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https://www.readbyqxmd.com/read/28335281/study-on-utilization-of-carboxyl-group-decorated-carbon-nanotubes-and-carbonation-reaction-for-improving-strengths-and-microstructures-of-cement-paste
#1
Xiantong Yan, Hongzhi Cui, Qinghua Qin, Waiching Tang, Xiangming Zhou
Carbon nanotubes (CNTs) have excellent mechanical properties and can be used to reinforce cement-based materials. On the other hand, the reaction product of carbonation with hydroxides in hydrated cement paste can reduce the porosity of cement-based materials. In this study, a novel method to improve the strength of cement paste was developed through a synergy of carbon nanotubes decorated with carboxyl group and carbonation reactions. The experimental results showed that the carboxyl group (-COOH) of decorated carbon nanotubes and the surfactant can control the morphology of the calcium carbonate crystal of carbonation products in hydrated cement paste...
August 19, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28327693/single-versus-two-visits-with-1-week-intracanal-calcium-hydroxide-medication-for-endodontic-treatment-one-year-post-treatment-results-from-a-multicentre-randomised-controlled-trial
#2
Federica Fonzar, Aniello Mollo, Mauro Venturi, Pierpaolo Pini, Riccardo Fabian Fonzar, Anna Trullenque-Eriksson, Marco Esposito
PURPOSE: To evaluate whether it is more effective to complete endodontic treatment in a single visit or in two visits with 1-week intracanal calcium hydroxide medication in symptomatic teeth and teeth with periapical lesions. MATERIALS AND METHODS: One hundred and ninety-nine patients, with one symptomatic tooth or a tooth with a periapical lesion, were randomised, according to a parallel group design, to receive a complete endodontic treatment in a single visit (99 patients) or in two visits with 1-week intracanal calcium hydroxide medication (100 patients), at two centres...
2017: European Journal of Oral Implantology
https://www.readbyqxmd.com/read/28316920/measurement-of-ph-and-calcium-ions-release-from-different-calcium-hydroxide-pastes-at-different-intervals-of-time-atomic-spectrophotometric-analysis
#3
Pranab Misra, Rhythm Bains, Kapil Loomba, Abhinav Singh, V P Sharma, R C Murthy, Rakesh Kumar
AIM: To evaluate the effect of different vehicles on pH and release of calcium ions from calcium hydroxide (CH) paste from apical third of root canals. METHODS: 40 single rooted extracted human mandibular premolars were instrumented with RevoS files (MicroMega) up to ISO size 40. The teeth were divided into 4 groups on the basis of vehicle as follows: Group I - calcium hydroxide mixed with 2% chlorhexidine; Group II - calcium hydroxide mixed with propylene glycol; Group III - calcium hydroxide mixed with glycerine; and Control - calcium hydroxide mixed with double distilled water...
January 2017: Journal of Oral Biology and Craniofacial Research
https://www.readbyqxmd.com/read/28301017/intracanal-irrigating-solutions-prior-to-calcium-hydroxide-medication-and-its-effects-on-root-dentin-strength
#4
Leila Clarisse Hillesheim, Juliara Bellina Hoffmann, Daniela Peressoni Vieira Schuldt, Maybell Tedesco, Eduardo Antunes Bortoluzzi, Cleonice Silveira Teixeira
The aim of this study was to assess the effects of intracanal irrigation with sodium hypochlorite (NaOCl) and ethylenediaminetetracetic acid (EDTA) prior to calcium hydroxide medication on the compressive strength of root dentin. Forty-eight roots with single and straight canals were instrumented with a crown-down technique using Flexofile files and Gates Glidden burs, under 0.9% sodium chloride (NaCl) irrigation. Root canals were randomly separated into 4 groups (n=12), according to the irrigating solution: Control Group, 0...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28299554/comparison-of-different-techniques-for-removal-of-calcium-hydroxide-from-straight-root-canals-an-in-vitro-study
#5
Anne-Kathrin Pabel, Michael Hülsmann
To compare four different techniques for removal of calcium hydroxide from straight root canals. The present study used the design suggested by Lee et al. (Int Endod J 37:607-612, 32) and van der Sluis et al. (Int Endod J 40:52-57, 17). One-hundred and ten extracted human teeth with straight root canals were prepared to ISO-size 50 and split longitudinally. Two lateral grooves were prepared, filled with calcium hydroxide and the root halves reassembled in a muffle. Calcium hydroxide was removed using one of five techniques: (1) passive ultrasonic irrigation, (2) hydrodynamic irrigation using RinsEndo(®), (3) sonic irrigation using the EndoActivator(®), (4) motor-driven plastic brush (CanalBrush™), and (5) manual irrigation with a syringe as the control group...
