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Resin composite

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https://www.readbyqxmd.com/read/29350629/conductive-films-of-silver-nanoparticles-as-novel-susceptors-for-induction-welding-of-thermoplastic-composites
#1
Rouhollah Dermanaki Farahani, Mathieu Janier, Martine Dubé
In the present work, a conductive film of silver nanoparticles (nAg) as a novel heating element type, called susceptor was developed and tested for induction welding of carbon fiber/polyphenylene sulfide (CF/PPS) thermoplastic composites, i.e., unidirectional pre-impregnated16 plies of CF/PPS compression-molded in a quasi-isotropic stacking sequence. The nAg were synthesized, dispersed in deionized (DI) water and casted onto a pure PPS film, resulting in a conductive film upon the evaporation of DI water and thermal post-annealing...
January 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29339203/clinical-performance-of-full-rehabilitations-with-direct-composite-in-severe-tooth-wear-patients-3-5-years-results
#2
B A C Loomans, C M Kreulen, H E C E Huijs-Visser, B A M A Sterenborg, E M Bronkhorst, M C D N J M Huysmans, N J M Opdam
OBJECTIVES: To evaluate the mid-term clinical performance of direct composite restorations placed in patients with pathological tooth wear needing full rehabilitation with an increase of vertical dimension of occlusion. METHODS: In a prospective trial 34 patients (34.0 ± 8.4 years; 25 males, 9 females) were treated with a minimal invasive additive technique using composite restorations. The restorative treatment protocol was to provide all teeth with composite build-up restorations in an increased vertical dimension of occlusion (VDO) using the DSO-technique...
January 12, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29338276/evaluation-of-the-water-sorption-of-luting-cements-in-different-solutions
#3
Alma Gavranović-Glamoč, Muhamed Ajanović, Samra Korać, Selma Zukić, Sanela Strujić-Porović, Alma Kamber-Ćesir, Lejla Kazazić, Emir Berhamović
OBJECTIVE: To evaluate and compare the water sorption of three luting cements in three different solutions: distilled water and artificial saliva with different pH values (7.4 and 3.0). MATERIALS AND METHODS: Resin-modified glass-ionomer cement (GC Fuji Plus) and two resin cements (Multilink Automix and Variolink II) were used. A total of 45 specimens - 15 specimens (15x1 mm) for each cement were prepared according to ISO standard 4049:2009. The water sorptions of the cements were calculated by weighing the specimens before and after immersion and desiccation...
November 2017: Acta Medica Academica
https://www.readbyqxmd.com/read/29336522/continued-root-maturation-despite-persistent-apical-periodontitis-of-immature-permanent-teeth-after-failed-regenerative-endodontic-therapy
#4
Louis M Lin, Sahng G Kim, Gabriela Martin, Bill Kahler
Three immature permanent teeth with pulp necrosis and apical periodontitis were treated with regenerative endodontic therapy (RET), which included root canal disinfection with sodium hypochlorite irrigation, intra-canal medication with calcium hydroxide paste, 17% EDTA rinse, induction of periapical bleeding into the canal, collagen matrix and MTA coronal seal, and composite resin restoration of access cavities. After different periods of follow-up, it was observed that continued root maturation, especially apical closure occurred despite persistent apical periodontitis of immature permanent teeth after failed RET...
January 16, 2018: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29334137/calcium-phosphate-precipitation-in-experimental-gaps-between-fluoride-containing-fast-setting-calcium-silicate-cement-and-dentin
#5
Bahram Ranjkesh, Ming Ding, Michel Dalstra, Jens R Nyengaard, Jacques Chevallier, Flemming Isidor, Henrik Løvschall
A novel fast-setting calcium silicate cement containing fluoride (novel-CSC) has been developed for applications in tooth crowns. The aim of this study was to assess the ability of the novel-CSC to close the experimental gaps at the dentin-cement interface. The novel-CSC was tested against Vitrebond and GC Fuji II LC. Experimental gaps of 50 or 300 μm width were created between the materials and dentin. Specimens with the 300-μm-wide gap were immersed in phosphate-buffered saline and the closed gap area was measured during 96 h...
