This in vitro study used computed tomography (CT) to compare the occurrence of canal transportation in the apical third of mesiobuccal canals in maxillary molars instrumented with 3 techniques. Sixty teeth were assigned to 3 groups (n = 20), and the root canals were instrumented as follows: Group 1, hand instrumentation with K-files; Group 2, K-files coupled to an oscillatory system powered by an electric engine; Group 3, ProTaper NiTi rotary system powered by an electric engine. To compare the canal transportation produced by the different techniques, preinstrumentation and postinstrumentation 3-dimensional CT images were obtained from root cross-sections of the region located 3 mm short of the apical foramen of each root canal. The CT scans were exported to Adobe Photoshop software, and the initial and final images were superimposed to detect the root canal wall differences between them. Canal transportation was measured by the distance between the prepared canal center and the anatomic canal center. The manual technique produced lesser canal transportation (0.10 mm) than the oscillatory and rotary techniques (0.37 and 0.22 mm, respectively); this difference was statistically significant (P=.021). All studied techniques produced canal transportation.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.joen.2007.03.019 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Comparative Analysis of Canal Centering and Transportation: Edgefile X7 vs HyFlex EDM in Moderately Curved Mesiobuccal Root Canals of Mandibular Molars.
Med Sci Monit
January 2025
Department of Restorative Dental Sciences, College of Dentistry, Jazan University, Jazan, Saudi Arabia.
BACKGROUND This cone beam computed tomography (CBCT) endodontics study aimed to compare the canal-centering ability and canal transportation of Edgefile X7 and HyFlex EDM files in moderately curved mesiobuccal (MB) root canals of 30 mandibular first permanent molar teeth. MATERIAL AND METHODS Thirty permanent mandibular first molars with 10° and 24° of mesial root curvature were selected and scanned with CBCT. Two experimental groups of 15 each were made: group I: HyFlex EDM, and group II: Edgefile X7.
View Article and Find Full Text PDFInnervation of the female internal genital organs in 12-week-old porcine foetuses.
Pol J Vet Sci
December 2024
Department of Human Physiology and Pathophysiology, School of Medicine, University of Warmia and Mazury in Olsztyn, Warszawska 30, 10-082 Olsztyn, Poland.
This is the first study aimed to investigate the innervation of the internal genital organs in 12-week-old female pig foetuses using single and double-labelling immunofluorescence methods. Immunostaining for protein gene product 9.5 (PGP, general neural marker) revealed that the most numerous PGP-positive nerve fibres were found in the mesenchyme of the uterovaginal canal height.
View Article and Find Full Text PDFMicrotomographic Analysis of the Biomechanical Performance of Thermally Treated Instruments in Flattened and Curved Root Canals.
J Endod
December 2024
Department of Restorative Dentistry, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil. Electronic address:
Objectives: This study aimed to evaluate, using micro-computed tomography (microCT), the impact of various mechanized systems on the geometry of the root canal system (RCS) and dentin thickness in mandibular first molars. The hypothesis proposed that different systems would produce significant variations in RCS preparation.
Methods: Mesial and distal canals of mandibular molars were selected and divided into five groups (n=10) based on the system used: 2Shape (25.
Continuous Chelation Reduces Instrumentation Time and Straightening of Double-curved Simulated Root Canals in Bovine Dentin.
J Endod
December 2024
Division of Endodontology, Department of Conservative and Preventive Dentistry, Center for Dental Medicine, University of Zurich, 8032 Zurich, Switzerland. Electronic address:
Introduction: Adding a compatible chelator to the sodium hypochlorite (NaOCl) solution applied during instrumentation may affect shaping efficacy and canal transportation. This was studied in simulated double-curved root canals.
Methods: High-precision computer numerical control milling was used to recreate standardized S-shaped canals from a resin training block in longitudinally sectioned bovine incisor roots.
Numerical study of the effects of minor structures and mean velocity fields in the cerebrospinal fluid flow.
Fluids Barriers CNS
December 2024
School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, 47907, IN, USA.
The importance of optimizing intrathecal drug delivery is highlighted by its potential to improve patient health outcomes. Findings from previous computational studies, based on an individual or a small group, may not be applicable to the wider population due to substantial geometric variability. Our study aims to circumvent this problem by evaluating an individual's cycle-averaged Lagrangian velocity field based on the geometry of their spinal subarachnoid space.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!