March 15, 2017: Odontology
https://www.readbyqxmd.com/read/28294706/histopathological-microbiological-and-radiographic-analysis-of-antimicrobial-photodynamic-therapy-for-the-treatment-of-teeth-with-apical-periodontitis-a-study-in-rats-molars
#6
Alessandra Cesar Trindade, José Antônio Poli de Figueiredo, Sílvia Dias de Oliveira, Valdir Cristóvão Barth Junior, Stephanie Wagner Gallo, Carina Follmann, Carlos Frederico Brilhante Wolle, Liviu Steier, Renata Dornelles Morgental, João Batista Blessmann Weber
OBJECTIVE: The aim of this study was to evaluate in vivo, by histological and radiographic analysis, the response of apical tissues of rats' teeth with experimentally induced apical periodontitis, after one- and two-session endodontic treatment with and without photodynamic therapy (PDT). A microbiological analysis was also performed to verify bacterial reduction after each treatment. BACKGROUND DATA: Studies carried out in recent years highlighted the antibacterial potential of PDT when associated with conventional endodontic therapy in vitro...
March 9, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28293665/comparison-of-endodontic-medicaments-on-bond-strength-of-fiber-post-to-root-dentin-using-resin-cement
#7
Maryam Zare Jahromi, Mehrdad Barekatain, Shirin Ravanbod, Parisa Ranjbarian, Sara Kousehlar
STATEMENT OF THE PROBLEM: Endodontic irrigants and medicaments may affect the bond strength of intracanal posts to root dentin. PURPOSE: The aim of this study was to compare the effect of calcium hydroxide (Ca(OH)2) and 2% chlorhexidine gel (CHX) on bond strength of fiber post cemented with resin cement to root dentin. MATERIALS AND METHOD: This in vitro experimental study was conducted on 36 mandibular premolars. Canals were prepared using the step back technique...
March 2017: Journal of Dentistry
https://www.readbyqxmd.com/read/28292596/why-biphasic-assessment-of-the-effect-on-cell-proliferation-and-expression
#8
Pierre Schembri-Wismayer, Josette Camilleri
INTRODUCTION: Tricalcium silicate (TCS)-based materials are used in endodontics because they are hydraulic and interact with blood, tissue fluids, and phosphate-based root canal irrigants, resulting in biomineralization. Newer-generation materials are biphasic; calcium phosphate is added to the TCS; thus, the material has 2 cementitious phases. The effect of this addition is not known; thus, the aim of this study was to characterize biphasic cements and assess cellular proliferation and expression...
March 11, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28292338/antibacterial-effect-of-calcium-hydroxide-with-or-without-chlorhexidine-as-intracanal-dressing-in-primary-teeth-with-apical-periodontitis
#9
Lea A B Silva, Priscilla C Romualdo, Raquel A B Silva, Maria C M Souza-Gugelmin, Luciana C Pazelli, Aldevina C De Freitas, Gisele Faria, Paulo Nelson-Filho
PURPOSE: The purpose of this study was to evaluate in vivo the antibacterial effect of calcium hydroxide (CH) dressings, with or without chlorhexidine (CHX), on human primary teeth with apical periodontitis. METHODS: Forty root canals in 40 children were selected. A first microbiological sample was obtained after coronal opening, and the teeth were randomly assigned to Group 1 (root canals filled with CH paste) and Group 2 (CH paste plus 1.0 percent CHX). After 30 days, the dressing was removed and the canals were allowed to remain empty for 72 hours...
