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https://www.readbyqxmd.com/read/28228165/determining-optimal-fluorescent-agent-concentrations-in-dental-adhesive-resins-for-imaging-the-tooth-restoration-interface
#1
Odair Bim Júnior, Marco A Cebim, Maria T Atta, Camila M Machado, Luciana F Francisconi-Dos-Rios, Linda Wang
Fluorescent dyes like Rhodamine B (RB) have been used to identify the spatial distribution of adhesive restorative materials in the tooth/restoration interface. Potential effects of the addition of RB to dental adhesives were addressed in the past, but no further information is available on how to determine suitable concentrations of RB in these bonding agents for imaging in the confocal laser scanning microscope. This study provides systematical strategies for adding RB to viscous dental adhesive resins, focusing on the determination of the lowest range of dye concentrations necessary to achieve an acceptable image of the dentin/adhesive interface...
February 2017: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/28227182/strategies-to-improve-stimulation-efficiency-for-retinal-prostheses
#2
Navya S Davuluri, Kiran Nimmagadda, Artin Petrossians, Mark S Humayun, James D Weiland, Navya S Davuluri, Kiran Nimmagadda, Artin Petrossians, Mark S Humayun, James D Weiland, Mark S Humayun, Kiran Nimmagadda, Navya S Davuluri, James D Weiland, Artin Petrossians
Retinitis Pigmentosa (RP) is a degenerative disease of the retina that leads to vision loss. Retinal prostheses are being developed in order to restore functional vision in patients suffering from RP. We conducted in-vivo experiments in order to identify strategies to efficiently stimulate the retina. We electrically stimulated the retina and measured electrically evoked potentials (EERs) from the superior colliculus of rats. We compared the strength of EERs when voltage-controlled and current-controlled pulses of varying pulse width and charge levels were applied to the retina...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226370/osseous-and-cartilaginous-nasal-reconstruction
#3
Samuel Hahn
The nose is a complex, three-dimensional structure that is supported by a framework of osseous and cartilaginous structures. Disruption of this framework can result in nasal deformity and functional deficits. Nasal reconstruction requires restoration of the osseous and cartilaginous framework. This requires careful preoperative assessment of the nasal defect and understanding the nasal and facial aesthetics that are supported by the osseous and cartilaginous support structures. Structural grafts can be classified as restorative, supportive, or contouring...
February 2017: Facial Plastic Surgery: FPS
https://www.readbyqxmd.com/read/28223209/langmuir-schaefer-film-deposition-onto-honeycomb-porous-films-for-retinal-tissue-engineering
#4
Maria Teresa Calejo, Tanja Ilmarinen, Elina Vuorimaa-Laukkanen, Elina Talvitie, Hanna M Hakola, Heli Skottman, Minna Kellomäki
: Age-related macular degeneration (AMD) is the leading cause of vision loss in senior citizens in the developed world. The disease is characterised by the degeneration of a specific cell layer at the back of the eye - the retinal pigment epithelium (RPE), which is essential in retinal function. The most promising therapeutic option to restore the lost vision is considered to be RPE cell transplantation. This work focuses on the development of biodegradable biomaterials with similar properties to the native Bruch's membrane as carriers for RPE cells...
February 18, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28222907/fatigue-testing-of-biomaterials-and-their-interfaces
#5
Dwayne Arola
OBJECTIVE: The objective of this article is to describe the importance of fatigue to the success of restorative dentistry, with emphasis on the methods for evaluating the fatigue properties of materials in this field, and the durability of their bonded interfaces. METHODS: The stress-life fatigue and fatigue crack growth approaches for evaluating the fatigue resistance of dental biomaterials are introduced. Emphasis is placed on in vitro studies of the hard tissue foundation, restorative materials and their bonded interfaces...
