Abstract:
:The aim of this study was to assess the shaping ability of the M4 reciprocating handpiece and Safety Hedstrom files in simulated canals. A total of 40 simulated canals of various angles and positions of curvature were prepared with an M4 handpiece using Safety Hedstrom files oriented with the ground, flattened surface towards the inner aspect of the curve. A standard regimen was adopted throughout. Pre- and post-operative longitudinal images of the canals were taken with a video camera and stored and manipulated in a computer with image analysis software. The presence of canal aberrations and the amount and location of resin material removed as a result of preparation were determined from composite images of superimposed pre- and post-operative views. Preparation time varied significantly (P < 0.001) between the canal types; overall, 20 degrees canals were prepared more quickly than 40 degrees canals. Zips and elbows were observed in 16 out of the 40 canals with most (11) being created in 40 degrees specimens. Ledges were found in 19 canals and perforations in only 1. There were no significant differences between canal shapes for these aberrations. Excessive removal of material from the inner aspect of the canal at the curve to create a danger zone was found in 20 canals, but only in those with 40 degrees curves. Significant differences in total canal width between the canal types were seen at the zips (P < 0.05), elbows (P < 0.05) and danger zones (P < 0.001). Transportation at the danger zones varied significantly (P < 0.001) between canal types. Under the conditions of this study, the M4 handpiece and Safety Hedstrom files created hour-glass preparations in a substantial proportion of canals. In reality, the Safety Hedstrom file with its one flattened surface was ineffective at reducing removal of material along the inner aspect of canal curves in severely curved specimens and clearly has the potential to create strip perforations in teeth.
journal_name
Int Endod Jjournal_title
International endodontic journalauthors
Lloyd A,Jaunberzins A,Dhopatkar A,Bryant S,Dummer PMdoi
10.1111/j.1365-2591.1997.tb01094.xsubject
Has Abstractpub_date
1997-01-01 00:00:00pages
16-24issue
1eissn
0143-2885issn
1365-2591journal_volume
30pub_type
杂志文章abstract:AIM:To introduce and assess a novel method for measuring washout resistance of cement-based dental materials, including mineral trioxide aggregate (MTA), to qualitatively verify the results with a clinical simulation and to evaluate the washout resistance of a new root-end filling material. METHODOLOGY:A method for as...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2012.02108.x
更新日期:2013-02-01 00:00:00
abstract:AIM:To evaluate the influence of delayed scanning on images obtained with two PSPs digital systems and on the diagnostic accuracy of vertical root fracture (VRF) by means of objective and subjective analyses. METHODOLOGY:Forty single-rooted human teeth were divided into two groups, one without VRFs and another with VR...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12547
更新日期:2016-10-01 00:00:00
abstract:AIM:To compare the detectability of residual Epiphany and gutta-percha after root canal retreatment using a dental operating microscope and radiographic examination with the residual area measured after rendering the roots transparent. METHODOLOGY:Sixty extracted single-rooted maxillary central incisor teeth were enla...
journal_title:International endodontic journal
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1365-2591.2006.01126.x
更新日期:2006-07-01 00:00:00
abstract:AIM:To compare the antibacterial activity of 2-hydroxyisocaproic acid (HICA) with currently used root canal medicaments and to examine their interactions with potential inhibitors in nutrient-deficient and nutrient-rich conditions. METHODOLOGY:First, the antibacterial activity of single concentrations of HICA, calcium...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12465
更新日期:2016-04-01 00:00:00
abstract:AIM:To compare canal and isthmus debris debridement efficacies of the manual dynamic irrigation (MDI) and apical negative pressure (ANP) techniques in the mesial root of mandibular first molars with narrow isthmi, using a closed canal design. METHODOLOGY:Micro-computed tomography was employed to select 20 teeth, each ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2010.01778.x
更新日期:2010-12-01 00:00:00
abstract:AIM:To describe some toxic effects of arsenic trioxide in the mouth, to condemn its continued use, and present a case in which a tooth was preserved despite significant bony destruction. SUMMARY:A case is presented in which severe alveolar bone necrosis resulted from leak-age of an arsenical devitalization paste into ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2002.00491.x
更新日期:2002-03-01 00:00:00
abstract:AIM:To compare the antibacterial properties and toxicity of 5.25% sodium hypochlorite (NaOCl), 2% chlorhexidine gluconate and 0.2% chlorhexidine gluconate plus 0.2% cetrimide (Cetrexidin); Vebas, San Giuliano, Milan, Italy). METHODOLOGY:The antibacterial effects of the irrigants in vitro were examined after 5 min and ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2003.00673.x
更新日期:2003-06-01 00:00:00
abstract:AIM:To investigate the apical anatomy of C-shaped canal systems in mandibular second molars by micro-computerized tomography (microCT) and stereomicroscopy. METHODOLOGY:Forty-four permanent mandibular second molars with a C-shaped root canal systems from a native Chinese population were scanned at 100 microm intervals...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2007.01193.x
更新日期:2007-04-01 00:00:00
abstract:AIM: To discuss the clinical and radiographic success of a pulpotomy with second-generation platelet concentrate (PRF), in a human mature permanent molar tooth. SUMMARY: A 19-year-old female patient reported to the Department of Conservative Dentistry and Endodontics with established pulpitis in tooth 36. The tooth ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2011.01973.x
更新日期:2012-01-01 00:00:00
abstract::The assurance of the quality of a service rendered by a member of the dental profession is an essential feature of any system of peer review in dentistry. This document addresses two essential elements: (i) appropriateness of treatment modality and (ii) quality or level of treatment rendered. In revising these guideli...
