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Apical debris

Alberto Dagna, Giulia Gastaldo, Riccardo Beltrami, Claudio Poggio
This study evaluated the root canal dentine surface by scanning electron microscope (SEM) after shaping with two reciprocating single-file NiTi systems and two rotating single-file NiTi systems, in order to verify the presence/absence of the smear layer and the presence/absence of open tubules along the walls of each sample; Forty-eight single-rooted teeth were divided into four groups and shaped with OneShape (OS), F6 SkyTaper (F6), WaveOne (WO) and Reciproc and irrigated using 5.25% NaOCl and 17% EDTA. Root canal walls were analyzed by SEM at a standard magnification of 2500×...
October 17, 2016: Journal of Functional Biomaterials
I Kaşikçi Bilgi, I Köseler, P Güneri, M Hülsmann, M K Çalişkan
AIM: To compare the amount of apically extruded debris and of remaining filling material during the removal of root canal filling material using three rotary NiTi retreatment instruments or Hedström files. METHODOLOGY: Ninety-six severely curved human molars of both jaws were selected. The root canals were prepared to size X2 (tip size 25, .06 taper) using the ProTaper Next system (Dentsply Sirona, Ballaigues, Switzerland), filled with gutta-percha and AH Plus sealer (Dentsply De Trey, Konstanz, Germany) and were randomly divided into 4 experimental groups (n= 24 each) with two subgroups of maxillary and mandibular teeth each...
October 5, 2016: International Endodontic Journal
Ali Keleş, Hatice Alçin, Manoel D Sousa-Neto, Marco A Versiani
INTRODUCTION: The purpose of this ex vivo study was to evaluate the percentage reduction of accumulated hard tissue debris (AHTD) in the mesial root canal system of mandibular molars under different final irrigation regimens by means of micro-computed tomographic imaging. METHODS: Sixty curved mesial roots of mandibular molars with 2 independent canals joint apically by an isthmus (Vertucci type II) were selected. Specimens were scanned at a resolution of 12.5 μm, anatomically matched, and distributed into 3 groups (n = 20) according to the preparation protocol: Self-Adjusting File (SAF; ReDent Nova, Ra'anana, Israel), Reciproc (VDW GmbH, Munich, Germany), and Revo-S (Micro-Mega, Besançon, France) systems...
September 9, 2016: Journal of Endodontics
S Kiran, Sandeep Prakash, Pujari R Siddharth, Supradip Saha, Naiza E Geojan, Mookambika Ramachandran
INTRODUCTION: The effect of smear layer and debris on the success rate of endodontic treatment has not yet been definitely determined. So the present study was aimed to evaluate the amount of smear layer and debris on the canal walls prepared with a combination of hand and rotary ProTaper technique using NaOCl and ethylenediaminetetraacetic acid (EDTA) alternately as root canal irrigants using scanning electron microscope (SEM). MATERIALS AND METHODS: Eighty intact freshly extracted human permanent mandibular premolar teeth were collected and randomly divided equally into four groups...
2016: Journal of Contemporary Dental Practice
Sérgio Luiz Pinheiro, Giuliana Rodrigues Azenha, Yasmin Marialva Democh, Daniela Camila Nunes, Silvia Provasi, Giovana Masiero Fontanetti, Danilo Antônio Duarte, Carlos Eduardo Fontana, Carlos Eduardo da Silveira Bueno
OBJECTIVE: The present study sought to evaluate the antimicrobial activity against Enterococcus faecalis of photodynamic therapy applied before and after reciprocating instrumentation of permanent molars. BACKGROUND: Apical extrusion of debris can cause flare-ups due to introduction of bacteria into the periapical tissues. METHODS: Eighteen mesial roots from permanent mandibular molars were selected. The crowns were removed to obtain a standard root length of 15 mm...
August 25, 2016: Photomedicine and Laser Surgery
Ersan Çiçek, Mustafa Murat Koçak, Sibel Koçak, Baran Can Sağlam
BACKGROUND: The type of instrument affects the amount of debris extruded. The aim of this study was to compare the effect of retreatment systems and supplementary file application on the amount of apical debris extrusion. MATERIALS AND METHODS: Forty-eight extracted mandibular premolars with a single canal and similar length were selected. The root canals were prepared with the ProTaper Universal system with a torque-controlled engine. The root canals were dried and were obturated using Gutta-percha and sealer...
