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light cure

Ranjetta Poobathy, Rahmad Zakaria, Vikneswaran Murugaiyah, Sreeramanan Subramaniam
Anoectochilus sp. and Ludisia discolor are known as Jewel orchids. Both species are terrestrial wild orchids that grow in shaded areas of forests. The Jewel orchids are renowned for the beauty of their leaves, which are dark-green laced with silvery or golden veins. The orchids are used as a cure in various parts of Asia. Overharvesting and anthropogenic disturbances threaten the existence of the Jewel orchids in the wild, necessitating human intervention in their survival. An understanding of the structure and adaptations of a plant may assist in its survival when propagated outside of its habitat...
2018: PloS One
Mohammed Qasim Al Rifaiy
Objectives: To assess the bond strength of LD ceramics with resin composite material and surface conditioning using Er: YSGG laser and HF acid. Methods: Thirty LD ceramic (Emax, Ivoclar vivadent) discs were prepared using hot pressing technique and treated with hydroflouric acid (Group-1-HF acid) (9%) (n=10) and Er- yttrium, scandium, gallium and garnet laser (Group-2-ER-YSGG laser) (Waterlase iPlus, 10 Hz and power of 0.5 W, pulse duration of 230 μs) (n=10). Ten specimens were left untreated to be included as controls (Group-3-Control)...
January 2018: Pakistan Journal of Medical Sciences Quarterly
Nicky A Mandall, Joy Hickman, Tatiana V Macfarlane, Rye Cr Mattick, Declan T Millett, Helen V Worthington
BACKGROUND: Bonding of orthodontic brackets to teeth is important to enable effective and efficient treatment with fixed appliances. The problem is bracket failure during treatment which increases operator chairside time and lengthens treatment time. A prolonged treatment is likely to increase the oral health risks of orthodontic treatment with fixed appliances one of which is irreversible enamel decalcification. This is an update of the Cochrane Review first published in 2003. A new full search was conducted on 26 September 2017 but no new studies were identified...
April 9, 2018: Cochrane Database of Systematic Reviews
Konda Karthik Roy, Kanumuru Pavan Kumar, Gijo John, Sujatha Gopal Sooraparaju, Surya Kumari Nujella, Kyatham Sowmya
Aim: The aim of this study is to compare and to evaluate effect of curing light and curing modes on the nanohybrid composite resins with conventional Bis-GMA and novel tricyclodecane (TCD) monomers. Methodology: Two nanohybrid composites, IPS empress direct and charisma diamond were used in this study. Light-emitting diode (LED)-curing unit and quartz-tungsten-halogen (QTH)-curing unit which were operated into two different modes: continuous and soft start. Based on the composite resin, curing lights, and mode of curing used, the samples were divided into 8 groups...
January 2018: Journal of Conservative Dentistry: JCD
Lúcia Trazzi Prieto, Cíntia Tereza Pimenta de Araújo, Josué Junior Araujo Pierote, Dayane Carvalho Ramos Salles de Oliveira, Erick Kamiya Coppini, Luís Alexandre Maffei Sartini Paulillo
Purpose: The aim of this in vitro study was to evaluate the color stability and degree of conversion (DC) of dual-cure and light-cure cements and flowable composites after thermal aging. Materials and Methods: A total of 50 human incisors were prepared and divided into six groups ( n = 10). Veneers were fabricated using IPS Empress Direct composite resin were bonded with three types of luting agents: Light-cured, conventional dual, and flowable composite according to the manufacturer's instructions...
January 2018: Journal of Conservative Dentistry: JCD
Soo-Kyung Jun, Sun-A Yang, You-Jin Kim, Ahmed El-Fiqi, Nandin Mandakhbayar, Duck-Su Kim, Jiyeon Roh, Salvatore Sauro, Hae-Won Kim, Jung-Hwan Lee, Hae-Hyoung Lee
Restoration of hard tissue in conjunction with adhesive is a globally challenging issue in medicine and dentistry. Common clinical therapies involving application of adhesive and substitute material for functional or anatomical recovery are still suboptimal. Biomaterials with bioactivity and inhibitory effects of enzyme-mediated adhesive degradation can render a solution to this. Here, we designed a novel copper-doped bioactive glass nanoparticles (CuBGn) to offer multifunction: metalloproteinases (MMP) deactivation and remineralization and incorporated the CuBGn in resin-dentin adhesive systems, which showed most common failure of MMP mediated adhesive degradation among hard tissue adhesives, to evaluate proposed therapeutic effects...
