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https://www.readbyqxmd.com/read/29457157/visible-light-curing-devices-irradiance-and-use-in-302-german-dental-offices
#1
Claus-Peter Ernst, Richard B Price, Angelika Callaway, Alissa Masek, Hendrik Schwarm, Inga Rullmann, Brita Willershausen, Vicky Ehlers
PURPOSE: To determine the irradiance delivered by visible-light curing (VLC) units and obtain information about the exposure times and the maintenance protocols used by dentists. MATERIALS AND METHODS: The irradiance (mW/cm2) delivered by 526 VLCs from 302 dental offices from the Rhine- Main area, Germany, was measured using an integrating sphere (IS) and a MARC patient simulator (M-PS); additional information was gathered using a survey. RESULTS: Irradiance was measured from 117 standard quartz-tungsten-halogen (QTH), 5 high-power QTH, 2 LED 1stgeneration, 333 LED 2nd-generation, 61 LED 3rd-generation, and 8 plasma-arc curing (PAC) units...
February 16, 2018: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29456396/gingival-tissue-response-following-placement-of-a-light-cure-dressing-and-a-non-eugenol-dressing-after-periodontal-flap-procedure-a-comparative-clinical-study
#2
Ankita Kakar, Arundeep Kaur Lamba, Shruti Tandon, Farrukh Faraz, Abdul Ahad
Aim: The aim was to compare the gingival tissue response following placement of a light cure dressing (Barricaid® ) and a non-eugenol periodontal dressing (Coe-Pak™ ) after periodontal flap procedure. This was carried out by evaluating plaque deposition underneath both the dressings, healing response and the patient preference for each. Materials and Methods: A total of 12 patients with chronic generalized periodontitis requiring surgery in at least two different quadrants were enrolled for this split-mouth study...
January 2018: Journal of Natural Science, Biology, and Medicine
https://www.readbyqxmd.com/read/29448579/resin-bonding-to-type-iv-gold-alloy-conditioned-with-a-novel-mercapto-silane-system-effect-of-incorporation-of-a-phosphate-monomer
#3
Sung-Min Kwon, Bong Ki Min, Jun Sik Son, Tae-Yub Kwon
Self-assembled monolayers of thiols have been used to link a range of materials to planar gold surfaces or gold nanoparticles in nanoscience and nanotechnology. Novel mercapto silane systems are a promising alternative to dental noble metal alloys for enhanced resin bonding durability Goldbased alloys for full-cast restorations contain various base metal elements, which may bond to acidic functional monomers chemically, in addition to noble metal elements. This study examined how the additional incorporation of a phosphate monomer (di-2-hydroxyethyl methacryl hydrogenphosphate, DHP) into novel mercapto silane primer systems affected the resin bond strength to a type IV gold alloy pretreated with the primers...
February 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442091/influence-of-light-transmission-through-fiber-posts-quantitative-analysis-microhardness-and-on-bond-strength-of-a-resin-cement
#4
Luís Fernando Dos Santos Alves Morgan, Marcos Barbosa Pinotti, Fernanda Morais Ferreira, Giovana Mongruel Gomes, Guilherme Costa Silva, Rodrigo De Castro Albuquerque, Allyson Nogueira Moreira
Context: Light transmission (LT) into deeper areas of the dentin root is limited. Aim: The aim of this study is to perform a quantitative investigation of the radial transmission of light (LT) through different fiber posts and its influence on the Knoop hardness number (KHN) and bond strength (BS) of a dual-cure self-adhesive resin cement at 3 different depths. Materials and Methods: Four types of fiber posts (2 translucent and 2 conventional) were used...
January 2018: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29440788/effectiveness-of-erythrosine-mediated-photodynamic-antimicrobial-chemotherapy-on-dental-plaque-aerobic-microorganisms-a-randomized-controlled-trial
#5
Manohar Bhat, Swathi Acharya, Kakarla Veera Venkata Prasad, Raghavendra Kulkarni, Anithraj Bhat, Devikripa Bhat
Background: Dental plaque is one of the predominant causes of major oral diseases. Although mechanical and chemical methods are extensively followed to control the development of plaque, plaque-related diseases still persist. Therefore, this necessitates for alternative measures of plaque control, one such alternative is photodynamic antimicrobial chemotherapy (PACT). Materials and Methods: Split mouth randomized clinical trial (CTRI/2017/03/008239) was conducted on 30 participants who reported to the hospital...
