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https://www.readbyqxmd.com/read/28814364/effect-of-cured-versus-uncured-adhesive-inclusion-on-the-microtensile-bond-strength-of-sealants
#1
Austin McMurphy, Xiaoming Xu, Suzanne Fournier, Zafer C Cehreli, Kramer Sherman, Courtney Tremmel, Qingzhao Yu, Janice Townsend
PURPOSE: To determine the impact of light curing of bonding agents on the microtensile bond strength (MTBS) of sealants on extracted teeth. METHODS: Flat enamel surfaces were created on 54 extracted, sound human molars by sequential grinding. Three different sealants- Clinpro (3M ESPE), Ultraseal XT Hydro (Ultradent), and Fluorshield VLC (Dentsply)- were placed after acid etching without a bonding agent (control) or with three different bonding agents - Adper Single Bond Plus (3M ESPE), Peak Universal Bond (Ultradent), and Prime&Bond Elect (Dentsply)- each in both light-cured and uncured form...
May 15, 2017: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/28812982/quantitative-criteria-to-benchmark-new-and-existing-bio-inks-for-cell-compatibility
#2
Karen Dubbin, Anthony Tabet, Sarah Heilshorn
Recent advancements in 3D bioprinting have led to the fabrication of more complex, more precise, and larger printed tissue constructs. As the field continues to advance, it is critical to develop quantitative benchmarks to compare different bio-inks for key cell-biomaterial interactions, including (1) cell sedimentation within the ink cartridge, (2) cell viability during extrusion, and (3) cell viability after ink curing. Here we develop three simple protocols for quantitative analysis of bio-ink performance...
August 16, 2017: Biofabrication
https://www.readbyqxmd.com/read/28812169/bond-strength-of-etch-and-rinse-and-self-etch-adhesive-systems-to-enamel-and-dentin-irradiated-with-a-novel-co2-9-3%C3%A2-%C3%AE-m-short-pulsed-laser-for-dental-restorative-procedures
#3
Peter Rechmann, N Bartolome, R Kinsel, R Vaderhobli, B M T Rechmann
The objective of this study was to evaluate the influence of CO2 9.3 μm short-pulsed laser irradiation on the shear bond strength of composite resin to enamel and dentin. Two hundred enamel and 210 dentin samples were irradiated with a 9.3 µm carbon dioxide laser (Solea, Convergent Dental, Inc., Natick, MA) with energies which either enhanced caries resistance or were effective for ablation. OptiBond Solo Plus [OptiBondTE] (Kerr Corporation, Orange, CA) and Peak Universal Bond light-cured adhesive [PeakTE] (Ultradent Products, South Jordan, UT) were used...
August 15, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28807329/impact-of-thio-urethane-additive-and-filler-type-on-light-transmission-and-depth-of-polymerization-of-dental-composites
#4
André Luis Faria-E-Silva, Carmem Silvia Pfeifer
OBJECTIVE: This study evaluated the effects of filler type and the addition of thio-urethane oligomers on light-transmission, polymerization kinetics and depth of cure of resin composites. METHODS: BisGMA:UDMA:TEGMA (5:3:2wt%) were mixed with 0 (control) or 20wt% thio-urethane. Fillers with various sizes and refractive indices were included and refractive index (RI) measured. Unfilled resins were used as controls. The RIs of materials were measured before and after polymerization...
August 11, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28802583/cytoskeleton-and-nuclear-lamina-affection-in-recessive-osteogenesis-imperfecta-a-functional-proteomics-perspective
#5
Assunta Gagliardi, Roberta Besio, Chiara Carnemolla, Claudia Landi, Alessandro Armini, Mona Aglan, Ghada Otaify, Samia A Temtamy, Antonella Forlino, Luca Bini, Laura Bianchi
Osteogenesis imperfecta (OI) is a collagen-related disorder associated to dominant, recessive or X-linked transmission, mainly caused by mutations in type I collagen genes or in genes involved in type I collagen metabolism. Among the recessive forms, OI types VII, VIII, and IX are due to mutations in CRTAP, P3H1, and PPIB genes, respectively. They code for the three components of the endoplasmic reticulum complex that catalyzes 3-hydroxylation of type I collagen α1Pro986. Under-hydroxylation of this residue leads to collagen structural abnormalities and results in moderate to lethal OI phenotype, despite the exact molecular mechanisms are still not completely clear...
