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Root canal system

Taha Özyürek, Vildan Tek, Koray Yılmaz, Gülşah Uslu
Objectives: To determine the incidence of crack formation and propagation in apical root dentin after retreatment procedures performed using ProTaper Universal Retreatment (PTR), Mtwo-R, ProTaper Next (PTN), and Twisted File Adaptive (TFA) systems. Materials and Methods: The study consisted of 120 extracted mandibular premolars. One millimeter from the apex of each tooth was ground perpendicular to the long axis of the tooth, and the apical surface was polished...
November 2017: Restorative Dentistry & Endodontics
Su-Jin Jeon, Young-Mi Moon, Min-Seock Seo
Objectives: The aims of this study were to quantify tug-back by measuring the pulling force and investigate the correlation of clinical tug-back pulling force with in vitro gutta-percha (GP) cone adaptation score using micro-computed tomography (µCT). Materials and Methods: Twenty-eight roots from human single-rooted teeth were divided into 2 groups. In the ProTaper Next (PTN) group, root canals were prepared with PTN, and in the ProFile (PF) group, root canals were prepared using PF (n = 14)...
November 2017: Restorative Dentistry & Endodontics
Pietro Ausiello, Stefano Ciaramella, Massimo Martorelli, Antonio Lanzotti, Fernando Zarone, David C Watts, Antonio Gloria
OBJECTIVE: To assess the effect of a ferrule design with specific post material-shape combinations on the mechanical behavior of post-restored canine teeth. METHODS: Micro-CT scan images of an intact canine were used to create a 3-D tessellated CAD model, from which the shapes of dentin, pulp and enamel were obtained and geometric models of post-endodontically restored teeth were created. Two types of 15mm post were evaluated: a quartz fiber post with conical-tapered shape, and a carbon (C) fiber post with conical-cylindrical shape...
November 7, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
Abbasali Khademi, Mojdeh Mehdizadeh, Maryam Sanei, Hamidreza Sadeqnejad, Saber Khazaei
Background: Different techniques are used to evaluate the anatomy of root canal system. The present study was aimed to evaluate the root canal morphology of mandibular premolars using clearing and cone beam computed tomography (CBCT) techniques. Materials and Methods: A total of 182 mandibular first and second premolars were evaluated in vitro using 100 μm CBCT cross sections. The root canal morphology of the teeth was determined based on Vertucci classification in relation to the prevalence of C-shaped canals, lateral canals, and furcation location...
September 2017: Dental Research Journal
Bhagyashree Thakur, Ajinkya M Pawar, Anda Kfir, Prasanna Neelakantan
INTRODUCTION: To assess the amount of debris extruded apically during instrumentation of distal canals of extracted primary molars by three instrument systems [ProTaper Universal (PTU), ProTaper NEXT (PTN), and self-adjusting file (SAF)] compared with conventional stainless steel hand K-files (HF, control). MATERIALS AND METHODS: Primary mandibular molars (n = 120) with a single distal canal were selected and randomly divided into four groups (n = 30) for root canal instrumentation using group I, HF (to size 0...
November 1, 2017: Journal of Contemporary Dental Practice
Nélio Bairros Dornelles, Fabrício Mezzomo Collares, Bruna Genari, Gabriela de Souza Balbinot, Susana Maria Werner Samuel, Rodrigo Alex Arthur, Fernanda Visioli, Silvia Stanisçuaski Guterres, Vicente Castelo Branco Leitune
AIM: To develop an endodontic sealer with amoxicillin-loaded microsphere and to evaluate its properties. METHODS: Experimental sealer was obtained by mixing 70wt% UDMA, 15wt% GDMA and 15wt% BISEMA. In addition, CQ, DHEPT and PB were incorporated at 1 mol% and 0.01wt% BHT and 10wt% YbF3. Microspheres were produced by drying in spray dryer. Two experimental groups (10 and 15wt% of microspheres) and one control group (without microspheres) were formulated. The sealers were evaluated for the degree of conversion (n=3), degradation in solvent (n=3), drug release profile (n=3), antimicrobial activity (n=3), flow (n=3), film thickness (n=3) and cytotoxicity (n=3)...
October 26, 2017: Journal of Dentistry
G Bryce, N MacBeth, K Gulabivala, Y-L Ng
AIM: To evaluate the efficacy of sonic irrigation (EndoActivator(®) ) using various polymer tips and power-settings in a stained collagen ex-vivo model. METHODOLOGY: Fifty human, straight single-rooted extracted teeth were prepared to size 40,.08 taper. The roots were split longitudinally; stained collagen applied to the canal surfaces, photographed and re-assembled. The canals were subjected to syringe without supplementary (Group 1, n = 10), or with supplementary sonic (groups 2-5, n = 10) irrigation...
