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https://www.readbyqxmd.com/read/28633093/fracture-resistance-of-ceramic-and-polymer-based-occlusal-veneer-restorations
#1
Majed Al-Akhali, Mohamed Sad Chaar, Adham Elsayed, Abdulaziz Samran, Matthias Kern
OBJECTIVES: The purpose of this in vitro study was to evaluate the influence of thermodynamic loading on the durability and fracture resistance behavior of occlusal veneers fabricated from different biomedical dental CAD/CAM materials. METHODS: The occlusal surfaces of 64 extracted premolars were prepared in the enamel layer and restored with occlusal veneers with a fissure/cusp thickness of 0.5/0.8mm made from four different dental CAD/CAM materials: group LD lithium disilicate (e...
June 13, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28567055/surface-characteristics-and-biofilm-development-on-selected-dental-ceramic-materials
#2
Kyoung H Kim, Carolina Loch, J Neil Waddell, Geoffrey Tompkins, Donald Schwass
BACKGROUND: Intraoral adjustment and polishing of dental ceramics often affect their surface characteristics, promoting increased roughness and consequent biofilm growth. This study correlated surface roughness to biofilm development with four commercially available ceramic materials. METHODS: Four ceramic materials (Vita Enamic®, Lava™ Ultimate, Vitablocs Mark II, and Wieland Reflex®) were prepared as per manufacturer instructions. Seventeen specimens of each material were adjusted and polished to simulate clinical intraoral procedures and another seventeen remained unaltered...
2017: International Journal of Dentistry
https://www.readbyqxmd.com/read/28552287/mechanical-properties-and-internal-fit-of-4-cad-cam-block-materials
#3
Alexis Goujat, Hazem Abouelleil, Pierre Colon, Christophe Jeannin, Nelly Pradelle, Dominique Seux, Brigitte Grosgogeat
STATEMENT OF PROBLEM: Recent polymer-based computer-assisted design and computer-assisted manufacturing (CAD-CAM) materials have been commercialized for inlay restorations, a polymer-infiltrated ceramic-network (PICN) and composite resin nanoceramics. Little independent evidence regarding their mechanical properties exists. Internal adaptation is an important factor for the clinical success and longevity of a restoration, and data concerning this parameter for inlays made with these blocks are scarce...
May 26, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28527394/elucidation-of-penetration-enhancement-mechanism-of-emu-oil-using-ftir-microspectroscopy-at-emira-laboratory-of-sesame-synchrotron
#4
Randa S H Mansour, Alsayed A Sallam, Imad I Hamdan, Enam A Khalil, Ibraheem Yousef
It has been proposed that Emu oil possesses skin permeation-enhancing effect. This study aimed to address its possible penetration enhancement mechanism(s) using IR microscopy, in accordance with LPP theory. The penetration of Emu oil through the layers of human skin was accomplished by monitoring oil-IR characteristic feature at 3006cm(-1). The unsaturated components of Emu oil accumulated at about 270μm depth of skin surface. The interaction of Emu oil with lipid and protein constituents of SC was investigated in comparison with a commonly used enhancer, IPM...
May 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28502717/preferential-accumulation-of-gold-nanorods-into-human-skin-hair-follicles-effect-of-nanoparticle-surface-chemistry
#5
Nouf N Mahmoud, Alaaldin M Alkilany, Dörthe Dietrich, Uwe Karst, Amal G Al-Bakri, Enam A Khalil
HYPOTHESIS: Gold nanoparticles (GNP) are considered an ideal model to help understanding the nano-skin interface. The surface functionality of gold nanorods (GNR) is expected to influence the uptake of nanoparticles into specific targets of skin such as hair follicles or dermis. Hence, it should be possible to modify the surface chemistry of GNP to achieve more targeted and safe skin therapy. EXPERIMENTS: GNR functionalized with various surface ligands (neutral, anionic, cationic, and hydrophobic) were evaluated for their accumulation into hair follicles of human skin sheets using ex-vivo setup...
