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https://www.readbyqxmd.com/read/29244887/carbon-fiber-framework-for-full-arch-implant-supported-fixed-dental-prostheses-supporting-resin-based-composite-and-lithium-disilicate-ceramic-crowns-case-report-and-description-of-features
#1
Giuseppe Castorina
This case report presents a new approach for shock-absorbing carbon-fiber composite frameworks for full-arch implant-supported fixed dental prostheses supporting resin-based and lithium disilicate ceramic crowns. It describes the characteristics of the materials used, the procedures for implementing the framework, and the requirements to achieve the best mechanical and clinical properties. The result is a full-arch prosthesis with masticatory load shock-absorption capacities, chemical bonding between materials, good esthetics, and wear similar to natural enamel...
December 15, 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29244885/effect-of-fiber-post-cementation-timing-on-the-bond-strength-of-resin-cements-in-epoxy-resin-obturated-canals
#2
Luiza Salles Alves Berti, Leandro Augusto Pinto Pereira, Vanessa Galego Arias Pecorari, Flávia Lucisano Botelho Amaral, Cecília Pedroso Turssi, Roberta Tarkany Basting, Fabiana Mantovani Gomes França
This study evaluated the influence of timing after endodontic treatment and type of resin cement used on the bond strength of fiber posts to epoxy resin-obturated canals. A total of 80 bovine incisor roots were divided into four groups (n = 20). Glass fiber posts were cemented at two different times, immediately or 7 days after endodontic treatment, using either a dual-curing resin cement (RelyX ARC, 3M ESPE) or a self-adhesive resin cement (RelyX U200, 3M ESPE). Following post cementation, the samples were cross-sectioned into slices containing root dentin, cement, and fiber post at the cervical, mid, and apical root thirds...
December 15, 2017: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29244848/surface-modified-nanoparticles-as-anti-biofilm-filler-for-dental-polymers
#3
Nathan Zaltsman, Andrei C Ionescu, Ervin I Weiss, Eugenio Brambilla, Shaul Beyth, Nurit Beyth
The objective of the study was to synthesis silica nanoparticles modified with (i) a tertiary amine bearing two t-cinnamaldehyde substituents or (ii) dimethyl-octyl ammonium, alongside the well-studied quaternary ammonium polyethyleneimine nanoparticles. These were to be evaluated for their chemical and mechanical properties, as well for antibacterial and antibiofilm activity. Samples were incorporated in commercial dental resin material and the degree of monomer conversion, mechanical strength, and water contact angle were tested to characterize the effect of the nanoparticles on resin material...
2017: PloS One
https://www.readbyqxmd.com/read/29243801/adverse-reactions-to-denture-resin-materials
#4
M Kostic, A Pejcic, M Igic, N Gligorijevic
Irrespective of the new generation of dental materials, acrylates still have a wide indication field. Although they are classified as biomaterials, acrylates can have both local and systemic side effects. The individual components of the acrylic materials may leave the dental restorations and diffuse into saliva. The aim of this study was to point out the potentially toxic components of acrylic dental materials, as well as their possible adverse effects on oral tissues and the organism in general. The paper was based on the assumption that the appropriate selection of the type of acrylic material and the proper method of their preparation reduce their adverse effects to a minimum, which was proven using literature data...
December 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29243397/effect-of-strong-tooth-bleaching-with-38-hydrogen-peroxide-on-marginal-seal-of-dental-restorations-using-self-etch-and-total-etch-adhesives
#5
Morakot Piemjai, Spun Lenglerdphol
The purpose of this study was to evaluate the distance and/or thickness of dye penetration at enamel and cementum/dentin margins of restorations before and after vital bleaching. Class V cavities were prepared on extracted human premolars and restored with light-cured resin composite using either AQ-Bond or Single-Bond2 adhesives. Four conditions: no bleaching (control), restored before bleaching (RB), bleached and immediately restored (BIR), bleached and stored in artificial saliva for 7 days then restored (B7R), were used for each adhesive group...
