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https://www.readbyqxmd.com/read/28717633/cementum-and-dentin-repair-following-root-damage-caused-by-the-insertion-of-self-tapping-and-self-drilling-miniscrews
#1
Majid Ghanbarzadeh, Farzin Heravi, Reihaneh Abrishamchi, Hooman Shafaee, Narges Ghazi, Parya Heravi, Hamid Ghanbarzadeh
OBJECTIVE: The aim of this study was to evaluate the histological responses of cementum, root dentin, and pulp following intentional root injuries caused via self-tapping and self-drilling miniscrews. MATERIALS AND METHODS: Fourteen patients (with a mean age of 15.7 years and age range of 14-18 years) who were scheduled for the extraction of all four first premolars as part of their orthodontic treatment plan participated in this study. The roots of the right and the left quadrants' first premolars were designedly injured using self-tapping miniscrews and self-drilling miniscrews, respectively...
July 2017: Journal of Orthodontic Science
https://www.readbyqxmd.com/read/28715679/a-parametric-study-on-hydraulic-conductivity-and-self-healing-properties-of-geotextile-clay-liners-used-in-landfills
#2
Fatemeh Parastar, Sayyed Mahdi Hejazi, Mohammad Sheikhzadeh, Azam Alirezazadeh
Nowadays, the raise of excessive generation of solid wastes is considered as a major environmental concern due to the fast global population growth. The contamination of groundwater from landfill leachate compromises every living creature. Geotextile clay liner (GCL) that has a sandwich structure with two fibrous sheets and a clay core can be considered as an engineered solution to prevent hazardous pollutants from entering into groundwater. The main objective of the present study is therefore to enhance the performance of GCL structures...
July 14, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28710388/beam-propagation-management-in-a-fractional-schr%C3%A3-dinger-equation
#3
Changming Huang, Liangwei Dong
Generalization of Fractional Schrödinger equation (FSE) into optics is fundamentally important, since optics usually provides a fertile ground where FSE-related phenomena can be effectively observed. Beam propagation management is a topic of considerable interest in the field of optics. Here, we put forward a simple scheme for the realization of propagation management of light beams by introducing a double-barrier potential into the FSE. Transmission, partial transmission/reflection, and total reflection of light fields can be controlled by varying the potential depth...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28709020/ruthenium-complexes-polypeptide-self-assembled-nanoparticles-for-identification-of-bacterial-infection-and-targeted-antibacterial-research
#4
Na Huang, Xu Chen, Xufeng Zhu, Mengmeng Xu, Jie Liu
Bacterial infection has been a threat to human health, and so early diagnosis and treatment of bacterial infection is an urgent problem that needs to be solved. In this work, a multifunctional theranostic selenium nanoplatform (Se@PEP-Ru NPs) with early imaging diagnosis and efficient treatment of bacterial infections was designed and constructed. First, the antibacterial peptide UBI29-41 (PEP) was linked to functionalized Selenium nanoparticles (NPs), which enhanced the stability of the antimicrobial peptide and also caused the nanocomposites to specifically target bacterial infection...
July 5, 2017: Biomaterials
https://www.readbyqxmd.com/read/28708918/the-influence-of-low-insertion-torque-on-primary-stability-implant-survival-and-maintenance-of-marginal-bone-levels-a-closed-cohort-prospective-study
#5
Michael R Norton
PURPOSE: The purpose of this study was to evaluate the impact of low insertion torque on primary stability and the short-term clinical outcome of single-tooth implants placed into healed ridges and fresh extraction sockets. MATERIALS AND METHODS: A cohort of n = 30 implants was self-selected on the basis that their insertion torque measured ≤ 20 Ncm. The cohort was closed with the follow-up set at 1 year. Resonance frequency analysis was evaluated in both mesiodistal (MD) and buccolingual (BL) directions at the time of implant insertion and at the time of restoration...
