Abstract:
AIM:To evaluate the effect of repeated sterilization cycles in dry oven or autoclave, on the mechanical behaviour and fatigue resistance of rotary endodontic Ni-Ti instruments. METHODOLOGY:New Ni-Ti instruments were subjected to five consecutive sterilization cycles in a dry oven or steam autoclave. Microhardness was measured in the nonmachined parts of the shanks of instruments using a Vickers indenter. Specimens of Ni-Ti wires were submitted to the same sterilization protocol and tensile tested until rupture. A group of instruments were fatigued to one half of their average fatigue life and then sterilized. New and sterilized instruments were fatigue tested until rupture. anova tests at alpha = 0.05 were used for statistical analysis. RESULTS:Sterilization procedures resulted in no significant changes in Vickers microhardness, nor in the parameters describing the mechanical behaviour of the wires. However, the number of cycles to failure was statistically higher for all instruments after dry heat or autoclave sterilization cycles. In the instruments previously fatigued to one half of their fatigue life, autoclave sterilization gave rise to an increase of 39% in the remaining number of cycles to failure. CONCLUSIONS:Changes in the mechanical properties of Ni-Ti endodontic instruments after five cycles of commonly used sterilization procedures were insignificant. The sterilization procedures are safe as they produced a significant increase in the fatigue resistance of the instruments.
journal_name
Int Endod Jjournal_title
International endodontic journalauthors
Viana AC,Gonzalez BM,Buono VT,Bahia MGdoi
10.1111/j.1365-2591.2006.01138.xsubject
Has Abstractpub_date
2006-09-01 00:00:00pages
709-15issue
9eissn
0143-2885issn
1365-2591pii
IEJ1138journal_volume
39pub_type
杂志文章abstract:AIM:To investigate a potential cause-effect relationship between dentinal microcracks and fracture resistance of mandibular incisors that had not been endodontically treated. METHODOLOGY:Sixty mandibular incisors with circular-shaped canals were selected based on micro-computed tomographic scans to create a homogeneou...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.13370
更新日期:2020-11-01 00:00:00
abstract:AIM:To evaluate the radiopacity of calcium hydroxide-based root canal sealers (Acroseal, Sealapex and Sealer 26), a glass-ionomer-based sealer (Activ GP Sealer) and a zinc oxide and eugenol-based sealer (Intrafill). METHODOLOGY:Five disc-shaped specimens (10 x 1 mm) were fabricated from each material, according to the...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2007.01309.x
更新日期:2008-01-01 00:00:00
abstract::Thirty single-rooted teeth were prepared to receive cast posts. After cementation of the post the teeth were divided into three groups. Group I did not receive any treatment, whereas the posts in groups II and III were treated with an ultrasonic device, for 2 min and 5 min, respectively. The force required for post re...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.1995.tb00157.x
更新日期:1995-01-01 00:00:00
abstract::The aim of this report is to (i) review the current literature on the status of root filled teeth, (ii) analyse the most important factors in decision-making, (iii) discuss the current restorative concepts, and (iv) classify both the evidence and clinical practice in a way that seeks to be clear, understandable and he...
journal_title:International endodontic journal
pub_type: 杂志文章,评审
doi:10.1111/iej.12847
更新日期:2018-03-01 00:00:00
abstract:AIM:The Bramante method was used to study how the natural curvature of root canals was modified when using the Hero 642 nickel-titanium rotary system. METHODOLOGY:Twenty-four canals were selected in freshly extracted human mandibular molars. Every root canal had an angle of curvature greater than 20 degrees. Roots wer...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2001.00440.x
更新日期:2001-12-01 00:00:00
abstract:AIM:To evaluate the physical and mechanical properties of two cements with a similar chemical composition to mineral trioxide aggregate and to attempt to improve their properties by producing a composite material. METHODOLOGY:Two cement types were used: a mixture of calcium sulpho-aluminate cement and Portland cement ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2008.01435.x
更新日期:2008-10-01 00:00:00
abstract:AIM:To investigate the use of a zinc oxide/zinc sulphate-based cement (Coltosol(®) F, Coltène Whaledent, Cuyahoga Falls, OH, USA) as a temporary filling material during multiple-visit root canal treatments and the occurrence of cracks within the filling material or the tooth. METHODOLOGY:Root canals of one hundred and...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12280
更新日期:2015-01-01 00:00:00
abstract:AIM:To compare ex vivo the accuracy of two impedance quotient apex locators with different scales and frequencies of the measuring circuit. METHODOLOGY:In each root of 193 extracted human teeth, electronic working length determination (ELD) was carried out with a newly constructed measuring unit. In all cases, ELD was...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2005.01004.x
更新日期:2005-12-01 00:00:00
abstract:AIM:To investigate the prevalence of Porphyromonas gingivalis in root canals of infected teeth with periapical abscesses and to investigate the antimicrobial susceptibility of this species to some frequently prescribed antibiotics. METHODOLOGY:Samples were obtained from 70 root canals of abscessed teeth. Microbial sam...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2005.01053.x
更新日期:2006-01-01 00:00:00
abstract:AIM:To apply a standardized protocol for the orofacial evaluation of two adult siblings (one male and one female) with Hereditary Sensory Radicular Neuropathy (HSRN) that presented with dental problems. SUMMARY:The systematic evaluation consisted of (a) clinical questionnaire; (b) radiographs [orthopantomography and c...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2006.01160.x
更新日期:2006-11-01 00:00:00
abstract::The aim of designing and fabricating the surgical templates was to assist the surgical component of premolar transplantation, by establishing and replicating the root dimensions of the donor premolar tooth. The correct template could be used to assess the socket preparation (width and depth) prior to placement of the ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2012.02077.x
更新日期:2012-11-01 00:00:00
