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https://www.readbyqxmd.com/read/28185092/thermal-analysis-and-stability-of-commercially-available-endodontic-obturation-materials
#1
H W Roberts, T C Kirkpatrick, B E Bergeron
OBJECTIVES: The purpose of this study was to evaluate the thermal stability of 23 commercially-available endodontic obturation materials. MATERIALS AND METHODS: Specimens (n = 10) were sealed in aluminum differential scanning calorimetry (DSC) crucibles and subjected to thermal scan series consisting of a 25 to 70 °C at 5 °C/min followed by a rapid increase to 230 °C, followed by a second scan from 25 to 70 °C at 5 °C/min. The first scan evaluated the materials as-received followed by a worse-case-scenario thermal challenge simulating temperatures involved with warm vertical condensation obturation techniques...
February 10, 2017: Clinical Oral Investigations
https://www.readbyqxmd.com/read/28154314/effectiveness-of-x-ray-computed-microtomography-to-determine-structureproperty-relationships-of-gutta-percha
#2
Liudi Zhang, Christopher Joubert, George Bruder, Kai Yang, Alexa Aseel-Fine, Keith Jones, Miriam Rafailovich
We have shown that Computed Microtomography (CMT) is able to map the internal distribution of the filler particles in ProTaper(TM), Lexicon(TM), and GuttaCore(TM) materials, and explain the differences in their tensile and ductility properties, prior to mechanical manipulation. Working of uncrosslinked ProTaper™ and Lexicon(TM) samples resulted in a five-fold increase in ductility and the tensile elongation at break. CMT mapping of the internal structure showed that large, periodic, striations formed across the interior of the sample corresponding to the formation of regions with low filler particle density...
February 1, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28149464/sealing-efficacy-of-system-b-versus-thermafil-and-guttacore-obturation-techniques-evidenced-by-scintigraphic-analysis
#3
Manuel Marques-Ferreira, Margarida Abrantes, Hugo-Diogo Ferreira, Francisco Caramelo, Maria-Filomena Botelho, Eunice-Virgínia Carrilho
BACKGROUND: This study compared root canal sealing ability, filled by Continuous Wave compaction and two carrier-based obturation systems, using the nuclear medicine approach. MATERIAL AND METHODS: Fifty-five single-rooted extracted teeth were selected. The crowns were sectioned and each tooth was instrumented using rotary Protaper® Universal system. The roots were divided into 3 experimental groups and two control groups. Forty-five root canals were filled, using Continuous Wave, GuttaCore or Thermafil system and TopSeal sealer...
January 2017: Journal of Clinical and Experimental Dentistry
https://www.readbyqxmd.com/read/28149450/quantitative-volumetric-analysis-of-cross-linked-gutta-percha-obturators
#4
Carla Zogheib, Monique Hanna, Damiano Pasqualini, Alfred Naaman
AIM: The purpose of this study was to evaluate the effects of technique on the filling quality of 2 recently introduced obturation systems comparatively with warm vertical compaction using micro-computed tomography. METHODS: 36 single-rooted teeth were selected, root canals prepared, and assigned to 3 groups (n=12), according to the filling technique: warm vertical compaction technique WVC, GuttaCore (Dentsply Tulsa Dental Specialties, Tulsa, OK) and Gutta Fusion (VDW, Germany)...
July 2016: Annali di Stomatologia
https://www.readbyqxmd.com/read/27689844/micro-ct-assessment-of-dentinal-micro-cracks-after-root-canal-filling-procedures
#5
G De-Deus, F G Belladonna, E J N L Silva, E M Souza, J C A Carvalhal, R Perez, R T Lopes, M A Versiani
AIM: To evaluate the frequency of dentinal micro-cracks after root canal filling procedures with GuttaCore (GC), cold lateral compaction (CLC) and warm vertical compaction (WVC) techniques in mandibular molars using micro-computed tomographic analysis. METHODOLOGY: Thirty mesial roots of mandibular molars, with a type II Vertucci's canal configuration, were prepared to working length with a Reciproc R40 instrument and randomly assigned to one of 3 experimental groups (n = 10), according to the technique used for root filling: GC, CLC or WVC...