November 6, 2017: International Endodontic Journal
Prasanna Neelakantan, Priyanka Sriraman, James L Gutmann
The aim of this study was to use cone beam computed tomography (CBCT) to evaluate the removal of calcium hydroxide (Ca[OH]2) from root canals after using different irrigation and activation protocols. Root canals (n = 128) were filled with Ca(OH)2 and scanned using CBCT. The Ca(OH)2 was removed after 1 week using 1 of 12 groups (G1-G12) according to the final irrigating solution: G1, 6% sodium hypochlorite (NaOCl) + 18% etidronic acid (EA) with no activation; G2, NaOCL + EA + passive ultrasonic irrigation (PUI); G3, NaOCl + EA + Finishing File (FF); G4, NaOCl + EA + NaviTip FX irrigation needle (NTFX); G5, 3% NaOCl + 17% ethylenediaminetetraacetic acid (EDTA) with no activation; G6, NaOCl + EDTA + PUI; G7, NaOCl + EDTA + FF; G8, NaOCl + EDTA + NTFX; G9, 3% NaOCl with no activation; G10, NaOCl + PUI; G11, NaOCl + FF; G12, NaOCL + NTFX...
November 2017: General Dentistry
Rayana Longo Bighetti Trevisan, Renata Siqueira Scatolin, Larissa Moreira Spinola de Castro Raucci, Walter Raucci Neto, Izabel Cristina Froner
The aim of this study was to evaluate the effect of 24% ethylenediaminetetraacetic acid (EDTA) gel and 2% chlorhexidine gel (CHX) in dentin permeability and smear layer removal from root canals instrumented with NiTi rotary system using histochemical staining and scanning electron microscopy (SEM) analysis. Overall, 43 premolars were classified into two experimental groups, EDTA (n = 20) and CHX (n = 20), and a negative control (NC) (n = 3). All specimens were instrumented and the irrigant solutions were used after each file change...
October 30, 2017: Microscopy Research and Technique
Luise Jungnickel, Casper Kruse, Michael Vaeth, Lise-Lotte Kirkevang
OBJECTIVE: To evaluate factors associated with treatment quality of ex vivo root canal treatments performed by undergraduate dental students using different endodontic treatment systems. MATERIAL AND METHODS: Four students performed root canal treatment on 80 extracted human teeth using four endodontic treatment systems in designated treatment order following a Latin square design. Lateral seal and length of root canal fillings was radiographically assessed; for lateral seal, a graded visual scale was used...
October 29, 2017: Acta Odontologica Scandinavica
Yu-Chiao Wu, Wan-Chien Cheng, Ming-Pang Chung, Chi-Chun Su, Pei-Wei Weng, Yi-Wen Cathy Tsai, Ho-Sheng Chiang, Hsiao-Wen Yeh, Chi-Hsiang Chung, Yi-Shing Shieh, Ren-Yeong Huang
INTRODUCTION: The aim of this study was to assess the root canal configurations in permanent mandibular lateral incisors (PMLIs) and the correlation between the root canal configurations of PMLIs with the appearance of a distolingual root (DLR) in permanent mandibular first molars (PMFMs) using cone-beam computed tomographic (CBCT) imaging. METHODS: A total of 1200 CBCT images (300 patients) of PMFMs and PMLIs were investigated. The frequency and distribution of DLRs in PMFMs along with root canal configurations of PMLIs were assessed ipsilaterally and contralaterally...
October 24, 2017: Journal of Endodontics
Carlos-Vieira Andrade-Junior, Nilton-Dessaune Neto, Renata-Costa-Val Rodrigues, Henrique-Dos Santos Antunes, Mariana-Teixeira-Maneschy Porpino, Júlio-Cesar A Carvalhal, Luciana Armada
BACKGROUND: This study compared the incidence of deviation along curved canals after preparation with two nickel-titanium (NiTi) rotary systems, Twisted File Adaptive and BT-RaCe. MATERIAL AND METHODS: Forty resin training blocks with curved canals were filled with ink and divided into two groups according to the instrumentation technique. Preinstrumentation images were acquired by using a stereomicroscope. The canals were up to an instrument #35/0.04. Postinstrumentation images were captured using the same conditions, and the images were superimposed...
September 2017: Journal of Clinical and Experimental Dentistry
Hamidreza Yavari, Negin Ghasemi, Baharak Divband, Yashar Rezaei, Golchin Jabbari, Salar Payahoo
BACKGROUND: The aim of this in vitrostudy was to examine and compare the effect of photodynamic therapy and solution containing nano particles Ag/ZnO on adhesion of endodontic sealers to dentinal walls of human root canal. MATERIAL AND METHODS: Ninty single-rooted human teeth were selected and their clinical crown was cut from the cemento-enamel junction zone. Canals were prepared by RaCe rotary system and the smear layer was removed using 17% EDTA and 5.25% NaOCl...