abstract:AIM:To evaluate the wear of root wall surfaces, the bond strength of sealers to dentine and the demineralization around root filling materials after canals were exposed to acid challenge in situ. METHODOLOGY:Eighty-seven roots of mandibular incisors were selected. Thirty-two were used in the laboratory bond strength s...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12858
更新日期:2018-03-01 00:00:00
abstract:AIM:To evaluate the adhesive strength of Resilon to Next root canal sealant (Heraeus-Kulzer), a methacrylate-based root canal sealer, using a modified microshear bond testing design. METHODOLOGY:Flat Resilon surfaces of different roughnesses (smooth surface and surface roughness equivalent to 320-grit and 180-grit) we...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2005.01012.x
更新日期:2005-10-01 00:00:00
abstract:AIM:The purpose was to present the frequency of periapical healing in first and second/third mandibular molars, after root-end resections sealed with a dentine-bonded resin composite. METHODOLOGY:Root-end sealing of resected mandibular molar roots was made with dentine-bonded composite (Gluma-Retroplast) as a cover on...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2001.00383.x
更新日期:2001-06-01 00:00:00
abstract:AIM:To compare the cyclic fatigue resistance of ProTaper Next files (PTN; Dentsply Maillefer, Ballaigues, Switzerland) with Twisted Files (TF; SybronEndo, Orange, CA, USA), HyFlex CM (HF; ColténeEndo/Whaledent, Inc, Cuyahoga Falls, OH, USA) and ProTaper Universal (PT; Dentsply Maillefer). METHODOLOGY:Size 25, .06 tape...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12244
更新日期:2014-11-01 00:00:00
abstract::Dentoalveolar ankylosis is a common complication after replantation of teeth with injured periodontal ligaments. This is a serious complication for the tooth since it leads to progressive root resorption. In young individuals it may also cause infra-occlusion and reduced development of the alveolar process. The purpos...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.1993.tb00549.x
更新日期:1993-03-01 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:To compare the incidence of dentinal defects caused by reciprocating and rotary techniques during retreatment procedures. METHODOLOGY:One hundred and twenty extracted mandibular premolars with single canals were selected. Twenty teeth were left unprepared. The root canals in the remaining 100 teeth were prepared w...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12387
更新日期:2015-10-01 00:00:00
abstract:AIMS:(i) To compare the prevalence of extrusion of root filling material when placed using different root filling techniques, with or without customization of the master gutta-percha (GP) cone; and (ii) to investigate the effects of some factors influencing root filling extrusion and presence of voids. METHODOLOGY:A t...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2005.01005.x
更新日期:2005-09-01 00:00:00
abstract:AIM:To investigate interfacial stress distribution in restored root filled teeth with various post lengths and crown heights. METHODOLOGY:Three-dimensional mathematical models of a root filled mandibular premolar tooth were constructed. Parts of the tooth structures were replaced with ceramic crowns having three crown...
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pub_type: 杂志文章
doi:10.1111/iej.12397
更新日期:2015-11-01 00:00:00
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pub_type: 杂志文章
doi:10.1111/iej.12386
更新日期:2015-09-01 00:00:00
abstract:AIM:To determine whether the outcome of cone beam computed tomography (CBCT) examinations performed in accordance with the European Commission guidelines in a clinical setting has an impact on choosing diagnoses in endodontics. METHODOLOGY:A prospective observational study was conducted. Fifty-three consecutive patien...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/iej.12350
更新日期:2015-06-01 00:00:00
abstract::When operated in air, the sonic endodontic instrument produced a movement at the driver head which resulted in a large elliptical oscillation of the file. This motion had similar properties to ultrasonically operated files in that there was a distinct variability in the magnitude of the vibratory motion between files ...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.1989.tb00910.x
更新日期:1989-05-01 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:AIMS:The aims of this study were to investigate the pattern of transmission of laser light through carious human molar teeth, and to examine the effect on light transmission of reactions to caries in the dentine. METHODOLOGY:Sectioned carious human molars were examined whilst illuminated from their external surfaces b...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.2001.00428.x
更新日期:2001-10-01 00:00:00
abstract:AIM:To evaluate ex vivo the accuracy of two electronic apex locators during root canal length determination in primary incisor and molar teeth with different stages of physiological root resorption. METHODOLOGY:One calibrated examiner determined the root canal length in 17 primary incisors and 16 primary molars (total...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2007.01366.x
更新日期:2008-04-01 00:00:00
abstract:AIM:To develop a precise and simple mounting model (MM) for evaluating apex locators and to compare the repeatability of the MM with a conventional visual method (VM). METHODOLOGY:Electronic working length determination was performed in 32 maxillary central incisors using two methods: (i) the MM method and (ii) a conv...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2006.01052.x
更新日期:2006-02-01 00:00:00
abstract:AIM:To determine the influence of filling technique and root canal area on the percentage of gutta-percha (PGP) in laterally compacted root fillings. METHODOLOGY:Sixty extracted canine teeth were accessed and the root canals instrumented to the same size. They were then divided in three groups and filled with laterall...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.2009.01575.x
更新日期:2009-08-01 00:00:00
abstract::Vertical root fractures in endodontically treated teeth occur frequently in teeth or roots in which their mesiodistal dimension is narrow, such as the maxillary upper premolars. Two cases of vertical root fractures in two adjacent maxillary reconstructed teeth are presented. As in many cases of vertical root fractures...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1046/j.1365-2591.1998.00129.x
更新日期:1998-03-01 00:00:00
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...
journal_title:International endodontic journal
pub_type: 杂志文章
doi:10.1111/j.1365-2591.1997.tb01094.x
更新日期:1997-01-01 00:00:00