Abstract:
:The objective of this study was to assess and compare canal blockages and apical extrusion of dentin debris during canal shaping with eight preparation techniques. A total of 208 canals in extracted human teeth were prepared by one operator using one type of file. The techniques included were standardized, stepback with reaming, stepback with circumferential filing, stepback with anticurvature filing, double-flare, stepdown, crown-down pressureless, and balanced force. Records were kept of the number of canals that became permanently blocked with debris at some stage during preparation. Dentin debris extruded apically was collected in preweighed containers and the dry weight of debris determined to 10(-5) g precision. Blockages varied significantly among techniques (p < 0.001) and occurred most frequently in canals prepared with the stepback techniques with anticurvature (n = 19) and circumferential filing (n = 16) and least in the balanced force technique (n = 0). Apical extrusion occurred in 169 of the 208 roots, but there were no significant differences in the incidence of extrusion among techniques. The weight of extruded dentin did vary significantly among techniques (p < 0.05), with most extrusion occurring with the stepback techniques with circumferential (0.71 mg) and anticurvature (0.69 mg) filing and the least extrusion with the balanced force (0.38 mg) and crown-down pressureless (0.46 mg) techniques. Under the conditions of this study, it is concluded that techniques involving a filing (linear) motion caused significantly more blockages and extruded significantly more apical dentin debris.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
al-Omari MA,Dummer PMdoi
10.1016/s0099-2399(06)80443-7subject
Has Abstractpub_date
1995-03-01 00:00:00pages
154-8issue
3eissn
0099-2399issn
1878-3554pii
S0099-2399(06)80443-7journal_volume
21pub_type
杂志文章abstract:INTRODUCTION:The purpose of this investigation was to determine the effect that apical preparation size and preparation taper have on the volume of irrigant delivered at the working length for different canal curvatures using apical negative pressure irrigation. METHODS:One hundred fifty-five human teeth (55 maxillary...
journal_title:Journal of endodontics
pub_type: 杂志文章,随机对照试验
doi:10.1016/j.joen.2012.10.008
更新日期:2013-01-01 00:00:00
abstract:INTRODUCTION:This study addressed the following population, intervention, comparator, outcome, timing, study design and setting question: in patients with preoperative pain who undergo single-visit nonsurgical endodontic treatment, what is the comparative efficacy of corticosteroids compared with other analgesics or pl...
journal_title:Journal of endodontics
pub_type: 杂志文章,meta分析
doi:10.1016/j.joen.2018.05.015
更新日期:2018-09-01 00:00:00
abstract:INTRODUCTION:The aim of this study was to compare the fracture resistance of cast posts versus the fracture resistance of fiber posts by means of meta-analysis when they were used in the restoration of endodontically treated teeth. METHODS:MEDLINE, Cochrane Controlled Trials Register, China National Knowledge Infrastr...
journal_title:Journal of endodontics
pub_type: 杂志文章,meta分析,评审
doi:10.1016/j.joen.2012.09.026
更新日期:2013-01-01 00:00:00
abstract:INTRODUCTION:The aim of this study was to investigate the number of roots and the morphology of the root canals of maxillary and mandibular premolars in a selected German population. METHODS:Randomly selected full-size cone-beam computed tomographic images were collected from 700 patients (45% men and 55% women, avera...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2017.03.044
更新日期:2017-09-01 00:00:00
abstract:INTRODUCTION:The aim of this study was to evaluate the effect of calcium hydroxide (CH) and antibiotic pastes, including a mixture of metronidazole and ciprofloxacin, with and without minocycline or cefaclor, on the dislocation resistance of mineral trioxide aggregate (MTA) to root dentin. METHODS:Eighty single-rooted...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2014.08.018
更新日期:2014-12-01 00:00:00
abstract::Conventional and surgical endodontic management were performed on a two-rooted maxillary central incisor with a periapical lesion. Anatomical complexity of the tooth lead to perforation in the distal root during conventional treatment, thus a surgical approach was taken. A 4-month postoperative radiograph shows repair...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1097/00004770-200306000-00011
更新日期:2003-06-01 00:00:00
abstract::Teeth are vital sensory organs that contribute to our daily activities of living. Unfortunately, teeth can be lost for several reasons including trauma, caries, and periodontal disease. Although dental trauma injuries and caries are more frequently encountered in a younger population, tooth loss because of periodontal...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2019.05.014
更新日期:2019-12-01 00:00:00
abstract:INTRODUCTION:Pain present 6 months after root canal treatment (RCT) may be of odontogenic or nonodontogenic origin. This is important because treatments and prognoses are different; therefore, the aim of this study was to provide specific diagnoses of patients reporting pain 6 months after receiving initial orthograde ...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2014.12.012
更新日期:2015-04-01 00:00:00
abstract::In the present study, we investigated the effect of the addition of different grades of gum rosins and hydrogenated resins to Grossman cement on dimensional stability, solubility and disintegration. pH and conductivity, which may affect these properties, were also determined. The experiments were performed according t...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/S0099-2399(99)80284-2