July 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28708376/self-healing-nano-textured-vascular-like-materials-mode-i-crack-propagation
#6
Minwook Lee, Soumyadip Sett, Seongpil An, Sam Sukgoo Yoon, Alexander L Yarin
Here we investigate crack propagation initiated from an initial notch in a self-healing material. The crack propagation in the core-shell nanofiber mats formed by co-electrospinning and the composites reinforced by them is in focus. All samples are observed from the crack initiation until complete failure. Due to the short-time experiments done on purpose, the resin and cure released from the cores of the core-shell nanofibers could not achieve a complete curing and stop crack growth, especially given the fact that no heating was used...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28707465/ultra-stretchable-and-self-healing-double-network-hydrogel-for-3d-printing-and-strain-sensor
#7
Sijun Liu, Lin Li
On the basis of the thermoreversible sol-gel transition behavior of κ-carrageenan in water, a double network (DN) hydrogel has been fabricated by combining an ionically crosslinked κ-carrageenan network with a covalently crosslinked polyacrylamide (PAAm) network. The κ-carrageenan/PAAm DN hydrogel demonstrated the excellent recoverability and significant self-healing capability (even when notched). More importantly, the warm pre-gel solution of κ-carrageenan/AAm is able to be used as an ink of a 3D printer to print complex 3D structures with remarkable mechanical strength after UV-exposure...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28702986/electromagnetic-field-in-control-tissue-regeneration-pelvic-pain-neuro-inflammation-and-modulation-of-non-neuronal-cells
#8
S E Aragona, G Mereghetti, G Gianazza, A Salsa, G Gianazza, J Lotti, A Vosa, T Lotti, E Canavesi
In scientific literature, magnetic fields are used both in basic science and clinical research. They are often used to treat pain and neuro-inflammation disorders thanks to their influence on cellular responses. Our project was born from the regenerative support that we wanted to give to those diseases characterized by neuro-inflammation, nerve lesion, muscles and tissues disorders that can transform the symptom (e.g. neuropathic pelvic pain) in disease. In this study, we examined the action of pulsed electromagnetic fields (PEMFs) on skin lesion regeneration and the repetitive trans-pelvic magnetic stimulation (rTPMS) on patients affected by incontinence and post-surgical problems, sexual dysfunction, and pelvic pain...
July 13, 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28701718/recycling-and-self-healing-of-polybenzoxazines-with-dynamic-sulfide-linkages
#9
Mustafa Arslan, Baris Kiskan, Yusuf Yagci
In this work, a recycling and self-healing strategy for polybenzoxazines through both S-S bond cleavage-reformation reaction and supramolecular attractions is described. Both recyclable and self-healable polybenzoxazines can be prepared from low cost chemicals with a simple procedure in only 30 minutes. For this purpose, inverse vulcanization of poly(propylene oxide)benzoxazine (PPOB) and diallybenzoxazine (B-al) with elemental sulfur was performed at 185 °C. The obtained cross-linked polymer films exhibited thermally driven recycling ability up to 5 cycles...
July 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28701043/in-situ-x-ray-tomography-study-of-cement-exposed-to-co2-saturated-brine
#10
Elvia Anabela Chavez Panduro, Malin Torsæter, Kamila Gawel, Ruben Bjørge, Alain Gibaud, Yi Yang, Stefan Bruns, Yi Zheng, Henning Osholm Sørensen, Dag W Breiby
For successful CO2 storage in underground reservoirs, the potential problem of CO2 leakage needs to be addressed. A profoundly improved understanding of the behavior of fractured cement under realistic subsurface conditions including elevated temperature, high pressure and the presence of CO2 saturated brine is required. Here, we report in-situ X-ray micro computed tomography (µ-CT) studies visualizing the micro-structural changes upon exposure of cured Portland cement with a leak path to CO2 saturated brine at high pressure...