journal_title:International endodontic journal
pub_type: 共识发展会议,杂志文章,实务指引
doi:10.1111/j.1365-2591.2006.01180.x
更新日期:2006-12-01 00:00:00
abstract:AIM:The present randomized, controlled prospective study evaluated the histomorphological response of human dental pulps capped with two grey mineral trioxide aggregate (MTA) compounds. METHODOLOGY:Pulp exposures were performed on the occlusal floor of 40 human permanent pre-molars. The pulp was capped either with Pro...
journal_title:International endodontic journal
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1365-2591.2008.01485.x
更新日期:2009-02-01 00:00:00
abstract:AIM:To evaluate the effect of citric acid, ethylenediaminetetraacetic acid (EDTA) and ethylenediaminetetraacetic acid plus Cetavlon (EDTAC) solutions on the microhardness of human root canal dentine. METHODOLOGY:Sixteen maxillary human canines were sectioned transversely at the cemento-enamel junction and the crowns w...
journal_title:International endodontic journal
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1365-2591.2006.01094.x
更新日期:2006-05-01 00:00:00
abstract:AIM:To determine factors that may influence treatment outcome and healing time following root canal treatment. METHODOLOGY:Root filled and restored teeth by pre-doctoral students were included in this study. Teeth/roots were followed-up regularly, and treatment outcome was evaluated at every follow-up appointment (hea...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12429
更新日期:2016-01-01 00:00:00
abstract::Four hundred and fifty-five extracted mandibular incisor and 340 extracted mandibular premolar teeth were radiographed to assess the incidence of twin canals as visualized on radiographs taken in the mesio-distal direction. The ability to detect the presence of these twin canals by viewing radiographs taken in the sta...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.1991.tb00808.x
更新日期:1991-03-01 00:00:00
abstract:AIM:To investigate amongst Greek endodontists the prevalence and characteristics of musculoskeletal disorders (MSDs) in the past 12 months, the treatment followed, their postures during practice and the adoption of ergonomic standards. METHODOLOGY:One hundred and forty-seven endodontists met the inclusion criteria and...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12219
更新日期:2014-08-01 00:00:00
abstract:AIM:To develop a convenient method for the localization and quantification of live and dead bacteria in human ex vivo mineralized dentinal tubules. METHODOLOGY:The roots from human single-rooted teeth (n = 12) were infected with Enterococcus faecalis V583 and either treated with calcium hydroxide paste or left untreat...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2011.01867.x
更新日期:2011-07-01 00:00:00
abstract:AIM:To present a tactile method for working length determination in teeth with open apices and to determine its accuracy and repeatability. METHODOLOGY:Ninety teeth with 129 root canals were prepared to create open apices. The correct working length (CWL) for each canal was determined by introducing a file into the ro...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2009.01636.x
更新日期:2009-12-01 00:00:00
abstract:AIM:To evaluate the frequency of dentinal microcracks after ultrasonic removal of fractured files from the middle third of root canals using micro-computed tomography (micro-CT). METHODOLOGY:Eighteen bilaterally matched pairs of human mandibular incisors extracted for periodontal reasons were included. The matched pai...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12909
更新日期:2018-09-01 00:00:00
abstract:AIM:To compare the shaping ability of ProTaper Next, iRaCe and Hyflex CM rotary NiTi files during the preparation of severely curved root canals in extracted human molar teeth. METHODOLOGY:Sixty mandibular molars with mesio-buccal canals having angles of curvature ranging from 25° to 35° were divided according to the ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12291
更新日期:2015-02-01 00:00:00
abstract:AIM:To describe combined endodontic, surgical and orthodontic treatment of a maxillary lateral incisor fused with a supernumerary. SUMMARY:Double tooth is a dental irregularity consequent to fusion of two or more teeth or dental gemination. The teeth most commonly involved are deciduous, but in 0.1% of cases permanent...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2008.01391.x
更新日期:2008-06-01 00:00:00
abstract:AIM:To evaluate the effect of a calcium aluminate-based cement (CAC+) on the development of the osteogenic phenotype in vitro. METHODOLOGY:Rat calvaria-derived cells were grown on Thermanox® coverslips for 24 h and then exposed to either samples (4-h set) of CAC+ or mineral trioxide aggregate (MTA) placed on Transwell...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12682
更新日期:2017-08-01 00:00:00
abstract::Root-canal-filling materials are either placed directly onto vital periapical tissues or may leach through dentine. The tissue response to these materials therefore becomes important and may influence the outcome of endodontic treatment. This paper is a review of the biocompatibility of contemporary orthograde and ret...
