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Pooyan Makvandi, Rezvan Jamaledin, Mostafa Jabbari, Nasser Nikfarjam, Assunta Borzacchiello
OBJECTIVE: Quaternary ammonium compounds (QACs) represent one of the most effective classes of disinfectant agents in dental materials and resin nanocomposites. This reviews aims to give a wide overview on the research in the field of antibacterial QACs in dental materials and nanocomposites. METHOD: An introduction to dental materials components as well as the microorganisms and methods of evaluation for the antimicrobial assays are presented. Then, the properties and synthesis route of QACs, as monomer and filler, are shown...
April 17, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Suhyun Kim, Moon Il Kim, Minyoung Shon, Bongkuk Seo, Choongsun Lim
Epoxy resins are widely used in various industrial fields due to their low cost, good workability, heat resistance, and good mechanical strength. However, they suffer from brittleness, an issue that must be addressed for further applications. To solve this problem, additional fillers are needed to improve the mechanical and thermal properties of the resins; zirconia is one such filler. However, it has been reported that aggregation may occur in the epoxy composites as the amount of zirconia increases, preventing enhancement of the mechanical strength of the epoxy composites...
September 1, 2018: Journal of Nanoscience and Nanotechnology
Margit L W Juhász, Ellen S Marmur
BACKGROUND: Patients seek 3-dimensional volume restoration of the jawline to obtain a "defined" line. Injection of filler into the jawline is not approved by the Food and Drug Administration; however, dermatologists have injected this area with positive results, minimal adverse events, and high patient satisfaction. OBJECTIVE: This study explores the efficacy of premixed calcium hydroxylapatite filler with integral lidocaine [CaHA(+)] to correct volume defects of the jawline...
April 19, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Tamil Selvan Natarajan, Shigeru Okamoto, Klaus Werner Stöckelhuber, Sven Wiessner, Uta Reuter, Dieter Fischer, Anik Ghosh, Gert Heinrich, Amit Das
A mechanically adaptable elastomer composite is prepared with reversible soft-stiff properties that can be easily controlled. By the exploitation of different morphological structures of calcium sulphate, which is acting as active filler in soft elastomer matrix, the magnitude of filler reinforcement can be reversibly altered that will be reflected in changes of the final stiffness of the material. The higher stiffness, in other words, the higher modulus of the composites, is realized by the in-situ development of fine nano-structured calcium sulphate di-hydrate crystals, which are formed during exposure to water and, further, this highly reinforcing crystals can be transformed to a non-reinforcing hemi-hydrate mesocrystalline structure by simply heating the system in a controlled way...
April 20, 2018: ACS Applied Materials & Interfaces
Ruili Wang, Eric Habib, X X Zhu
OBJECTIVES: The aim of this study is to evaluate the packing properties of uniform silica particles and their mixture with secondary particles yielding maximally loaded dental composites. We intend to verify the difference between the idealized models (the close-packed structures and the random-packed structures) and the actual experimental results, in order to provide guidance for the preparation of dental composites. The influence of secondary particle size and the resin composition on the physical-mechanical properties and the rheological properties of the experimental dental composites was also investigated...
April 16, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Maria Chiara Mistretta, Luigi Botta, Marco Morreale, Sebastiano Rifici, Manuela Ceraulo, Francesco Paolo La Mantia
The use of biodegradable/bio-based polymers is of great importance in addressing several issues related to environmental protection, public health, and new, stricter legislation. Yet some applications require improved properties (such as barrier or mechanical properties), suggesting the use of nanosized fillers in order to obtain bio-based polymer nanocomposites. In this work, bionanocomposites based on two different biodegradable polymers (coming from the Bioflex and MaterBi families) and two different nanosized fillers (organo-modified clay and hydrophobic-coated precipitated calcium carbonate) were prepared and compared with traditional nanocomposites with high-density polyethylene (HDPE) as matrix...
April 17, 2018: Materials
Seung Hoon Kang, Seok Hoon Moon, Bong-Il Rho, Seong Jae Youn, Hei Sung Kim
BACKGROUND: Facial wrinkles are key signs of aging which affect one's quality of life and psychological well-being. Absorbable wedge-shaped polydioxanone (PDO) sutures are popular in the esthetic clinics of Korea and may be a treatment option for static wrinkles on the upper face. OBJECTIVE: To describe a novel technique applicable to deep static wrinkles on the upper face and to assess its safety and efficacy. PATIENTS AND METHODS: A retrospective chart review was performed on the static wrinkle cases which were treated with folded, wedge-shaped PDO threads...