July 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28696658/ultrasensitive-wearable-soft-strain-sensors-of-conductive-self-healing-and-elastic-hydrogels-with-synergistic-soft-and-hard-hybrid-networks
#11
Yan-Jun Liu, Wen-Tao Cao, Ming-Guo Ma, Pengbo Wan
Robust, stretchable and strain-sensitive hydrogels have recently attracted immense research interest due to their potential application in wearable strain sensors. The integration of the synergistic characteristics of decent mechanical properties, reliable self-healing capability, and high sensing sensitivity for fabricating conductive, elastic, self-healing, and strain-sensitive hydrogels is still a great challenge. Inspired by the mechanically excellent and self-healing biological soft tissues with hierarchical network structures, herein, functional network hydrogels are fabricated by the interconnection between a "soft" homogeneous polymer network and a "hard" dynamic ferric (Fe3+) cross-linked cellulose nanocrystals (CNCs-Fe(3+)) network...
July 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28691092/instant-tough-bonding-of-hydrogels-for-soft-machines-and-electronics
#12
Daniela Wirthl, Robert Pichler, Michael Drack, Gerald Kettlguber, Richard Moser, Robert Gerstmayr, Florian Hartmann, Elke Bradt, Rainer Kaltseis, Christian M Siket, Stefan E Schausberger, Sabine Hild, Siegfried Bauer, Martin Kaltenbrunner
Introducing methods for instant tough bonding between hydrogels and antagonistic materials-from soft to hard-allows us to demonstrate elastic yet tough biomimetic devices and machines with a high level of complexity. Tough hydrogels strongly attach, within seconds, to plastics, elastomers, leather, bone, and metals, reaching unprecedented interfacial toughness exceeding 2000 J/m(2). Healing of severed ionic hydrogel conductors becomes feasible and restores function instantly. Soft, transparent multilayered hybrids of elastomers and ionic hydrogels endure biaxial strain with more than 2000% increase in area, facilitating soft transducers, generators, and adaptive lenses...
June 2017: Science Advances
https://www.readbyqxmd.com/read/28690516/eruptive-seborrheic-keratoses-restricted-to-plaque-patch-stage-mycosis-fungoides
#13
Eve Lebas, Pascale Quatresooz, Jorge E Arrese, Arjen F Nikkels
Eruptive seborrheic keratoses (ESK) are rare in dermatology. They are usually inflammatory in nature and may be encountered as Leser-Trélat sign. ESK may also be simultaneously observed with hepatic angiomas, chemotherapy, segmental neurofibromatosis, HIV or erythrodermic pityriasis rubra pilaris, psoriasis, and drug eruption. ESK may be transient and self-healing. Others recede after successful treatment of the underlying disease. In some instances, seborrheic keratoses may follow an isotopic response and remain strictly restricted to sites of previous eczema, photo-exposition or tattoos...
May 2017: Case Reports in Dermatology
https://www.readbyqxmd.com/read/28686755/what-s-eating-you-chiggers
#14
Megan E Hohenberger, Dirk M Elston
Belonging to the Trombiculidae family of mites, chigger specifically refers to the larval stage of the mite's life cycle when it is able to bite its host. Although humans act as an accidental host, chiggers will latch on to the skin and their feeding process leads to localized inflammation and irritation. In most cases, these pruritic erythematous papules and papulovesicles are self-healing within a couple weeks, so only symptomatic relief is required as necessary by means of topical antipruritics, oral antihistamines, topical corticosteroids, or an intralesional triamcinolone acetonide injection in severe instances...
June 2017: Cutis; Cutaneous Medicine for the Practitioner
https://www.readbyqxmd.com/read/28683063/shear-thinning-and-self-healing-hydrogels-as-injectable-therapeutics-and-for-3d-printing
#15
Claudia Loebel, Christopher B Rodell, Minna H Chen, Jason A Burdick
The design of injectable hydrogel systems addresses the growing demand for minimally invasive approaches for local and sustained delivery of therapeutics. We developed a class of hyaluronic acid (HA) hydrogels that form through noncovalent guest-host interactions, undergo disassembly (shear-thinning) when injected through a syringe and then reassemble within seconds (self-healing) when shear forces are removed. Its unique properties enable the use of this hydrogel system for numerous applications, such as injection in vivo (including with cells and therapeutic molecules) or as a 'bioink' in 3D-printing applications...
