Abstract：
:The purpose of this in vitro study was to investigate the canal configuration types, and the prevalence and location of anatomical variations in the mesiobuccal (MB) and mesial roots of permanent maxillary and mandibular first molars after instrumentation. The number and the type of canals were determined before instrumentation using conventional methods. All root canals from the 47 MB roots and 42 mesial roots were then instrumented to size #30 with ProFile .04 taper rotary instruments in a crown-down method and then filled with a single gutta-percha cone and sealer. Transverse 1 mm-thick cross-sections at 2, 3, 4, and 5 mm from the apex were obtained, stained and examined using a stereomicroscope. The canal configuration types and the prevalence and location of isthmi and accessory canals in roots with two canals were evaluated. The prevalence of two canals was 80.8% in the maxillary MB roots and 95.2% in the mandibular mesial roots. There were six types of canal configurations in the instrumented root apices. The prevalence of anatomical variations was highest at the apical 4 mm level, and was more frequent in mandibular first molars, and in roots with Weine type III canal. chi test showed that the prevalence of the anatomical variations was statistically higher in the maxillary MB roots with Weine type III canals than in those with Weine type II canals (p < 0.05). Different canal configurations were often found at different levels in the same root. The results indicate that anatomical variations persist following instrumentation of roots with two canals in first molars. These anatomical variations should be considered during surgical or nonsurgical endodontic procedures of the permanent first molars.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Jung IY,Seo MA,Fouad AF,Spångberg LS,Lee SJ,Kim HJ,Kum KYdoi
10.1097/01.don.0000145425.73364.91keywords:
subject
Has Abstractpub_date
2005-05-01 00:00:00pages
364-8issue
5eissn
0099-2399issn
1878-3554pii
S0099-2399(05)60171-9journal_volume
31pub_type
杂志文章abstract：:An in vitro study was conducted to determine the susceptibility of the yeast Candida albicans to various intracanal irrigants and medications. The minimum inhibitory concentration (MIC) of sodium hypochlorite, hydrogen peroxide, chlorhexidine digluconate, and aqueous calcium hydroxide that is required to kill a standa...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200202000-00004
更新日期：2002-02-01 00:00:00
abstract：:The aim of this review was to consider laboratory experiments and clinical studies of calcium hydroxide-based root canal sealers. An extensive search of the endodontic literature was made to identify publications related to calcium hydroxide-based root canal sealers. The articles were assessed for the outcome of labor...
journal_title：Journal of endodontics
pub_type： 杂志文章,评审
doi：10.1016/j.joen.2008.11.026
更新日期：2009-04-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to determine factors and clinical situations that influence an endodontist's decision to use guided tissue regeneration (GTR) techniques during endodontic root-end surgery. METHODS:An invitation to participate in a web-based survey was e-mailed to 3,750 members of the America...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2011.08.017
更新日期：2011-11-01 00:00:00
abstract：:Ten extracted human maxillary first molars were selected with a variety of root curvatures. The distofacial roots were resected and the mesiofacial canals were instrumented to a size #25 K file. Three techniques were used to introduce Ca(OH)2 paste into the instrumented canals. These techniques were evaluated for thei...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/s0099-2399(06)81220-3
更新日期：1992-08-01 00:00:00
abstract：:Cytotoxicity was compared between new root canal sealers (New A, New B, and New B-2) and conventional root canal sealers (AH26, Diaket, Canals, Tubi-Seal, and Sealapex). Dental pulp cells of rats, obtained through primary cell culture, were used. In the experiments with the freshly prepared sealers, the incorporation ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/S0099-2399(89)80109-8
更新日期：1989-02-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to compare the cell viability of dental pulp cells treated with Biodentine (Septodont, Saint-Maur, France) and mineral trioxide aggregate (MTA) and the in vitro and in vivo expression of mineralization markers induced by the 2 materials. METHODS:Human dental pulp cells isolat...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2015.12.018
更新日期：2016-04-01 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：:An examination of 5616 endodontically treated and retreated maxillary first and second molars was made in an attempt to determine the percentage of MB2 canals that could be located routinely, and evaluate if there were any significant differences between initial treatments and retreatments. The teeth examined were 357...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/01.don.0000140581.38492.8b
更新日期：2005-04-01 00:00:00
abstract：:Atypical odontalgia is characterized by prolonged periods of throbbing or burning pain in the teeth or alveolar process, which occurs in the absence of any identifiable odontogenic etiology. The pain may be bilateral and change in location. This article presents two cases of atypical odontalgia that were misdiagnosed ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/S0099-2399(97)80419-0
更新日期：1997-05-01 00:00:00
abstract：INTRODUCTION:The aim of this prospective study was to evaluate the postoperative pain that followed root canal treatments performed with a single-file reciprocating system on asymptomatic uniradicular necrotic teeth with and without foraminal enlargements (FEs). METHODS:Forty-six volunteers were randomly divided into ...