April 19, 2018: Journal of Cosmetic Dermatology
Ryan M McAdoo, Kylie N Key, Scott D Gronlund
Two broad approaches characterize the type of evidence that mediates recognition memory: discrete state and continuous. Discrete-state models posit a thresholded memory process that provides accurate information about an item (it is detected) or, failing that, no mnemonic information about the item. Continuous models, in contrast, posit the existence of graded mnemonic information about an item. Evidence favoring 1 approach over the other has been mixed, suggesting the possibility that the mediation of recognition memory may be adaptable and influenced by other factors...
April 19, 2018: Journal of Experimental Psychology. Learning, Memory, and Cognition
Tae-Sung Jeong, Jeong-Kil Park, Ching-Chang Ko, Franklin Garcia-Godoy, Yong Hoon Kwon
OBJECTIVE: Visual differentiation of resin and tooth in a tooth cavity is not simple due to their highly similar shade. The purpose of the present study was to find any noninvasive method which can effectively differentiate resin from sound tooth in a resin-imbedded tooth for resin repair. MATERIALS AND METHODS: For the study, various resin products were imbedded into the cavity of sound tooth. By applying laser of different wavelengths, autofluorescence (AF) of sound tooth and resin products were obtained...
April 18, 2018: Clinical Oral Investigations
Paris Tamiolakis, Evangelia Piperi, Panagiotis Christopoulos, Alexandra Sklavounou-Andrikopoulou
The increasing demand for cosmetic procedures in the orofacial area nowadays, results in a growing number of complications attributable to soft tissue fillers, including the development of foreign body granuloma. The purpose of this study is to present two additional cases of oral foreign body granulomas caused by liquid silicone and hyaluronic acid respectively and review the pertinent literature regarding the demographics, the clinical appearance, the histopathology and the treatment of these lesions. Key words: Oral foreign body granuloma, hyaluronic acid, silicone, soft tissue filler...
February 2018: Journal of Clinical and Experimental Dentistry
Caterina Casavola, Fania Palano, Francesco De Cillis, Angelo Tati, Roberto Terzi, Vincenza Luprano
Defects detection within a composite component, with the aim of understanding and predicting its mechanical behavior, is of great importance in the aeronautical field because the irregularities of the composite material could compromise functionality. The aim of this paper is to detect defects by means of non-destructive testing (NDT) on T-pull samples made by carbon fiber reinforced polymers (CFRP) and to evaluate their effect on the mechanical response of the material. Samples, obtained from an industrial stringer having an inclined web and realized with a polymeric filler between cap and web, were subjected to ultrasonic monitoring and then to T-pull mechanical tests...
April 18, 2018: Materials
Tal Dahan-Meir, Shdema Filler-Hayut, Cathy Melamed-Bessudo, Samuel Bocobza, Henryk Czosnek, Asaph Aharoni, Avraham A Levy
Current breeding relies mostly on random mutagenesis and recombination to generate novel genetic variation. However, targeted genome editing is becoming an increasingly important tool for precise plant breeding. Using the CRISPR-Cas system combined with the bean yellow dwarf virus rolling circle replicon we optimized a method for targeted mutagenesis and gene replacement in tomato. The carotenoid isomerase (CRTISO) and phytoene synthase 1 (PSY1) genes from the carotenoid biosynthesis pathway were chosen as targets due to their easily detectable change of phenotype...
April 18, 2018: Plant Journal: for Cell and Molecular Biology
Brooke Wile, Elisa Yoo, Ana Catalina Alvarez Elias, Lakshmimathy Subramanian, Kathryn Eager, Ajay Parkesh Sharma, Guido Filler
BACKGROUND Correction of hypovitaminosis D is simple, but it is unclear whether it is associated with an accelerated decline of renal allograft function in pediatric renal transplantation patients. This retrospective single center cohort study aimed at analyzing the effect of vitamin D and covariates on the slope of 1/creatinine after the first year. MATERIAL AND METHODS After ethics committee approval, 37 (14 male) pediatric renal transplant recipients on mycophenolate mofetil, who were followed between 2006 and 2014, were included in this study...