January 15, 2018: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/29333771/-effect-of-hydrofluoric-acid-concentration-on-the-surface-morphology-and-bonding-effectiveness-of-lithium-disilicate-glass-ceramics-to-resin-composites
#6
Qian Hailan, Ren Lingyan, Nie Rongrong, Meng Xiangfeng
OBJECTIVE: This study aimed at determining the influence of hydrofluoric acid (HF) in varied concentrations on the surface morphology of lithium disilicate glass ceramics and bond durability between resin composites and post-treated lithium disilicate glass ceramics. METHODS: After being sintered, ground, and washed, 72 as-prepared specimens of lithium disilicate glass ceramics with dimensions of 11 mm×13 mm×2 mm were randomly divided into three groups. Each group was treated with acid solution [32% phosphoric acid (PA) or 4% or 9...
December 1, 2017: Hua Xi Kou Qiang Yi Xue za Zhi, Huaxi Kouqiang Yixue Zazhi, West China Journal of Stomatology
https://www.readbyqxmd.com/read/29330840/clinical-assessment-of-class-ii-resin-based-composites-versus-preformed-metal-crowns-performed-on-primary-molars-in-patients-at-high-risk-of-caries
#7
A Alyahya, A Khanum, M Qudeimat
AIM: To compare class II resin composite with preformed metal crowns (PMC) in the treatment of proximal dentinal caries in high caries-risk patients. METHODS: The charts (270) of paediatric patients with proximal caries of their primary molars were reviewed. Success or failure of a procedure was assessed using the dental notes. Survival analysis was used to calculate the mean survival time (MST) for both procedures. The influence of variables on the mean survival time was investigated...
January 12, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29330706/color-stability-of-different-composite-resins-after-polishing
#8
Stefano Ardu, O Duc, E Di Bella, I Krejci
The goals of the present study were to evaluate, in vitro, the staining of different composite resins submitted to different common beverages, and to compare the staining effect of each of these solutions. A total of 288 specimens were randomly divided into six groups and immersed for 4 weeks in five staining solutions represented by red wine, orange juice, coke, tea and coffee or in artificial saliva as a control group. When analyzed over a black background, mean ΔE00 values varied from 0.8 for Venus Diamond, Saremco Microhybrid and ELS in saliva and Estelite Posterior in coke to 37...
January 12, 2018: Odontology
https://www.readbyqxmd.com/read/29329813/effects-of-metal-ions-in-tea-polysaccharides-on-their-in-vitro-antioxidant-activity-and-hypoglycemic-activity
#9
Minghao Fan, Xun Sun, Yilin Qian, Ying Xu, Dongfeng Wang, Yanping Cao
Total tea polysaccharides (TTPS) were extracted from two kinds of pruning leaves of tea plant and fractionated into neutral tea polysaccharides (TPSI) and acidic tea polysaccharides (TPSII) by anion exchange resin D315. Some physicochemical properties, including structure, monosaccharide composition, and molecular weight distribution, as well as the 4 in vitro antioxidant activities and inhibitory effects on α-glucosidase of above polysaccharides before and after removing metal ions were investigated. By comparing TTPS and TPSII, we found that they exhibited different antioxidant activities and inhibitory actions against α-glucosidase after their metal ions were removed...
January 9, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29326506/the-bond-strength-of-nanohybrid-and-nanoceramic-composites-to-feldspathic-porcelain
#10
Hatice Özdemir, Nuran Dinçkal Yanikoglu
Background: Porcelain fracture is the most important problem in fixed prosthetic restorations. The replacement of fractured restoraions isn't often prefer by patients and dentists. Intraoral repair of fractured porcelain is a big alternative for patient and dentist. For this reason, dentists try to improve different surface treatments to increase the bond strength between porcelain and repair materials such as composite resins. Aims: The aim of this study was to evaluate the shear bond strength (SBS) of nano-hybrid (Nh...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29326505/influence-of-intracanal-irrigants-on-coronal-fracture-resistance-of-endodontically-treated-and-bleached-teeth-an-in-vitro-study
#11
Maryam Khoroushi, Fatemeh Tavakol, Farinaz Shirban, Sanaz Ziaei
Background: Irrigation has a key role in the success of endodontic treatment. Intracanal irrigant solutions have adverse effects on the physical properties of dentin. Aim: The present study aimed to evaluate the effect of different irrigation protocols on coronal fracture resistance of endodontically treated teeth undergoing bleaching treatment. Design and Materials and Methods: Access cavities were prepared in 120 maxillary premolars which were divided into two groups (n = 60) - Group A: nonbleached, Group B: bleached (B)...