journal_title：Journal of endodontics
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.joen.2015.09.018
更新日期：2016-01-01 00:00:00
abstract：INTRODUCTION:During the dental pulp repair process, human dental pulp cells (HDPCs) migrate to injury sites where they may differentiate into odontoblastlike cells. WNT6 plays a role in dental development and can activate a noncanonical pathway including the c-Jun N-terminal kinase (JNK) pathway. The mechanism of WNT6 ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2013.12.023
更新日期：2014-07-01 00:00:00
abstract：:The purpose of this study was to compare intracanal bacterial reduction on teeth instrumented with 0.04 tapered nickel-titanium (NiTi) rotary instrumentation to bacterial reduction when using a stainless-steel K-file step-back technique using sterile saline irrigation. Forty-eight patients with apical periodontitis we...
journal_title：Journal of endodontics
pub_type： 临床试验,杂志文章,随机对照试验
doi：10.1016/S0099-2399(98)80170-2
更新日期：1998-11-01 00:00:00
abstract：:The purpose of this study was to compare torque force and rotation needed to fracture three types of nickel titanium alloy rotary instruments in a simulated curved root canal space that were bound at the file tip. Files of similar size tips were studied. The files studied were ProFiles with 0.04 taper diameters of 15,...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/01.don.0000148867.30520.9e
更新日期：2005-06-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to evaluate and compare the centering ability and canal transportation of the ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland) and Self-adjusting File (SAF; ReDent-Nova, Ra'anana, Israel) systems in long oval root canals using cone-beam computed tomography imag...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2019.07.007
更新日期：2019-10-01 00:00:00
abstract：INTRODUCTION:This study examined the dynamic fracture behavior of nickel-titanium rotary instruments in torsional or cyclic loading at continuous or reciprocating rotation by means of high-speed digital video imaging. METHODS:The ProFile instruments (size 30, 0.06 taper; Dentsply Maillefer, Ballaigues, Switzerland) we...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2017.03.024
更新日期：2017-08-01 00:00:00
abstract：:This study highlighted the characteristics and distribution of cracked tooth syndrome (CTS) and the associated factors in adult attendees in the University of Nigeria Teaching Hospital. Three hundred seventy patients aged 18 years to 77 years with CTS-like conditions were included and studied over 12 months. The follo...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2008.12.011
更新日期：2009-03-01 00:00:00
abstract：INTRODUCTION:A number of factors affect the dimensional stability of a material. These factors include curing conditions, material solubility, leaching, and time. The aim of this study was to evaluate the restrained dimensional change in the vertical direction as a function of the ambient conditions, fluid uptake, solu...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2010.11.012
更新日期：2011-02-01 00:00:00
abstract：INTRODUCTION:The health of human teeth depends on the integrity of the hard tissue and the activity of the pulp and periodontal tissues, which are responsible for nutritional supply. Without the nourishing of the pulp tissue, the possibility of tooth fracture can increase. In immature permanent teeth, root development ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2012.10.002
更新日期：2013-02-01 00:00:00
abstract：:The polymerase chain reaction (PCR) is an innovative nucleic acid-based assay that has the highest sensitivity of any microbiological technique for the detection of bacteria. The purpose of this study was to use PCR to detect the presence of specific species of bacteria in samples collected from two geographical locat...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200403000-00004
更新日期：2004-03-01 00:00:00
abstract：:The treatment of an undeveloped (immature) tooth with a carious exposure has been reported extensively in the literature. The main objective of treatment is to provide vital pulp therapy to allow continued development of root dentin in the hope that the root will attain full maturity. A case report is presented that i...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200311000-00022
