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https://www.readbyqxmd.com/read/29029722/the-first-virus-hunters
#1
Thomas C Mettenleiter
The history of virology is a history of conceptual and technological inventions and breakthroughs. The development of filters made of porcelain or kieselgur by the end of the 19th century which withheld bacteria allowed the identification of infectious agents smaller than bacteria and noncultivable on the media known at that time and used to grow bacteria. Even finer-grain filters resulted in the observation that the ultravisible novel infectious agents are in fact of particulate nature. Infections of plants and animals were the first to be attributed to these tiny entities...
2017: Advances in Virus Research
https://www.readbyqxmd.com/read/29028598/a-particle-swarm-based-algorithm-for-optimization-of-multi-layered-and-graded-dental-ceramics
#2
Ehsan Askari, Paulo Flores, Filipe Silva
The thermal residual stresses (TRSs) generated owing to the cooling down from the processing temperature in layered ceramic systems can lead to crack formation as well as influence the bending stress distribution and the strength of the structure. The purpose of this study is to minimize the thermal residual and bending stresses in dental ceramics to enhance their strength as well as to prevent the structure failure. Analytical parametric models are developed to evaluate thermal residual stresses in zirconia-porcelain multi-layered and graded discs and to simulate the piston-on-ring test...
October 4, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28994683/sutureless-aortic-valve-implantation-in-patient-with-porcelain-aorta-via-unclamped-aorta-and-deep-hypothermic-circulatory-arrest
#3
Vagelis Boultadakis, Nikolaos G Baikoussis, Victoras Panagiotakopoulos, Nikolaos A Papakonstantinou, Polyxeni Xelidoni, Stratos Anagnostou, Christos Charitos
Severe atherosclerotic calcification of the ascending aorta, the so-called porcelain aorta, precludes cardiac surgeons from placing an aortic cross-clamp and direct aortic cannulation due to the increased risk of systemic embolism and stroke. In the present report, we support the option of sutureless valve implantation in a case of a porcelain ascending aorta, with deep hypothermic circulatory arrest and also without aortic cross-clamp.
October 2017: Annals of Cardiac Anaesthesia
https://www.readbyqxmd.com/read/28977778/novel-translucent-and-strong-submicron-alumina-ceramics-for-dental-restorations
#4
M Zhao, Y Sun, J Zhang, Y Zhang
An ideal ceramic restorative material should possess excellent aesthetic and mechanical properties. We hypothesize that the high translucency and strength of polycrystalline ceramics can be achieved through microstructural tailoring. The aim of this study is to demonstrate the superior optical and mechanical properties of a new class of submicron grain-sized alumina ceramics relative to the current state-of-the-art dental ceramic materials. The translucency, the in-line transmission ( TIT) in particular, of these submicron alumina ceramics has been examined with the Rayleigh-Gans-Debye light-scattering model...
October 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28969848/silane-adhesion-mechanism-in-dental-applications-and-surface-treatments-a-review
#5
REVIEW
Jukka Pekka Matinlinna, Christie Ying Kei Lung, James Kit Hon Tsoi
OBJECTIVE: To give a current review of silane adhesion chemistry, applications of silane coupling agents and related surface pretreatment methods in contemporary dentistry. METHODS: Silane coupling agents are adhesion promoters to chemically unify dissimilar materials used in dentistry. Silanes are very effective in adhesion promotion between resin composites and silica-based or silica-coated indirect restorative materials. It is generally accepted that for non-silica-based restorations, surface pretreatment is a mandatory preliminary step to increase the silica content and then, with help of silane, improve resin bonding...