October 2017: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29324684/comparative-effect-of-self-or-dual-curing-on-polymerization-kinetics-and-mechanical-properties-in-a-novel-dental-resin-based-composite-with-alkaline-filler-running-title-resin-composites-with-alkaline-fillers
#12
Nicoleta Ilie
Dental bulk-fill restorations with resin-composites (RBC) are increasing in popularity, but doubts concerning insufficient curing in depth still disconcert clinicians. An alternative might be offered by modern dual-cured RBCs, which additionally provide bioactive properties. This study assessed the impact of additional light-curing on polymerization kinetics, the degree of conversion (DC) and mechanical properties of a novel, dual-cured RBC with alkaline fillers. Since the bioactivity of a material often implies a release of compounds, the mechanical stability in simulated clinical environments was also evaluated...
January 11, 2018: Materials
https://www.readbyqxmd.com/read/29323779/effect-of-different-liners-on-fracture-resistance-of-premolars-restored-with-conventional-and-short-fiber-reinforced-composite-resins
#13
Fereshteh Shafiei, Maryam Doozandeh, Dordaneh Ghaffaripour
PURPOSE: To see whether applying four different liners under short fiber-reinforced composite (SFRC), everX Posterior, compared to conventional composite resin, Z250, affected their strengthening property in premolar MOD cavities. MATERIALS AND METHODS: Mesio-occluso-distal (MOD) cavities were prepared in 120 sound maxillary premolars divided into 10 groups (n = 12) in terms of two composite resin types and 4 liners or no liner. For each composite resin, in 5 groups no liner, resin-modified glass ionomer (RMGI), conventional flowable composite (COFL), self-adhesive flowable composite resin (SAFL), and self-adhesive resin cement (SARC) were applied prior to restoring incrementally...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323776/remineralization-of-natural-human-carious-dentin-lesions-with-an-experimental-whisker-reinforced-atraumatic-restorative-treatment-composite
#14
Chao Zhang, Stephen D Campbell, Sabine H Dickens, Bin Yang
PURPOSE: To evaluate the remineralization of natural human dentin caries with an experimental whisker-reinforced Atraumatic Restorative Treatment (ART) composite. MATERIALS AND METHODS: Teeth with moderate active dentin caries were prepared with caries-disclosing dye and hand instruments, restored with ART or resin-modified glass ionomer cement (RM-GIC), and then wet sliced into 120-μm sections with 15 sections in each group. After taking transverse microradiographs and implementing digital image analysis to determine the "mineral-loss-before," each section was incubated in artificial saliva solution (pH = 7...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29323773/direct-fiber-reinforced-interim-fixed-partial-dentures-six-year-survival-study
#15
Luciana Maria Goguta, Adrian Candea, Diana Lungeanu, Mirela Frandes, Anca Jivanescu
PURPOSE: Mechanical and optical studies of glass fiber composites have revealed great resistance and satisfactory bonds between the glass fibers and composite resins. This study aimed to evaluate the long-term survival of anterior and posterior direct glass fiber-reinforced composite (FRC) fixed partial dentures (FPD). MATERIALS AND METHODS: Twenty-three patients (9 men, 14 women) aged 18 to 67 received 23 d-FRC-FPDs. The frameworks of the FPDs were unidirectional pre-impregnated glass fibers (ever Stick C&B)...
