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Root canal system

Caner Öztürk, Serdar Polat, Makbule Tunçdemir, Fehmi Gönüldaş, Emre Şeker
BACKGROUND: Restoration of the teeth with extensive root canals with different post systems is a challenge for clinicians. Evaluation of these systems is important for clinical success. The aim of this study was to compare the fracture resistance and fracture mode of endodontically treated thin-walled teeth which restored with different post systems. METHODS: Eighty extracted and endodontically treated maxillary canines were divided into 4 groups (n = 20) and the thickness of the radicular dentin walls was reduced by using diamond burs...
February 2019: Biomedical Journal
Isbelia Gazzaneo, Gaya C S Vieira, Alejandro R Pérez, Flávio R F Alves, Lucio S Gonçalves, Ibrahimu Mdala, José F Siqueira, Isabela N Rôças
INTRODUCTION: This ex vivo study evaluated the intracanal bacterial reduction promoted by chemomechanical preparation using a single-file technique varying the volume, concentration, and retention time of sodium hypochlorite (NaOCl) irrigation in comparison with a multifile system. METHODS: Palatal roots from extracted maxillary first molars were selected and anatomically matched based on microcomputed tomographic analysis for group distribution. The canals were contaminated with a fresh mixed bacterial culture grown in anaerobiosis and recently obtained from a tooth with apical periodontitis...
April 10, 2019: Journal of Endodontics
David Wayne Ronald Chubb
The aim of this review is to discuss the requirements for effective irrigation of the root canal system and its role in treatment outcome. A review of the literature regarding irrigants, methods of irrigation and regimens was undertaken. It indicates that irrigation is comprised of a multitude of factors, and that effective irrigant delivery and agitation achieves mechanical, chemical and microbiological functions, which are prerequisites for obtaining a clean canal system. However, most studies are ex vivo and assess intermediate outcome values rather than treatment success...
April 2019: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
Sidinéia Feitoza de Jesus, Nestor Cohenca, Priscilla Coutinho Romualdo, Paulo Nelson-Filho, Alexandra Mussolino de Queiroz, Manoel Damião Sousa-Neto, Francisco Wanderley Garcia Paula-Silva, Léa Assed Bezerra da Silva
The aim of this study was to evaluate the radiographic periapical repair and the synthesis of inflammatory mediators after endodontic treatment in a single session, using different irrigation protocols, in teeth with apical periodontitis. Experimental apical periodontitis were induced in dog's teeth randomly assigned into 4 groups: G1 - Irrigation by Negative Apical Pressure (n= 20); G2 - Passive Ultrasonic Irrigation (n= 20), G3 - Positive Pressure Irrigation (n= 20); G4 - apical periodontitis without treatment (n= 20)...
March 2019: Brazilian Dental Journal
Wenhao Qian, Ting Ma, Mao Ye, Zhiyao Li, Yuanhua Liu, Pei Hao
BACKGROUND: Apical periodontitis (AP) is essentially an inflammatory disease of microbial etiology primarily caused by infection of the pulp and root canal system. Variation of the bacterial communities caused by AP, as well as their changes responding to dental therapy, are of utmost importance to understand the pathogensis of the apical periodontitis and establishing effective antimicrobial therapeutic strategies. This study aims to uncover the composition and diversity of microbiota associated to the root apex to identify the relevant bacteria highly involved in AP, with the consideration of root apex samples from the infected teeth (with/without root canal treatment), healthy teeth as well as the healthy oral...
April 4, 2019: BMC Genomics
Steffi Baxter, Friederike Beck, Michael Hülsmann
OBJECTIVES: To examine various parameters of root canal preparation using three rotary nickel-titanium systems (S5, Mtwo, and ProTaper Universal [PTU]). METHOD AND MATERIALS: One hundred and twenty curved root canals were prepared to size 30. The following parameters were evaluated: straightening, changes of root canal cross-section, safety issues, cleanliness of canal walls, and working time. Statistical analysis was performed with the Kruskal-Wallis test, Wilcoxon-Mann-Whitney test, and analysis of variance (P < ...
2019: Quintessence International
Daniel José Filizola de Oliveira, Graziela Bianchi Leoni, Rafael da Silva Goulart, Manoel Damião de Sousa-Neto, Yara Teresinha Correa Silva Sousa, Ricardo Gariba Silva
INTRODUCTION: The aim of this study was to compare the shaping ability of 4 different nickel-titanium systems, considering their variation in alloy treatment, kinematics, and design, used to prepare canals with severe curvature using micro-computed tomographic analysis. METHODS: Thirty-two mesial roots of mandibular molars with severe curvature were matched based on similar morphologic dimensions and assigned to 4 experimental groups (n = 8) according to the canal preparation: ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland), Reciproc (RC; VDW GmbH, Munich, Germany), Reciproc Blue (RCB, VDW GmbH), and TRUShape (TRU; Dentsply Tulsa Dental Specialties, Tulsa, OK) systems...