July 2016: Journal of Conservative Dentistry: JCD
Swetha Kasam, Annapoorna Ballagere Mariswamy
INTRODUCTION: Although success of endodontic therapy has significantly improved in the last few decades due to the introduction of novel materials and techniques, failures of endodontic therapy requiring re-treatment still comprise a significant percentage of patients requiring root canal treatment. AIM: To evaluate and compare the effective removal of gutta percha and sealer, amount of apical debris extrusion and time required for gutta percha removal using various endodontic files...
June 2016: Journal of Clinical and Diagnostic Research: JCDR
Leon Mendel McClusky, James Sulikowski
This comparative study of the radial testes of sexually mature thresher sharks (Alopias vulpinus) and shortfin mako sharks (Isurus oxyrinchus) describes the histology of the three-tiered network of sperm-carrying ductules in the testis and the lymphomyeloid tissue associated with it, namely the epigonal organ. In both species, a testis → epigonal gradient was evident regarding the thickness of the ductule epithelial lining and subepithelial investment of connective tissue. Ductules straddling the testis-epigonal border often displayed luminal leukocytes and various signs of regression, including the progressive thickening of the ductule epithelial lining, dissolution of the cytoplasm, and loss of normal histoarchitecture...
October 2016: Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
Aruna Kanaparthy, Rosaiah Kanaparthy
INTRODUCTION: Root canal treatment enjoys a high success rate all over the world and has saved billions of teeth from extraction. However, there are instances of failure, the main causes being insufficient cleaning and inadequate obturation. In such cases the most conservative treatment option would be non-surgical retreatment. It requires regaining access to the entire root canal system through removal of the original root canal filling thus permitting further cleaning and re- obturation...
May 2016: Journal of Clinical and Diagnostic Research: JCDR
Emmanuel J N L Silva, Mônica E Brito, Vivian D Ferreira, Felipe G Belladonna, Aline A Neves, Plinio M Senna, Gustavo De-Deus
We evaluated the cytotoxic effects of the debris apically extruded during root canal retreatment on primary human osteoblast (HOb) cells in vitro. TNF-α and IL-1β levels were also measured. We examined three different techniques: conventional hand-files, and Mtwo and Reciproc retreatments. Filled mandibular incisors were prepared for a cytotoxicity assay in an experimental root model. The material was divided into three groups according to the technique used. Ten teeth were used as control. HOb cells were exposed to the extruded content and cytotoxicity was evaluated using the MTT test (assessing cell metabolic activity)...
2016: Journal of Oral Science
Paramasivam Vivekanandhan, Arunajatesan Subbiya, Suresh Mitthra, Arumugam Karthick
BACKGROUND: Postoperative inflammation and endodontic failure occur due to apical extrusion of debris. AIM: To evaluate the amount of apically extruded debris after preparation of straight root canals in extracted human teeth using three rotary systems. MATERIALS AND METHODS: Sixty single-rooted human teeth with single root canal and apical foramen were selected and randomly divided into three experimental groups (n = 20) according to the rotary system used: Group 1 - ProTaper, Group 2 - Revo-S, Group 3 - WaveOne...
May 2016: Journal of Conservative Dentistry: JCD
Nishant K Vyavahare, Srinidhi Surya Raghavendra, Niranjan N Desai
BACKGROUND: Complete cleaning of the root canal is the goal for ensuring success in endodontics. Removal of debris plays an important role in achieving this goal. In spite of advancements in instrument design, apical extrusion of debris remains a source of inflammation in the periradicular region. AIM: To comparatively evaluate the amount of apically extruded debris with V-Taper, ProTaper Next, and the self-adjusting File (SAF) system. MATERIALS AND METHODS: Sixty-four extracted human mandibular teeth with straight root canals were taken...
May 2016: Journal of Conservative Dentistry: JCD
Amr M Elnaghy, Ayman Mandorah, Shaymaa E Elsaka
The purpose of this study was to assess the efficacy of the XP-endo Finisher (FKG Dentaire SA, La Chaux-de-Fonds, Switzerland) file on debris and smear layer removal in curved root canals in comparison to different irrigation regimens. Seventy-five freshly extracted human mandibular molar teeth with mesial root curved more than 20° were used in this study. The mesial root canals were mechanically prepared using the BT-Race rotary system (FKG Dentaire) and divided into five groups (n = 15) according to the following irrigation techniques: positive control, non-agitated, File agitation, XP-endo Finisher, and EndoActivator (Dentsply Tulsa Dental Specialities, Tulsa, OK, USA)...