April 4, 2018: Scientific Reports
Zhouhui Yu, Aiyong Cui, Peizhong Zhao, Huakai Wei, Fangyou Hu
INTRODUCTION: Modified epoxy suitable for ultraviolet (UV) curing is prepared by using organic silicon toughening. The curing kinetics of the composite are studied by dielectric analysis (DEA), and the two-phase compatibility of the composite is studied by scanning electron microscopy (SEM). METHODS: The tensile properties, heat resistance, and humidity resistance of the cured product are explored by changing the composition ratio of the silicone and the epoxy resin...
January 2018: Journal of Applied Biomaterials & Functional Materials
Kazushi Enomoto, Moriya Kikuchi, Atsushi Narumi, Seigou Kawaguchi
Surface modifier-free hybridization of ZrO2 nanoparticles (NPs) with epoxy-based polymers is demonstrated for the first time to afford highly transparent and refractive bulk materials. This is achieved by a unique and versatile hybridization via the one-pot direct phase transfer of ZrO2 NPs from water to epoxy monomers without any aggregation followed by curing with anhydride. Three types of representative epoxy monomers, bisphenol A glycidyl ether (BADGE), 3,4-epoxycyclohexylmethyl-3',4'-epoxycyclohexane carboxylate (CEL), and 1,3,5-tris(3-(oxiran-2-yl)propyl)-1,3,5-triazinane-2,4,6-trione (TEPIC) are used to produce transparent viscous dispersions...
April 2, 2018: ACS Applied Materials & Interfaces
Driellen Christine Zarpellon, Patrício Runnacles, Cristiane Maucoski, Dayane Jaqueline Gross, Ulisses Coelho, Frederick Allen Rueggeberg, Cesar Augusto Galvão Arrais
OBJECTIVE: This in vivo study evaluated pulp temperature (PT) rise in human premolars having deep Class V preparations during exposure to a light curing unit (LCU) using selected exposure modes (EMs). METHODS: After local Ethics Committee approval, intact first premolars (n=8) requiring extraction for orthodontic reasons, from 8 volunteers, received infiltrative and intraligamental anesthesia and were isolated using rubber dam. A minute pulp exposure was attained and sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted into the coronal pulp chamber to continuously monitor PT (°C)...
March 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Thilini R Thrimawithana, Ilva D Rupenthal, Simon S Raesch, Julie C Lim, James D Morton, Craig R Bunt
Cataracts are one of the most prevalent diseases of the lens, affecting its transparency and are the leading cause of reversible blindness in the world. The clarity of the lens is essential for its normal physiological function of refracting light onto the retina. Currently there is no pharmaceutical treatment for prevention or cure of cataracts and surgery to replace the affected lens remains the gold standard in the management of cataracts. Pharmacological treatment for prevention of cataracts is hindered by many physiological barriers that must be overcome by a therapeutic agent to reach the avascular lens...
March 28, 2018: Advanced Drug Delivery Reviews
Юрий В Смеянов, Юрий В Лахтин
OBJECTIVE: Introduction: Of the factors affecting the marginal permeability of restorations in the teeth, the state of stress-strain processes in the enamel with different design of the edge of the carious cavity has been poorly studied. The aim of this research was to study the influence of stress-strain processes in tooth enamel on the marginal permeability of class I restorations with a different design of the edge of the carious cavity. PATIENTS AND METHODS: Materials and methods: We have examined 45 pulled out intact third molars, which were divided into three groups of 15 each, depending on class 1 carious cavities formed in them...
2018: Wiadomości Lekarskie: Organ Polskiego Towarzystwa Lekarskiego
Harjot Dhillon, Sargun Singh
Pain is one of the common and debilitating health manifestations associated with the majority of diseased conditions, thus making it a serious health concern worldwide. While trying to decipher the cryptic mechanism of pain in hope to provide better gene-based therapeutics, researchers have concluded pain to be of multigenic origin making it hard to cure. Apolipoprotein E is a protein coded by APOE gene containing 4 exons, located on chromosome 19q13.2. It is among the key regulators of various crucial body functions such as lipid transport, apoptosis, vitamin k pathway, and cognition, hence, it is highly suspected to play a pivotal role in the nociception process...
May 2018: Medical Hypotheses
Ji-Won Park, Gyu-Seong Shim, Jong-Gyu Lee, Seong-Wook Jang, Hyun-Joong Kim, Jin-Nyung Choi
Ultraviolet (UV) curing is a photopolymerization technique resulting in a three-dimensional polymer network from monomers and oligomers after exposure to UV light, which is often used for fusion industry. However, shrinkage is an issue that needs to be resolved. Studies of single substances have been extensively conducted, but studies of mixture systems have not sufficiently been undertaken. In this study, we evaluate the shrinkage phenomenon by studying a monomer/monomer binary system and monomer/macromer composite systems...