April 3, 2019: Journal of Endodontics
Eduarda Helena Leandro Nascimento, Marcela Ramos Abrahão Elias, Victor Hugo Fernandes Vasconcelos, Francisco Haiter-Neto, Elismauro Francisco Mendonça, Thiago Oliveira Sousa
INTRODUCTION: Imaging methods are essential for the correct identification of root canal anatomy, which is a key factor for successful endodontic therapy. This study aimed to evaluate the performance of periapical radiography (PR) and cone-beam computed tomographic (CBCT) imaging in identifying the apical delta (AD) using micro-computed tomographic imaging as the gold standard. METHODS: PR and CBCT images of 110 human premolars (120 root canals) were obtained using the VistaScan digital intraoral system (Durr Dental, Beitigheim-Bissinger, Germany) and the 3D Accuitomo CBCT unit (J Morita, Kyoto, Japan), respectively...
April 3, 2019: Journal of Endodontics
Sascha Rudolf Herbst, Joachim Krois, Falk Schwendicke
AIMS: Endodontic instruments are frequently compared against each other for their cyclic fatigue resistance (CFR). It is unclear what drives the comparator choice in CFR studies, and how comparators and comparisons have evolved over time. We aimed at evaluating CFR study networks, hypothesizing that indications and instrument properties (alloy, manufacturer) drive comparisons. METHODS: A systematic review was performed via Medline and Embase (1986-2017). In vitro studies analyzing the CFR of ≥2 engine-driven instruments in an artificial curved root canal system were included...
April 2, 2019: Journal of Endodontics
Ibrahim Alnassar, Ahmad Saleem Alsafadi, Chaza Kouchaji
BACKGROUND: One of the factors that most negatively affect the endodontic instrumentation process in primary teeth is the presence of extruded debris in the periapical region. Therefore, different techniques have been evaluated to reach an answer to the question regarding which root canal preparation method produces the least amount of debris extrusion. OBJECTIVES: The main objective of this study was to assess the amount of debris extrusion as well as irrigation associated with 3 different instrumentation techniques: a rotary system (PROTAPER NEXT® - PTN), a reciprocating system (WaveOne® - WO) and hand K-files...
January 2019: Dental and Medical Problems
Zakiyeh Donyavi, Abbas Shokri, Elham Khoshbin, Maryam Khalili, Javad Faradmal
BACKGROUND: Inability to efficiently clean all root canals due to the complex anatomy of the root canal system is a common cause of endodontic treatment failure. OBJECTIVES: This study aimed to assess the root canal morphology of the maxillary and mandibular second molars using cone-beam computed tomography (CBCT). MATERIAL AND METHODS: This descriptive study evaluated 502 CBCT scans taken in the years 2014-2017. The number of roots and canals, type of canals according to the Vertucci classification, presence of maxillary second molars with 2 palatal roots, and C‑shaped canals in the maxillary and mandibular second molars were evaluated on CBCT scans separately by a radiologist and 2 endodontists...
January 2019: Dental and Medical Problems
Xiaoli Hu, Zijing Huang, Zhuwei Huang, Lizhen Lei, Minyi Cui, Xiaolei Zhang
PURPOSE: To investigate the prevalence of isthmi and middle mesial (MM) canals in the mesial roots of mandibular first molars (MFM) in a Mongoloid subpopulation and to evaluate their association with demographic and anatomic characteristics. METHODS: Cone-beam computed tomography (CBCT) images of 496 patients with 823 MFMs were selected and analyzed. The following data were collected: patient age and gender, side, presence and distribution of MM canal and isthmus, distance between mesiobuccal (MB) and mesiolingual (ML) orifices, and MB-ML root canal system (RCS) morphology...
April 1, 2019: Surgical and Radiologic Anatomy: SRA
Zeliha Uğur Aydın, Neslihan Büşra Keskin, Taha Özyürek, Ferhat Geneci, Mert Ocak, Hakan Hamdi Çelik
INTRODUCTION: The aim of this study was to compare the transportation and centering abilities of the ProGlider (PG; Dentsply-Sirona, Ballaigues, Switzerland), WaveOne Gold Glider (WOGG; Dentsply-Sirona), and R-Pilot (RP; VDW, Munich, Germany) file systems and the changes in the structure model index (SMI), surface area, and root canal volume (after creating the glide path in the mandibular first molar teeth's mesial canals with moderate curvature) using the micro-computed tomographic (micro-CT) method...