September 29, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28967392/cad-cam-high-density-polymer-implant-supported-fixed-diagnostic-prostheses
#6
Burak Yilmaz
Computer-aided design and computer-aided manufacturing (CAD-CAM) complete-arch implant-supported fixed prostheses have become popular in recent years and offer several advantages over traditional fabrication techniques. However, they also present challenges, and careful treatment planning is required, particularly for zirconia implant-supported fixed prostheses layered with feldspathic porcelain. This clinical report describes the use of a CAD-CAM high-density polymer implant-supported diagnostic prosthesis to verify the accuracy of the implant impression and evaluate the maxillomandibular relationship, esthetics, and phonetics of the planned CAD-CAM definitive implant-supported fixed prosthesis before CAM processing...
September 26, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28965676/potentiodynamic-polarization-study-of-the-corrosion-behavior-of-palladium-silver-dental-alloys
#7
Desheng Sun, William A Brantley, Gerald S Frankel, Reza H Heshmati, William M Johnston
STATEMENT OF PROBLEM: Although palladium-silver alloys have been marketed for over 3 decades for metal-ceramic restorations, understanding of the corrosion behavior of current alloys is incomplete; this understanding is critical for evaluating biocompatibility and clinical performance. PURPOSE: The purpose of this in vitro study was to characterize the corrosion behavior of 3 representative Pd-Ag alloys in simulated body fluid and oral environments and to compare them with a high-noble Au-Pd alloy...
September 28, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28959767/shear-bond-strength-of-porcelain-to-a-base-metal-compared-to-zirconia-core
#8
S M Abrisham, A Fallah Tafti, S Kheirkhah, M A Tavakkoli
STATEMENT OF PROBLEM: Recent clinical results for Zirconia all-ceramic restorations have revealed that the fracture rate 6-15% of the Zirconia framework is so low and the core of Zirconia has high stability. However, chipping-off fractures of porcelain are the most common reason for failures of Zirconia in the fixed partial dentures. OBJECTIVES: The purpose of this study was to compare the shear bond strength (SBS) of porcelain in the porcelain fused to metal and all-ceramic crowns with Zirconia core...
March 2017: J Dent Biomater
https://www.readbyqxmd.com/read/28944367/clinical-outcomes-of-full-arch-fixed-implant-supported-zirconia-prostheses-a-systematic-review
#9
Avinash Bidra, Patchanee Rungruanganunt, Marissa Gauthier
AIM: The primary aim of this systematic review was to study the clinical outcomes of one-piece fixed complete dentures (complete arch fixed implant-supported prostheses) made of zirconia for edentulous patients. The secondary aim was to compare the clinical outcomes of monolithic zirconia vs zirconia veneered with porcelain (conventional, minimal or gingival) for fixed complete dentures. MATERIALS AND METHODS: Two investigators conducted an independent electronic search of the literature, using PubMed and Scopus search engines from January 1, 2000, to August 31, 2016...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28936283/influence-of-thermal-and-mechanical-fatigue-on-the-shear-bond-strength-of-different-all-ceramic-systems
#10
Hugo-Alberto Vidotti, Jefferson-Ricardo Pereira, Elizeu Insaurralde, Luiz F Plaça, José R Delben, Accácio-Lins do Valle
BACKGROUND: To evaluate the influence of thermal and mechanical fatigue on the shear bond strength of different all-ceramic cores and veneering porcelain interfaces. MATERIAL AND METHODS: All-ceramic systems tested were lithium disilicate and zirconia veneered by layering technique. Sixty specimens (n=20) were subjected to shear bond strength. Ten of them were thermal and mechanical cycled. Fracture analysis was performed with stereomicroscopy and scanning electron microscopy...
August 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28936040/evaluation-and-comparison-of-shear-bond-strength-of-porcelain-to-a-beryllium-free-alloy-of-nickel-chromium-nickel-and-beryllium-free-alloy-of-cobalt-chromium-and-titanium-an-in-vitro-study
#11
Ananya Singh, Keerthi Ramachandra, Achut R Devarhubli
AIMS: The aim of this study was to evaluate and compare the shear bond strength of porcelain to the alloys of nickel-chromium (Ni-Cr), cobalt-chromium (Co-Cr), and titanium. MATERIALS AND METHODS: A total of 40 samples (25 mm × 3 mm × 0.5 mm) were fabricated using smooth casting wax and cast using Ni-Cr, Co-Cr, and titanium alloys followed by porcelain buildup. The samples were divided into four groups with each group containing 10 samples (Group A1-10: sandblasted Ni-Cr alloy, Group B1-10: sandblasted Co-Cr alloy, Group C1-10: nonsandblasted titanium alloy, and Group D1-10: sandblasted titanium alloy)...