March 28, 2018: Materials
Roberto De Santis, Antonio Gloria, Saverio Maietta, Massimo Martorelli, Alessandro De Luca, Gianrico Spagnuolo, Francesco Riccitiello, Sandro Rengo
Over the last three decades, it has been frequently reported that the properties of dental restorative composites cured with argon laser are similar or superior to those achieved with conventional halogen and light emitting diode (LED) curing units. Whereas laser curing is not dependent on the distance between the curing unit and the material, such distance represents a drawback for conventional curing units. However, a widespread clinical application of this kind of laser remains difficult due to cost, heavy weight, and bulky size...
March 27, 2018: Materials
Amitay Lorber, Nahum S Goldberg, Ofer N Gofrit, Dov Pode, Vladimir Yutkin, Ilan Gielchinsky, Mordechai Duvdevani, Ezekiel H Landau, Guy Hidas, Liat Apelbaum
INTRODUCTION: Kidney cancer accounts for approximately 2-3 % of all types of cancers. Renal tumors prevalence and especially the prevalence of small renal tumors, is on the rise. About half of the tumors currently diagnosed are smaller than 4 cm. Minimally invasive methods of radiofrequency ablation technology were recently developed for the treatment of small renal tumors and are characterized by reducing the surgical and anesthetic risk. The ablation is performed with a percutaneous approach guided by ultrasound, CT or MRI...
March 2018: Harefuah
Jingxin Guo, M Monica Giusti, Gönül Kaletunç
Purple corn (PC) and blueberry (BB) extracts were encapsulated in alginate-pectin hydrogel particles to protect anthocyanins (ACNs) from degradation. Combinations of alginate to pectin ratios at 82 to 18% and 43 to 57% and total gum concentrations (TGC) at 2.2% and 2.8% TGC were prepared to encapsulate both PC and BB ACN. The alginate-pectin hydrogel particles containing PC or BB extracts were produced by dripping solution into pH 1.2 buffer. Blueberry extract encapsulation efficiency was significantly higher than that of purple corn extract due to ACN chemical structure differences and the compatibility between the ACN structures and alginate-pectin hydrogel structure at the low pH environment...
May 2018: Food Research International
Hani M Nassar, Reem Ajaj, Fatin Hasanain
The light intensity of a light-curing unit is a crucial factor that affects the clinical longevity of resin composites. This study aimed to investigate the efficiency of light-curing units in use at a local governmental dental school for curing conventional and bulk-fill resin materials. A total of 166 light-curing units at three locations were examined, and the brand, type, clinic location, diameter of curing tip, tip cleanliness (using a visual score), and the output (in mW/cm2 using a digital radiometer) were recorded...
2018: Journal of Oral Science
Eliseu Aldrighi Münchow, Carine Tais Welter Meereis, Wellington Luiz de Oliveira da Rosa, Adriana Fernandes da Silva, Evandro Piva
PURPOSE: A systematic review was conducted to determine whether there were any alternative technique or additional step strategies available to reduce and control polymerization shrinkage stress development in dental resin-based restorative materials. DATA SOURCES: This report followed the PRISMA Statement. A total of 36 studies were included in this review. Two reviewers performed a literature search up to December 2016, without restriction of the year of publication, in seven databases: PubMed, Web of Science, Scopus, SciELO, LILACS, IBECS, and BBO...
March 8, 2018: Journal of the Mechanical Behavior of Biomedical Materials
M M AlShaafi, A AlQussier, M Q AlQahtani, R B Price
OBJECTIVE: To evaluate the effects of different mold materials, their diameters, and light-curing units on the mechanical properties of three resin-based composites (RBC). METHODS AND MATERIALS: A conventional nano-filled resin composite (Filtek Supreme Ultra, 3M Oral Care, St Paul, MN, USA) and two bulk-fill composites materials, Tetric Evoceram Bulk fill (Ivoclar Vivadent, Schaan, Liechtenstein) and Aura Bulk Fill (SDI, Bayswater, VIC, Australia), were tested...
March 23, 2018: Operative Dentistry
N Ilie, B I Luca
The variation in micro-hardness (HV) within simulated large cavities (10 × 6 mm) filled in one increment with three bulk-fill resin-based composites (BF-RBC) was assessed by means of a universal hardness device. Modern blue and violet-blue light curing units (LCUs) were applied in three different positions, by rotating the LCU in 120° steps. The exposure distance was 3 mm. One center and two peripheral (4-mm apart from the center) HV line profiles were measured in 0.5-mm steps at 24 hours postpolymerization to calculate the depth of cure (DOC)...
March 23, 2018: Operative Dentistry
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