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https://www.readbyqxmd.com/read/29908899/curing-potential-of-experimental-resin-composites-with-systematically-varying-amount-of-bioactive-glass-degree-of-conversion-light-transmittance-and-depth-of-cure
#1
Matej Par, Nika Spanovic, Ruza Bjelovucic, Hrvoje Skenderovic, Ozren Gamulin, Zrinka Tarle
OBJECTIVES: The aim of this work was to investigate the curing potential of an experimental resin composite series with the systematically varying amount of bioactive glass 45S5 by evaluating the degree of conversion, light transmittance and depth of cure. METHODS: Resin composites based on a Bis-GMA/TEGDMA resin with a total filler load of 70 wt% and a variable amount of bioactive glass (0-40 wt%) were prepared. The photoinitiator system was camphorquinone and ethyl-4-(dimethylamino) benzoate...
June 14, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29904754/effect-of-different-surface-treatments-on-the-tensile-bond-strength-to-lithium-disilicate-glass-ceramics
#2
Sai Kham Lyann, Tomohiro Takagaki, Toru Nikaido, Motohiro Uo, Masaomi Ikeda, Alireza Sadr, Junji Tagami
PURPOSE: To evaluate the influence of different surface treatments of lithium disilicate glass ceramics on the bonding efficacy of three luting composites. MATERIALS AND METHODS: A total of 450 blocks of e.max CAD (Ivoclar Vivadent) ground with 600-grit silicon carbide paper were prepared and divided into three groups (n = 150) according to the composite cements used: Variolink Esthetic DC (VE), Multilink Automix (MA), and SpeedCEM (SC). Each group was further divided into five subgroups (n = 10) according to the surface treatment performed: no treatment (control), Monobond Plus (MP), 37% phosphoric acid and Monobond Plus (PA), < 5% hydrofluoric acid and Monobond Plus (HF), and Monobond Etch & Prime (ME)...
June 14, 2018: Journal of Adhesive Dentistry
https://www.readbyqxmd.com/read/29902777/physico-mechanical-properties-of-resin-cement-light-cured-through-different-ceramic-spacers
#3
Fabio Antonio Piola Rizzante, Paula Minatel Locatelli, Thiago Soares Porto, Ana Flávia Sanches Borges, Rafael Francisco Lia Mondelli, Sérgio Kiyoshi Ishikiriama
The purpose of this in vitro study was to compare the micro hardness, color stability/ΔE, and degree of conversion/DC of a resin cement light cured through different ceramic spacers. Lithium-disilicate ceramic samples were obtained from IPS E-max CAD blocks (HT A1) and IPS in-Ceram (transparent neutral); and divided in 7 groups (n = 8 for each test): CTR/control group; 06 M/0.6 mm monolithic; 12 M/1.2 mm monolithic; 20 M/2.0 mm monolithic; 06B/0.4 + 0.2 mm bilayered; 12B/1.0 + 0.2 mm bilayered; 20B/1...
June 4, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29899627/bonding-performance-of-universal-adhesives-on-composite-repairs-with-or-without-silane-application
#4
Nazire Nurdan Çakir, Sezer Demirbuga, Hacer Balkaya, Muhammet Karadaş
Aim: This study aims to investigate the adhesive performance of three different universal adhesives to repair aged composite restorations, with or without the application of silane. Materials and Methods: A hundred and twenty resin composite samples were prepared, aged and randomly divided into 6 main Groups (single bond universal [SBU], All-Bond Universal [ABU], Futurabond U, Clearfil Tri-S Bond, Single Bond 2, and Clearfil SE Bond) and 2 subgroups (with or without silane)...