August 9, 2017: Journal of Proteomics
https://www.readbyqxmd.com/read/28772647/cytotoxicity-of-light-cured-dental-materials-according-to-different-sample-preparation-methods
#6
Myung-Jin Lee, Mi-Joo Kim, Jae-Sung Kwon, Sang-Bae Lee, Kwang-Mahn Kim
Dental light-cured resins can undergo different degrees of polymerization when applied in vivo. When polymerization is incomplete, toxic monomers may be released into the oral cavity. The present study assessed the cytotoxicity of different materials, using sample preparation methods that mirror clinical conditions. Composite and bonding resins were used and divided into four groups according to sample preparation method: uncured; directly cured samples, which were cured after being placed on solidified agar; post-cured samples were polymerized before being placed on agar; and "removed unreacted layer" samples had their oxygen-inhibition layer removed after polymerization...
March 14, 2017: Materials
https://www.readbyqxmd.com/read/28772538/the-effects-of-uv-light-on-the-chemical-and-mechanical-properties-of-a-transparent-epoxy-diamine-system-in-the-presence-of-an-organic-uv-absorber
#7
Saeid Nikafshar, Omid Zabihi, Mojtaba Ahmadi, Abdolreza Mirmohseni, Mojtaba Taseidifar, Minoo Naebe
Despite several excellent properties including low shrinkage, good chemical resistance, curable at low temperatures and the absence of byproducts or volatiles, epoxy resins are susceptible to ultra violet (UV) damage and their durability is reduced substantially when exposed to outdoor environments. To overcome this drawback, UV absorbers have been usually used to decrease the rate of UV degradation. In this present study, the effects of UV light on the chemical, mechanical and physical properties of cured epoxy structure, as well as the effect of an organic UV absorber, Tinuvin 1130, on the epoxy properties were investigated...
February 14, 2017: Materials
https://www.readbyqxmd.com/read/28772524/preparation-and-performance-of-poly-butyl-fumarate-based-material-for-potential-application-in-led-encapsulation
#8
Liang Wang, Da-Gang Guo
A UV-curable poly(butyl fumarate) (PBF)/poly(propylene fumarate)-diacrylate (PPF-DA) hybrid material with good performance for LED encapsulation is introduced in the paper. They have been prepared by radical polymerization using PBF and PPF-DA macromers with a UV curing system. PBF and PPF-DA were characterized by Fourier-transform infrared (FT-IR) and H-nuclear magnetic resonance (¹H NMR). The thermal behavior, optical and mechanical properties of the material were examined by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), ultraviolet-visible spectroscopy (UV-vis), and a material testing system mechanical testing machine, respectively...
February 11, 2017: Materials
https://www.readbyqxmd.com/read/28772498/3d-printing-of-cytocompatible-water-based-light-cured-polyurethane-with-hyaluronic-acid-for-cartilage-tissue-engineering-applications
#9
Ming-You Shie, Wen-Ching Chang, Li-Ju Wei, Yu-Hsin Huang, Chien-Han Chen, Cheng-Ting Shih, Yi-Wen Chen, Yu-Fang Shen
Diseases in articular cartilages have affected millions of people globally. Although the biochemical and cellular composition of articular cartilages is relatively simple, there is a limitation in the self-repair ability of the cartilage. Therefore, developing strategies for cartilage repair is very important. Here, we report on a new liquid resin preparation process of water-based polyurethane based photosensitive materials with hyaluronic acid with application of the materials for 3D printed customized cartilage scaffolds...
February 8, 2017: Materials
https://www.readbyqxmd.com/read/28772427/bonding-to-different-peek-compositions-the-impact-of-dental-light-curing-units
#10
Nina Lümkemann, Marlis Eichberger, Bogna Stawarczyk
This study investigated the impact of different light curing units (LCUs) for the polymerization of adhesive system visio.link (VL) on the tensile bond strength (TBS) of different PEEK compositions. For TBS measurements, 216 PEEK specimens with varying amounts of TiO₂ (PEEK/0%, PEEK/20%, PEEK/>30%) were embedded, polished, air abraded (Al₂O₃, 50 µm, 0.4 MPa), conditioned using VL, and polymerized using either a halogen LCU (HAL-LCU) or a LED LCU (LED-LCU) for chairside or labside application, respectively...