July 2017: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/28927393/the-complete-digital-workflow-in-fixed-prosthodontics-a-systematic-review
#12
Tim Joda, Fernando Zarone, Marco Ferrari
BACKGROUND: The continuous development in dental processing ensures new opportunities in the field of fixed prosthodontics in a complete virtual environment without any physical model situations. The aim was to compare fully digitalized workflows to conventional and/or mixed analog-digital workflows for the treatment with tooth-borne or implant-supported fixed reconstructions. METHODS: A PICO strategy was executed using an electronic (MEDLINE, EMBASE, Google Scholar) plus manual search up to 2016-09-16 focusing on RCTs investigating complete digital workflows in fixed prosthodontics with regard to economics or esthetics or patient-centered outcomes with or without follow-up or survival/success rate analysis as well as complication assessment of at least 1 year under function...
September 19, 2017: BMC Oral Health
https://www.readbyqxmd.com/read/28924614/porcelain-gallbladder-often-an-overlooked-entity
#13
Sohail Iqbal, Sarfraz Ahmad, Usman Saeed, Mohammed Al-Dabbagh
Background  Porcelain gallbladder (GB) is a rare but potentially premalignant condition with minimal symptoms. Accident and Emergency (A&E) departments often tend to investigate abdominal pain through plain radiographs, which are occasionally reported by radiologists, thereby leaving behind few uncommon conditions, such as porcelain gallbladder unreported. Objectives  We present three cases of porcelain GB in which initial diagnosis was not considered due to the presence of various other calcifications in the upper abdomen...
October 2017: Surg J (N Y)
https://www.readbyqxmd.com/read/28910712/raman-analysis-of-cobalt-blue-pigment-in-blue-and-white-porcelain-a-reassessment
#14
Xiaochenyang Jiang, Yanying Ma, Yue Chen, Yuanqiu Li, Qinglin Ma, Zhaoxia Zhang, Changsui Wang, Yimin Yang
Cobalt blue is a famous pigment in human history. In the past decade it is widely reported that the cobalt aluminate has been detected in ancient ceramics as blue colorant in glaze, yet the acquired Raman spectra are incredibly different from that of synthesised references, necessitating a reassessment of such contradictory scenario with more accurate analytic strategies. In this study, micro-Raman spectroscopy (MRS) and scanning electron microscopy (SEM) in association with energy dispersive spectrometry (EDS) were performed on under-glaze cobalt pigments from one submerged blue and white porcelain shard dated from Wanli reign (1573-1620CE) of Ming dynasty (1365-1644CE) excavated at Nan'ao I shipwreck off the southern coast of China...
September 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28886950/influence-of-thermo-mechanical-cycling-on-porcelain-bonding-to-cobalt-chromium-and-titanium-dental-alloys-fabricated-by-casting-milling-and-selective-laser-melting
#15
Maja Antanasova, Andraž Kocjan, Janez Kovač, Borut Žužek, Peter Jevnikar
PURPOSE: The aim has been to determine the effect of thermo-mechanical cycling on shear-bond-strength (SBS) of dental porcelain to Co-Cr and Ti-based alloys fabricated by casting, computer-numerical-controlled milling, and selective-laser-melting (SLM). METHODS: Seven groups (n=22/group) of metal cylinders were fabricated by casting (Co-Cr and commercially pure-cpTi), milling (Co-Cr, cpTi, Ti-6Al-4V) or by SLM (Co-Cr and Ti-6Al-4V) and abraded with airborne-particles...