December 15, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29241957/evaluation-of-adsorption-selectivity-of-immunoglobulins-m-a-and-g-and-purification-of-immunoglobulin-m-with-mixed-mode-resins
#6
Ying-Di Luo, Qi-Lei Zhang, Shan-Jing Yao, Dong-Qiang Lin
This study investigated adsorption selectivity of immunoglobulin M (IgM), immunoglobulin A (IgA) and immunoglobulin (IgG) on four mixed-mode resins with the functional ligands of 4-mercatoethyl-pyridine (MEP), 2-mercapto-1-methylimidazole (MMI), 5-aminobenzimidazole (ABI) and tryptophan-5-aminobenzimidazole (W-ABI), respectively. IgM purification processes with mixed-mode resins were also proposed. All resins showed typical pH-dependent adsorption, and high adsorption capacity was found at pH 5.0-8.0 with low adsorption capacity under acidic conditions...
December 9, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/29240955/pine-wilt-disease-causes-cavitation-around-the-resin-canals-and-irrecoverable-xylem-conduit-dysfunction
#7
Kenichi Yazaki, Takuma Takanashi, Natsumi Kanzaki, Masabumi Komatsu, Delphis F Levia, Daisuke Kabeya, Hiroyuki Tobita, Mitsutoshi Kitao, Atsushi Ishida
Physiological mechanisms of irreversible hydraulic dysfunction in seedlings infected with pine wilt disease (PWD) are still unclear. We employed cryo-scanning electron microscopy (cryo-SEM) to investigate the temporal and spatial changes in water distribution within the xylem of the main stem of 2-year-old Japanese black pine seedlings infested by pine wood nematodes (PWNs). Our experiment was specifically designed to compare the water relations among seedlings subjected to the following water treatment and PWN combinations: (i) well-watered versus prolonged drought (no PWNs); and (ii) well-watered with PWNs versus water-stressed with PWNs (four treatments in total)...
December 12, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/29239676/bleaching-of-sugar-cane-juice-using-a-food-grade-adsorber-resin-and-explained-by-a-kinetic-model-describing-the-variation-in-time-of-the-content-of-adsorbate
#8
J P Cruz-Tirado, Arnold Cabanillas, Raúl Siche, J Espina, Leonardo Díaz-Sánchez, Albert Ibarz
This work studies the adsorption of colored compounds in cane juice using a food-grade macroporous adsorber resin without functional groups. The adsorption equilibrium was studied through the adsorption isotherms at 30, 40, and 50 ℃. The absorbance at 420 nm was used to measure the concentration of colored compounds, which enables correlation of the residual concentration with the adsorbed concentration. Furthermore, the efficiency of the adsorption process was studied, from which it was observed that there was an improvement in efficiency with increasing resin content, while the increase in temperature was less important in the process...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/29238488/effect-of-hydrofluoric-acid-surface-treatments-on-micro-shear-bond-strength-of-cad-cam-ceramics
#9
Faraneh Mokhtarpour, Homayoon Alaghehmand, Soraya Khafri
Introduction: Dental ceramics are appreciated as highly esthetic restorative materials that can simulate the appearance of natural dentition better than other materials. The aim of this study was to evaluate the effect of hydrofluoric acid concentration and etching time on micro-shear bond strength (μSBS) to IPS e.max CAD and Vita Mark II of a dual cured resin cement (Panavia F2.0). Methods: This study was an experimental in vitro study, performed in the dental material research center of Babol University of Medical Sciences in 2016...
October 2017: Electronic Physician
https://www.readbyqxmd.com/read/29238483/the-influence-of-polishing-techniques-on-pre-polymerized-cad-cam-acrylic-resin-denture-bases
#10
Manal Rahma Alammari
Background: Lately, computer-aided design and computer-aided manufacturing (CAD/CAM) has broadly been successfully employed in dentistry. The CAD/CAM systems have recently become commercially available for fabrication of complete dentures, and are considered as an alternative technique to conventionally processed acrylic resin bases. However, they have not yet been fully investigated. Objective: The purpose of this study was to inspect the effects of mechanical polishing and chemical polishing on the surface roughness (Ra) and contact angle (wettability) of heat-cured, auto-cured and CAD/CAM denture base acrylic resins...
October 2017: Electronic Physician
https://www.readbyqxmd.com/read/29238377/masking-ability-of-a-zirconia-ceramic-on-composite-resin-substrate-shades
#11
Farhad Tabatabaian, Sima Shabani, Mahshid Namdari, Koroush Sadeghpour
Background: Masking ability of a restorative material plays an important role to cover discolored tooth structure; however, this ability has not yet been well understood in zirconia-based restorations. This study assessed the masking ability of a zirconia ceramic on composite resin substrates with different shades. Materials and Methods: Ten zirconia disc specimens, with 0.5 mm thickness and 10 mm diameter, were fabricated by a computer-aided design/computer-aided manufacturing system...