更新日期:1999-07-01 00:00:00
abstract::The aim of this laboratory based study was to determine the shaping ability of Lightspeed nickel-titanium rotary instruments in simulated root canals. A total of 40 canals with four different shapes in terms of angle and position of curve were prepared with Lightspeed instruments using the stepback technique recommend...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/S0099-2399(97)80347-0
更新日期:1997-12-01 00:00:00
abstract::The cyclic fatigue resistance of three types of nickel-titanium rotary files was compared in a model using reciprocating axial movement. The influence of file size and taper was also investigated and fracture patterns were examined under SEM. The 10 experimental groups consisted of ProFiles, K3s, and RaCe files, size ...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2005.10.013
更新日期:2006-01-01 00:00:00
abstract:INTRODUCTION:The purpose of this study was to visualize the stresses and strain distribution patterns in ProTaper Universal F2 files (Dentsply Maillefer, Ballaigues, Switzerland) and to establish the stress- and strain-curvature relationship for this instrument under various conditions by using a dynamic, three-dimensi...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2011.06.003
更新日期:2011-10-01 00:00:00
abstract::Inflammatory myofibroblastic tumors (IMTs) are rare. IMTs of the head and neck occur in all age groups, from neonates to old age, with the highest incidence occurring in childhood and early adulthood. An IMT has been defined as a histologically distinctive lesion of uncertain behavior. This article describes an unusua...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2015.09.006
更新日期:2015-12-01 00:00:00
abstract:INTRODUCTION:This study aimed to evaluate the frequency of dentinal microcracks observed after root canal preparation with 2 reciprocating and a conventional full-sequence rotary system using micro-computed tomographic analysis. METHODS:Thirty mesial roots of mandibular molars presenting a type II Vertucci canal confi...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2014.02.019
更新日期:2014-09-01 00:00:00
abstract:INTRODUCTION:Pure gutta-percha (trans-1, 4-polyisoprene [TPI]) has been used extensively as a main component of gutta-percha for root canal filling. TPI has the interesting shape memory property by cross-linking, and this polymer was commercialized under the product name of SMP-2 (Kuraray Corp, Kashima, Japan). Therefo...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2014.05.003
更新日期:2014-10-01 00:00:00
abstract::In vitro root surface temperatures produced during post space preparation were measured. The preparations were made using a GPX bur with rotational speeds of 6,500, 8,000, 9,500, 11,000, and 15,000 rpm. The overall mean temperature increase ranged from 0.66 degree to 4.81 degrees C and was greatest at 8,000 rpm. When ...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/S0099-2399(96)80264-0
更新日期:1996-06-01 00:00:00
abstract:INTRODUCTION:Two groups of patients with orofacial pains that are clinically important to distinguish from each other are patients with odontogenic pain and temporomandibular disorder (TMD) pain. The aim of this study was to determine the sensitivity and specificity of 2 screening instruments in distinguishing between ...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2016.10.001
更新日期:2017-01-01 00:00:00
abstract:INTRODUCTION:The aim of this study was to evaluate the bond strength of different adhesive sealers on Resilon and gutta-percha. METHODS:Pellets of gutta-percha and Resilon were embedded into test tubes. Small eyelets were attached to those surfaces with a 0.5-mm film of different root canal sealers. Real Seal, Real Se...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2010.01.004
更新日期:2010-05-01 00:00:00
abstract:INTRODUCTION:Proteinases play pivotal roles in Candida albicans infections. Although the yeast can colonize the pulpal environment, there is no information about the enzymatic profile of this organism. This in vitro study aimed to determine the proteolysis levels and to investigate differences in the expression of aspa...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2015.01.012
更新日期:2015-06-01 00:00:00
abstract::The mesiobuccal roots of 50 randomly selected maxillary first molars were examined to assess the incidence and position of the canal isthmus. Transverse serial sections of the apical 6 mm of each root were prepared in 1-mm increments. The apical side of each section was stained with methylene blue dye, viewed with a s...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/s0099-2399(06)80975-1
更新日期:1995-07-01 00:00:00
abstract:INTRODUCTION:The aim of this study was to determine the variations in root canal length (RCL) occurring during endodontic treatment stages (initial, preflared, and concluded) and correlate them with the accuracy of Root ZX II (RZX). METHODS:After coronal access, 26 mandibular molars had the apical foramen of the 52 me...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2016.07.022
更新日期:2016-11-01 00:00:00
abstract:INTRODUCTION:The purpose of this study was to evaluate the efficacy and safety of postoperative medications in decreasing pain after nonsurgical endodontic treatment using a network meta-analytic approach. METHODS:MEDLINE, Embase, CENTRAL, CINAHL, and Scopus were searched (until July 31, 2019). Two reviewers selected ...