October 1, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28461047/influence-of-cement-type-and-ceramic-primer-on-retention-of-polymer-infiltrated-ceramic-crowns-to-a-one-piece-zirconia-implant
#6
Nadja Rohr, Stefan Brunner, Sabrina Märtin, Jens Fischer
STATEMENT OF PROBLEM: The best procedure for cementing a restoration to zirconia implants has not yet been established. PURPOSE: The purpose of this in vitro study was to measure the retention of polymer-infiltrated ceramic crowns to zirconia 1-piece implants using a wide range of cements. The effect of ceramic primer treatment on the retention force was also recorded. The retention results were correlated with the shear bond strength of the cement to zirconia and the indirect tensile strength of the cements to better understand the retention mechanism...
April 28, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28400359/unmet-need-for-surgery-in-south-asia
#7
Sanjay Nagral, Maharra Hussain, Sarder A Nayeem, Ranjan Dias, S Ather Enam, Samiran Nundy
No abstract text is available yet for this article.
April 11, 2017: BMJ: British Medical Journal
https://www.readbyqxmd.com/read/28395292/genes-involved-in-the-enamel-development-are-associated-with-calcium-and-phosphorus-level-in-saliva
#8
Erika Calvano Küchler, Giovana Daniela Pecharki, Myrella Lescio Castro, Junia Ramos, Fernando Barbosa, João Armando Brancher, Alexandre Rezende Vieira, Raquel Fernanda Gerlach, Paula Cristina Trevilatto
Saliva components play a crucial role in the integrity of the dental enamel and in caries susceptibility. The saliva characteristics are controlled by many factors, including genetic factors. Therefore, this study aimed to evaluate the association between the genetic variations in genes expressed in enamel development with calcium and phosphorus levels in saliva. We collected 276 unrelated 12-year-old children from private and public schools. Saliva was collected for DNA extraction from oral cells and for measurement of calcium and phosphorus...
2017: Caries Research
https://www.readbyqxmd.com/read/28395167/the-association-of-enamelin-lactoferrin-and-tumour-necrosis-factor-alpha-gene-polymorphisms-with-high-caries-susceptibility-in-chinese-children-under-4-years-old
#9
Mengchen Wang, Man Qin, Bin Xia
OBJECTIVE: The aim of this study was to assess the role of ENAM rs3796703, LTF rs1126478, and TNF-α rs1800629 in high caries susceptibility. DESIGN: The present case-control study included 1005 unrelated children under 4 years old: 505 with severe caries (dmft index ≥4) and 500 who were caries-free (dmft index=0 and without white-spot lesions). Questionnaires were obtained from parents and gardians about the children's diet and oral behavioural habits. All the children received dental examinations and oral swabbing for human genomic DNA collection...
August 2017: Archives of Oral Biology
https://www.readbyqxmd.com/read/28382465/significance-of-genetic-variations-in-developmental-enamel-defects-of-primary-dentition-in-polish-children
#10
Karolina Gerreth, Katarzyna Zaorska, Maciej Zabel, Michal Nowicki, Maria Borysewicz-Lewicka
OBJECTIVES: The aim of the study was to reveal the association between developmental defects of enamel (DDE) and single nucleotide polymorphisms (SNPs) in the ENAM, AMELX, AMBN, TUFT1, and TFIP11 genes. MATERIAL AND METHODS: The molecular analysis was carried out in 52 children, aged 10-42 months, from four nursery schools situated in the region of Poznan, Poland (26 individuals with hypomineralization and/or hypoplasia of enamel - "cases" and 26 unaffected children - "controls"), chosen from 262 individuals that had prior dental examination...