September 30, 2016: International Endodontic Journal
https://www.readbyqxmd.com/read/27041355/experimental-polyethylene-hydroxyapatite-carrier-based-endodontic-system-an-in-vitro-study-on-dynamic-thermomechanical-properties-sealing-ability-and-measurements-of-micro-computed-tomography-voids
#6
Raghad A Alhashimi, Francesco Mannocci, Salvatore Sauro
The dynamic thermomechanical properties, sealing ability, and voids formation of an experimental obturation hydroxyapatite-reinforced polyethylene (HA/PE) composite/carrier system were investigated and compared with those of a commercial system [GuttaCore (GC)]. The HA/PE system was specifically designed using a melt-extrusion process. The viscoelastic properties of HA/PE were determined using a dynamic thermomechanical analyser. Human single-rooted teeth were endodontically instrumented and obturated using HA/PE or GC systems, and then sealing ability was assessed using a fluid filtration system...
June 2016: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/26865499/micro-computed-tomography-analysis-of-post-space-preparation-in-root-canals-filled-with-carrier-based-thermoplasticized-gutta-percha
#7
A A Schroeder, N L Ford, J M Coil
AIM: To determine whether post space preparation deviated from the root canal preparation in canals filled with Thermafil, GuttaCore or warm vertically compacted gutta-percha. METHODOLOGY: Forty-two extracted human permanent maxillary lateral incisors were decoronated, and their root canals instrumented using a standardized protocol. Samples were divided into three groups and filled with Thermafil (Dentsply Tulsa Dental Specialties, Johnson City, TN, USA), GuttaCore (Dentsply Tulsa Dental Specialties) or warm vertically compacted gutta-percha, before post space preparation was performed with a GT Post drill (Dentsply Tulsa Dental Specialties)...
March 2017: International Endodontic Journal
https://www.readbyqxmd.com/read/26679718/percentage-of-gutta-percha-filled-areas-in-canals-obturated-with-cross-linked-gutta-percha-core-carrier-systems-single-cone-and-lateral-compaction-technique
#8
Edgar Schäfer, Caroline Schrenker, Jonas Zupanc, Sebastian Bürklein
INTRODUCTION: The aim of this study was to compare different obturation techniques in terms of the percentage of gutta-percha filled areas (PGFA), sealer filled areas (PSFA), and voids in straight root canals prepared with different instruments. METHODS: One hundred sixty extracted single-rooted mandibular premolars with straight canals were allocated into 10 groups (n = 16 teeth per group): A, manual instrumentation + lateral compaction (LC); B, Mtwo + GuttaFusion (GF); C, Mtwo + LC; D, Mtwo + single-cone (SC); E, Reciproc + GF; F, Reciproc + LC; G, Reciproc + SC; H, WaveOne + GuttaCore (GC); I, WaveOne + LC; and J, WaveOne + SC...
February 2016: Journal of Endodontics
https://www.readbyqxmd.com/read/26679336/is-guttacore-more-easily-removed-from-the-root-canal-than-thermafil-an-ex-vivo-study
#9
Giselle Nevares, Diana Santana de Albuquerque, Carlos Eduardo da Silveira Bueno, Rodrigo Sanches Cunha
GuttaCore is a new cross-linked gutta-percha carrier. Its handling time and ease of removal were compared with those of a plastic carrier (Thermafil) and the continuous wave of condensation technique (control). Forty-five maxillary central incisors were randomly divided 3 groups according to filling technique and retreatment was carried out in all samples with NiTi rotary files, hand files and ultrasonic inserts. Time required for filling removal was recorded. Roots were then split longitudinally and photographed under 5x magnification, and residual filling material was quantified...
2015: Journal—Canadian Dental Association, Journal de L'Association Dentaire Canadienne
https://www.readbyqxmd.com/read/26114421/comparison-of-bacterial-leakage-resistance-of-various-root-canal-filling-materials-and-methods-confocal-laser-scanning-microscope-study
#10
Ji Hee Hwang, Jin Chung, Hee-Sam Na, Eunjoo Park, Sangwon Kwak, Hyeon-Cheol Kim
This study evaluated the bacterial leakage resistance and root canal lining efficacy of various root canal filling materials and methods by using confocal laser-scanning microscope (CLSM). Sixty extracted human premolars with mature apex and single root canal were randomly divided into 2 control groups and 4 experimental groups. Group CW was filled with continuous wave technique using gutta-percha and AH Plus sealer. Group GC was coated with AH-Plus sealer and then obturated with soften GuttaCore. Group GF was obturated using GuttaFlow and gutta-percha...