May 2018: Journal of Conservative Dentistry: JCD
https://www.readbyqxmd.com/read/29898608/shining-a-light-on-cell-signaling-in-leukemia-through-proteomics-relevance-for-the-clinic
#5
Fieke W Hoff, Chenyue W Hu, Amina A Qutub, Eveline S J M de Bont, Terzah M Horton, Steven M Kornblau
Although cure rates for acute leukemia have steadily improved over the past decades, leukemia remains a deadly disease. Enhanced risk stratification and new therapies are needed to improve outcome. Extensive genetic analyses have identified many mutations that contribute to the development of leukemia. However, most mutations occur infrequently and most gene alterations have been difficult to target. Most patients have more than one driver mutation in combination with secondary mutations, that result in a leukemic transformation via the alteration of proteins...
June 14, 2018: Expert Review of Proteomics
https://www.readbyqxmd.com/read/29898182/minimization-of-polymerization-shrinkage-effects-on-composite-resins-by-the-control-of-irradiance-during-the-photoactivation-process
#6
Gabriel Felipe Guimarães, Edilmar Marcelino, Ivana Cesarino, Fábio Bossoi Vicente, Carlos Roberto Grandini, Rafael Plana Simões
INTRODUCTION: High levels of shrinkage stress caused by volumetric variations during the activation process are one of the main problems in the practical application of composite resins. OBJECTIVE: The aim of this study is to reduce the shrinkage stress and minimize the effects caused by composite resin volumetric variation due to the photopolymerization. In this way, this work proposes a systematic study to determine the optimal dimming function to be applied to light curing processes...
June 11, 2018: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29896787/fatigue-behavior-of-different-cad-cam-materials-for-monolithic-implant-supported-molar-crowns
#7
Bruno Salles Sotto-Maior, Rafael Corrêa Carneiro, Carlos Eduardo Francischone, Neuza Maria Souza Picorelli Assis, Karina Lopes Devito, Plinio Mendes Senna
PURPOSE: To evaluate the fracture resistance after the thermal and mechanical fatigue of feldspathic, lithium disilicate, and resin-modified CAD/CAM monolithic crowns cemented onto a universal post abutment. MATERIALS AND METHODS: A right second mandibular molar was designed in CAD/CAM software, and 30 crowns were machined using three different materials (n = 10): feldspathic ceramic, finished only with a glaze cycle (G1); lithium disilicate, sintered and finished with a glaze cycle (G2); and resin, modified by nanoceramic and finished with rubber (G3)...
June 13, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29894150/non-electric-sustaining-bistable-polymer-framework-liquid-crystal-films-with-novel-semi-rigid-polymer-matrix
#8
Wei Hu, Mei Chen, Le Zhou, Tingjun Zhong, Xiaotao Yuan, Feiwu Chen, Lanying Zhang
In this work, a bistable polymer framework liquid crystal (PFLC) thin film by thermal curing of epoxy monomers with two different thiols, a traditional flexible-structure thiol and a novel original rigid-structure thiol has been successfully fabricated, combining a novel mixed morphology of polymer matrix and cholesteric liquid crystals with negative dielectric anisotropy. The polymer framework morphology has been presented by curing two types of epoxy monomers with two types of thiols, and the liquid crystals tend to be focal conic textures with large size domains at the initial state in the PFLC film, so that it has a moderate light transmissivity at this state between the transparent state and the opaque state...
June 12, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29885812/a-clinical-study-of-hmme-pdt-therapy-in-chinese-pediatric-patients-with-port-wine-stain
#9
Gan Li-Qiang, Wang Hua, Ni Si-Li, Tan Chun-Hua
OBJECTIVE: To report our observations from a trial of the effectiveness and safety of hematoporphyrin monomethyl ether photodynamic therapy (HMME-PDT) in treating Chinese Pediatric patients port-wine stains (PWS). METHOD: From October 2017 to December 2017, the study recruited 82 patients of PWS with negative HMME skin test results. The patients received an intravenous injection of 5 mg/kg HMME and the affected areas were exposed to 532 nm LED green light, with the irradiation power density between 80-85 mW/cm2 ...