August 2017: Nature Protocols
https://www.readbyqxmd.com/read/28681872/the-role-of-non-covalent-interactions-in-the-self-healing-mechanism-of-disulfide-based-polymers
#16
Elena Formoso, José M Asua, Jon M Matxain, Fernando Ruipérez
In this work, a theoretical protocol based on classical molecular dynamics has been defined, in order to study weak non-covalent interactions in diphenyl disulfide based compounds. This protocol is then used to study the influence of hydrogen bonds and π-π stacking in four selected cases, namely, monosubstituted and amine ortho trisubstituted urea and urethane-based diphenyl disulfides. In all cases, it has been observed that hydrogen bonds are much more relevant than π-π stacking, which has little influence...
July 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28679056/self-healing-dynamic-hydrogel-as-injectable-shock-absorbing-artificial-nucleus-pulposus
#17
Adrián Pérez-San Vicente, Marianna Peroglio, Manuela Ernst, Pablo Casuso, Iraida Loinaz, Hans-Jürgen Grande, Mauro Alini, David Eglin, Damien Dupin
The intervertebral discs (IVDs) provide unique flexibility to the spine and exceptional shock absorbing properties under impact. The inner core of the IVD, the nucleus pulposus (NP) is responsible for this adaptive behavior. Herein, we evaluate an injectable, self-healing dynamic hydrogel (DH) based on gold(I)-thiolate/disulfide (Au-S/SS) exchange as NP replacement in a spine motion segment model. For the first time, we report the application of dynamic covalent hydrogels inside biological tissues. The dynamic exchange between Au-S species and disulfide bonds (SS) resulted in self-healing ability and frequency-dependent stiffness of the hydrogel, which was also confirmed in spine motion segments...
July 19, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28678920/pain-and-distress-outcomes-in-infants-and-children-a-systematic-review
#18
N C A C Oliveira, C M Gaspardo, M B M Linhares
The aim of the present study was to systematically review the recent literature about pain and distress outcomes in children and critically analyze the methodological quality of the reports. The systematic review was based on the PRISMA statement and performed by selecting articles that are indexed in scientific databases. The methodological quality of reports was examined using STROBE statement, for observational studies, and CONSORT statement, for randomized controlled trials. The PedIMMPACT consensus was used to evaluate the psychometric quality of pain instruments...
July 3, 2017: Brazilian Journal of Medical and Biological Research, Revista Brasileira de Pesquisas Médicas e Biológicas
https://www.readbyqxmd.com/read/28677394/dynamic-softening-or-stiffening-a-supramolecular-hydrogel-by-ultraviolet-or-near-infrared-light
#19
Zhao Zheng, Jingjing Hu, Hui Wang, Junlin Huang, Yihua Yu, Qiang Zhang, Yiyun Cheng
The development of light-responsive hydrogels that exhibit switchable size and mechanical properties with temporal and spatial resolution is of great importance in many fields. However, it remains challenging to prepare smart hydrogels that dramatically change their properties in response to both ultraviolet (UV) and near-infrared (NIR) lights. Here, we designed a dual-light responsive supramolecular gel by integrating UV light-switchable host-guest recognition, temperature responsiveness, and NIR photothermal ability in the gel...
July 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28677259/self-healable-organogel-nanocomposite-with-angle-independent-structural-colors
#20
Jinming Zhou, Peng Han, Meijin Liu, Haiyan Zhou, Yingxue Zhang, Jieke Jiang, Peng Liu, Yu Wei, Yanlin Song, Xi Yao
The fascinating structural colors have profound implications in fields of pigments, displays and sensors, but none of the current non-iridescent photonic materials could restore functions from mechanical damages. Herein, we report the first development of self-healable organogel nanocomposites possessing angle-independent structural colors. The organogel nanocomposites were prepared through the co-assembly of oleophilic silica nanoparticles, silicone based supramolecular gel and carbon black. The organogel system enables amorphous aggregation of silica nanoparticles and the angle-independent structural colors in the nanocomposites...
July 4, 2017: Angewandte Chemie
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