journal_title:International endodontic journal
pub_type: 杂志文章,评审
doi:10.1046/j.1365-2591.2003.00637.x
更新日期:2003-03-01 00:00:00
abstract::A case is described in which root canal treatment with calcium hydroxide was used successfully to repair a fracture site with internal resorption of the tooth. ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.1996.tb01404.x
更新日期:1996-11-01 00:00:00
abstract:AIM:To engineer systems using polyisoprene (PI) or polycaprolactone (PCL) and nanometric bioactive glass 45S5 (BG) that could create a hydroxyapatite interface and thus ultimately make the use of an endodontic sealer unnecessary. METHODOLOGY:Different composites using PI or PCL as matrix material were prepared with BG...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2010.01772.x
更新日期:2010-11-01 00:00:00
abstract:AIM:This study was undertaken to determine the incidence of root fractures during post removal, as well as the methods used and the success rates achieved with various post removal devices and techniques. METHODOLOGY:Patient records from a specialist endodontic practice were examined. A total of 1600 teeth from which ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2002.00457.x
更新日期:2002-01-01 00:00:00
abstract:AIM:The aim of this study was to determine the shaping ability of Quantec LX nickel-titanium rotary instruments in simulated root canals. METHODOLOGY:Forty simulated canals consisting of four different shapes in terms of angle and position of curvature were prepared with Quantec LX instruments. Sequential still images...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2000.00311.x
更新日期:2000-07-01 00:00:00
abstract:AIM:To evaluate the bond strength of self-adhesive resin cements (SARCs) to glass fibre posts with or without a silane coupling agent. METHODOLOGY:The SARCs tested were: Maxcem Elite (MXE; Kerr), RelyX Unicem clicker (UNI; 3M ESPE), seT capsule (SET; SDI), and SmartCem 2 (SC2; Dentsply Caulk). The conventional cement ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2011.01883.x
更新日期:2011-08-01 00:00:00
abstract:AIM:To test the chemical-physical properties and apatite-forming ability of experimental fluoride-doped calcium silicate cements designed to create novel bioactive materials for use in endodontics and oral surgery. METHODOLOGY:A thermally treated calcium silicate cement (wTC) containing CaCl(2) 5%wt was modified by ad...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2011.01907.x
更新日期:2011-10-01 00:00:00
abstract:AIM:To evaluate the cytotoxicity and the mechanism of cell aggression of peracetic acid (PA) in comparison with sodium hypochlorite (NaOCl). METHODOLOGY:L929 fibroblasts were exposed to 1% PA and 2.5% NaOCl, at several dilutions for 10 min. The following parameters were evaluated: cell metabolism by methylthiazol tetr...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12750
更新日期:2018-05-01 00:00:00
abstract:AIM:To determine the influence of various irrigating solutions on the accuracy of the electronic apex locator facility in the Tri Auto ZX handpiece. METHODOLOGY:One hundred and forty teeth with single canals and mature apices, scheduled for extraction for either periodontal or prosthetic reasons in 76 patients were us...
journal_title:International endodontic journal
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1365-2591.2007.01234.x
更新日期:2007-05-01 00:00:00