March 29, 2019: Journal of Endodontics
Ayca Tuba Ulusoy, Irem Turedi, Muge Cimen, Zafer C Cehreli
INTRODUCTION: Regenerative endodontic procedures (REPs) using autologous platelet concentrates as scaffolds can improve the biologic outcome of treatment. This prospective, randomized trial compared the clinical and radiographic performance of REPs using platelet-rich plasma (PRP), platelet-rich fibrin (PRF), a platelet pellet (PP), and an induced blot clot (BC). METHODS: Sixty-seven healthy children (aged 8-11 years) with 88 immature necrotic incisors were included...
March 29, 2019: Journal of Endodontics
Sang Won Kwak, Jung-Hong Ha, Gary Shun-Pan Cheung, Sung Kyo Kim, Hyeon-Cheol Kim
INTRODUCTION: The purpose of this in vitro study was to compare the torque generated by continuous and adaptive movements of 2 nickel-titanium rotary file systems. METHODS: Forty-five simulated resin blocks with an S-shaped canal were randomly divided into 3 groups (n = 15) according to the file system and kinematics: the K3XF rotary system (Kerr Endodontics, Orange, CA) with continuous rotary movement, the K3XF with adaptive movement, and the Twisted File (Kerr Endodontics) adaptive file with adaptive movement...
March 29, 2019: Journal of Endodontics
Shikha Singh, Monika Singh, Abdul R Salgar, Namratha Chandrahari, Nandagiri Prathibha, Pradeep Koppolu
Background: Existence of smear layer in root canals caused by instrumentation is believed to prevent penetration of irrigating agents, thereby resulting in endodontic treatment. Aims and Objectives: To compare and evaluate the effectiveness of two irrigants: 17% ethylenediaminetetraacetic acid (EDTA) and mixture of tetracycline isomer, an acid, and a detergent (MTAD) as final agents for eliminating the smear layer. Materials and Methods: We included 50 human lower premolar teeth whose crowns were sectioned at cementoenamel junction...
February 2019: Journal of Pharmacy & Bioallied Sciences
Camila C Lorenzetti, Janaina F Bortolatto, Anna T P R Ramos, André L Shinohara, Jose R C Saad, Milton C Kuga
This study compared the performance of a glass ionomer (GC Gold Label 1, GIC) as a fiber post cementation system for glass fiber posts with a self-adhesive resin cement (Relyx U200, RUC) and a conventional resin cement system (Scotchbond Muli-Purpose and Relyx ARC, RAC). Thirty endodontically treated canines were randomly divided in three groups (n = 10), according to the fiber post cementation system: (RAC)-Scotchbond Multi-Purpose and Relyx X ARC; (RUC)-Relyx U200 and (GIC)-GC Gold Label 1 Luting & Lining...
March 28, 2019: Microscopy Research and Technique
Hrudi Sundar Sahoo, R Kurinji Amalavathy, D Pavani
Success in root canal treatment demands a thorough knowledge of usual root canal anatomy and its variations pertaining to every tooth. Variations in root canal anatomy are often accompanied by complex orientation of pulp tissues making a thorough mechanical and chemical debridement a challenge. Inability to treat such complexities often leads to endodontic failure. Upon a quick review of the literature, it has been noted that very few root canal complexities in maxillary canines have been reported. To be a successful clinician, one must be aware of such rare anatomical instances in maxillary canines...
2019: Case Reports in Dentistry
Bulem Üreyen Kaya, Cevat Emre Erik, Gülsen Kiraz
The aim was to examine the effect of retreatment process on the surface roughness and nickel titanium (NiTi) composition of ProTaper Universal Retreatment (PTUR; consists of 3 files; D1, D2, D3) and WaveOne Gold (WOG) (primary) instruments. Twenty extracted mandibular molar teeth with severe curved (30-40°) mesial roots were selected and divided into two groups (n = 10) based on the instrument used for the removal of the root canal filling. Before and after using the instruments in two canals, they were subjected to atomic force microscopy (AFM) and energy dispersive X-ray spectrophotometry (EDX) analysis...
March 27, 2019: Microscopy Research and Technique
Tina Rödig, Juliane Krämer, Christine Müller, Annette Wiegand, Franziska Haupt, Marta Rizk
This study evaluated the effect of three different NiTi instrumentation techniques on the incidence of microcracks after the preparation of straight and curved root canals using micro-CT. Roots from mandibular premolars and maxillary molars (n = 66) with the same mean canal curvatures were assigned to three groups of straight and three groups of curved roots (n = 11). After preoperative micro-CT scans, root canals were prepared with Reciproc, OneShape and ProTaper Next to size 25. Specimens were scanned again, and pre- and post-operative cross-sectional images (n = 75 263) were screened to identify the presence of dentinal microcracks...
March 25, 2019: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
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