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https://www.readbyqxmd.com/read/27911882/a-unified-perspective-of-complex-band-structure-interpretations-formulations-and-applications
#1
Matthew G Reuter
Complex band structure generalizes conventional band structure by also considering wavevectors with complex components. In this way, complex band structure describes both the bulk-propagating states from conventional band structure and the evanescent states that grow or decay from one unit cell to the next. Even though these latter states are excluded by translational symmetry, they become important when translational symmetry is broken via, for example, a surface or impurity. Many studies over the last 80 years have directly or indirectly developed complex band structure for an impressive range of applications, but very few discuss its fundamentals or compare its various results...
December 2, 2016: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/27902718/metal-sounds-stiffer-than-drums-for-ears-but-not-always-for-hands-low-level-auditory-features-affect-multisensory-stiffness-perception-more-than-high-level-categorical-information
#2
Juan Liu, Hiroshi Ando
Most real-world events stimulate multiple sensory modalities simultaneously. Usually, the stiffness of an object is perceived haptically. However, auditory signals also contain stiffness-related information, and people can form impressions of stiffness from the different impact sounds of metal, wood, or glass. To understand whether there is any interaction between auditory and haptic stiffness perception, and if so, whether the inferred material category is the most relevant auditory information, we conducted experiments using a force-feedback device and the modal synthesis method to present haptic stimuli and impact sound in accordance with participants' actions, and to modulate low-level acoustic parameters, i...
2016: PloS One
https://www.readbyqxmd.com/read/27895002/impression-material-in-the-external-and-middle-ear-an-overview-of-the-literature-and-a-stepwise-approach-for-removal
#3
Froukje Verdam, Rinze Tange, Hans Thomeer
Here, we provide a literature overview of cases with protruding molding material for earplugs or hearing aids and subsequent required treatment, including our own cases. Patients at risk are those with impaired tympanic membranes or who previously underwent otologic surgery. Symptoms such as otalgia, tinnitus, and vertigo are alarming but do not always arise. In case of doubt, a CT scan is of additive value to prepare for adequate surgical removal and to limit potential damage. A stepwise approach for the clinician on how to address these challenging cases is presented, based upon the literature and our own experience...
November 28, 2016: Journal of International Advanced Otology
https://www.readbyqxmd.com/read/27889076/impression-technique-for-a-complete-arch-prosthesis-with-multiple-implants-using-additive-manufacturing-technologies
#4
Marta Revilla-León, José Luis Sánchez-Rubio, Jesús Oteo-Calatayud, Mutlu Özcan
This article describes an impression technique for a complete-arch prosthesis supported by multiple implants where additive manufacturing technologies were used to fabricate a splinting framework and a custom tray. The technique presented uses a shim method to control the homogenous splinting acrylic resin and impression material during the procedure, thereby reducing laboratory and chairside time and the number of impression copings and laboratory analogs needed.
November 23, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27886326/molecular-dynamics-simulation-of-amino-acid-ionic-liquids-near-a-graphene-electrode-effects-of-alkyl-side-chain-length
#5
Behnoosh Sadeghi Moghadam, Mohammad Razmkhah, Mohammad Taghi Hamed Mosavian, Fatemeh Moosavi
Electric double layer (EDL) supercapacitors, using ionic liquid electrolytes, have been receiving a great deal of attention in response to the growing demand for energy storage systems. In the present study, the nanoscopic structure of amino acid ionic liquids (AAILs) as biodegradable electrolytes near a neutral graphene surface was studied by molecular dynamics (MD) simulation. In order to explore the influence of the anion type and structure, the effect of the alkyl side-chain length of amino acids on the EDL was investigated...
November 25, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27886066/importance-of-heat-and-pressure-for-solubilization-of-recombinant-spider-silk-proteins-in-aqueous-solution
#6
Justin A Jones, Thomas I Harris, Paula F Oliveira, Brianne E Bell, Abdulrahman Alhabib, Randolph V Lewis
The production of recombinant spider silk proteins continues to be a key area of interest for a number of research groups. Several key obstacles exist in their production as well as in their formulation into useable products. The original reported method to solubilize recombinant spider silk proteins (rSSp) in an aqueous solution involved using microwaves to quickly generate heat and pressure inside of a sealed vial containing rSSp and water. Fibers produced from this system are remarkable in their mechanical ability and demonstrate the ability to be stretched and recover 100 times...
November 23, 2016: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/27881327/accuracy-of-impression-scanning-compared-with-stone-casts-of-implant-impressions
#7
Ragai Edward Matta, Werner Adler, Manfred Wichmann, Siegfried Martin Heckmann
STATEMENT OF PROBLEM: Accurate virtual implant models are a necessity for the fabrication of precisely fitting superstructures. PURPOSE: The purpose of this in vitro study was to evaluate different methods with which to build an accurate virtual model of a 3-dimensional implant in the oral cavity; this model would then be used for iterative computer-aided design and computer-aided manufacturing (CAD-CAM) procedures. MATERIAL AND METHODS: A titanium master model with 3 rigidly connected implants was manufactured and digitized with a noncontact industrial scanner to obtain a virtual master model...
