shruthi
INTRODUCTION: Yttria stabilised tetragonal zirconia opens new vistas for all ceramic restoration by the mechanism of transformation toughening, making it much stronger compared to all other ceramic materials. Currently, it is the most recent core material for all ceramic fixed partial dentures due to its ability to withstand high simulated masticatory loads. Problems which have been reported with zirconia restorations involve the core cement interface leading to loss of retention of the prosthesis...
August 2017: Journal of Clinical and Diagnostic Research: JCDR
Piotr M Pieczywek, Artur Zdunek
A hybrid model based on a mass-spring system methodology coupled with the discrete element method (DEM) was implemented to simulate the deformation of cellular structures in 3D. Models of individual cells were constructed using the particles which cover the surfaces of cell walls and are interconnected in a triangle mesh network by viscoelastic springs. The spatial arrangement of the cells required to construct a virtual tissue was obtained using Poisson-disc sampling and Voronoi tessellation in 3D space. Three structural features were included in the model: viscoelastic material of cell walls, linearly elastic interior of the cells (simulating compressible liquid) and a gas phase in the intercellular spaces...
October 18, 2017: Soft Matter
Md Ashraful Islam, Jung Han Kim, Anthony Schropp, Hirokjyoti Kalita, Nitin Choudhary, Dylan Weitzman, Saiful I Khondaker, Kyu Hwan Oh, Tania Roy, Hee-Suk Chung, Yeonwoong Jung
Two-dimensional (2D) transition metal dichalcogenides (TMDs) such as molybdenum or tungsten disulfides (MoS2 or WS2) exhibit extremely large in-plane strain limits and unusual optical/electrical properties, offering unprecedented opportunities for flexible electronics/optoelectronics in new form factors. In order for them to be technologically viable building-blocks for such emerging technologies, it is critically demanded to grow/integrate them onto flexible or arbitrary-shaped substrates on a large wafer-scale compatible with the prevailing microelectronics processes...
October 11, 2017: Nano Letters
Ahmad R Mojdehi, Douglas P Holmes, David A Dillard
A generalized scaling law, based on the classical fracture mechanics approach, is developed to predict the bond strength of adhesive systems. The proposed scaling relationship depends on the rate of change of debond area with compliance, rather than the ratio of area to compliance. This distinction can have a profound impact on the expected bond strength of systems, particularly when the failure mechanism changes or the compliance of the load train increases. Based on the classical fracture mechanics approach for rate-independent materials, the load train compliance should not affect the force capacity of the adhesive system, whereas when the area to compliance ratio is used as the scaling parameter, it directly influences the bond strength, making it necessary to distinguish compliance contributions...
October 25, 2017: Soft Matter
Roya Naseh, Farnoosh Fallahzadeh, Mohammad Atai, Omid Mortezai, Raheleh Setayeshrad
BACKGROUND: The aim of study was to evaluate the application of casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and fluoride regarding their effect on the shear bond strength (SBS), bond failure pattern of brackets using the adhesive remnant index (ARI) and assessing the quality of enamel surface using the enamel damage index (EDI). MATERIAL AND METHODS: Sixty extracted premolar teeth were randomly divided into four groups regarding pretreatment application of CPP-ACP and fluoride...
August 2017: Journal of Clinical and Experimental Dentistry
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