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https://www.readbyqxmd.com/read/29225643/cyclic-fatigue-resistance-of-waveone-gold-prodesign-r-and-prodesign-logic-files-in-curved-canals-in-vitro
#1
Sílvio Emanuel Acioly Conrado de Menezes, Shirley Machado Batista, Juliana Ouro Preto Lira, Gabriela Queiroz de Melo Monteiro
Introduction: Endodontic instruments are developed to provide a better cleaning of the root canal system and reduce its risk of fracture. The aim of this study was to evaluate the instrumentation time and cyclic fatigue resistance of WaveOne Gold, ProDesign R and ProDesign Logic files. Methods and Materials: Thirty Nickel-titanium (NiTi) rotary instruments were divided into 3 groups (n=10). ProDesign Logic file 25/0.06 was used in continuous rotation after glide path preparation...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29225642/comparison-of-apical-transportation-with-the-use-of-rotary-system-and-reciprocating-handpiece-with-precurved-hand-files-an-in-vitro-study
#2
Fatemeh Mohammadian, Atefeh Sadeghi, Fatemeh Dibaji, Mona Sadegh, Zahra Ghoncheh, Mohammad Javad Kharrazifard
Introduction: Success of root canal treatment depends on several factors; among which, maintaining the original canal path during mechanical preparation is extremely important. This in vitro study aimed to compare apical transportation using RaCe NiTi rotary system and precurved stainless steel (SS) hand files in a reciprocating handpiece. Methods and Materials: Mesiobuccal canals of 40 extracted human mandibular first and second molars with 20 to 45° curvatures and 3 to 7 mm curve radius were chosen for this study...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29225641/foramen-changes-following-over-instrumentation-of-curved-canals-with-three-engine-driven-instruments-an-in-vitro-study
#3
Salwa Yammine, Edgard Jabbour, Paul Nahas, Zeina Majzoub
Introduction: The present in vitro study aimed to evaluate and compare the changes in shape and surface area of the major foramen following shaping of curved canals with three new generation NiTi engine-driven instruments naming ProTaper Next, BT RaCe and WaveOne Gold- with 3 different levels of protrusion beyond the major apical foramen. Methods and Materials: A total of 45 extracted human molars with at least one curved canal were distributed in 3 comparable groups of 15 that were instrumented using either ProTaper Next (PTN), BT RaCe (BTR) or WaveOne Gold (WOG)...
2017: Iranian Endodontic Journal
https://www.readbyqxmd.com/read/29224951/design-and-synthesis-of-sulfonamidophenylethylureas-as-novel-cardiac-myosin-activator
#4
Manoj Manickam, Hitesh B Jalani, Thanigaimalai Pillaiyar, Pulla Reddy Boggu, Niti Sharma, Eeda Venkateswararao, You-Jung Lee, Eun-Seok Jeon, Min-Jeong Son, Sun-Hee Woo, Sang-Hun Jung
To optimize the lead urea scaffold 1 and 2 as selective cardiac myosin ATPase activator, a series of urea derivatives have been synthesized to explore its structure activity relationship. Among them N,N-dimethyl-4-(2-(3-(3-phenylpropyl)ureido)ethyl)benzenesulfonamide (13, CMA = 91.6%, FS = 17.62%; EF = 11.55%), N,N-dimethyl-4-(2-(1-methyl-3-(3-phenylpropyl)ureido)ethyl)benzene sulfonamide (40, CMA = 52.3%, FS = 38.96%; EF = 24.19%) and N,N-dimethyl-4-(2-(3-methyl-3-(3-phenylpropyl)ureido)ethyl)benzenesulfonamide (41, CMA = 47...
October 31, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29218785/increased-affinity-of-endothelial-cells-to-niti-using-ultraviolet-irradiation-an-in-vitro-study
#5
Satoshi Tateshima, Naoki Kaneko, Masahiro Yamada, Gary Duckwiler, Fernando Vinuela, Takahiro Ogawa
Nickel - Titanium alloy (NiTi) is one of the most popular materials used endovascularly because of its shape memory and superelasticity. The NiTi device needs to be covered by endothelial cells after being placed in the blood vessel to reduce ischemic complications. The objective of this study was to examine the impact of ultraviolet (UV) irradiation on the biocompatibility of NiTi surfaces with endothelial cells. NiTi sheets were treated with UV irradiation for 48 hours and human aorta derived endothelial cells were used in this study...