October 27, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27881318/clinical-characteristics-of-an-allergic-reaction-to-a-polyether-dental-impression-material
#8
Caroline Freitas Rafael, Anja Liebermann
Allergic and hypersensitivity reactions to dental impression materials may occur throughout dental treatment, with diverse manifestations from slight redness to severe pain and a burning mouth with total stomatitis. Patients are often unaware of these allergic reactions, which makes early identification of the cause almost impossible. In addition, symptoms usually begin after 24 hours and mostly in patients with a preexisting history of allergic responses. This report describes a patient with a suspected allergic reaction to a polyether dental impression material during prosthetic rehabilitation associated with a mandibular telescopic denture...
October 27, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27874132/cubic-mesoporous-ag-cn-a-high-performance-humidity-sensor
#9
Vijay K Tomer, Nishanthi Thangaraj, Sweta Gahlot, Kamalakannan Kailasam
The fabrication of highly responsive, rapid response/recovery and durable relative humidity (%RH) sensors that can precisely monitor humidity levels still remains a considerable challenge for realizing the next generation humidity sensing applications. Herein, we report a remarkably sensitive and rapid %RH sensor having a reversible response using a nanocasting route for synthesizing mesoporous g-CN (commonly known as g-C3N4). The 3D replicated cubic mesostructure provides a high surface area thereby increasing the adsorption, transmission of charge carriers and desorption of water molecules across the sensor surfaces...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27870923/covering-the-implant-prosthesis-screw-access-hole-a-biological-approach-to-material-selection-and-technique
#10
Todd Schoenbaum, Chandur Wadhwani, Richard Stevenson
The traditional material for covering the implant abutment screw is cotton. As the implant-abutment junction flexes and wears overtime, leakage from the oral environment penetrates into the screw access chamber where the cotton pellet is located. The cotton serves as a scaffolding for the proliferation of anaerobic bacteria in the warm, oxygen free environment. The bacterial exudate causes foul odors and may cause additional inflammation of the peri-implant tissues. The use of PTFE tape or PVS impression material serves the same role as the cotton pellet, but forms a better seal and limits bacterial growth inside the implant and abutment...
November 21, 2016: Journal of Oral Implantology
https://www.readbyqxmd.com/read/27869175/an-antibacterial-and-absorbable-silk-based-fixation-material-with-impressive-mechanical-properties-and-biocompatibility
#11
Chenglong Shi, Xiaobing Pu, Guan Zheng, Xinglong Feng, Xuan Yang, Baoliang Zhang, Yu Zhang, Qingshui Yin, Hong Xia
Implant-associated infections and non-absorbing materials are two important reasons for a second surgical procedure to remove internal fixation devices after an orthopedic internal fixation surgery. The objective of this study was to produce an antibacterial and absorbable fixation screw by adding gentamicin to silk-based materials. The antibacterial activity was assessed against Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) in vitro by plate cultivation and scanning electron microscopy (SEM)...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27863856/accuracy-of-intraoral-digital-impressions-using-an-artificial%C3%A2-landmark
#12
Jong-Eun Kim, Ami Amelya, Yooseok Shin, June-Sung Shim
STATEMENT OF PROBLEM: Intraoral scanners have been reported to have limited accuracy in edentulous areas. Large amounts of mobile tissue and the lack of obvious anatomic landmarks make it difficult to acquire a precise digital impression of an edentulous area with an intraoral scanner. PURPOSE: The purpose of this in vitro study was to determine the effect of an artificial landmark on a long edentulous space on the accuracy outcomes of intraoral digital impressions...
November 15, 2016: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/27852764/the-mechanics-of-head-supported-load-carriage-by-nepalese-porters
#13
G J Bastien, P A Willems, B Schepens, N C Heglund
In the Everest valley of Nepal, because of the rugged mountain terrain, roads are nothing more than dirt paths and all material must be conveyed on foot. The Nepalese porters routinely carry head-supported loads, which often exceed their body mass, over long distances up and down the steep mountain footpaths. In Africa, women transport their loads economically thanks to an energy-saving gait adaptation. We hypothesized that the Nepalese porters may have developed a corresponding mechanism. To investigate this proposition, we measured the mechanical work done during level walking in Nepalese porters while carrying different loads at several speeds...