February 17, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28222866/shear-bond-strength-of-zirconia-based-ceramics-veneered-with-2-different-techniques
#6
Ahmed M Zaher, J L Hochstedler, Frederick A Rueggeberg, Edwin L Kee
STATEMENT OF PROBLEM: Delamination of veneering ceramic is reported as one of the most frequent problems associated with veneered zirconia restorations. PURPOSE: The purpose of this in vitro study was to compare the shear bond strength of sintered lithium disilicate to that of pressed fluorapatite glass-ceramic on a zirconia substrate. MATERIAL AND METHODS: Thirty zirconia blocks (20×15×2.5-mm thick) were cut, sintered, and divided into 2 groups...
February 17, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28222209/effect-of-different-intermediary-bases-on-microleakage-of-a-restorative-material-in-class-ii-box-cavities-of-primary-teeth
#7
Faika Y Abdelmegid, Fouad S Salama, Waleed M Al-Mutairi, Saud K Al-Mutairi, Sultan O Baghazal
INTRODUCTION: The aim of this in vitro study was to assess and compare the effect of different intermediary bases on microleakage between tooth and a nanocomposite interface in Class II box cavities in primary teeth. METHODS: Standard Class II box cavities were prepared in 52 primary molars and randomly divided into 9 groups according to the intermediary base used (Multicore Flow, Fuji II LC, SDR, Smart Dentin Replacement, and Biodentine). All specimens were subjected to thermocycling and prepared for microleakage testing and evaluation...
February 21, 2017: International Journal of Artificial Organs
https://www.readbyqxmd.com/read/28220995/development-of-hydrogels-for-regenerative-engineering
#8
REVIEW
Xiaofei Guan, Meltem Avci-Adali, Emine Alarçin, Hao Cheng, Sara Saheb Kashaf, Yuxiao Li, Aditya Chawla, Hae Lin Jang, Ali Khademhosseini
The aim of regenerative engineering is to restore complex tissues and biological systems through convergence in the fields of advanced biomaterials, stem cell science, and developmental biology. Hydrogels are one of the most attractive biomaterials for regenerative engineering, since they can be engineered into tissue mimetic 3D scaffolds to support cell growth due to their similarity to native extracellular matrix. Advanced nano- and micro-technologies have dramatically increased the ability to control properties and functionalities of hydrogel materials by facilitating biomimetic fabrication of more sophisticated compositions and architectures, thus extending our understanding of cell-matrix interactions at the nanoscale...
February 21, 2017: Biotechnology Journal
https://www.readbyqxmd.com/read/28220514/randomised-clinical-trial-faecal-microbiota-transplantation-for-recurrent-clostridum-difficile-infection-fresh-or-frozen-or-lyophilised-microbiota-from-a-small-pool-of-healthy-donors-delivered-by-colonoscopy
#9
Z D Jiang, N J Ajami, J F Petrosino, G Jun, C L Hanis, M Shah, L Hochman, V Ankoma-Sey, A W DuPont, M C Wong, A Alexander, S Ke, H L DuPont
BACKGROUND: Faecal microbiota transplantation (FMT) has become routine in managing recurrent C. difficile infection (CDI) refractory to antibiotics. AIM: To compare clinical response and improvements in colonic microbiota diversity in subjects with recurrent CDI using different donor product. METHODS: Seventy-two subjects with ≥3 bouts of CDI were randomised in a double-blind study to receive fresh, frozen or lyophilised FMT product via colonoscopy from 50 g of stool per treatment from eight healthy donors...
February 21, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28220366/zirconia-implants-and-peek-restorations-for-the-replacement-of-upper-molars
#10
José María Parmigiani-Izquierdo, María Eugenia Cabaña-Muñoz, José Joaquín Merino, Arturo Sánchez-Pérez
BACKGROUND: One of the disadvantages of the zirconia implants is the lack of elasticity, which is increased with the use of ceramic or zirconia crowns. The consequences that could result from this lack of elasticity have led to the search for new materials with improved mechanical properties. CASE PRESENTATION: A patient who is a 45-year-old woman, non-smoker and has no medical record of interest with a longitudinal fracture in the palatal root of molar tooth 1...
