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https://www.readbyqxmd.com/read/29764286/environmental-evaluation-of-flocculation-efficiency-in-the-separation-of-the-microalgal-biomass-of-scenedesmus-sp-cultivated-in-full-scale-photobioreactors
#1
Marisa D Scherer, Fernando J C Magalhães Filho, Amanda C Oliveira, Nelson F H Selesu, Cássia M L Ugaya, André B Mariano, José V C Vargas
In this paper the environmental evaluation of the separation process of the microalgal biomass Scenedesmus sp. from full-scale photobioreactors was carried out at the Research and Development Nucleus for Sustainable Energy (NPDEAS), with different flocculants (iron sulfate - FeCl3 , sodium hydroxide - NaOH, calcium hydroxide - Ca(OH)2 and aluminum sulphate Al2 (SO4 )3 , by means of the life cycle assessment (LCA) methodology, using the SimaPro 7.3 software. Furthermore, the flocculation efficiency by means of optical density (OD) was also evaluated...
May 15, 2018: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
https://www.readbyqxmd.com/read/29756400/ph-changes-in-radicular-dentine-associated-with-calcium-hydroxide-and-corticosteroid-antibiotic-pastes
#2
Michael Cai, Paul Abbott, Jacqueline Castro Salgado
The aim was to compare hydroxyl ion diffusion through dentine following placement of calcium hydroxide and Ledermix paste. Thirty-six teeth were divided into one control (n = 6) and three experimental (n = 10) groups - (i) Pulpdent paste; (ii) Pulpdent/Ledermix pastes; (iii) Ledermix paste and (iv) Saline. pH was measured in inner and outer dentine cavities over 12 months. Inner dentine time to maximum pH (Tmax ) was 1 week for Pulpdent and 2 weeks for Pulpdent/Ledermix. Pulpdent's outer dentine Tmax was 4 weeks and Pulpdent/Ledermix was 10 weeks...
May 13, 2018: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29754275/zinc-oxide-eugenol-paste-jeopardises-the-adhesive-bonding-to-primary-dentine
#3
C W Pires, T L Lenzi, F Z M Soares, R O Rocha
AIM: This was to evaluate the influence of root canal filling pastes on microshear bond strength (µSBS) of an adhesive system to primary dentine. METHODS: Human (32) primary molars were randomly assigned into four experimental groups (n = 8): zinc oxide eugenol paste (ZOE); iodoform paste (Guedes-Pinto paste); calcium hydroxide paste thickened with zinc oxide; and no filling paste (control). Flat dentine surfaces were covered with a 1 mm-thick layer of the pastes for 15 min at 37 °C...
May 12, 2018: European Archives of Paediatric Dentistry: Official Journal of the European Academy of Paediatric Dentistry
https://www.readbyqxmd.com/read/29750093/laser-phototherapy-induces-angiogenesis-in-the-periodontal-tissue-after-delayed-tooth-replantation-in-rats
#4
Felipe-de Souza Matos, Fernanda-de Jesus Godolphim, Ricardo-Luiz-Cavalcanti Albuquerque-Júnior, Luiz-Renato Paranhos, Sigmar-de Mello Rode, Cláudio-Antonio-Talge Carvalho, Maria-Amália-Gonzaga Ribeiro
Background: Laser phototherapy (LPT) has been suggested as a new therapeutic tool to improve the repair of replanted teeth. However, its effects and mechanism of action are not yet completely understood. Objectives: This study evaluated histologically the effect of laser phototherapy (LPT) λ808 and λ660 nm on angiogenesis in the periodontal tissue of replanted teeth in rats. Material and Methods: Twenty maxillary right incisors were extracted from twenty Wistar rats and randomly assigned to four groups (n = 5): PN - teeth were stored in paper napkin for 45 min; WM - teeth were immersed in 20 ml of UHT whole cow milk for 45 min; PNL and WML - teeth received the same treatment described for PN and WM, respectively, plus LPT at λ808 and λ660 nm...
April 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29744448/biodegradation-of-mg-14li-alloy-in-simulated-body-fluid-a-proof-of-concept-study
#5
Xiao-Bo Chen, Chuanqiang Li, Daokui Xu
High corrosion kinetics and localised corrosion progress are the primary concerns arising from the clinical implementation of magnesium (Mg) based implantable devices. In this study, a binary Mg-lithium (Li) alloy consisting a record high Li content of 14% (in weight) was employed as model material aiming to yield homogenous and slow corrosion behaviour in a simulated body fluid, i.e. minimum essential medium (MEM), in comparison to that of generic Mg alloy AZ31 and biocompatible Mg-0.5Zn-0.5Ca counterparts...