November 15, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27847400/simplified-prosthetic-rehabilitation-of-a-patient-after-oral-cancer-removal
#14
Josip Kranjčić, Nikola Džakula, Denis Vojvodić
The treatment of patients with oral cancer is complex: a multidisciplinary approach needs to be taken and maxillofacial and oral surgeons, an oncologist, a prosthodontist should be included, and a psychologist is often needed. This case report describes the prosthetic rehabilitation of a patient after surgical removal of oral cancer with obturator prosthesis. Resection cavity was located in central part of the hard palate and the condition belonged to Aramany class 3 maxillary defects. The two-step impression technique of denture bearing area was used and the resection of cavity was performed...
September 2016: Acta Stomatologica Croatica
https://www.readbyqxmd.com/read/27843654/anterior-pituitary-aplasia-in-an-infant-with-ring-chromosome-18p-deletion
#15
Edward J Bellfield, Jacqueline Chan, Sarah Durrin, Valerie Lindgren, Zohra Shad, Claudia Boucher-Berry
We present the first reported case of an infant with 18p deletion syndrome with anterior pituitary aplasia secondary to a ring chromosome. Endocrine workup soon after birth was reassuring; however, repeat testing months later confirmed central hypopituitarism. While MRI reading initially indicated no midline defects, subsequent review of the images confirmed anterior pituitary aplasia with ectopic posterior pituitary. This case demonstrates how deletion of genetic material, even if resulting in a chromosomal ring, still results in a severe syndromic phenotype...
2016: Case Reports in Endocrinology
https://www.readbyqxmd.com/read/27829736/quick-painless-and-atraumatic-gingival-retraction-an-overview-of-advanced-materials
#16
REVIEW
M Aarti Rajambigai, S Ramesh Raja, S I Joephin Soundar, M Kandasamy
The success of any fixed prosthesis depends on the accuracy of impressions. Finish line exposure has to be adequate during impression making. The goal of gingival retraction is to atraumatically displace gingival tissues to allow access for impression material to record the finish line and provide sufficient thickness of gingival sulcus so that the impression does not tear off during removal. Numerous advanced materials are available for gingival retraction. This article describes the different advanced materials available...
October 2016: Journal of Pharmacy & Bioallied Sciences
https://www.readbyqxmd.com/read/27826388/investigation-of-the-effects-of-storage-time-on-the-dimensional-accuracy-of-impression-materials-using-cone-beam-computed-tomography
#17
Murat Alkurt, Zeynep Yeşıl Duymus, Numan Dedeoglu
PURPOSE: The storage conditions of impressions affect the dimensional accuracy of the impression materials. The aim of the study was to assess the effects of storage time on dimensional accuracy of five different impression materials by cone beam computed tomography (CBCT). MATERIALS AND METHODS: Polyether (Impregum), hydrocolloid (Hydrogum and Alginoplast), and silicone (Zetaflow and Honigum) impression materials were used for impressions taken from an acrylic master model...
October 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/27826387/empirical-study-of-alginate-impression-materials-by-customized-proportioning-system
#18
Karani Kurtulus, Kenan Tüfekci
PURPOSE: Alginate mixers available in the market do not have the automatic proportioning unit. In this study, an automatic proportioning unit for the alginate mixer and controller software were designed and produced for a new automatic proportioning unit. With this device, it was ensured that proportioning operation could arrange weight-based alginate impression materials. MATERIALS AND METHODS: The variation of coefficient in the tested groups was compared with the manual proportioning...
October 2016: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/27820812/graded-bandgap-perovskite-solar-cells
#19
Onur Ergen, S Matt Gilbert, Thang Pham, Sally J Turner, Mark Tian Zhi Tan, Marcus A Worsley, Alex Zettl
Organic-inorganic halide perovskite materials have emerged as attractive alternatives to conventional solar cell building blocks. Their high light absorption coefficients and long diffusion lengths suggest high power conversion efficiencies, and indeed perovskite-based single bandgap and tandem solar cell designs have yielded impressive performances. One approach to further enhance solar spectrum utilization is the graded bandgap, but this has not been previously achieved for perovskites. In this study, we demonstrate graded bandgap perovskite solar cells with steady-state conversion efficiencies averaging 18...
November 7, 2016: Nature Materials
https://www.readbyqxmd.com/read/27812498/an-unusual-case-of-chronic-cough-professional-liability-in-dentistry
#20
Matteo Bolcato, Anna Aprile, Luciana Caenazzo, Daniele Rodriguez, Pamela Tozzo
Foreign body aspiration (FBA) is a serious medical problem, also in dental practice. The case report describes the case of a patient who for 12 years has suffered from chronic cough as a result of the aspiration of a polymeric silicone resin fragment during a dental procedure. In November 2002, the patient was underwent dental care, and she points out that, when performing dental imprint, she had sensed that something "went down in the throat" but she was immediately reassured by the dentist. After lung CT was performed, the foreign body was identified and removed with benefit to the patient...
2016: Respiratory Medicine Case Reports
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