January 14, 2017: Materials
https://www.readbyqxmd.com/read/28772426/anisotropy-of-photopolymer-parts-made-by-digital-light-processing
#11
Mario Monzón, Zaida Ortega, Alba Hernández, Rubén Paz, Fernando Ortega
Digital light processing (DLP) is an accurate additive manufacturing (AM) technology suitable for producing micro-parts by photopolymerization. As most AM technologies, anisotropy of parts made by DLP is a key issue to deal with, taking into account that several operational factors modify this characteristic. Design for this technology and photopolymers becomes a challenge because the manufacturing process and post-processing strongly influence the mechanical properties of the part. This paper shows experimental work to demonstrate the particular behavior of parts made using DLP...
January 13, 2017: Materials
https://www.readbyqxmd.com/read/28768670/self-medication-complicating-pseudo-membranous-conjunctivitis
#12
Prabhakar Singh, Sushank Bhalerao, Padmaja Kumari Rani
We aim to highlight the prevalence of using local medications for curing eye ailments in a rural population and the harmful consequence of resultant disease, ranging from something as mild as conjunctivitis to sight-threatening conditions. This case report will address one such incidence where in a local village, the doctor known as a registered medical practitioner) in the rural community, uses local remedies for his conjunctivitis and ends up in a condition where he cannot see anything beyond perceiving light...
August 2, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28760330/thermographic-analysis-of-the-effect-of-composite-type-layering-method-and-curing-light-on-the-temperature-rise-of-photo-cured-composites-in-tooth-cavities
#13
Min-Jung Kim, Ryan Jin-Young Kim, Jack Ferracane, In-Bog Lee
OBJECTIVES: The purpose of this study was to investigate temperature rise in the composite and dentin of a class I cavity in extracted human molars under different restoration conditions, including the use of different composite types, layering methods, and curing lights. METHODS: Open occlusal cavities were prepared on 28 extracted human molars. A conventional (Filtek Z250) and a bulk-fill (Filtek Bulk Fill Posterior; BFP) composite were used to restore the preparations...
July 28, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28758589/carbon-nanotubes-in-the-treatment-of-skin-cancers-safety-and-toxicological-aspects
#14
Nida Akhtar, Kamla Pathak
BACKGROUND: Skin cancer is depicted to be the most common malignant disease across the globe that is frequently diagnosed in people bearing light skin. Three common forms of skin cancers are squamous cell carcinoma, basal cell carcinoma, and malignant melanoma. Treatment of skin cancers comprises of various forms of management strategies that can help in curing the disease including the use of several therapeutic agents. Though numerous therapies have been explored till date to deliver the active therapeutics, nanoparticulate based targeted therapy has garnered considerable interest and is a promising approach in treating skin cancers...
2017: Pharmaceutical Nanotechnology
https://www.readbyqxmd.com/read/28756294/vitamin-d-cod-liver-oil-sunshine-and-phototherapy-safe-effective-and-forgotten-tools-for-treating-and-curing-tuberculosis-infections-a-comprehensive-review
#15
REVIEW
Patrick J McCullough, Douglas S Lehrer
Tuberculosis remains an epidemic throughout the world, with over 2 billion people, or more than one third of the world's population, infected with TB. In 2015, there were an estimated 10.4 million new cases of tuberculosis, and 1.8 million deaths, making TB one of the top ten causes of death worldwide. Approximately 95% of new TB cases occur in developing countries, where the costs of treatment force many patients and their families into poverty. The United Nations and the World Health Organization are working to end this global epidemic...
July 26, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28750776/in-vitro-biofilm-formation-on-resin-based-composites-after-different-finishing-and-polishing-procedures
#16
Gloria Cazzaniga, Marco Ottobelli, Andrei C Ionescu, Gaetano Paolone, Enrico Gherlone, Jack L Ferracane, Eugenio Brambilla
OBJECTIVES: To evaluate the influence of surface treatments of different resin-based composites (RBCs) on S. mutans biofilm formation. METHODS: 4 RBCs (microhybrid, nanohybrid, nanofilled, bulk-filled) and 6 finishing-polishing (F/P) procedures (open-air light-curing, light-curing against Mylar strip, aluminum oxide discs, one-step rubber point, diamond bur, multi-blade carbide bur) were evaluated. Surface roughness (SR) (n=5/group), gloss (n=5/group), scanning electron microscopy morphological analysis (SEM), energy-dispersive X-ray spectrometry (EDS) (n=3/group), and S...