May 2017: Journal of Indian Society of Periodontology
https://www.readbyqxmd.com/read/29439642/dental-restorative-materials-based-on-thiol-michael-photopolymerization
#6
S Huang, M Podgórski, X Zhang, J Sinha, M Claudino, J W Stansbury, C N Bowman
Step-growth thiol-Michael photopolymerizable resins, constituting an alternative chemistry to the current methacrylate-based chain-growth polymerizations, were developed and evaluated for use as dental restorative materials. The beneficial features inherent to anion-mediated thiol-Michael polymerizations were explored, such as rapid photocuring, low stress generation, ester content tunability, and improved mechanical performance in a moist environment. An ester-free tetrafunctional thiol and a ultraviolet-sensitive photobase generator were implemented to facilitate thiol-Michael photopolymerization...
February 1, 2018: Journal of Dental Research
https://www.readbyqxmd.com/read/29438889/recent-progress-in-potential-anti-hepatitis-b-virus-agents-structural-and-pharmacological-perspectives
#7
Dejuan Sun, Lingjuan Zhu, Dahong Yao, Lixia Chen, Leilei Fu, Liang Ouyang
Hepatitis B virus (HBV) infections affect about 240 million patients worldwide and increase the risk of liver cirrhosis and hepatocellular carcinoma. It is estimated that about 686 thousand people died annually of liver damage resulted from HBV infections. At present, two classes of antiviral drugs have been approved by the Food and Drug Administration (FDA) for the treatment of hepatitis B, immunomodulators (interferon [IFN]-a and pegylated-interferon [PEG-IFN]-a) and nucleos(t)ide analogs (lamivudine, telbivudine, adefovir, tenofovir [TDF], and entecavir [ETV])...
February 5, 2018: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29436570/the-effects-of-irradiance-and-exposure-time-on-the-surface-roughness-of-bulk-fill-composite-resin-restorative-materials
#8
Fahad I Alkhudhairy
To evaluate the surface roughness of 4 different bulk-fill resin-based composites cured using different irradiance levels. Methods: This in vitro study was performed in February 2017 to August 2017 at the College of Dentistry, King Saud University. Twenty-four specimens were prepared from each of the bulk-fill materials [Tetric N-Ceram (TNC), SonicFill (SF), Smart Dentin Replacement (SDR), and Filtek Bulk-Fill (FB)] using a brass metal mold, resulting in a total of 96 specimens, cured using a Bluephase N light curing unit...
February 2018: Saudi Medical Journal
https://www.readbyqxmd.com/read/29430135/a-comparative-evaluation-of-the-marginal-adaptation-of-a-thermoplastic-resin-a-light-cured-wax-and-an-inlay-casting-wax-on-stone-dies-an-in-vitro-study
#9
Reji P Gopalan, Vivek V Nair, K Harshakumar, R Ravichandran, S Lylajam, Prasanth Viswambaran
Background: Different pattern materials do not produce copings with satisfactory, marginal accuracy when used on stone dies at varying time intervals. Purpose: The purpose of this study was to evaluate and compare the vertical marginal accuracy of patterns formed from three materials, namely, thermoplastic resin, light cured wax and inlay casting wax at three-time intervals of 1, 12, and 24 h. Methodology: A master die (zirconia abutment mimicking a prepared permanent maxillary central incisor) and metal sleeve (direct metal laser sintering crown #11) were fabricated...