November 2017: Dental Research Journal
https://www.readbyqxmd.com/read/29238376/the-effect-of-different-root-canal-sealers-on-the-fracture-resistance-of-endodontically-treated-teeth-in-vitro-study
#12
Anuve Hrishi Phukan, Shivani Mathur, Meera Sandhu, Vinod Sachdev
Background: The aim of this study was to compare the in vitro effects of four different root canal sealers on the fracture resistance of endodontically treated teeth. Materials and Methods: Seventy-five freshly extracted human mandibular premolars were used for the study. Teeth were divided into five groups based on type of root canal sealers used. Gutta-percha was used for all the samples: Group I: AH Plus root canal sealer, Group II: MTA Fillapex root canal sealer, Group III: Apexit root canal sealer, Group IV: Conventional zinc oxide-eugenol (ZOE) sealer, Group V: Control (unobturated teeth)...
November 2017: Dental Research Journal
https://www.readbyqxmd.com/read/29237536/multivariate-curve-resolution-using-a-combination-of-mid-infrared-and-near-infrared-spectra-for-the-analysis-of-isothermal-epoxy-curing-reaction
#13
Hideki Yamasaki, Shigeaki Morita
Multivariate curve resolution (MCR) was applied to a hetero-spectrally combined dataset consisting of mid-infrared (MIR) and near-infrared (NIR) spectra collected during the isothermal curing reaction of an epoxy resin. An epoxy monomer, bisphenol A diglycidyl ether (BADGE), and a hardening agent, 4,4'-diaminodiphenyl methane (DDM), were used for the reaction. The fundamental modes of the NH and OH stretches were highly overlapped in the MIR region, while their first overtones could be independently identified in the NIR region...
November 21, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29237232/3d-printed-phantoms-mimicking-cortical-bone-for-the-assessment-of-ultrashort-echo-time-magnetic-resonance-imaging
#14
Robba Rai, David Manton, Michael G Jameson, Sonal Josan, Michael B Barton, Lois C Holloway, Gary P Liney
PURPOSE: Human cortical bone has a rapid T2 * decay, and it can be visualised using ultrashort echo time (UTE) techniques in magnetic resonance imaging (MRI). These sequences operate at the limits of gradient and transmit-receive signal performance. Development of multicompartment anthropomorphic phantoms that can mimic human cortical bone can assist with quality assurance and optimisation of UTE sequences. The aims of this study were to 1) characterise the MRI signal properties of a photopolymer resin that can be 3D printed, 2) develop multi-compartment phantoms based on the resin, and 3) demonstrate the feasibility of using these phantoms to mimic human anatomy in the assessment of UTE sequences...
December 13, 2017: Medical Physics
https://www.readbyqxmd.com/read/29236479/pathways-to-mesoporous-resin-carbon-thin-films-with-alternating-gyroid-morphology
#15
Qi Zhang, Fumiaki Matsuoka, Hyo Seon Suh, Peter A Beaucage, Shisheng Xiong, Detlef-M Smilgies, Kwan Wee Tan, Jörg G Werner, Paul F Nealey, Ulrich B Wiesner
Three-dimensional (3D) mesoporous thin films with sub-100 nm periodic lattices are of increasing interest as templates for a number of nanotechnology applications yet are hard to achieve with conventional top-down fabrication methods. Block copolymer self-assembly derived mesoscale structures provide a toolbox for such 3D template formation. In this work, single (alternating) gyroidal and double gyroidal mesoporous thin film structures are achieved via solvent vapor annealing assisted co-assembly of poly(isoprene-block-styrene-block-ethylene oxide) (PI-b-PS-b-PEO, ISO) and resorcinol/phenol formaldehyde resols...
December 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/29236363/diabetic-status-influences-the-storage-of-melatonin-in-human-salivary-glands
#16
Michela Isola, Maria Alberta Lilliu, Francesco Loy, Raffaella Isola
Recently we reported on the detailed localization of melatonin (and its receptors) in human salivary glands, revealing that serous cells are able to store and secrete melatonin into saliva. Since we found that type 2 diabetic patients display reduced melatonin content in saliva, our next step was to examine the presence of melatonin in salivary glands removed from type 2 diabetic subjects. The resulting data were compared with those previously obtained by identical procedures in non diabetics, to establish if the diabetic status may affect melatonin distribution...
