Abstract：
:The purpose of this study was to evaluate the integrity of resected root-end surfaces of extracted human teeth after using ultrasonic tips at low or high frequencies for root-end preparation. Thirty bilaterally matched pairs of single-rooted human teeth had root-end resections using a low-speed diamond saw and were examined for root-end cracks. The matched pairs of teeth were then divided into two experimental groups, with one member of each pair being placed in each group. In group 1, root-end preparations were made with an ultrasonic tip on the lowest frequency setting. The preparations in group 2 were done on the highest power setting. Two investigators again examined the resected root-ends using a stereomicroscope at x20 to x63 and recorded the numbers, types, and location of the cracks. Three types of cracks were observed: canal cracks, intradentin cracks, and cemental cracks. There were significantly more root-ends with cracks after ultrasonic root-end preparation than after root-end resection only. In root-ends that had any cracks, significantly more canal cracks per root occurred when the ultrasonic tip was used on the high-frequency setting for root-end preparation than when the ultrasonic tip was used on the low power setting.
journal_name
J Endodjournal_title
Journal of endodonticsauthors
Layton CA,Marshall JG,Morgan LA,Baumgartner JCdoi
10.1016/S0099-2399(96)80091-4subject
Has Abstractpub_date
1996-04-01 00:00:00pages
157-60issue
4eissn
0099-2399issn
1878-3554pii
S0099-2399(96)80091-4journal_volume
22pub_type
杂志文章abstract：INTRODUCTION:The purpose of this study was to verify the expression of the calcium-sensing receptor (CaSR) and its role in mineral trioxide aggregate (MTA)-induced odontoblastic differentiation and mineralization in human dental pulp cells (hDPCs). METHODS:The expression of CaSR in human dental pulp tissue and hDPCs w...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2019.03.019
更新日期：2019-07-01 00:00:00
abstract：:The purpose of this study was to evaluate the dental anxiety expressed among patients undergoing endodontic treatment with respect to some social and dental parameters. The dental records of 98 patients, 42 men and 56 women who were referred for root canal treatment to an endodontist, were examined. Patients completed...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/S0099-2399(98)80028-9
更新日期：1998-06-01 00:00:00
abstract：INTRODUCTION:The aim of this study was to compare the transportation and centering abilities of the ProGlider (PG; Dentsply-Sirona, Ballaigues, Switzerland), WaveOne Gold Glider (WOGG; Dentsply-Sirona), and R-Pilot (RP; VDW, Munich, Germany) file systems and the changes in the structure model index (SMI), surface area,...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2019.02.012
更新日期：2019-06-01 00:00:00
abstract：INTRODUCTION:Enterococcus faecalis is a frequently isolated microorganism in persistent periapical lesion or secondary infection. However, no evidence has demonstrated that E. faecalis induced inflammation directly in the apical area. This study aimed to explore the mechanism of the inflammatory responses of human peri...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2015.08.028
更新日期：2015-12-01 00:00:00
abstract：:To date there has been very little data on the cytotoxic response of different cell lines to root canal sealers. The objective of this study was to determine the cytocompatibility of three different extracts of root canal sealers and to compare the cytotoxic response of these materials on two different primary human o...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200109000-00004
更新日期：2001-09-01 00:00:00
abstract：:Biofilm mode of growth is a strategy in microorganisms to survive harsh growth conditions. Although previous studies have established the ability of Enterococcus faecalis to survive postendodontic environmental conditions, the effect of such conditions on the ultrastructural and physiochemical features of E. faecalis ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/01.don.0000164855.98346.fc
更新日期：2005-12-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to evaluate the incidence and mode of WaveOne (Dentsply Tulsa Dental Specialties, Tulsa, OK) instrument defects after single use at different endodontic clinics. METHODS:A total of 438 WaveOne instruments were collected after clinical use from the 4 specialist clinics over a ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2015.10.008
更新日期：2016-02-01 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:The aim of this prospective, randomized, double-blind clinical trial was to evaluate the effect of a preoperative, single, oral dose of diclofenac potassium (DFK) on postoperative pain and rescue analgesic intake in patients with symptomatic irreversible pulpitis in mandibular molars treated in 1 visit. M...