January 2018: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/29425441/non-thrombogenic-hydrogel-coatings-with-carbene-crosslinking-bioadhesives
#10
Himansu Sekhar Nanda, Ankur Harish Shah, Gautama Wicaksono, Oleksandr Pokholenko, Feng Gao, Ivan Djordjevic, Terry W J Steele
Bioadhesives are a current unmet clinical need for mending of blood contacting soft tissues without inducing thrombosis. Recent development of carbene precursor bioadhesives with the advantages of on-demand curing, tuneable modulus, and wet adhesion have been synthesized by grafting diazirine onto poly (amidoamine) (PAMAM-G5) dendrimers. Herein, the structure activity relationships of platelet adhesion and activation is evaluated for the first time on the cured PAMAM-g-diazirine bioadhesives. Three strategies were employed to prevent healthy human donor platelets from adhering and activating on light cured bioadhesive surfaces: 1) Attenuation of cationic surface charge, 2) anti-fouling composites by incorporating heparin and alginate in uncured formulation, and 3) heparin wash of cured bioadhesive surface...
February 9, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29422471/evaluation-of-the-flexural-strength-of-submicron-hybrid-composite-using-different-fabrication-methods-an-in-vitro-study
#11
Achla Sethi, Sameer Makkar, Kanwar Sidharth, Taranjit Kaur, Sukhpash Singh Sandhu, Amit K Joseph
AIM: The aim of this study is to perform three-point bend test on submicron hybrid composite fabricated with direct and indirect veneer technique. MATERIALS AND METHODS: A total of 20 maxillary anterior teeth were selected, and labial reduction of 0.5 to 0.75 mm with a chamfered finish line for veneer preparation was done. Teeth were divided into two groups depending on fabrication technique being used: group I-veneers fabricated with light and group II-veneers fabricated with light and heat (PHOTOPOL)...
February 1, 2018: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29409060/pheochromocytoma-paraganglioma-a-poster-child-for-cancer-metabolism
#12
Sergei G Tevosian, Hans K Ghayee
Context: Pheochromocytomas (PCCs) are tumors that are derived from the chromaffin cells of the adrenal medulla. Extra-adrenal PCCs called paragangliomas (PGLs) are derived from the sympathetic and parasympathetic chain ganglia. PCCs secrete catecholamines which cause hypertension and have adverse cardiovascular consequences as a result of catecholamine excess. PGLs may or may not produce catecholamines depending on their genetic type and anatomical location. The most worrisome aspect of these tumors is their ability to become aggressive and metastasize, for which there are no known cures...
February 1, 2018: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29401807/in-situ-retrieval-and-correction-of-aberrations-in-moldless-lenses-using-fourier-ptychography
#13
Tahseen Kamal, Lu Yang, Woei Ming Lee
Liquid droplets cured at low temperatures or using ultraviolet light are primary approaches for fabricating refractive lenses without molds. Until now the performance of moldless lens fabrication process relied heavily on this step to precisely control the shape of each liquid droplet. Hence, a major hurdle in lenses fabricated from liquid droplets is the large variability of droplet shapes because they are sensitive to small amounts of interfacial forces. The shape of the final droplet critically affects the imaging performance of the lenses and cannot be reversed easily...
February 5, 2018: Optics Express
https://www.readbyqxmd.com/read/29400843/performance-enhancement-using-a-stable-low-pretilt-molecular-configuration-and-a-novel-driving-method-for-optically-compensated-bend-liquid-crystal-devices
#14
Guan-Jhong Lin, Tien-Jung Chen, Jhao-Ting Wu, Jin-Jei Wu
A stable low-pretilt molecular configuration (SLPMC) is successfully developed in optically compensated bend (OCB) liquid crystal (LC) devices by simultaneously employing the curing voltage and surface-anchored crosslinking monomer during the polymerization process. For the SLPMC OCB cell with the low-bend state, the warm-up voltage making the LC molecules reorient from the splay to the bend state is annihilated, and the transient twist state occurring as the driven LC molecules recover from the bend to the splay state is also eliminated...
February 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29394140/effect-of-sonic-resin-composite-delivery-on-void-formation-assessed-by-micro-computed-tomography
#15
R Hirata, R R Pacheco, E Caceres, M N Janal, M F Romero, M Giannini, P G Coelho, F A Rueggeberg
OBJECTIVES: The aim of this study was to quantify the internal void volume formation in commercially available, resin composites inserted using conventional or sonic insertion methods, and analyzed using three-dimensional (3D) micro-computed tomography (μCT). METHODS AND MATERIALS: Four resin composites were evaluated: one conventional (Herculite, Ultra, Kerr Corporation, Orange, CA, USA), one flowable bulk fill (SureFil SDR Flow, Dentsply International, York, PA, USA), and two packable bulk fill (SonicFill, Kerr Corporation, and Tetric EvoCeram Bulk Fill, Ivoclar Vivadent Inc, Schaan, Liechtenstein)...