March 2018: Bioactive Materials
https://www.readbyqxmd.com/read/29736777/silver-and-copper-addition-enhances-the-antimicrobial-activity-of-calcium-hydroxide-coatings-on-titanium
#6
M Meininger, S Meininger, J Groll, U Gbureck, C Moseke
Electrochemically assisted deposition of Ca(OH)2 (Portlandite) coatings on titanium surfaces has been proven as a promising method to provide the substrate with a most desirable combination of significant bacterial growth reduction on one hand and good biocompatibility on the other. Due to the rapid in vivo transformation of Ca(OH)2 to hydroxyapatite, the antimicrobial activity will be an ephemeral property of the coating when implanted into the human body. In this study, the ability to reduce bacterial growth of such portlandite coatings was significantly enhanced by an ionic modification with copper and silver ions...
May 7, 2018: Journal of Materials Science. Materials in Medicine
https://www.readbyqxmd.com/read/29727972/effects-of-low-alkalinity-binders-on-stabilization-solidification-of-geogenic-as-containing-soils-spectroscopic-investigation-and-leaching-tests
#7
Jiang-Shan Li, Lei Wang, Jin-Li Cui, Chi Sun Poon, Jingzi Beiyuan, Daniel C W Tsang, Xiang-Dong Li
The low-alkalinity stabilization/solidification (S/S) treatment of the soil containing high concentrations of geogenic As by physical encapsulation is considered as a proper management before land development; however, the choice of an effective binder and the leaching potential of As remain uncertain. In this study, the influence of S/S binders (cement blended with fuel ash (FA), furnace bottom ash (FBA), or ground granulated blast furnace slag (GGBS)) on the speciation and leaching characteristics of geogenic As was studied...
August 1, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29697396/influence-of-tricalcium-silicate-on-course-of-traumatic-pulpitis
#8
I Kovach, K Buniatian, A Makarevych, A Verbyts'ka, V Gargin
The use of Tricalcium Silicate (TS) as an odontotropic preparation makes it possible to create a hermetic crown restoration with a high degree of adhesion. However, the use of TS silicate by direct pulp capping remains disputable. The aim of this study was to determine the effects of TS on course of traumatic pulpitis by detection of morpho-functional peculiarities of changes in pulp tissue. We performed experimental investigation (on rabbits, males, aging three-month) for study of the morpho-functional changes of the pulp tissues with modeling of traumatic pulpitis and direct pulp capping with TS preparation (8 animals, investigated group) and calcium hydroxide (Calasept, NORDISKA DENTAL) preparation (8 animals, comparison group)...
March 2018: Georgian Medical News
https://www.readbyqxmd.com/read/29696535/defluoridation-using-novel-chemically-treated-carbonized-bone-meal-batch-and-dynamic-performance-with-scale-up-studies
#9
Somak Chatterjee, Munmun Mukherjee, Sirshendu De
Novel defluoridating adsorbent was synthesized by chemical treatment of carbonized bone meal using aluminum sulfate and calcium oxide. Precursor for chemical treatment was prepared by partial carbonization of raw bone meal at 550 °C for 4 h. Maximum fluoride removal capacity was 150 mg/g when carbonized bone meal (100 g/L) was treated with aluminum sulfate (500 g/L) and calcium oxide (15 g/L). Morphological analysis revealed formation of a coating layer consisting of aluminum compounds on the precursor surface...
April 25, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29692831/comparison-of-residual-triple-antibiotic-paste-propolis-and-calcium-hydroxide-on-root-canal-walls-in-natural-open-apex-teeth-an-in-vitro-study
#10
Armita Rouhani, Mahbobe Erfanzadeh, Hamid Jafarzadeh, Elham Najafi
Introduction: Endodontic therapy is challenging in open apex teeth. One of these problems is the residue of medicaments on root canal walls. The aim of this study was to evaluate the amount of residual materials on canal walls after the use as medicaments within natural open apex teeth. Methods and Materials: A total of 45 human extracted single-rooted premolars with open apices were selected. After cutting off the crowns, root canals were gently instrumented using #40 files and irrigated with 0...