journal_title：Journal of endodontics
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.joen.2020.05.008
更新日期：2020-08-01 00:00:00
abstract：:In this retrospective study with limited cone-beam computed tomography (limited CBCT), we investigated the anatomic characteristics of the accessory mental foramina and accessory branches of the mandibular canal. The CBCT records of approximately 150 patients were evaluated, and 17 accessory mental foramina were found...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2008.08.033
更新日期：2008-12-01 00:00:00
abstract：INTRODUCTION:The mental foramen (MF) is an important landmark in dentistry. Knowledge of its position is central to perform block anesthesia of the mental nerve or to avoid nerve damage during surgical procedures in the premolar area of the mandible. The present radiographic study aimed at evaluating the location and d...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2013.07.033
更新日期：2013-12-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to compare digital periapical and cone-beam computed tomography (CBCT) images to determine the number of canals in the mesiobuccal root of maxillary molars and to compare these counts with micro computed tomography (μCT), which was also used to determine canal configuration. ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2013.01.010
更新日期：2013-07-01 00:00:00
abstract：INTRODUCTION:The purpose of this prospective, randomized, single-blinded study was to measure the degree of anesthesia obtained with 1.8 mL and 3.6 mL of 2% lidocaine with 1:100,000 epinephrine in posterior superior alveolar (PSA) nerve blocks. METHODS:Thirty-one adult subjects randomly received PSA nerve blocks of 1....
journal_title：Journal of endodontics
pub_type： 杂志文章,随机对照试验
doi：10.1016/j.joen.2010.01.009
更新日期：2010-04-01 00:00:00
abstract：:The purpose of this in vitro study was to compare the extrusion of thermoplacticized gutta-percha in teeth instrumented with Profile 0.06 or Profile GT, and obturated with Thermafil Plus and Thermafil GT, respectively. A total of 120, extracted, human maxillary central incisors were divided into four equal groups. Gro...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200406000-00010
更新日期：2004-06-01 00:00:00
abstract：INTRODUCTION:The aim of this study was to assess temperature changes in conventional gutta-percha, thermoplastic gutta-percha, and Resilon cones by using thermomechanical compaction technique. METHODS:The root canals of extracted human teeth were placed in resin blocks and sectioned. After root canal preparation, cavi...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2009.03.009
更新日期：2009-06-01 00:00:00
abstract：:The aim of this study was to describe a guided endodontic technique that facilitates access to root canals of molars presenting with pulp calcifications. A 61-year-old woman presented to our service with pain in the upper left molar region. The second and third left molars showed signs of apical periodontitis confirme...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2018.02.009
更新日期：2018-05-01 00:00:00
abstract：INTRODUCTION:The aim of this study was to compare the amount of debris extruded from the apex during retreatment procedures with ProTaper Next (PTN; Dentsply Maillefer, Ballaigues, Switzerland), Reciproc (RCP; VDW, Munich, Germany), and Twisted File Adaptive (TFA; SybronEndo, Orange, CA) files and the duration of these...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2016.12.003
更新日期：2017-04-01 00:00:00
abstract：:Understanding the chemical and physical characteristics of set mineral trioxide aggregate (MTA) surface can provide insight into its bioactivity. The purpose of this study was to describe the surface chemistry and morphology of gray and white MTA set in the presence of fetal bovine serum (FBS). Eight MTA blocks were p...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2007.09.013
更新日期：2008-01-01 00:00:00
abstract：INTRODUCTION:The purpose of this study was to assess the ex vivo torsional performance of a novel rotary system in small root canals after 2 different glide path preparations. METHODS:Each independent canal of 8 mesial roots of mandibular molars was randomly assigned to achieve a reproducible glide path with a new set...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2016.10.034