December 8, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/29215571/application-of-the-superelastic-niti-spring-in-ankle-foot-orthosis-afo-to-create-normal-ankle-joint-behavior
#6
Amirhesam Amerinatanzi, Hashem Zamanian, Narges Shayesteh Moghaddam, Ahmadreza Jahadakbar, Mohammad Elahinia
Hinge-based Ankle Foot Orthosis (HAFO) is one of the most common non-surgical solutions for the foot drop. In conventional HAFOs, the ankle joint is almost locked, and plantar flexion is restricted due to the high stiffness of the hinge mechanism. This often leads to a rigid walking gate cycle, poor muscle activity, and muscle atrophy. Since the ankle torque-angle loop has a non-linear profile, the use of a superelastic NiTi spring within the hinge, due to its nonlinear behavior, could recreate a close-to-normal stiffness of the normal ankle joint, which, in turn, could create a more natural walk...
December 7, 2017: Bioengineering
https://www.readbyqxmd.com/read/29208788/comparative-evaluation-of-cleaning-efficacy-using-four-novel-nickel-titanium-rotary-instruments-an-in-vitro-scanning-electron-microscope-study
#7
Prem P Kar, Sandhya A Khasnis, Krisnamurthy H Kidiyoor
AIM: The aim of the study was to compare the cleaning efficacy (debris and smear layer removal) of two multifile rotary systems (MTwo and Silk) and two single-file rotary systems (F6 Skytaper and NeoNiTi). MATERIALS AND METHODS: Eighty mesial canals of mandibular first molars were cleaned and shaped using four nickel-titanium (NiTi) rotary instruments to size # 25 and 3% NaOCl and 17% ethylenediaminetetraacetic acid (EDTA). Samples were randomly divided into four equal groups (n = 20) according to instrumentation: Group I, Mtwo; group II, Silk; group III, F6 Skytaper; group IV, NeoNiTi...
December 1, 2017: Journal of Contemporary Dental Practice
https://www.readbyqxmd.com/read/29205804/a-prospective-cohort-study-assessing-the-appearance-of-retrieved-aesthetic-orthodontic-archwires
#8
S Collier, N Pandis, A Johal, U Qureshi, P K Sharma, P S Fleming
OBJECTIVES: To investigate the appearance of three esthetic nickel titanium (NiTi) wires after 6 weeks of intra-oral cycling and to determine the association between objective and subjective measures of esthetics. SETTING AND SAMPLE POPULATION: A prospective cohort study was undertaken involving participants undergoing upper fixed orthodontic appliance treatment with ceramic brackets. MATERIALS AND METHODS: Fifty participants were assigned to one of three groups of NiTi esthetic wires (American Orthodontics Ever White™, Forestadent Biocosmetic™ and GAC High Aesthetic™), with wires retrieved after 6 weeks in situ...
December 4, 2017: Orthodontics & Craniofacial Research
https://www.readbyqxmd.com/read/29182860/investigating-pharmacological-targeting-of-g-quadruplexes-in-human-malaria-parasite
#9
Mohammad Anas, Richa Sharma, V Dhamodharan, Pushpangadan Indira Pradeepkumar, Ashan Manhas, Kumkum Srivastava, Shakil Ahmed, Niti Kumar
The unique occurrence of G-quadruplexes in AT-rich genome of human malaria parasite P. falciparum hint towards their critical roles in parasite survival, pathogenesis and host immune evasion. An intriguing question is whether these non-canonical structures can serve as molecular targets for small-molecule based interventions against malaria. In this study, we have investigated the pharmacological targeting of G-quadruplexes for parasite inhibition. We observed that bisquinolinium derivatives of 1,8-naphthyridine and pyridine affected the stability and molecular recognition properties of G-quadruplexes in telomeric and sub-telomeric regions in P...
November 28, 2017: Biochemistry
https://www.readbyqxmd.com/read/29178173/evaluation-of-apical-transportation-and-centering-ability-of-five-thermally-treated-niti-rotary-systems
#10
S R Pinheiro, M P Alcade, N Vivacqua-Gomes, C M Bramante, R R Vivan, M A H Duarte, B C Vasconcelos
AIM: To evaluate apical transportation and centring ability during root canal preparation in mesial root canals of mandibular molars associated with ProTaper Gold (PTG), ProDesign S (PDS), Hyflex CM (HCM), Hyflex EDM (HEDM) and ProDesign Logic (PDL). METHOD: Sixty first mandibular molars with two separete canals in the mesial root were selected after root anatomy pairing by microcomputed tomography (microCT). The teeth were randomly divided into 5 groups (n = 24); the root canal volume was calculated to ensure sample homogeneity...