January 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28292337/primary-tooth-vital-pulp-therapy-a-systematic-review-and-meta-analysis
#10
James A Coll, N Sue Seale, Kaaren Vargas, Abdullah A Marghalani, Shahad Al Shamali, Laurel Graham
PURPOSE: This systematic review and meta-analysis assessed outcomes in primary teeth for the vital pulp therapy (VPT) options of indirect pulp therapy (IPT), direct pulp capping (DPC), and pulpotomy after a minimum of 12 months to determine whether one VPT was superior. METHODS: The following databases were searched from 1960 to September 2016: MEDLINE, EMBASE, CENTRAL, EBSCO, ICTRP, Dissertation abstracts, and grey literature for parallel and split-mouth randomized controlled trials of at least 12 months duration comparing the success of IPT, DPC, and pulpotomy in children with deep caries in primary teeth...
January 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28292334/in-vivo-effect-of-calcium-hydroxide-and-resin-modified-glass-ionomer-cement-on-carious-dentin-in-young-permanent-molars-an-ultrastructural-and-macroscopic-study
#11
Shireen Opal, Shalini Garg, Deepak Sharma, Abhishek Dhindsa, Isha Jatana
PURPOSE: The purpose of this study was to evaluate macroscopically and ultrastructurally the effect of calcium hydroxide cement (CH) and resin-modified glass ionomer cement (RMGIC) compared with gutta percha (control) as a lining material on carious dentin after partial caries removal and sealing. METHODS: Twenty-seven permanent molars with deep carious lesions underwent partial caries removal with the application of CH, RMGIC, or gutta percha (control) and were then sealed for three months...
January 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/28287605/two-way-valorization-of-blast-furnace-slag-synthesis-of-precipitated-calcium-carbonate-and-zeolitic-heavy-metal-adsorbent
#12
Evangelos Georgakopoulos, Rafael M Santos, Yi Wai Chiang, Vasilije Manovic
The aim of this work is to present a zero-waste process for storing CO2 in a stable and benign mineral form while producing zeolitic minerals with sufficient heavy metal adsorption capacity. To this end, blast furnace slag, a residue from iron-making, is utilized as the starting material. Calcium is selectively extracted from the slag by leaching with acetic acid (2 M CH3COOH) as the extraction agent. The filtered leachate is subsequently physico-chemically purified and then carbonated to form precipitated calcium carbonate (PCC) of high purity (<2 wt% non-calcium impurities, according to ICP-MS analysis)...
February 21, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28287572/rapid-mix-preparation-of-bioinspired-nanoscale-hydroxyapatite-for-biomedical-applications
#13
Caroline J Wilcock, Piergiorgio Gentile, Paul V Hatton, Cheryl A Miller
Hydroxyapatite (HA) has been widely used as a medical ceramic due to its good biocompatibility and osteoconductivity. Recently there has been interest regarding the use of bioinspired nanoscale hydroxyapatite (nHA). However, biological apatite is known to be calcium-deficient and carbonate-substituted with a nanoscale platelet-like morphology. Bioinspired nHA has the potential to stimulate optimal bone tissue regeneration due to its similarity to bone and tooth enamel mineral. Many of the methods currently used to fabricate nHA both in the laboratory and commercially, involve lengthy processes and complex equipment...
February 23, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28285221/preeminent-productivity-of-1-3-propanediol-by-clostridium-butyricum-jkt37-and-the-role-of-using-calcium-carbonate-as-ph-neutraliser-in-glycerol-fermentation
#14
Zhao Kang Tee, Jamaliah Md Jahim, Jian Ping Tan, Byung Hong Kim
Calcium carbonate was evaluated as a replacement for the base during the fermentation of glycerol by a highly productive strain of 1,3-propanediol (PDO), viz., Clostridium butyricum JKT37. Due to its high specific growth rate (µmax=0.53h(-1)), 40g/L of glycerol was completely converted into 19.6g/L of PDO in merely 7h of batch fermentation, leaving only acetate and butyrate as the by-products. The accumulation of these volatile fatty acids was circumvented with the addition of calcium carbonate as the pH neutraliser before the fermentation was inoculated...
March 1, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28283090/cytotoxicities-and-genotoxicities-of-cements-based-on-calcium-silicate-and-of-dental-formocresol
#15
Hyunjung Ko, Youngdan Jeong, Miri Kim
Increasing interest is being paid to the toxicities of dental materials. The purpose of this study was to determine the cytotoxicities and genotoxicities of endodontic compounds to Chinese hamster ovary (CHO-K1) reproductive cells. Cultured CHO-K1 cells were treated with dental formocresol, two types of calcium hydroxide paste, and two types of mineral trioxide aggregate cement for 24h. A 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay was performed on each culture, and the micronucleus frequency was determined by performing a micronucleus assay...