2018: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29690959/evaluation-of-microleakage-in-single-rooted-teeth-obturated-with-thermoplasticized-gutta-percha-using-various-endodontic-sealers-an-in-vitro-study
#11
Maham Muneeb Lone, Farhan Raza Khan, Muneeb Ahmed Lone
OBJECTIVE: To compare apical microleakage of extracted, single-rooted teeth obturated with thermoplasticized injectable gutta-percha using two different endodontic sealers (calcium-hydroxide and resin based). STUDY DESIGN: An experimental study. PLACE AND DURATION OF STUDY: The Aga Khan University Hospital (AKUH), Dental Clinics and Laboratory from June to September 2015. METHODOLOGY: The study was conducted using extracted teeth...
May 2018: Journal of the College of Physicians and Surgeons—Pakistan: JCPSP
https://www.readbyqxmd.com/read/29680722/effect-of-calcium-hydroxide-dressing-on-the-dentinal-tubule-penetration-of-2-different-root-canal-sealers-a-confocal-laser-scanning-microscopic-study
#12
Emel Uzunoglu-Özyürek, Özge Erdoğan, Sevinç Aktemur Türker
INTRODUCTION: The purpose of this study was to evaluate the effect of calcium hydroxide (Ca[OH]2 ) dressing on the dentinal tubule penetration of epoxy resin-based sealer (AH 26; Dentsply Maillefer, Ballaigues, Switzerland) and tricalcium silicate-based sealer (BioRoot RCS; Septodont, Saint Maurdes Fosses, France). METHODS: Fifty-two single-rooted mandibular premolars were used. Four samples were assigned as the positive control. Twenty-four samples received Ca(OH)2 labeled with rhodamine B, whereas the rest did not...
April 18, 2018: Journal of Endodontics
https://www.readbyqxmd.com/read/29680625/ultrasonic-synthesis-of-hydroxyapatite-in-non-cavitation-and-cavitation-modes
#13
A L Nikolaev, A V Gopin, A V Severin, V N Rudin, M A Mironov, N V Dezhkunov
The size control of materials is of great importance in research and technology because materials of different size and shape have different properties and applications. This paper focuses on the synthesis of hydroxyapatite in ultrasound fields of different frequencies and intensities with the aim to find the conditions which allow control of the particles size. The results are evaluated by X-ray diffraction, Transmission Electron Microscopy, morphological and sedimentation analyses. It is shown that the hydroxyapatite particles synthesized at low intensity non-cavitation regime of ultrasound have smaller size than those prepared at high intensity cavitation regime...
June 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29677612/synthesis-characterization-and-working-mechanism-of-a-novel-sustained-release-type-fluid-loss-additive-for-seawater-cement-slurry
#14
Lei Cao, Jintang Guo, Jianhua Tian, Yang Xu, Miaomiao Hu, Chun Guo, Meiyu Wang, Jinjie Fan
Synthetic polymer fluid loss additive (FLA), an important type of admixture, was broadly applied in modern well cementation. However, the filter loss volume and fluidity of cement pastes containing polymer-FLA would deteriorate remarkably when sea water was used in mixing slurries instead of fresh water. In this study, a novel sustained-release-type fluid loss additive(S-FLA) was synthesized by means of anion-exchange intercalation reaction between an anionic type-copolymer and a calcium/aluminum type-Layered Double Hydroxide (Ca/Al-LDH)...
April 4, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29670738/retreatment-of-failed-revascularization-revitalization-of-immature-permanent-tooth-a-case-report
#15
Radovan Žižka, Jiří Šedý, Iva Voborná
The aim of this article is to describe the clinical case of the non-surgical retreatment of a failed revascularization/revitalization treatment (RRT). The retreatment was preceded by two sessions including an interim medication with calcium hydroxide and a modified irrigation protocol containing a highly-concentrated sodium hypochlorite and prolonged usage of ethylenediaminetetraacetic acid (EDTA) to reverse unacceptable side effects of hypochlorite. During a 15- month follow-up, the healing of the periapical lesion, increased thickening of root canal walls and maturation of root was apparent...