更新日期：2017-03-01 00:00:00
abstract：:The effects of various cleaning, chemical disinfection, and sterilization procedures on the cutting efficiency of endodontic instruments Unifile (De Trey, Bois Colombes, France), (Flexofile Maillefer, Ballaigues, Switzerland), and H-File (Maillefer)) were investigated. The cross-infection control treatment procedures ...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/S0099-2399(96)80059-8
更新日期：1996-12-01 00:00:00
abstract：:Gutta-percha (GP) has been the most widely used root canal filling material because of its well-known low toxicity. The inertness of GP, however, was challenged recently. The purpose of this study was to evaluate the toxicity of marketed endodontic GP using the radiochromium release test. Fourteen commercially availab...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/s0099-2399(06)81885-6
更新日期：1990-09-01 00:00:00
abstract：:The oral region comprises 1% of the total body area, yet it accounts for 5% of all bodily injuries. In preschool children, oral injuries make up as much as 17% of all bodily injuries. The incidence of traumatic dental injuries is 1%-3%, and the prevalence is steady at 20%-30%. The annual cost of treatment is US $2-$5 ...
journal_title：Journal of endodontics
pub_type： 杂志文章,评审
doi：10.1016/j.joen.2012.11.021
更新日期：2013-03-01 00:00:00
abstract：INTRODUCTION:Apical extrusion of irrigants and debris is an inherent limitation associated with cleaning and shaping of root canals and has been studied extensively because of its clinical relevance as a cause of flare-ups. Many factors affect the amount of extruded intracanal materials. The purpose of this study was t...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2015.09.002
更新日期：2015-12-01 00:00:00
abstract：:A palatogingival groove is an anatomic malformation that predisposes the involved tooth to a severe periodontal defect. When the condition is complicated by pulpal necrosis, affected teeth often present a dilemma in terms of diagnosis and treatment planning. In this report, we describe the case of a patient with a max...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2015.10.009
更新日期：2016-02-01 00:00:00
abstract：INTRODUCTION:Vertical root fractures (VRFs) are among the most frequent causes of tooth loss, mainly of endodontically treated teeth. However, very few data is available about the occurrence of VRFs following apical surgery. METHODS:Patient charts from 864 patients with 1058 teeth treated with apical surgery (Septembe...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2020.10.012
更新日期：2021-02-01 00:00:00
abstract：INTRODUCTION:Many anatomical variations can occur within the mandibular first molar. Commonly, 3-4 canals are located, but as many as 6-7 canals have been reported. METHODS:This report describes a case of a mandibular first molar with 6 separate canals (3 mesial and 3 distal) that was instrumented with conventional ha...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2011.03.005
更新日期：2011-06-01 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：:Previous studies have indicated that vertical root fracture tends to occur in a buccolingual direction, where dentin thickness is greatest. Factors potentially influencing the location and direction of root fracture include root canal shape, external root morphology, and dentin thickness. In this finite-element study,...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1097/00004770-200308000-00008
更新日期：2003-08-01 00:00:00
abstract：:In this study, we examined the effects of TNF-alpha on Bone morphogenetic protein (BMP-2), Smads (which play intracellular signaling of BMPs) expression and alkaline phosphatase (ALP) activity of human dental pulp (HDP) cells to clarify the mechanism of tertiary dentin formation. The quantity of RT-PCR product for BMP...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2005.12.007
更新日期：2006-06-01 00:00:00
abstract：INTRODUCTION:This study compared the efficacy of a reciprocating single-instrument system and a rotary multi-instrument system followed by a supplementary approach with a finishing instrument in removing the filling material from curved canals during retreatment. METHODS:Forty mesial canals from extracted mandibular m...
journal_title：Journal of endodontics
pub_type： 杂志文章
doi：10.1016/j.joen.2016.04.007
更新日期：2016-07-01 00:00:00