March 2017: Mutation Research
https://www.readbyqxmd.com/read/28274050/effect-of-calcium-hydroxide-based-intracanal-medicaments-on-the-apical-sealing-ability-of-resin-based-sealer-and-guttapercha-obturated-root-canals
#16
Rithima R Sokhi, M V Sumanthini, Vanitha U Shenoy, Mohit A Bodhwani
INTRODUCTION: Calcium Hydroxide (CH) is one of the most commonly used intracanal medicaments which can be used with various vehicles. AIM: The aim of this in vitro study was to evaluate the effect of three CH based intracanal medicaments on the apical sealing ability of AH Plus - guttapercha obturation. MATERIALS AND METHODS: Crowns of 100 extracted single rooted human teeth were sectioned at the Cemento-Enamel Junction (CEJ) to a standardized length...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28274034/efficacy-of-triple-antibiotic-paste-moxifloxacin-calcium-hydroxide-and-2-chlorhexidine-gel-in-elimination-of-e-faecalis-an-in-vitro-study
#17
Ashik Ali Lakhani, K S Sekhar, Pankaj Gupta, Bellam Tejolatha, Anjali Gupta, Shruti Kashyap, Veena Desai, Shanin Farista
INTRODUCTION: Root canal treatment is incomplete without usage of intra canal medicaments. They help in the reduction of bacterial count and its by-products, making canals clean and decreasing postoperative pains. AIM: The aim of this study was to evaluate and compare the antimicrobial activity of triple antibiotic paste, Moxifloxacin, calcium hydroxide and 2% Chlorhexidine (CHX) gel in elimination of Enterococcous faecalis (E. faecalis). MATERIALS AND METHODS: Seventy-five root blocks were obtained from extracted single rooted human teeth...
January 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28264708/effectiveness-of-persea-major-kopp-lauraceae-extract-against-enterococcus-faecalis-a-preliminary-in-vitro-study
#18
Lusiane Volpato, Marilisa Carneiro Leão Gabardo, Denise Piotto Leonardi, Paulo Henrique Tomazinho, Leila Teresinha Maranho, Flares Baratto-Filho
BACKGROUND: Persea major Kopp (Lauraceae) is a plant with wound healing, antibacterial, and analgesic properties. The aim of this study was to assess the in vitro antibacterial activity of the concentrated crude extract (CCE) and ethyl acetate fraction (EAF) of this plant against Enterococcus faecalis and compare it with calcium hydroxide [Ca(OH)2] paste and 2% chlorhexidine digluconate (CHX). METHODS: The plant material was collected, and an extract was prepared according to the requirements of the study (CCE and EAF)...
March 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28258273/additive-and-reducing-effects-between-calcium-hydroxide-and-current-irrigation-solutions
#19
Zahed Mohammadi, Hamid Jafarzadeh, Sousan Shalavi, Rasoul Sahebalam, Jun Ichiro Kinoshita
Microorganisms should be considered to have the major role in starting and perpetuation of pulpo-periapical diseases. Using intracanal medicaments is necessary to gain a bacteria-free environment in the canal system. Calcium hydroxide (abbreviated as Ca(OH)2), which is the most commonly used medicament in endodontic therapy, has been shown to be effective against primary sources of infection; however, its effectiveness against some microorganisms, such as Candida albicans and Enterococcus faecalis has not been proved...
March 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/28253279/demineralized-bone-matrix-used-for-direct-pulp-capping-in-rats
#20
Qian Liu, Yanhong Ma, Junlan Wang, Xuefang Zhu, Yanjing Yang, Yufeng Mei
OBJECTIVES: To evaluate the wound healing process following direct pulp capping with demineralized bone matrix (DBM) and calcium hydroxide (Ca(OH)2). METHODS: Fifty 8-weeks-old SPF Wistar male rats were divided into two groups: one was the DBM treated group, and the other was the Ca(OH)2 treated group. Pulpotomy was performed on the maxillary first molar of one side of each rat, and the another side was left as the blank control. Rats were sacrificed after each observation period (1, 3, 7, 14 and 28 days) and specimen slices were made...
2017: PloS One
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