July 24, 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28750753/photodynamic-therapy-with-high-power-led-mediated-by-erythrosine-eliminates-enterococcus-faecalis-in-planktonic-forms
#17
Alberto Sabin Moura Borba, Sângela Maria da Silva Pereira, Mellyna Cavalcante Mendes Borba, Marco Aurélio Benini Paschoal, Rudys Rodolfo de Jesus Tavarez, Claudia de Castro Rizzi, Meire Coelho Ferreira, Etevaldo Matos Maia Filho
BACKGROUND: The failure of endodontic treatment is linked to the presence of microorganisms, particularly Enterococcus faecalis, in the root canals. This study evaluated the effectiveness of photodynamic therapy (PDT) using erythrosine irradiated by a high-power curing light on a planktonic suspension culture of E. faecalis. METHODS: Bacterial suspensions of E. faecalis were adjusted and then mixed in a 1:1 proportion, in triplicate, in treatment groups by varying the length of irradiation time (120 and 240seconds) and the molarity of the erythrosine (5 and 10μM)...
July 24, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28750654/different-therapeutic-effects-of-cells-derived-from-human-amniotic-membrane-on-premature-ovarian-aging-depend-on-distinct-cellular-biological-characteristics
#18
Chenyue Ding, Hong Li, Yun Wang, Fuxin Wang, Huihua Wu, Rulei Chen, Jinghuan Lv, Wei Wang, Boxian Huang
BACKGROUND: Many reports have shown that various kinds of stem cells have the ability to recover premature ovarian aging (POA) function. Transplantation of human amniotic epithelial cells (hAECs) improves ovarian function damaged by chemotherapy in a mice model. Understanding of how to evaluate the distinct effects of adult stem cells in curing POA and how to choose stem cells in clinical application is lacking. METHODS: To build a different degrees of POA model, mice were administered different doses of cyclophosphamide: light dose (70 mg/kg, 2 weeks), medium dose (70 mg/kg, 1 week; 120 mg/kg, 1 week), and high dose (120 mg/kg, 2 weeks)...
July 27, 2017: Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28748051/factors-affecting-marginal-integrity-of-class-ii-bulk-fill-composite-resin-restorations
#19
Siavash Savadi Oskoee, Mahmoud Bahari, Elmira Jafari Navimipour, Amir Ahmad Ajami, Negar Ghiasvand, Ayda Savadi Oskoee
Background. Bulk-fill composite resins are a new type of resin-based composite resins, claimed to have the capacity to be placed in thick layers, up to 4 mm. This study was carried out to evaluate factors affecting gap formation in Cl II cavities restored using the bulk-fill technique. Methods. A total of 60 third molars were used in this study. Two Cl II cavities were prepared in each tooth, one on the mesial aspect 1 mm coronal to the CEJ and one on the distal aspect 1 mm apical to the CEJ. The teeth were divided into 4 groups: A: The cavities were restored using the bulk-fill technique with Filtek P90 composite resin and its adhesive system and light-cured with quartz tungsten halogen (QTH) light-curing unit...
2017: Journal of Dental Research, Dental Clinics, Dental Prospects
https://www.readbyqxmd.com/read/28740741/ten-year-follow-up-of-a-fragment-reattachment-to-an-anterior-tooth-a-conservative-approach
#20
Luiz Mendes, Laisa Laxe, Leandro Passos
This report describes the 10-year follow-up data of a patient who underwent fragment reattachment to the maxillary central incisor after coronal fracture with pulp exposure as well as the procedures followed for functional and esthetic adjustments. A 9-year-old female patient presented at the clinic of dentistry at the State University of Rio de Janeiro with a coronal fracture and pulp exposure of the right maxillary central incisor that had occurred immediately after an accident. The intact tooth fragment was recovered at the accident site and stored in milk...
2017: Case Reports in Dentistry
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