April 5, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28349958/gene-expression-based-biomarkers-for-discriminating-early-and-late-stage-of-clear-cell-renal-cancer
#11
Sherry Bhalla, Kumardeep Chaudhary, Ritesh Kumar, Manika Sehgal, Harpreet Kaur, Suresh Sharma, Gajendra P S Raghava
In this study, an attempt has been made to identify expression-based gene biomarkers that can discriminate early and late stage of clear cell renal cell carcinoma (ccRCC) patients. We have analyzed the gene expression of 523 samples to identify genes that are differentially expressed in the early and late stage of ccRCC. First, a threshold-based method has been developed, which attained a maximum accuracy of 71.12% with ROC 0.67 using single gene NR3C2. To improve the performance of threshold-based method, we combined two or more genes and achieved maximum accuracy of 70...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28345053/a-rh-ii-catalyzed-multicomponent-reaction-by-trapping-an-%C3%AE-amino-enol-intermediate-in-a-traditional-two-component-reaction-pathway
#12
Shunying Liu, Wenfeng Yao, Yuan Liu, Qinghua Wei, Jianghui Chen, Xiang Wu, Fei Xia, Wenhao Hu
Multicomponent reactions (MCRs) represent an ideal organic synthesis tool for the rapid construction of complex molecules due to their step and atom economy. Compared to two-component reactions, the development of new MCRs has been greatly limited during the 170 years since the first MCR was reported. Theoretically, the trapping of an active intermediate generated from two components by a third component could change the traditional two-component reaction pathway, leading to the discovery of MCRs. We report an example of the trapping of α-imino enols generated in situ from 1-sulfonyl-1,2,3-triazoles via α-imino metal carbene species by vinylimine ions using C(2)-substituted indoles and paraformaldehyde as precursors in the presence of a rhodium(II) catalyst...
March 2017: Science Advances
https://www.readbyqxmd.com/read/28266114/interaction-of-lifestyle-behaviour-or-systemic-diseases-with-dental-caries-and-periodontal-diseases-consensus-report-of-group-2-of-the-joint-efp-orca-workshop-on-the-boundaries-between-caries-and-periodontal-diseases
#13
Iain L C Chapple, Philippe Bouchard, Maria Grazia Cagetti, Guglielmo Campus, Maria-Clotilde Carra, Fabio Cocco, Luigi Nibali, Philippe Hujoel, Marja L Laine, Peter Lingstrom, David J Manton, Eduardo Montero, Nigel Pitts, Hélène Rangé, Nadine Schlueter, Wim Teughels, Svante Twetman, Cor Van Loveren, Fridus Van der Weijden, Alexandre R Vieira, Andreas G Schulte
Periodontal diseases and dental caries are the most common diseases of humans and the main cause of tooth loss. Both diseases can lead to nutritional compromise and negative impacts upon self-esteem and quality of life. As complex chronic diseases, they share common risk factors, such as a requirement for a pathogenic plaque biofilm, yet they exhibit distinct pathophysiologies. Multiple exposures contribute to their causal pathways, and susceptibility involves risk factors that are inherited (e.g. genetic variants), and those that are acquired (e...
March 2017: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/28243376/preventive-gabapentin-versus-pregabalin-to-decrease-postoperative-pain-after-lumbar-microdiscectomy-a-randomized-controlled-trial
#14
Mohsin Qadeer, Muhammad Waqas, Muhammad Jawad Rashid, Syed Ather Enam, Salman Sharif, Ghulam Murtaza
STUDY DESIGN: Randomized controlled trial. PURPOSE: The purpose of this study was to compare pregabalin and gabapentin for mean postoperative visual analog score (VAS) for pain in patients undergoing single-level lumbar microdiscectomy for intervertebral disc prolapse at a tertiary care hospital. OVERVIEW OF LITERATURE: Pregabalin has a superior pharmacokinetic profile and analgesic effect at lower doses than gabapentin; however, analgesic efficacy must be established during the perioperative period after lumbar spine surgery...