May 20, 2016: Odontology
So-Yeon Ahn, Hyeon-Cheol Kim, Euiseong Kim
INTRODUCTION: This review aimed to compare the kinematic effect of nickel-titanium instruments with reciprocating and continuous rotation motion for cyclic fatigue resistance, shaping ability, apical debris extrusion, and dentinal defects or cracks. METHOD: Articles were selected for inclusion in this review if they fulfilled all of the following criteria: described in vitro studies performed on either extracted human teeth or an artificial canal model, assessed both reciprocating and rotary instruments, compared reciprocating files and rotary files for the kinematics of files, and evaluated reciprocating and rotary files regarding the aim of this study...
July 2016: Journal of Endodontics
Burhan Can Çanakçi, Yakup Ustun, Ozgur Er, Ozgur Genc Sen
INTRODUCTION: This study evaluated the amount of apically extruded debris in the retreatment of curved root canals using different nickel-titanium (NiTi) systems: the ProTaper Universal Retreatment (Dentsply Maillefer, Ballaigues, Switzerland), Mtwo Retreatment (VDW, Munich, Germany), D-Race Retreatment (FKG Dentaire, La Chaux-de-Fonds, Switzerland), R-Endo Retreatment (Micro-Mega, Besançon, France), and Reciproc (VDW) systems. METHODS: One hundred human mandibular premolars with curved root canals were prepared with the Reciproc #25 ...
July 2016: Journal of Endodontics
Paul L A Gabbott
Layer 1 of the cortex contains populations of neurochemically distinct neurons and afferent fibers which markedly affect neural activity in the apical dendritic tufts of pyramidal cells. Understanding the causal mechanisms requires knowledge of the cellular architecture and synaptic organization of layer 1. This study has identified eight morphological classes of calretinin immunopositive (CRet+) neurons (including Cajal-Retzius cells) in layer 1 of the prefrontal cortex (PFC) in adult monkey (Macaca fasicularis), with a distinct class - termed "subpial fan (SPF) cell" - described in detail...
2016: Frontiers in Neuroanatomy
Martijn Wessels, Edsko E G Hekman, Moyo C Kruyt, René M Castelein, Jasper J Homminga, Gijsbertus J Verkerke
PURPOSE: In vivo evaluation of scoliosis treatment using a novel approach in which two posterior implants are implanted: XSLAT (eXtendable implant correcting Scoliosis in LAT bending) and XSTOR (eXtendable implant correcting Scoliosis in TORsion). The highly flexible and extendable implants use only small, but continuous lateral forces (XSLAT) and torques (XSTOR), thereby allowing growth and preventing fusion. METHODS: Since (idiopathic) scoliosis does not occur spontaneously in animals, the device was used to induce a spinal deformity rather than correct it...
September 2016: European Spine Journal
Ajinkya M Pawar, Mansing Pawar, Zvi Metzger, Bhagyashree Thakur
AIM: This study evaluated whether using supplementary files for removing root canal filling residues after ProTaper Universal Retreatment files (RFs) increased the debris extrusion apically. MATERIALS AND METHODS: Eighty mandibular premolars with single root and canal were instrumented with ProTaper Universal rotary system (SX-F3) and obturated. The samples were divided randomly into four groups (n = 20). Group 1 served as a control; only ProTaper Universal RFs D1-D3 were used, and the extruded debris was weighed...
March 2016: Journal of Conservative Dentistry: JCD
Emel Uzunoglu, Sevinc Aktemur Turker
OBJECTIVE: The goal of present study was to determine the effect of different nickel-titanium file systems on the amount of apically extruded debris during endodontic retreatment: D-RaCe retreatment systems, EdgeFile XR retreatment rotary files, and Reciproc R40. MATERIALS AND METHODS: Thirty-six single-rooted prepared mandibular premolar teeth were filled with Gutta-percha and AH Plus sealer. The teeth were then randomly assigned into three groups (n = 12) for retreatment...
April 2016: European Journal of Dentistry
Paula Barcellos Silva, Angélica Mohnsam Krolow, Katerine Jahnecke Pilownic, Renata Picanço Casarin, Regina Karla Pontes Lima, Renato de Toledo Leonardo, Fernanda Geraldo Pappen
This study evaluated the influence of irrigation tip, root canal curvature and final apical diameter on periapical debris and irrigant extrusion during root canal instrumentation. After being classified as mildly or moderately curved, the mesiobuccal root canals of 90 human molars were instrumented. The teeth were allocated into three groups according to the used needle type: a flat open-end needle (Group 1), a side-vented needle (Group 2) or a double side-vented needle (Group 3). The amount of extruded material after instrumentation was calculated for each group...
March 2016: Brazilian Dental Journal
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