June 7, 2018: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29883342/-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
#10
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
https://www.readbyqxmd.com/read/29882387/how-the-variations-of-the-thickness-in-ceramic-restorations-of-lithium-disilicate-and-the-use-of-different-photopolymerizers-influence-the-degree-of-conversion-of-the-resin-cements-a-systematic-review-and-meta-analysis
#11
Felipe V Martins, Wesley F Vasques, Edgard M Fonseca
PURPOSE: The purpose of this meta-analysis was to evaluate how the thickness variations in ceramic restorations of lithium disilicate and the use of different photopolymerizers influence the degree of conversion of the resin cements. METHODS: This study was performed according to the PRISMA checklist. The bibliographic research was performed to identify in vitro studies until December 2017 in the databases MEDLINE via PubMed, Web of Science, and Scopus. The selected studies were submitted to bias risk assessment...
June 7, 2018: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/29881898/when-religion-and-medicine-clash-non-beneficial-treatments-and-hope-for-a-miracle
#12
Philip M Rosoff
Patient and family demands for the initiation or continuation of life-sustaining medically non-beneficial treatments continues to be a major issue. This is especially relevant in intensive care units, but is also a challenge in other settings, most notably with cardiopulmonary resuscitation. Differences of opinion between physicians and patients/families about what are appropriate interventions in specific clinical situations are often fraught with highly strained emotions, and perhaps none more so when the family bases their desires on religious belief...
June 7, 2018: HEC Forum: An Interdisciplinary Journal on Hospitals' Ethical and Legal Issues
https://www.readbyqxmd.com/read/29878714/recurrence-of-giant-cell-tumor-of-the-spine-after-resection-a-report-of-10-cases
#13
Peng Lin, Nong Lin, Wangsiyuan Teng, Sheng-Dong Wang, Wei-Bo Pan, Xin Huang, Xiao-Bo Yan, Meng Liu, Heng-Yuan Li, Bing-Hao Li, Ling-Ling Sun, Zhan Wang, Xing-Zhi Zhou, Zhao-Ming Ye
OBJECTIVE: To review the clinical details and further treatments for recurrent spinal giant cell tumors (SGCT), and to analyze the risk factors of recurrence and shed new light on the treatment options and prognosis of recurrent SGCT. METHODS: A retrospective analysis of recurrent SGCT between April 2003 and January 2014 was performed. A total of 10 patients comprising 3 men and 7 women with a mean age of 28.9 years (range, 21-40 years) were included in the study...
May 2018: Orthopaedic Surgery
https://www.readbyqxmd.com/read/29875575/-in-vitro-evaluation-of-shear-bond-strength-of-orthodontic-brackets-bonded-with-different-adhesives
#14
Junaid Ahmed Shaik, Rajesh Kumar Reddy, K Bhagyalakshmi, Mithun J Shah, O Madhavi, S Venkat Ramesh
Background: There is necessary of dry operating field for bonding of orthodontic brackets. The presence of moisture can alter the bond strength. Hence, the aim of the present study was to evaluate the shear bond strength of orthodontic brackets with different adhesives. Materials and Methods: In this in vitro study, a total of 100 orthodontically extracted premolars with sound crown structure were divided into 4 equal groups of different primers. Bonding on the buccal surface of all teeth was done after acid etching with upper premolar brackets using different primers followed by light curing...
April 2018: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/29868625/presence-and-leaching-of-bisphenol-a-bpa-from-dental-materials
#15
Rune Becher, Hanne Wellendorf, Amrit Kaur Sakhi, Jan Tore Samuelsen, Cathrine Thomsen, Anette Kocbach Bølling, Hilde Molvig Kopperud
BPA has been reported to leach from some resin based dental restorative materials and materials used for orthodontic treatment. To confirm and update previous findings, especially in light of the new temporary lower threshold value for tolerable daily BPA intake, we have investigated the leaching of BPA from 4 composite filling materials, 3 sealants and 2 orthodontic bonding materials. The materials were either uncured and dissolved in methanol or cured. The cured materials were kept in deionized water for 24 hours or 2 weeks...