February 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29670728/biological-and-physico-chemical-properties-of-new-root-canal-sealers
#16
Marco Colombo, Claudio Poggio, Alberto Dagna, Maria-Vittoria Meravini, Paolo Riva, Federico Trovati, Giampiero Pietrocola
Background: The purpose of the present study was to compare the biological and the physico-chemical properties of bioceramic-based root canal sealers, calcium hydroxide-based, MTA-based and epoxy resin-based root canal sealers. Material and Methods: Two bioceramic-based sealers, one calcium hydroxide-based sealer, one MTA-based sealer and two epoxy resin-based sealers were tested. Results: EasySeal and MTA Fillapex showed severe citotoxic activity, AH Plus and SealapexTM moderate cytotoxicity, BioRoot™ RCS and TotalFill BC Sealer were both cytocompatible...
February 2018: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/29667533/the-use-of-metal-hydroxide-sludge-in-natura-and-calcined-for-the-adsorption-of-brilliant-blue-dye-in-aqueous-solution
#17
Ana Maria Salgueiro Baptisttella, Andressa Aziz Diniz Araújo, Matheus Caldas Barreto, Vivian Stumpf Madeira, Mauricio Alves da Motta Sobrinho
Industrial waste such as metal hydroxide sludge (in natura and calcined) from galvanic bath was evaluated as an adsorbent in the removal of brilliant blue synthetic dye (NB 180) in aqueous solution. The samples were characterised using X-ray fluorescence analysis (XRF), X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), infrared spectroscopy (FT - IR), as well as the specific surface area (BET) and the point of zero charge (pHZCP ). The effects of the conditions in relation to pH and adsorbent dosage were also investigated...
April 18, 2018: Environmental Technology
https://www.readbyqxmd.com/read/29656513/acidic-and-alkaline-chemicals-influence-on-a-tricalcium-silicate-based-dental-biomaterial
#18
Prasanna Neelakantan, Todd Berger, Carolyn Primus, Hagay Shemesh, Paul R Wesselink
Bioactive hydraulic tricalcium silicate materials are commonly used in several dental procedures. Mineral Trioxide Aggregate (MTA) is one such material, which is used in a variety of clinical applications, the most recent of which is root canal sealing material, during which, the MTA potentially comes in contact with remnants of the chemical agents used for disinfecting root canals. The effects of commonly used root canal irrigating solutions on MTA have not been investigated in depth, thus far. The aim of this study was to determine the effect of five common chemical agents used in root canal preparation (sodium hypochlorite/NaOCl, ethylene diaminetetraacetic acid/EDTA, mixture of sodium hypochlorite and etidronic acid/NaOCl + EA, mixture of EDTA and Chlorhexidine/QMix, or saline) on a commercial tricalcium silicate (MTA Plus)...
April 15, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29645286/effect-of-curing-conditions-on-physical-and-chemical-properties-of-mta
#19
T Zarra, T Lambrianidis, L Vasiliadis, C Gogos
AIM: To evaluate setting time, pH, solubility and surface roughness of MTA+ and ProRoot MTA and characterize their hydration under several curing conditions. METHODOLOGY: Specimens were prepared to evaluate setting time (n=6 for each group, specimen dimensions 10x8x5mm), solubility (n=6 for each group, specimen dimension 20 mm in diameter and 1.5 mm thick) after 1 and 28 days, pH (n=10 for each group, specimen dimensions 10 mm in diameter and 1 mm thick) after 1, 7, 14, 21 and 28 days and surface roughness (n=10 for each group, specimen dimensions 4 mm in diameter and 3 mm high) after 28 days when cements were cured at 95% humidity or immersed in saline or HBSS at 37°C...
April 12, 2018: International Endodontic Journal
https://www.readbyqxmd.com/read/29628658/internal-tunneling-resorption-associated-with-invasive-cervical-resorption
#20
Pallav Mahesh Patni, Pradeep Jain, Sumeet Jain, Hemalatha Hiremath, Rolly Agarwal, Mona Jain Patni
Treating pathological defects that are caused by resorption in teeth can be challenging. The task is complicated further if the resorption extends beyond the restrains of the root. The aim of this report is to describe a case of extensive internal tunneling resorption (ITR) associated with invasive cervical resorption (ICR) in a maxillary right lateral incisor and its nonsurgical treatment. A 22-year-old male was referred to the department of endodontics with a chief complaint of discolored maxillary right lateral incisor or tooth 12 and a history of trauma...
January 2018: Journal of Conservative Dentistry: JCD
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