December 2017: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/28219093/-impact-of-vitamin-d-in-sports-does-vitamin-d-insufficiency-compromise-athletic-performance
#11
Sebastian Butscheidt, Tim Rolvien, Peter Ueblacker, Michael Amling, Florian Barvencik
: Introduction Vitamin D is essential for calcium homeostasis and regulates the expression of over 900 genes. It thereby influences musculoskeletal health and function. Additionally, multiple other effects were observed through the detection of vitamin D receptors (VDR) in numerous tissues of the human body. Material and Methods We reviewed the literature regarding evidence of the impact of vitamin D on musculoskeletal health and peak athletic performance. Results and Discussion It is well known that there is a high prevalence of vitamin D deficiency in the average European population...
February 20, 2017: Sportverletzung Sportschaden: Organ der Gesellschaft Für Orthopädisch-Traumatologische Sportmedizin
https://www.readbyqxmd.com/read/28218454/phase-separation-derived-core-shell-structured-cu11-v6-o26-v2-o5-microspheres-first-synthesis-and-excellent-lithium-ion-anode-performance-with-outstanding-capacity-self-restoration
#12
Jian Pei, Gang Chen, Qiang Zhang, Changfeng Bie, Jingxue Sun
Novel amorphous vanadium oxide coated copper vanadium oxide (Cu11 V6 O26 /V2 O5 ) microspheres with 3D hierarchical architecture have been successfully prepared via a microwave-assisted solution method and subsequent annealing induced phase separation process. Pure Cu11 V6 O26 microspheres without V2 O5 coating are also obtained by an H2 O2 solution dissolving treatment. When evaluated as an anode material for lithium-ion batteries (LIBs), the as-synthesized hybrid exhibits large reversible capacity, excellent rate capability, and outstanding capacity self-recovery...
February 20, 2017: Small
https://www.readbyqxmd.com/read/28217840/a-comparison-of-us-and-japanese-dental-restorative-care-present-on-service-members-recovered-from-the-wwii-era
#13
Calvin Y Shiroma
The documentation of dental materials used in the USA during the WWII era is readily available, while references for the Japanese are minimal. It was therefore important to build a photographic database of Japanese restorative care which could be utilized as a comparison tool for the deployed odontologist. The dental restorative care of approximately 400 US and 100 Japanese sets of remains was evaluated. Both countries share many similar restorative techniques to include collared crowns, full-coverage restorations, cantilever bridge/pontics to close spaces; restorative materials such as amalgam, gold, and zinc phosphate (temporary) restorations; and removable prostheses...
February 20, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28216848/clinical-outcome-of-tooth-supported-fixed-partial-dentures-in-unilateral-cleft-lip-and-palate-patients-a-case-series
#14
Sudhir Bhandari
INTRODUCTION: Cleft lip and palate (CLP) is the most frequent congenital facial abnormality and multidisciplinary treatment extending over many years is necessary to rehabilitate the affected individuals to normal function and esthetics. OBJECTIVE: To evaluate the clinical treatment outcome for missing teeth with tooth supported fixed partial dentures in unilateral cleft lip and palate patients. PATIENTS AND METHODS: Tooth supported fixed partial denture (T-FPD) was utilized for restoration of missing teeth in the cleft area for 9 non syndromic, unilateral cleft lip and palate patients (U-CLP)...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216846/three-dimensional-finite-element-analysis-of-the-stress-distribution-pattern-in-a-mandibular-first-molar-tooth-restored-with-five-different-restorative-materials
#15
Kathleen Manuela D'souza, Meena Ajay Aras
INTRODUCTION: Badly broken or structurally compromised posterior teeth are frequently associated with crown/root fracture. Numerous restorative materials have been used to fabricate indirect full-coverage restorations for such teeth. This study aims to evaluate and compare the effect of restorative materials on the stress distribution pattern in a mandibular first molar tooth, under varying loading conditions and to compare the stress distribution pattern in five commonly used indirect restorative materials...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28216839/a-study-on-the-wear-of-enamel-caused-by-monolithic-zirconia-and-the-subsequent-phase-transformation-compared-to-two-other-ceramic-systems
#16
Amreen Rupawala, Smita I Musani, Pallavi Madanshetty, Ramandeep Dugal, Umang D Shah, Ektaa J Sheth
PURPOSE: The purpose of this in vitro research project was to evaluate and compare the wear behavior of human tooth enamel opposing monolithic zirconia and other different ceramic restorative materials and also to observe the tetragonal to monoclinic phase transformation in zirconia-based ceramics that may occur while simulating wear occurring at room temperature in a wet environment. MATERIALS AND METHODS: A total of sixty samples were prepared for this study. Fifteen discs of glazed zirconia, 15 discs of polished zirconia without glaze, 15 discs of metal ceramic, and 15 discs of lithium disilicate were fabricated...