2018: Acta Biomaterialia Odontologica Scandinavica
https://www.readbyqxmd.com/read/29864724/dental-resin-curing-blue-light-induces-vasoconstriction-through-release-of-hydrogen-peroxide
#16
Elif Aybala Oktay, Huseyin Tort, Oguzhan Yıldız, Kemal Gokhan Ulusoy, Fulya Toksoy Topcu, Cigdem Ozer
Dental resin curing blue light (BL) is frequently used during treatments in dental clinics. However, little is known about the influence of BL irradiation on pulpal blood vessels. The aim of the present study was to investigate the mechanism of effect of BL irradiation on vascular tone. Rat aorta (RA) rings were irradiated with a BL source in organ baths, and the responses were recorded isometrically. Effect of BL irradiation on phenylephrine (PE) -precontraction and acetylcholine (ACh) -induced relaxation after PE -precontraction were obtained and compared in BL -irradiated and control RA rings...
May 26, 2018: Journal of Photochemistry and Photobiology. B, Biology
https://www.readbyqxmd.com/read/29863321/photonic-curing-of-low-cost-aqueous-silver-flake-inks-for-printed-conductors-with-increased-yield
#17
Harry M Cronin, Zlatka Stoeva, Martin Brown, Maxim Shkunov, S Ravi P P Silva
Printing of highly conductive tracks at low cost is of primary importance for the emerging field of flexible, plastic and large area electronics. Commonly, this is achieved by printing of metallic conductive inks, often based on Ag or Cu nanoparticles dispersed in organic solvents. The solvents must be safely removed and have particular storage and handling requirements, increasing process costs. By using water-based inks containing micron-sized silver flakes both material and process costs can be reduced, making these inks attractive for industrial applications...
June 4, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29861531/reactive-oxygen-species-explicit-dosimetry-rosed-of-a-type-1-photosensitizer
#18
Yi Hong Ong, Michele M Kim, Zheng Huang, Timothy C Zhu
Type I photodynamic therapy (PDT) is based on the use of photochemical reactions mediated through an interaction between a tumor-selective photosensitizer, photoexcitation with a specific wavelength of light, and production of reactive oxygen species (ROS). The goal of this study is to develop a model to calculate reactive oxygen species concentration ([ROS]rx ) after Tookad®-mediated vascular PDT. Mice with radiation-induced fibrosarcoma (RIF) tumors were treated with different light fluence and fluence rate conditions...
February 2018: Proceedings of SPIE
https://www.readbyqxmd.com/read/29857990/investigating-the-limits-of-resin-based-luting-composite-photopolymerization-through-various-thicknesses-of-indirect-restorative-materials
#19
C M F Hardy, S Bebelman, G Leloup, M A Hadis, W M Palin, J G Leprince
OBJECTIVE: To determine the limitations of using light-curable resin-based luting composites (RBLCs) to bond indirect ceramic/resin-composite restorations by measuring light transmittance through indirect restorative materials and the resulting degree of conversion (DC) of the luting-composites placed underneath. METHODS: Various thicknesses (0-4mm) and shades of LAVA Zirconia and LAVA Ultimate were prepared and used as light curing filters. A commercial, light curable RBLC, RelyX Veneer (control) was compared with four experimental RBLCs of the following composition: TEGDMA/BisGMA (50/50 or 30/70wt%, respectively); camphorquinone/amine (0...
May 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29857989/modification-of-the-restoration-protocol-for-resin-based-composite-rbc-restoratives-conventional-and-bulk-fill-on-cuspal-movement-and-microleakage-score-in-molar-teeth
#20
I Politi, L E J McHugh, R S Al-Fodeh, G J P Fleming
OBJECTIVE: To modify the resin-based composite (RBC) restoration protocol for standardised Class II cavities in third molar teeth restored using conventional RBCs or their bulk fill restorative counterparts. Employing cuspal deflection using a twin channel deflection measuring gauge (during) and microleakage to determine marginal integrity (following) RBC restoration, the modified restoration protocol results were compared with traditional (oblique) restoration of Class II cavities. METHODS: Thirty-two sound third molar teeth, standardised by size and morphology, were subjected to standardised Class II cavity preparations and randomly allocated to four groups...
May 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
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