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 mesial canals standardized (250 μm) and their respective initial RCL was recorded (RCL1 = initial) by using a clinical microscope (×16) and manual K-file instruments. By using the alginate model, sequential electronic measurements were taken with the RZX. After the initial measurement (EM1), WaveOne Primary instruments were used to prepare the cervical and middle thirds of the root canals, and then the second RCL and EM measurements (RCL2/EM2 = preflared) were obtained. Finally, mechanical preparation was concluded, and the measurement procedures were repeated to obtain the final RCL and EM measurements (RCL3/EM3 = concluded). RESULTS:Statistically significant differences were observed in all comparisons in the RCL (P < .05). The RCL1 - RCL3 showed the highest variation (0.6 mm), with the extent of specimens reduced by up to 1.75 mm. No statistically significant differences were found in the accuracy of the RZX (P > .05); 100% precision (± 0.5 mm) was found in all stages. CONCLUSIONS:Under the conditions of this study, the authors concluded that during endodontic treatment, the extent of the RCL was reduced, thereby jeopardizing control of the apical limit during instrumentation and/or obturation. The RZX was extremely accurate in all evaluated stages.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Vasconcelos BC,Bastos LM,Oliveira AS,Bernardes RA,Duarte MA,Vivacqua-Gomes N,Vivan RRdoi
10.1016/j.joen.2016.07.022subject
Has Abstractpub_date
2016-11-01 00:00:00pages
1683-1686issue
11eissn
0099-2399issn
1878-3554pii
S0099-2399(16)30481-2journal_volume
42pub_type
杂志文章abstract：INTRODUCTION:The purpose of this study was to evaluate the effect of low-surface tension EDTA solutions on the push-out bond strength of resin-based sealer to young and old root canal dentin. METHODS:Root canals from 64 (n = 32 age <30 years old and n = 32 >60 years old) extracted, decoronized, single-rooted human tee...
journal_title：Journal of endodontics
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更新日期：2011-11-01 00:00:00
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journal_title：Journal of endodontics
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abstract：:There is an increasing interest in the utility of dental pulp stem cells (DPSCs) for dentin regeneration. The mechanisms involved in DPSC differentiation remain poorly understood. The purpose of the study was to investigate the mineralization capacity of human dental pulp cells (DPCs) and identify potential markers fo...
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更新日期：2007-06-01 00:00:00
abstract：INTRODUCTION:This study evaluated 4 different light-emitting diode (LED) transilluminators and the impact of operator experience in the detection of dentinal defects through an ex vivo TRUEJAW surgical model (Dental Engineering Laboratories, Santa Barbara, CA). METHODS:Forty-four extracted and endodontically treated m...
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pub_type： 临床试验,杂志文章,随机对照试验
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journal_title：Journal of endodontics
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更新日期：1990-11-01 00:00:00
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doi：10.1097/00004770-200305000-00009
更新日期：2003-05-01 00:00:00
abstract：INTRODUCTION:A major complication after endodontic treatment is persistent pain on biting or chewing. Although unsuccessful endodontic treatment can account for such pain, pain to chewing and biting can also be a result of an unsupported or propagated crown fracture. Crown fractures that extend apically result in deter...
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pub_type： 杂志文章
doi：10.1016/j.joen.2014.06.021
更新日期：2015-01-01 00:00:00
abstract：:Locating the number and position of orifices on pulp-chamber floors can be difficult. This is especially true when the tooth being treated is heavily restored, malposed, or calcified. After evaluating 500 pulp chambers of extracted teeth, new laws for finding pulp chambers and root-canal orifices are proposed. The use...
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doi：10.1097/00004770-200401000-00002
更新日期：2004-01-01 00:00:00
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pub_type： 杂志文章,meta分析
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更新日期：2020-10-01 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
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更新日期：1995-03-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to evaluate the antimicrobial effects of root canal sealers on Enterococcus faecalis biofilms in dentinal tubules by using a novel dentin infection model. METHODS:Cells of E. faecalis were introduced into the dentinal tubules by centrifugation and incubated in brain-heart inf...
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doi：10.1016/j.joen.2013.10.042
更新日期：2014-04-01 00:00:00
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更新日期：2002-04-01 00:00:00
abstract：:A new endodontic obturation and retrofilling material has been invented to satisfy Grossman's requirements for an ideal material. Methylene blue dye leakage studies were carried out to compare the new material with conventional products, for both obturation and retrofilling. The experimental material when used in root...
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abstract：:The purpose of this study was to investigate histologically and histometrically the changes in pulpal and periapical tissues after pulpal exposure in rats. All animals received a pulpal exposure in the left mandibular first molar. Animals were killed at 1 to 56 days after pulpal exposure, and their mandibles were eval...
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pub_type： 杂志文章
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pub_type： 杂志文章
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更新日期：2017-06-01 00:00:00
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pub_type： 杂志文章
doi：10.1016/j.joen.2010.04.028
更新日期：2010-08-01 00:00:00
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更新日期：2010-01-01 00:00:00
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更新日期：2006-05-01 00:00:00
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pub_type： 杂志文章
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更新日期：2000-12-01 00:00:00
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journal_title：Journal of endodontics
pub_type： 杂志文章,随机对照试验
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更新日期：2011-10-01 00:00:00
abstract：:No information could be found in the dental literature on the hardness or strength of the materials in root canal instruments. Hardness testing is a convenient method for examining these products, and strength properties can be deduced from available strength-hardness data. The Vickers hardness of cross-sections of st...
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pub_type： 杂志文章
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更新日期：1996-02-01 00:00:00