更新日期：2003-11-01 00:00:00
abstract：INTRODUCTION:Experimental studies show that dental pulp cells respond unfavorably to contact with resin composite restorative material. Hypothetically, in a random population, the frequency of apical periodontitis should be higher for teeth restored with resin composite than with amalgam. Therefore, the aim was to comp...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2014.05.002
更新日期：2014-09-01 00:00:00
abstract：:The putative hazardous nature of chloroform and xylene implies that safer substitutes should be considered. Standard cylindrical gutta-percha samples were immersed in Hemo-De, a xylene substitute, for 60 s at 37 degrees C. Weight loss of a sample, after drying, was used as a measure of its solubility. Master and acces...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200007000-00001
更新日期：2000-07-01 00:00:00
abstract：:A comparison of the microleakage of mineral trioxide aggregate (MTA) and a high copper admix amalgam (Valiant PhD) in root-end preparations was made using a fluid conductive device. Thirty-three bilaterally matched pairs of extracted, single-rooted teeth were prepared and obturated using lateral compaction of gutta-pe...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/S0099-2399(98)80160-X
更新日期：1998-11-01 00:00:00
abstract：INTRODUCTION:Autotransplantation is a viable option for treating missing teeth when a donor tooth is available. This retrospective study reports the success rate for the autotransplantation of 19 molars with complete root formation. METHODS:The study enrolled 19 patients (11 men and 8 women) in whom 19 molars were tra...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2010.04.028
更新日期：2010-08-01 00:00:00
abstract：INTRODUCTION:Idiopathic bone cavity (IBC) is an uncommon bone lesion that usually affects youngsters as an unilocular radiolucency with predilection for the posterior mandible. Because the lesion is frequently located in proximity to the adjacent teeth, chronic apical periodontitis is commonly included as a differentia...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2020.11.004
更新日期：2021-02-01 00:00:00
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 wi...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/s0099-2399(06)80443-7
更新日期：1995-03-01 00:00:00
abstract：:Mineral Trioxide Aggregate (MTA) has been shown in a number of experiments to be a potential root-end filling material. The purpose of this study was to examine the periradicular tissue response of monkeys to MTA and amalgam as root-end fillings. The pulps were removed from all the maxillary incisors of three monkeys....
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/S0099-2399(97)80051-9
更新日期：1997-04-01 00:00:00
abstract：:The purpose of this investigation was twofold: (1) to search for clinical articles pertaining to success and failure of periapical surgery and (2) to assign levels of evidence to these studies except case reports. Electronic and manual searches were conducted to identify all the literature regarding success and failur...
journal_title：Journal of endodontics
pub_type： 杂志文章,评审
doi：10.1097/01.don.0000133158.35394.8a
更新日期：2005-01-01 00:00:00
abstract：:The purpose of this investigation was to compare the antimicrobial effect of MTAD (a mixture of a tetracycline isomer, an acid, and a detergent) with that of NaOCl with and without EDTA. Eighty-five extracted human teeth were contaminated with Enterococcus faecalis for 4 weeks. After biomechanical instrumentation usin...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200309000-00008
更新日期：2003-09-01 00:00:00
abstract：INTRODUCTION:This study was to investigate the effects of tricalcium silicate (Ca(3)SiO(5)) on proliferation and odontogenic differentiation of human dental pulp cells (hDPCs) in vitro. METHODS:The hDPCs were seeded in culture medium with or without Ca(3)SiO(5) extract and calcium hydroxide (Ca(OH)(2)) extract. Prolif...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2011.05.035
更新日期：2011-09-01 00:00:00