February 2017: Asian Spine Journal
https://www.readbyqxmd.com/read/28213184/forensic-applications-fluorescence-properties-of-tooth-coloured-restorative-materials-using-a-fluorescence-dslr-camera
#15
Ramya Kiran, Laurence J Walsh, Alexander Forrest, Marc Tennant, James Chapman
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/28195273/light-transmission-of-novel-cad-cam-materials-and-their-influence-on-the-degree-of-conversion-of-a-dual-curing-resin-cement
#16
Ferhan Egilmez, Gulfem Ergun, Isil Cekic-Nagas, Pekka K Vallittu, Lippo V J Lassila
PURPOSE: To evaluate the light transmission characteristics of different types, shades, and thicknesses of novel CAD/CAM materials and their effect on the degree of conversion (DC) of a dual-curing resin cement. MATERIALS AND METHODS: Square specimens (12 × 12 mm2) of three CAD/CAM materials - GC Cerasmart, Lava Ultimate, Vita Enamic - of different thicknesses (1.00, 1.50, and 2.00 mm, n = 5 per thickness) were irradiated with an LED unit. The amount of transmitted light was quantified...
2017: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/28161637/ameloblastin-and-enamelin-prevent-osteoclast-formation-by-suppressing-rankl-expression-via-mapk-signaling-pathway
#17
Wichida Chaweewannakorn, Wataru Ariyoshi, Toshinori Okinaga, Kazumasa Morikawa, Katsura Saeki, Kenshi Maki, Tatsuji Nishihara
Ameloblastin (Ambn) and enamelin (Enam) play a pivotal role in enamel mineralization. Previous studies have demonstrated that these enamel-related gene products also affect bone growth and remodeling; however, the underlying mechanisms have not been elucidated. In the present study, we examined the effects of Ambn and Enam on the receptor activator of nuclear factor kappa-B ligand (RANKL) expression induced with 1,25-dihydroxyvitamin D3 (1,25(OH)2D3) and dexamethasone (DEX) on mouse bone marrow stromal cell line ST2 cells...
April 8, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28089394/grinding-damage-assessment-for-cad-cam-restorative-materials
#18
Philippe Curran, Maria Cattani-Lorente, H W Anselm Wiskott, Stéphane Durual, Susanne S Scherrer
OBJECTIVES: To assess surface/subsurface damage after grinding with diamond discs on five CAD-CAM restorative materials and to estimate potential losses in strength based on crack size measurements of the generated damage. METHODS: The materials tested were: Lithium disilicate (LIT) glass-ceramic (e.max CAD), leucite glass-ceramic (LEU) (Empress CAD), feldspar ceramic (VM2) (Vita Mark II), feldspar ceramic-resin infiltrated (EN) (Enamic) and a composite reinforced with nano ceramics (LU) (Lava Ultimate)...
January 12, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28089331/evaluation-of-marginal-and-internal-adaptation-of-hybrid-and-nanoceramic-systems-with-microcomputed-tomography-an-in%C3%A2-vitro-study
#19
Güler Yildirim, Ismail H Uzun, Ali Keles
STATEMENT OF PROBLEM: The accuracy of recently introduced chairside computer-aided design and computer-aided manufacturing (CAD-CAM) blocks is not well established, and marginal integrity and internal adaptation are not known. PURPOSE: The purpose of this in vitro study was to evaluate the marginal and internal adaptation of hybrid and nanoceramics using microcomputed tomography (μ-CT). MATERIAL AND METHODS: The marginal and internal adaptation of 3 polymer-infiltrated ceramic-network (PICN) materials (Vita Enamic [VE]; Lava Ultimate [LU]; Vita Suprinity [VS]) were compared with lithium disilicate (IPS e...
January 12, 2017: Journal of Prosthetic Dentistry
https://www.readbyqxmd.com/read/28024821/machinability-of-cad-cam-materials
#20
Ramakiran Chavali, Amir H Nejat, Nathaniel C Lawson
STATEMENT OF PROBLEM: Although new materials are available for computer-aided design and computer-aided manufacturing (CAD-CAM) fabrication, limited information is available regarding their machinability. The depth of penetration of a milling tool into a material during a timed milling cycle may indicate its machinability. PURPOSE: The purpose of this in vitro study was to compare the tool penetration rate for 2 polymer-containing CAD-CAM materials (Lava Ultimate and Enamic) and 2 ceramic-based CAD-CAM materials (e...
December 23, 2016: Journal of Prosthetic Dentistry
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