November 2015: Scanning
https://www.readbyqxmd.com/read/25447499/the-effect-of-canal-preparation-on-fill-length-in-straight-root-canals-obturated-with-guttacore
#11
Robert B Whitten, Marc E Levitan
INTRODUCTION: A common critique of using thermoplasticized carrier-based obturators is the incidence of overextension. It would be of benefit to clinicians to have a technique for canal preparation that would allow for predictable length control. This study compared straight canals instrumented to a size 40 file using a 0.04 standardized taper preparation (STP) and a varied taper preparation (VTP) by evaluating the extension of GuttaCore (GC) obturators (Dentsply Tulsa Dental, Tulsa, OK)...
February 2015: Journal of Endodontics
https://www.readbyqxmd.com/read/25443281/accuracy-of-an-electronic-apex-locator-in-the-retreatment-of-teeth-obturated-with-plastic-or-cross-linked-gutta-percha-carrier-based-materials-an-ex-vivo-study
#12
COMPARATIVE STUDY
Manuele Mancini, Pietro Palopoli, Lorenzo Iorio, Gabriele Conte, Luigi Cianconi
INTRODUCTION: This ex vivo study evaluated the accuracy of the Root ZX electronic apex locator (EAL) (J Morita Corp, Kyoto, Japan) in determining the working length during retreatment of canals sealed with 2 different carrier-based obturating materials (ProTaper Obturator [Dentsply Maillefer, Ballaigues, Switzerland] and GuttaCore [Dentsply Maillefer]) and also evaluated whether they influenced its accuracy differently. METHODS: Fifty extracted single-rooted human teeth with sound apices were selected for the study...
December 2014: Journal of Endodontics
https://www.readbyqxmd.com/read/24987727/an-in-vitro-assessment-of-gutta-percha-coating-of-new-carrier-based-root-canal-fillings
#13
Raghad Abdulrazzaq Alhashimi, Richard Foxton, Shihab Romeed, Sanjukta Deb
The first aim of this paper was to evaluate the push-out bond strength of the gutta-percha coating of Thermafil and GuttaCore and compare it with that of gutta-percha used to coat an experimental hydroxyapatite/polyethylene (HA/PE) obturator. The second aim was to assess the thickness of gutta-percha around the carriers of GuttaCore and HA/PE obturators using microcomputed tomography ( μ CT). Ten (size 30) 1 mm thick samples of each group (Thermafil, GuttaCore, and HA/PE) were prepared. An orthodontic wire with a diameter of 0...
2014: TheScientificWorldJournal
https://www.readbyqxmd.com/read/24769108/quality-of-obturation-achieved-by-an-endodontic-core-carrier-system-with-crosslinked-gutta-percha-carrier-in-single-rooted-canals
#14
COMPARATIVE STUDY
Guo-Hua Li, Li-Na Niu, Lisa C Selem, Ashraf A Eid, Brian E Bergeron, Ji-Hua Chen, David H Pashley, Franklin R Tay
OBJECTIVES: The present study examined the quality of obturation in root canals obturated by GuttaCore, a gutta-percha-based core-carrier system with a cross-linked thermoset gutta-percha carrier, by comparing the incidence of gaps and voids identified from similar canals obturated by cold lateral compaction or warm vertical compaction. METHODS: Thirty single-rooted premolars with oval-shaped canals were shaped and cleaned, and obturated with one of the three obturation techniques (N=10): GuttaCore, warm vertical compaction or cold lateral compaction...
September 2014: Journal of Dentistry
https://www.readbyqxmd.com/read/23228271/time-required-to-remove-guttacore-thermafil-plus-and-thermoplasticized-gutta-percha-from-moderately-curved-root-canals-with-protaper-files
#15
RANDOMIZED CONTROLLED TRIAL
Robert T Beasley, Anne E Williamson, Bruce C Justman, Fang Qian
INTRODUCTION: A novel carrier-based obturation system, GuttaCore, was developed to facilitate more efficient nonsurgical retreatments. This ex vivo study evaluated the time required for re-treating GuttaCore and 2 other common obturation materials in moderately curved canals with ProTaper retreatment and ProTaper files. METHODS: Sixty mesial roots of mandibular molars with the same mean curvature were randomly divided into 3 experimental groups: warm vertical, Thermafil Plus, and GuttaCore...
January 2013: Journal of Endodontics
https://www.readbyqxmd.com/read/6010242/-the-treatment-of-heart-diseases-from-various-causes-with-the-combination-preparation-spasmo-guttacor
#16
H Wimmer, K Spesshardt
No abstract text is available yet for this article.
September 10, 1966: Die Medizinische Welt
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