April 17, 2018: Annals of Transplantation: Quarterly of the Polish Transplantation Society
Zhengdong Wang, Jingya Liu, Yonghong Cheng, Siyu Chen, Mengmeng Yang, Jialiang Huang, Hongkang Wang, Guanglei Wu, Hongjing Wu
Development of polymer-based composites with simultaneously high thermal conductivity and breakdown strength has attracted considerable attention owing to their important applications in both electronic and electric industries. In this work, boron nitride (BN) nanofibers (BNNF) are successfully prepared as fillers, which are used for epoxy composites. In addition, the BNNF in epoxy composites are aligned by using a film casting method. The composites show enhanced thermal conductivity and dielectric breakdown strength...
April 15, 2018: Nanomaterials
Peter Frederik Horstmann, Werner Herbert Hettwer, Michael Mørk Petersen
After surgical bone tumor removal, filling of the bone defect is frequently performed using a bone graft or bone graft substitute. During follow-up, precise quantification of changes in bone mineral density, within the treated bone defect, is very difficult using conventional X-ray examinations. The objectives of this study were to characterize the pattern of resorption/biodegradation of a composite calcium sulfate/hydroxyapatite bone graft substitute and to quantify the bone defect healing with repeated dual-energy X-ray absorptiometry (DXA) measurements...
March 23, 2018: Journal of Clinical Densitometry
Ksenia I Lukanina, Timofei E Grigoriev, Sergey V Krasheninnikov, Vissarion G Mamagulashvilli, Roman A Kamyshinsky, Sergey N Chvalun
A novel high-tech composite biomimetic matrixes for a wide range of medical purposes were prepared. The structure of scaffolds was inspired by the architecture of native decellularized tissue: material consists of a sponge and fibrous components of different spatial geometry based on cellulose acetate with collagen or chitosan filler. The fibrous component was prepared by electrospinning, the sponge - freeze-drying technique. The influence of main technological parameters, such as freeze mode, polymer type and concentration, etc...
July 1, 2018: Carbohydrate Polymers
Garrett T Shumate, Rajesh Chopra, Derek Jones, Darin J Messina, Christopher K Hee
BACKGROUND: An advantage of hyaluronic acid (HA)-based fillers is reversibility. OBJECTIVE: To evaluate the ability of 2 hyaluronidases to degrade 3 HA-based fillers using a novel in vivo model. MATERIALS AND METHODS: Rats were injected with 3 HA fillers (HYC-24L+, VYC-20L, and RES-L) to create a projecting bolus. After 4 days, recombinant human hyaluronidase (HX) or ovine hyaluronidase (VIT) was administered at (1) varying doses (5 U, 10 U, or 30 U per 0...
April 13, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Joseph F Sobanko, Julia Dai, Joel M Gelfand, David B Sarwer, Ivona Percec
BACKGROUND: Minimally invasive cosmetic injectable procedures are increasingly common. However, a few studies have investigated changes in psychosocial functioning following these treatments. OBJECTIVE: To assess changes in body image, quality of life, and self-esteem following cosmetic injectable treatment with soft tissue fillers and neuromodulators. METHODS: Open, prospective study of 75 patients undergoing cosmetic injectable procedures for facial aging to evaluate changes in psychosocial functioning within 6 weeks of treatment...
April 13, 2018: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Maleeha Nayyer, Shahreen Zahid, Syed Hammad Hassan, Salman Aziz Mian, Sana Mehmood, Haroon Ahmed Khan, Muhammad Kaleem, Muhammad Sohail Zafar, Abdul Samad Khan
Objective: The objective of this study was to assess the surface properties (microhardness and wear resistance) of various composites and compomer materials. In addition, the methodologies used for assessing wear resistance were compared. Materials and Methods: This study was conducted using restorative material (Filtek Z250, Filtek Z350, QuiXfil, SureFil SDR, and Dyract XP) to assess wear resistance. A custom-made toothbrush simulator was employed for wear testing...
January 2018: European Journal of Dentistry
Mostafa Mabrouk, Shaimaa A ElShebiney, Sayed H Kenawy, Gehan T El-Bassyouni, Esmat Ma Hamzawy
Copper (Cu)-doped calcium silicate nanoparticles were synthesized by a wet precipitation method as economical bone fracture filler. The aim was to improve the overall physicochemical properties, bioactivity, and biological performance of the bone fracture filler prepared herein. The synthesized nanoparticles were evaluated using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and transmission electron microscopy (TEM). The bioactivity of the prepared nanoparticles was investigated after immersion in simulated body fluid (SBF) by means of inductively coupled plasma (ICP), SEM coupled with energy dispersive X-rays (EDX), and FTIR...
April 15, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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