November 27, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/29171880/torsional-fatigue-resistance-of-pathfinding-instruments-manufactured-from-several-niti-alloys
#11
M P Alcalde, M A H Duarte, C M Bramante, M Tanomaru-Filho, B C Vasconcelos, M V R Só, R R Vivan
AIM: To evaluate the torsional properties of pathfinding nickel-titanium (NiTi) rotary instruments manufactured from several NiTi alloys, ProGlider (M-wire), Hyflex GPF (conventional NiTi Wire and controlled memory wire), Logic (conventional NiTi wire and controlled memory wire) and Mtwo (conventional NiTi wire). METHODOLOGY: A total of 56 NiTi instruments from Glidepath rotary systems (n = 8) were used Logic (size 25, .01 taper), Logic CM (size 25, .01 taper), ProGlider (size 16, ...
November 24, 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/29160804/residual-endodontic-filling-material-after-post-space-preparation-a-confocal-microscopic-study
#12
Yu-Yao Teoh, Laurence J Walsh
This laboratory study assessed removability of endodontic alkaline cements and resin sealers using coronal cross-sectional slices of roots with single canals. Materials were labelled with 0.1% (w/w) sodium fluorescein prior to mixing so that confocal microscopy could be used to quantify material remaining on the walls of post spaces, to assess cleanliness. Roots of extracted teeth were prepared using rotary NiTi instruments then obturated using lateral condensation with gutta percha and epoxy resin sealers (AH-Plus™ or Zirmix™), or were filled by injecting mineral trioxide aggregate (MTA) cement (GC Nex™ MTA or MTAmix™) or a hard-setting calcium hydroxide cement (Supercal™)...
November 21, 2017: Materials
https://www.readbyqxmd.com/read/29160398/topographic-and-chemical-analysis-of-reciprocating-and-rotary-instruments-surface-after-continuous-use
#13
Mariana Mena Barreto Bastos, Aida Rene Assayag Hanan, Ana Mena Barreto Bastos, André Augusto Franco Marques, Lucas da Fonseca Roberti Garcia, Emílio Carlos Sponchiado
This study aimed at evaluating the changes in surface characteristics and NiTi content of reciprocating and rotary instruments after continuous use. Thirty brand-new instruments were assigned to 3 groups (n=10): PNX1 Group - ProTaper Next system - instrument X1; PNX2 Group - ProTaper Next system - instrument X2 and WO Group - WaveOne system - Primary instrument 25.08. The instruments were used to prepare 60 simulated root canals. Analysis of surface characteristics by scanning electron microscopy (SEM) and chemical analysis of Ni and Ti content by energy-dispersive spectroscopy (EDS) were performed before and after the first and third use of the instruments...
July 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/29153282/efficacy-of-elastic-memory-chains-versus-nickel-titanium-coil-springs-in-canine-retraction-a-two-center-split-mouth-randomized-clinical-trial
#14
Mashallah Khanemasjedi, Mehrnaz Moradinejad, Pedram Javidi, Ozra Niknam, Nima Haghighat Jahromi, Vahid Rakhshan
OBJECTIVE: The use of newly-introduced elastic memory chains (EMCs) in space closure is increasingly gaining popularity. However, no clinical studies have evaluated their efficacy. Therefore, this study was conducted. METHODS: In this two-center split-mouth single-blind randomized controlled trial, 21 jaws were divided into 42 quadrants. The two treatments [canine retraction using EMCs versus nickel-titanium (NiTi) coil springs (as control)] were randomly assigned to two quadrants of each jaw...
November 15, 2017: International Orthodontics
https://www.readbyqxmd.com/read/29142880/comparison-of-apical-extrusion-of-intracanal-bacteria-by-various-glide-path-establishing-systems-an-in-vitro-study
#15
Alberto Dagna, Rashid El Abed, Sameeha Hussain, Ibrahim H Abu-Tahun, Livia Visai, Federico Bertoglio, Floriana Bosco, Riccardo Beltrami, Claudio Poggio, Hyeon-Cheol Kim
Objectives: This study compared the amount of apically extruded bacteria during the glide-path preparation by using multi-file and single-file glide-path establishing nickel-titanium (NiTi) rotary systems. Materials and Methods: Sixty mandibular first molar teeth were used to prepare the test apparatus. They were decoronated, blocked into glass vials, sterilized in ethylene oxide gas, infected with a pure culture of Enterococcus faecalis, randomly assigned to 5 experimental groups, and then prepared using manual stainless-steel files (group KF) and glide-path establishing NiTi rotary files (group PF with PathFiles, group GF with G-Files, group PG with ProGlider, and group OG with One G)...