September 2017: Journal of Clinical and Experimental Dentistry
Natasha Jaiswal, Dakshita-Joy Sinha, Udai-Pratap Singh, Kanwardeep Singh, Urja-Ahuja Jandial, Shivika Goel
BACKGROUND: Long term successful root canal treatment requires effective debridement and disinfection of root canal system. Persistent periradicular lesions are usually associated with Enterococccus faecalis. Prompt research for natural alternatives for irrigation is mainly due to the constant increase in antibiotic resistant strains and side effects caused by synthetic drugs. Sodium hypochlorite; the gold standard for irrigation has many disadvantages. Therefore, the present study was aimed to explore newer irrigants probably be as more effective and at the same time would be less irritating to the tissues than NaOCl...
September 2017: Journal of Clinical and Experimental Dentistry
B Buldur, A Kapdan
OBJECTIVE: This study aimed to compare the EndoVac system and conventional needle irrigation in removing smear layer (SR) from primary molar root canals. MATERIALS AND METHODS: Fifty extracted human primary second molar roots were instrumented up to an apical size of 0.04/35 and randomly divided into two main groups; Group 1: EndoVac system (n = 25) and Group 2: Conventional needle irrigation (n = 25) and three subgroups (a) NaOCl + ethylenediaminetetraacetic acid (EDTA) (n = 20) (b) ozonated water (OW) + EDTA (n = 20) and (c) saline (control, n = 10)...
September 2017: Nigerian Journal of Clinical Practice
Layla Reginna Silva Munhoz de Vasconcelos, Raquel Zanin Midena, Paloma Gagliardi Minotti, Thais Cristina Pereira, Marco Antonio Hungaro Duarte, Flaviana Bombarda de Andrade
New technical and scientific developments have been advocated to promote the success of the endodontic treatment. In addition to rotary and reciprocating systems, irrigating solution agitation has been suggested and passive ultrasonic irrigation (PUI) is the most used. OBJECTIVE: To evaluate, in vitro, the effect of ultrasound streaming (US) in the disinfection of flattened root canal systems prepared by the ProTaper, BioRaCe and Reciproc systems, utilizing the microbiological culture...
September 2017: Journal of Applied Oral Science: Revista FOB
Roberto Holland, João Eduardo Gomes, Luciano Tavares Angelo Cintra, Índia Olinta de Azevedo Queiroz, Carlos Estrela
Tissue repair is an essential process that reestablishes tissue integrity and regular function. Nevertheless, different therapeutic factors and clinical conditions may interfere in this process of periapical healing. This review aims to discuss the important therapeutic factors associated with the clinical protocol used during root canal treatment and to highlight the systemic conditions associated with the periapical healing process of endodontically treated teeth. The antibacterial strategies indicated in the conventional treatment of an inflamed and infected pulp and the modulation of the host's immune response may assist in tissue repair, if wound healing has been hindered by infection...
September 2017: Journal of Applied Oral Science: Revista FOB
Basil Athanassiadis, Laurence J Walsh
Calcium hydroxide pastes have been used in endodontics since 1947. Most current calcium hydroxide endodontic pastes use water as the vehicle, which limits the dissolution of calcium hydroxide that can be achieved and, thereby, the maximum pH that can be achieved within the root canal system. Using polyethylene glycol as a solvent, rather than water, can achieve an increase in hydroxyl ions release compared to water or saline. By adopting non-aqueous solvents such as the polyethylene glycols (PEG), greater dissolution and faster hydroxyl ion release can be achieved, leading to enhanced antimicrobial actions, and other improvements in performance and biocompatibility...
October 23, 2017: Materials
Laurence J Walsh, Roy George
In conventional endodontic treatment, alkaline solutions of sodium hypochlorite (NaOCl) and ethylenediaminetetraacetic acid (EDTA) are used in combination to disinfect the root canal system and to eliminate debris and smear layers. An important concept that has emerged over recent years is the use of active physical methods for agitating these fluids to improve their penetration within areas that are not reached by endodontic instruments and to accelerate the chemical actions of these alkaline fluids against planktonic microorganisms, biofilms, soft tissue remnants and smear layers...
October 23, 2017: Materials
Ashley Karczewski, Sabrina A Feitosa, Ethan I Hamer, Divya Pankajakshan, Richard L Gregory, Kenneth J Spolnik, Marco C Bottino
INTRODUCTION: A biocompatible strategy to promote bacterial eradication within the root canal system after pulpal necrosis of immature permanent teeth is critical to the success of regenerative endodontic procedures. This study sought to synthesize clindamycin-modified triple antibiotic (metronidazole, ciprofloxacin, and clindamycin [CLIN]) polymer (polydioxanone [PDS]) nanofibers and determine in vitro their antimicrobial properties, cell compatibility, and dentin discoloration. METHODS: CLIN-only and triple antibiotic CLIN-modified (CLIN-m, minocycline-free) nanofibers were processed via electrospinning...
October 20, 2017: Journal of Endodontics
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