September 5, 2017: Journal of Prosthodontic Research
https://www.readbyqxmd.com/read/28883302/effect-of-framework-design-on-fracture-load-after-thermal-cycling-and-mechanical-loading-of-implant-supported-zirconia-based-prostheses
#16
Futoshi Komine, Shingo Kamio, Hiroki Takata, Shogo Yagawa, Serina Taguchi, Kohei Taguchi, Akiko Hashiguchi, Hideo Matsumura
This study evaluated the effect of zirconia framework design on fracture load of implant-supported zirconia-based prostheses after thermal cycling and mechanical loading. Three different zirconia framework designs were investigated: uniform-thickness (UNI), anatomic (ANA), and supported anatomic (SUP) designs. Each framework was layered with feldspathic porcelain (ZAC group) or indirect composite material (ZIC group). The specimens then underwent fracture load testing after thermal cycling and cyclic loading...
September 7, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28883299/cast-milled-and-ebm-manufactured-titanium-differences-in-porcelain-shear-bond-strength
#17
Evaggelia Papia, Pernilla Arnoldsson, Ayna Baudinova, Ryo Jimbo, Per Vult VON Steyern
The objectives were to analyze the oxide layer generated between titanium and porcelain during firing and compare it in different manufacturing techniques: cast, milled and EBM-technique. Seventy two specimens were manufactured, subdivided according to surface treatment: time of passivation (P) and no time of passivation (NP) before porcelain firing. Specimens from each group were analyzed with scanning electron microscopy: one only fired once, and one subjected to six firings. Remaining specimens were subjected to shear bond strength test...
September 7, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28881935/species-as-stressors-heterospecific-interactions-and-the-cellular-stress-response-under-global-change
#18
Alex R Gunderson, Emily E King, Kirsten Boyer, Brian Tsukimura, Jonathon H Stillman
Anthropogenic global change is predicted to increase the physiological stress of organisms through changes in abiotic conditions such as temperature, pH, and pollution. However, organisms can also experience physiological stress through interactions with other species, especially parasites, predators, and competitors. The stress of species interactions could be an important driver of species' responses to global change as the composition of biological communities change through factors such as distributional and phenological shifts...
July 1, 2017: Integrative and Comparative Biology
https://www.readbyqxmd.com/read/28876966/the-effect-of-resin-bonding-on-long-term-success-of-high-strength-ceramics
#19
M B Blatz, M Vonderheide, J Conejo
Digital manufacturing, all-ceramics, and adhesive dentistry are currently the trendiest topics in clinical restorative dentistry. Tooth- and implant-supported fixed restorations from computer-aided design (CAD)/computer-aided manufacturing (CAM)-fabricated high-strength ceramics-namely, alumina and zirconia-are widely accepted as reliable alternatives to traditional metal-ceramic restorations. Most recent developments have focused on high-translucent monolithic full-contour zirconia restorations, which have become extremely popular in a short period of time, due to physical strength, CAD/CAM fabrication, and low cost...
September 1, 2017: Journal of Dental Research
https://www.readbyqxmd.com/read/28874992/comparison-of-traditional-and-simplified-methods-for-repairing-cad-cam-feldspathic-ceramics
#20
Michele Carrabba, Alessandro Vichi, Chris Louca, Marco Ferrari
PURPOSE: To evaluate the adhesion to CAD/CAM feldspathic blocks by failure analysis and shear bond strength test (SBSt) of different restorative systems and different surface treatments, for purpose of moderate chipping repair. MATERIALS AND METHODS: A self-adhering flowable composite (Vertise Flow, Kerr) containing bi-functional phosphate monomers and a conventional flowable resin composite (Premise Flow, Kerr) applied with and without adhesive system (Optibond Solo Plus, Kerr) were combined with three different surface treatments (Hydrofluoric Acid Etching, Sandblasting, combination of both) for repairing feldspathic ceramics...
August 2017: Journal of Advanced Prosthodontics
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