January 11, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29322626/restorations-in-primary-teeth-a-systematic-review-on-survival-and-reasons-for-failures
#16
REVIEW
Luiz Alexandre Chisini, Kauê Collares, Mariana Gonzalez Cademartori, Luísa Jardim Corrêa de Oliveira, Marcus Cristian Muniz Conde, Flávio Fernando Demarco, Marcos Britto Corrêa
BACKGROUND: Several restorative materials with specific indications are used for filling cavities in primary teeth. AIM: To systematically review the literature in order to investigate the longevity of primary teeth restorations and the reasons for failure. DESIGN: Electronic databases were screened, and eligible studies were hand-searched to find longitudinal clinical studies evaluating the survival of restorations (class I, class II, and crown) placed with different materials in primary teeth with at least one year of follow-up...
January 10, 2018: International Journal of Paediatric Dentistry
https://www.readbyqxmd.com/read/29321010/evaluation-of-five-cad-cam-materials-by-microstructural-characterization-and-mechanical-tests-a-comparative-in-vitro-study
#17
Nesrin Sonmez, Pinar Gultekin, Volkan Turp, Gokhan Akgungor, Deniz Sen, Eitan Mijiritsky
BACKGROUND: Polymer infiltrated ceramics and nano-ceramic resins are the new restorative materials which have been developed in order to enhance the adverse properties of glass-matrix ceramics and resin composites. The aim of the present in vitro study was to evaluate the characteristics of various CAD/CAM materials through mechanical, microstructural, and SEM analysis. METHODS: Five test groups (n = 22) were formed by using the indicated CAD/CAM blocks: VITA Enamic (VITA Zahnfabrik), Lava Ultimate (3 M ESPE), IPS e...
January 8, 2018: BMC Oral Health
https://www.readbyqxmd.com/read/29317160/hydrothermal-modification-and-recycling-of-nonmetallic-particles-from-waste-print-circuit-boards
#18
Xuehua Gao, Qisheng Li, Jun Qiu
Nonmetallic particles recycled from waste print circuit boards (NPRPs) were modified by a hydrothermal treatment method and the catalysts, solvents, temperature and time were investigated, which affected the modification effect of NPRPs. The mild hydrothermal treatment method does not need high temperature, and would not cause secondary pollution. Further, the modified NPRPs were used as the raw materials for the epoxy resin and glass fibers/epoxy resin composites, which were prepared by pouring and hot-pressing method...
January 6, 2018: Waste Management
https://www.readbyqxmd.com/read/29315011/bioluminescence-analysis-of-antibacterial-photodynamic-therapy-using-methylene-blue-mediated-by-low-intensity-level-laser-against-cariogenic-biofilms
#19
Fernando Luis Florez Esteban, Morgana Regina Mendonça de Oliveira, Osmir Batista de Oliveira Júnior, Rochelle Denise Hiers, Sharukh Soli Khajotia, Hermes Pretel
OBJECTIVE: A non-destructive and real-time bioluminescence (BL) assay was used to determine the utility of antimicrobial photodynamic therapy (aPDT) treatments mediated by methylene blue (MB) and laser irradiation (LI) against intact biofilms that are capable of producing caries (cariogenic). The efficacy of antibacterial photodynamic treatments has been currently determined by using either viable colony counts (VCC) or metabolic assays (Alamar Blue) that were demonstrated to have critical limitations when used on microcolony-forming bacteria such as Streptococcus mutans...
January 9, 2018: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29314729/protein-a-chromatography-resin-lifetime-impact-of-feed-composition
#20
Mili Pathak, Katherine Lintern, Daniel G Bracewell, Anurag S Rathore
Adsorbent lifetime during protein A chromatography is not readily predicted or understood, representing a key challenge to be addressed for biopharmaceutical manufacturers. This paper focuses on the impact of feed composition on the performance of a typical agarose based protein A resin across a lifetime of 50 cycles. Cycling studies were performed using three different feed materials with varying levels of feed components including proteases, histones, DNA, and non-histone proteins. Changes in the process and quality attributes were measured...
January 5, 2018: Biotechnology Progress
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