journal_title:Journal of endodontics
pub_type: 杂志文章,meta分析
doi:10.1016/j.joen.2020.07.002
更新日期:2020-10-01 00:00:00
abstract::The purpose of this study was to evaluate the influence of Hero 642 rotary Ni-Ti instruments driven at 300, 400, or 600 rpm on root canal straightening, loss of working length, and instrument breakage. Sixty mesial root canals from extracted human mandibular molars were divided into 3 groups of 20 each and were instru...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1097/00004770-200307000-00005
更新日期:2003-07-01 00:00:00
abstract::The purpose of this study was to quantify the amount of remaining gutta-percha/sealer after retreatment of post space prepared teeth obturated with a lateral condensation technique or with Thermafil with plastic and metallic carrier. The time required for retreatment was also recorded. Forty-five extracted mandibular ...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/s0099-2399(06)80019-1
更新日期:1994-01-01 00:00:00
abstract:INTRODUCTION:A ferrule on anterior endodontic-treated teeth has been evaluated using clinical trials, in vitro tests, and finite element analysis (FEA). The patient-specific FEA with a nonuniform ferrule and nonlinear contact biting load associated with clinical validation can be used to predict failure. METHODS:A pat...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2017.04.024
更新日期:2017-09-01 00:00:00
abstract:INTRODUCTION:This study aimed to examine the dynamic recovery of established multispecies biofilms of oral bacteria after an initial treatment by D-enantiomeric peptide DJK-5, L-enantiomeric peptide 1018, or chlorhexidine digluconate (CHX). METHODS:Oral biofilms from 2 donors were grown on collagen-coated hydroxyapati...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/j.joen.2020.11.020
更新日期:2020-11-25 00:00:00
abstract::A technique utilizing fiberoptics to transilluminate a beveled root surface during periradicular surgery is described. This procedure when integrated with other standard endodontic surgical aids may help diagnose apical variations and vertical root fractures. ...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1016/S0099-2399(06)80301-8
更新日期:1994-08-01 00:00:00
abstract::This study investigated the retreatment effectiveness of .04 Taper nickel-titanium rotary ProFiles. Thirty extracted single-rooted anterior teeth were instrumented and obturated with gutta-percha/Roth's Sealer using lateral condensation. They were distributed into three groups of 10 each. Retreatment for group A was d...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1097/00004770-200002000-00010
更新日期:2000-02-01 00:00:00
abstract::Whole genome DNA-DNA hybridization has been used to identify bacteria in periradicular lesions partly because there is no amplification of the bacteria, therefore, minor contaminants are not detected. There are, however, potential pitfalls with this technique, including inability to distinguish dead bacteria, cross-re...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1097/00004770-200407000-00014
更新日期:2004-07-01 00:00:00
abstract::The purpose of this study was to compare the wicking propensity of multifilament sutures. Dexon II, Vicryl, and black silk suture (BSS) were dipped in saline or soaked for 48 h, then suspended on a microscope slide. Fluorescein isothiocyanate-dextran (FITC-D) was placed at the suture mid points, and its movement was o...
journal_title:Journal of endodontics
pub_type: 杂志文章
doi:10.1097/01.don.0000121617.67923.05
更新日期:2004-09-01 00:00:00