November 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29142878/the-effects-of-autoclave-sterilization-on-the-cyclic-fatigue-resistance-of-protaper-universal-protaper-next-and-protaper-gold-nickel-titanium-instruments
#16
Taha Özyürek, Koray Yılmaz, Gülşah Uslu
Objectives: It was aimed to compare the cyclic fatigue resistances of ProTaper Universal (PTU), ProTaper Next (PTN), and ProTaper Gold (PTG) and the effects of sterilization by autoclave on the cyclic fatigue life of nickel-titanium (NiTi) instruments. Materials and Methods: Eighty PTU, 80 PTN, and 80 PTG were included to the present study. Files were tested in a simulated canal. Each brand of the NiTi files were divided into 4 subgroups: group 1, as received condition; group 2, pre-sterilized instruments exposed to 10 times sterilization by autoclave; group 3, instruments tested were sterilized after being exposed to 25%, 50%, and 75% of the mean cycles to failure, then cycled fatigue test was performed; group 4, instruments exposed to the same experiment with group 3 without sterilization...
November 2017: Restorative Dentistry & Endodontics
https://www.readbyqxmd.com/read/29137138/metabolic-profile-of-the-cellulolytic-industrial-actinomycete-thermobifida-fusca
#17
Niti Vanee, J Paul Brooks, Stephen S Fong
Actinomycetes have a long history of being the source of numerous valuable natural products and medicinals. To expedite product discovery and optimization of biochemical production, high-throughput technologies can now be used to screen the library of compounds present (or produced) at a given time in an organism. This not only facilitates chemical product screening, but also provides a comprehensive methodology to the study cellular metabolic networks to inform cellular engineering. Here, we present some of the first metabolomic data of the industrial cellulolytic actinomycete Thermobifida fusca generated using LC-MS/MS...
November 11, 2017: Metabolites
https://www.readbyqxmd.com/read/29136578/deformation-mechanisms-of-prototype-composite-braided-stent-grafts-in-bending-fatigue-for-peripheral-artery-application
#18
Wen Xue, Jing Gao, Jing Lin, Fujun Wang, Guoping Guan, Lu Wang
Stent-grafts in peripheral arteries suffer from complex cyclic loadings in vivo, including pulsatile, axial bending and torsion. Normal fatigue durability evaluation technologies, however, are majorly based on pulsation and thus are short of accuracy under the complicated stress conditions experienced physiologically. While there is a little research focused on the cyclic fatigue of stent-grafts in bending, it remains an almost total lack of deformation or fatigue mechanisms. In this work, composite braided stent-grafts incorporating Nitinol (NiTi) yarns and polyethylene terephthalate (PET) multifilament yarns were cycled in bending by the self-developed testing system to investigate their deformation behaviors...
October 31, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29122074/cone-beam-computed-tomography-evaluation-of-hand-nickel-titanium-k-files-and-rotary-system-in-primary-teeth
#19
Etta Radhika, E Rajendra Reddy, S Thabitha Rani, Labishetty Vinay Kumar, M Manjula, Tulluru Ajay Mohan
PURPOSE: The purpose of this study was to compare canal transportation, centering ability, and removed dentin thickness (RDT) using hand nickel-titanium (NiTi) K-flex files and rotary systems in primary molars and using cone beam computed tomography (CBCT). METHODS: This study was conducted on 20 primary maxillary and 20 primary mandibular molars, which were randomly divided into two groups to be instrumented with hand NiTi K-flex files and a rotary system. Pre- and post-instrumentation slices were taken at three predetermined levels using CBCT to evaluate all the parameters by using Digital Imaging Communications in Medicine (DICOM) software...
July 15, 2017: Pediatric Dentistry
https://www.readbyqxmd.com/read/29114332/molar-uprighting-a-considerable-and-safe-decision-to-avoid-prosthetic-treatment
#20
Taísa Boamorte Raveli, Dirceu Barnabé Raveli, Kelei Cristina de Mathias Almeida, Ary Dos Santos Pinto
Background: Tipped lower molar over edentulous space is very common in orthodontics practice when adults seek treatment. The segmented arch technique features a predictable force system that provides a controlled release of force that can produce light and continuous tooth movement. Case Description: A female adult patient, who lost a permanent lower first molar, needed correction of the position of her permanent first molar place. Instead of making space for rehabilitation, it was closed after second molar uprighting and a balanced interdigitation was created without prosthetics...
2017: Open Dentistry Journal
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