February 2, 2018: Operative Dentistry
https://www.readbyqxmd.com/read/29388786/critical-factors-for-successful-restorations-light-curing-light-energy-monitoring-and-matrices
#16
Howard E Strassler, Nisha F Ganesh
No abstract text is available yet for this article.
February 2018: Compendium of Continuing Education in Dentistry
https://www.readbyqxmd.com/read/29386778/to-evaluate-and-compare-the-effect-of-different-light-curing-modes-and-different-liners-on-cuspal-deflection-in-premolar-teeth-restored-with-bulk-filled-or-incrementally-filled-composite-measured-at-different-time-intervals
#17
Parul Mour Agarwal, Sonali Taneja, Mohit Kumar
Aim: The aim of this study is to evaluate and to compare the effect of different light-curing modes and different liners on cuspal deflection in premolar teeth restored with bulk filled or incrementally filled composite measured at different time intervals. Materials and Methods: The study was divided into two parts (Part 1-different curing modes, Part 2-different liner) each with sixty extracted human upper premolar teeth with standardized large mesio-occlusal-distal cavities prepared...
September 2017: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29383797/high-speed-3d-printing-of-high-performance-thermosetting-polymers-via-two-stage-curing
#18
Xiao Kuang, Zeang Zhao, Kaijuan Chen, Daining Fang, Guozheng Kang, Hang Jerry Qi
Design and direct fabrication of high-performance thermosets and composites via 3D printing are highly desirable in engineering applications. Most 3D printed thermosetting polymers to date suffer from poor mechanical properties and low printing speed. Here, a novel ink for high-speed 3D printing of high-performance epoxy thermosets via a two-stage curing approach is presented. The ink containing photocurable resin and thermally curable epoxy resin is used for the digital light processing (DLP) 3D printing. After printing, the part is thermally cured at elevated temperature to yield an interpenetrating polymer network epoxy composite, whose mechanical properties are comparable to engineering epoxy...
January 31, 2018: Macromolecular Rapid Communications
https://www.readbyqxmd.com/read/29380487/effect-of-silane-heat-treatment-by-laser-on-the-bond-strength-of-a-repair-composite-to-feldspathic-porcelain
#19
Seyed Mohammad Reza Hakimaneh, Sayed Shojaedin Shayegh, Mehrsima Ghavami-Lahiji, Ahmad Chokr, Azizollah Moraditalab
PURPOSE: Ceramic restoration fracture may occur in the oral cavity. Intraoral repair of fractured porcelain could be advantageous to both patient and dentist. The aim of this study was to evaluate the effect of heat treatment of the silane coupling agent by Er:YAG and CO2 lasers on the microshear bond strength of a repair composite to feldspathic porcelain. MATERIALS AND METHODS: Sixty ceramic blocks were prepared and randomly divided into six groups (n = 10): (i) HF + silane (HS); (ii) silane + CO2 laser (SC); (iii) CO2 laser + silane (CS); (iv) silane + Er:YAG laser (SE); (v) Er:YAG laser + silane (ES); (vi) bur + HF + silane (BuHS)...
January 29, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29379001/influence-of-blood-contamination-during-multimode-adhesive-application-on-the-microtensile-bond-strength-to-dentin
#20
E Kucukyilmaz, E U Celik, M Akcay, B Yasa
OBJECTIVES: The present study evaluated the effects of blood contamination performed at different steps of bonding on the microtensile bond strength (μTBS) of multimode adhesives to dentin when using the self-etch approach. MATERIALS AND METHODS: Seventy-five molars were randomly assigned to three adhesive groups comprising 25 specimens each: two multimode adhesives [Single Bond Universal (SBU) and All-Bond Universal (ABU)] and a conventional one-step self-etch adhesive [Clearfil S3 Bond Plus (CSBP)]...
December 2017: Nigerian Journal of Clinical Practice
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