December 13, 2017: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
https://www.readbyqxmd.com/read/29236177/effect-of-er-yag-laser-enamel-conditioning-and-moisture-on-the-microleakage-of-a-hydrophilic-sealant
#17
Zeynep Aslı Güçlü, Andrew Paul Hurt, Nazmiye Dönmez, Nichola Jayne Coleman
For a given sealant, successful pit and fissure sealing is principally governed by the enamel conditioning technique and the presence of moisture contamination. A new generation of hydrophilic resin sealants is reported to tolerate moisture. This study investigates the impact of Er:YAG laser pre-conditioning and moisture contamination on the microleakage of a recent hydrophilic sealant. Occlusal surfaces of extracted human molars were either acid etched (n = 30), or successively lased and acid etched (n = 30)...
December 13, 2017: Odontology
https://www.readbyqxmd.com/read/29235378/the-hexane-fraction-of-bursera-microphylla-a-gray-induces-p21-mediated-anti-proliferative-and-pro-apoptotic-effects-in-human-cancer-derived-cell-lines
#18
Sabrina Adorisio, Alessandra Fierabracci, Giulia Gigliarelli, Isabella Muscari, Lorenza Cannarile, Anna Marina Liberati, Maria Carla Marcotullio, Carlo Riccardi, Massimo Curini, Ramon Enrique Robles Zepeda, Domenico V Delfino
Bursera microphylla (BM), one of the common elephant trees, is widely distributed in the Sonoran Desert in Mexico. The Seri ethnic group in the Sonoran Desert uses BM as an anti-inflammatory and painkiller drug for the treatment of sore throat, herpes labialis, abscessed tooth, and wound healing. Dried stems and leaves of BM are used in a tea to relieve painful urination and to stimulate bronchial secretion. Furthermore, BM is used for fighting venereal diseases. To investigate the effects of the hexane fraction of resin methanol extract (BM-H) on cell growth, the acute myeloid cell line (OCI-AML3) was treated with 250, 25, or 2...
March 1, 2017: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/29235354/ultra-low-carbon-nanotube-toughened-epoxy-the-critical-role-of-a-double-layer-interface
#19
Jingwei Liu, Chao Chen, Yuezhan Feng, Yonggui Liao, Yun-Sheng Ye, Xiaolin Xie, Yiu-Wing Mai
Understanding the chemistry and structure of interfaces within epoxy resins is important for studying the mechanical properties of nanofiller-filled nanocomposites as well as for developing high performance polymer nanocomposites. Despite intensive efforts to construct nanofillers/matrix interfaces, few studies have demonstrated both an enhanced stress transferring efficiency while avoiding unfavorable defor-mation, due to undesirable interface fractures. Here, we report an optimized method to prepare epoxy-based nanocomposites whose interfaces are chemically modulated by poly(glycidyl methacrylate)-block-poly(hexyl methacrylate) (PGMA-b-PHMA) functionalized multi-walled carbon nanotubes (bc@fMWNT) and also offer a fundamental explanation of crack growth behavior and the toughening mechanism of the resulting nanocomposites...
December 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29235292/-a-new-naphthalene-derivative-from-aloe-vera-and-its-antibacterial-activity
#20
Wei-Song Kong, Jing Li, Xin Liu, Qi-Li Mi, Jian-Hua Chen, Xue-Mei Li, Guang-Yu Yang, Qiu-Fen Hu, Tao Li, Ye-Kun Yang
A new naphthalene derivative has been isolated from Aloe vera by using various chromatographic techniques, including silica gel, sephadex, MCI-gel resin, and RP-HPLC. The new compound was determined as 3-hydroxy-1-(1,7-dihydroxy-3,6-dimethoxynaphthalen-2-yl)propan-1-one (1). In the biological activity assay, compound 1 disglayed prominent antibacterial activity with a MIC90 value of (48±4) mg•L⁻¹ for methicillin resistant Staphylococcus aureus (MRSA) strain which was stronger than that of the positive control levofloxacin with a MIC90 value (58±5) mg•L⁻¹...
October 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
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