January 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28214537/biomechanical-behavior-of-endodontically-treated-premolars-using-different-preparation-designs-and-cad-cam-materials
#17
Diogo Pedrollo Lise, Annelies Van Ende, Jan De Munck, Thaís Yumi Umeda Suzuki, Luiz Clovis Cardoso Vieira, Bart Van Meerbeek
OBJECTIVES: To evaluate the effect of restoration design ('2.5-mm deep endocrown', '5-mm deep endocrown' or '5-mm deep post&crown') and CAD/CAM material type (composite or lithium disilicate glass-ceramic) on the load-to-failure of endodontically treated premolars in absence of any ferrule. METHODS: The crowns of 48 single-rooted premolars were cut and the roots were endodontically treated. Teeth were randomly divided into six groups (n=8); teeth in each group were restored using one of the two tested materials with standardized CAD/CAM fabricated endocrowns (with either 2...
February 15, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28213184/forensic-applications-fluorescence-properties-of-tooth-coloured-restorative-materials-using-a-fluorescence-dslr-camera
#18
Ramya Kiran, James Chapman, Alexander Forrest, Marc Tennant, Laurence J Walsh
The objective of this study was to compare the fluorescence properties of dry and wet samples of contemporary tooth-coloured restorative materials using a fluorescence based DSLR camera and a variety of LEDs emitting different wavelengths of visible light as excitation sources. The materials examined included resin composites; ceramics and hybrid restorative materials such as ormocers, Vita Enamic™ and resin reinforced glass-ionomer cements. The levels of fluorescence for each sample under different combinations of incident light wavelengths and filters was analysed by using histogram data for colour channels from Adobe Photoshop software...
February 3, 2017: Forensic Science International
https://www.readbyqxmd.com/read/28212980/biofilm-formation-and-release-of-fluoride-from-dental-restorative-materials-in-relation-to-their-surface-properties
#19
Sebastian Hahnel, Andrei C Ionescu, Gloria Cazzaniga, Marco Ottobelli, Eugenio Brambilla
OBJECTIVES: To elucidate the impact of surface properties and the release of fluoride from different glass ionomer cements on biofilm formation. METHODS: Standardized specimens manufactured from various classes of glass ionomer cements (GICs), a resin-based composite (RBC), and human enamel were subjected to surface analyses. Subsequent to simulation of salivary pellicle formation, Streptococcus mutans biofilm formation was initiated using a drip flow reactor for 48h and 96h...
February 14, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28212979/degradation-of-optical-and-surface-properties-of-resin-based-composites-with-distinct-nanoparticle-sizes-but-equivalent-surface-area
#20
Vinícius Esteves Salgado, Larissa Maria Cavalcante, Rafael R Moraes, Harry B Davis, Jack L Ferracane, Luis Felipe Schneider
OBJECTIVE: To determine the optical and surface properties of model resin-based composites made with distinct nanoparticle sizes but equalized surface area, among them, before and after ageing. METHODS: Model resin-based composites based on BisGMA/TEGDMA (50:50mol%) were loaded with three different fumed silica filler content (7nm/examethyldisilazane, 12nm/octylsilane, and 16nm/dimethylchlorosilane), but with equivalent surface area (BET method). The optical and surface properties of the disk-shaped specimens were measured in 24h after photoactivation (baseline) and repeated after water storage (90days at 37°C), and after abrasion (20,000 cycles of brushing)...
February 14, 2017: Journal of Dentistry
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