The impact of minimally invasive root canal preparation strategies on the ability to shape root canals of mandibular molars

2020 ◽  
Vol 53 (12) ◽  
pp. 1680-1688
Author(s):  
C. O. Lima ◽  
A. F. A. Barbosa ◽  
C. M. Ferreira ◽  
C. M. Augusto ◽  
L. M. Sassone ◽  
...  
Keyword(s):  
Minimally Invasive ◽  
Root Canal ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Mandibular Molars ◽  
The Impact

scholarly journals Root canal curvature as a prognostic factor influencing the diagnostic accuracy of radiographic working length determination and postoperative canal axis modification: an in vitro comparative study

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Bestoon Mohammed Faraj
Keyword(s):  
Root Canal ◽  
Radiographic Images ◽  
The Real ◽  
Root Canals ◽  
Length Estimation ◽  
Working Length ◽  
Length Determination ◽  
Case Difficulty Assessment ◽  
The Impact

Abstract Background Radiographic analysis of tooth morphology is mandatory for accurate calibration of the degree of canal curvature angle and radiographic working length to its real dimensions in case difficulty assessment protocols. This study aimed to determine the impact of the degree of root canal curvature angle on maintaining the real working length and the original canal axis of prepared root canals using a reciprocating rotary instrumentation technique. Methods Radiographic image analysis was performed on 60 extracted single-rooted human premolar teeth with a moderate canal curvature (10°–25°) and severe canal curvature (26°–70°). Working length and longitudinal canal axis were determined using cone-beam computed tomography (CBCT) and digital periapical radiography. The real canal length was determined by subtracting 0.5 mm from the actual canal length. Root canals were prepared using the WaveOne Gold reciprocating file (Dentsply Maillefer, Ballaigues, Switzerland). Results There was no significant relation of the degree of canal curvature angle to the accuracy of radiographic working length estimated on CBCT and digital periapical radiographic techniques (P > 0.05). Postinstrumentation changes in the original canal axis between moderate and severe canal curvature angles, assessed on CBCT and periapical digital radiographic images were statistically non-significant (P > 0.05). Conclusions A standardized digital periapical radiographic method performed similarly to the CBCT technique near to its true working length. No significant interaction exists between the diagnostic working length estimation, postoperative root canal axis modification, and the degree of canal curvature angle, using reciprocating rotary instrumentation technique.

Force and vibration analysis in biomechanical preparation of root canals using reciprocating endodontic file system: In vitro study

2021 ◽  
pp. 095441192110442
Author(s):  
Vinod Singh Thakur ◽  
Pavan Kumar Kankar ◽  
Anand Parey ◽  
Arpit Jain ◽  
Prashant Kumar Jain
Keyword(s):  
Root Canal ◽  
Vibration Analysis ◽  
File System ◽  
In Vitro Study ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Improper Use ◽  
Four Levels ◽  
Root Canal Instrumentation

The shaping and cleaning of the root canal are very important in root canal treatment. The excessive force and vibration during biomechanical preparation of the root canal may result in failure of the endodontic file. In this study, force and vibration analysis was carried out during root canal preparation. The samples of human extracted (premolar) teeth were provided by the College of Dental Science and Hospital. Endodontic instruments for reciprocating motion, such as the WaveOne Gold file system, had been used for root canal preparation. Force and vibration signals were recorded by dynamometer and accelerometer, respectively. The acquired signals were denoised using the db4 (SWT denoising 1-D) wavelet. Four levels of decomposition were carried out for each signal. The signal denoising technique was used to remove unwanted noise from the acquired signal. FESEM analysis was used to visualize the levels of severity of endodontic files during the cleaning and shaping of the root canal. In most of the cases, the failure occurred due to the improper use of the root canal instrumentation. The optimum amount of force was used to avoid the file failure and provided the proper instrumentation. The curve fitting regression model was used to find the interdependency between force and vibration.

scholarly journals Effects of Contemporary Irrigant Activation Schemes and Subsequent Placement of an Interim Dressing on Bacterial Presence and Activity in Root Canals Associated with Asymptomatic Apical Periodontitis

2020 ◽  
Vol 9 (3) ◽  
pp. 854 ◽  
Author(s):  
Alexandre P. L. Carvalho ◽  
Laura C. L. Nardello ◽  
Fernanda S. Fernandes ◽  
Fernanda P. Bruno ◽  
Luiza R. Paz ◽  
...  
Keyword(s):  
Calcium Hydroxide ◽  
Root Canal ◽  
Quantitative Polymerase Chain Reaction ◽  
Apical Periodontitis ◽  
Universal Primers ◽  
Rrna Gene ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Mechanical Preparation ◽  
Root Canal Disinfection

New tools for activating endodontic irrigants have evolved, yet their impact on root canal disinfection, in comparison to the passive placing of an inter-visit medication, have not yet been fully elucidated. The use of DNA- and rRNA-based methods may cast some new light on this issue, as they allow a comparison to be made between microbial presence and activity. Therefore, the aim of this single-arm intervention trial is to evaluate the antibacterial effect of endodontic procedures using both molecular methods. Root canal samples were obtained from 20 patients with asymptomatic apical periodontitis after each treatment step: access cavity, chemo-mechanical preparation, adjunctive procedures (XP-endo Finisher file and passive ultrasonic irrigation), calcium hydroxide medication, and 2nd-visit root canal preparation. DNA and cDNA from the samples were subjected to quantitative polymerase chain reaction with universal primers for the bacterial 16S rRNA gene. Chemo-mechanical preparation promoted a drastic reduction in bacterial levels and activity, whereas the adjunctive procedures did not make a significant contribution to further disinfection. At the 2nd visit, bacteria were active after the use of calcium hydroxide medication; however, they were significantly reduced after a 2nd-visit preparation. Consequently, the lowest bacterial levels were found at the end of the treatment. This clinical trial, which used an rRNA and rDNA combined approach, confirmed previous studies showing that root canal preparation represents the main strategy for root canal disinfection.

scholarly journals Evaluation Algorithm of Root Canal Shape Based on Steklov Spectrum Analysis

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Dongqing Wu ◽  
Jian Gao ◽  
Xiaoli Hu ◽  
Zhengtao Xiao ◽  
Zhuwei Huang ◽  
...  
Keyword(s):  
Root Canal ◽  
Evaluation Method ◽  
Complete Removal ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Need To Evaluate ◽  
Before And After ◽  
Evaluation Algorithm ◽  
Steklov Spectrum ◽  
Volume Difference

In recent years, we have seen more and more interest in the field of medical images and shape comparison motivated by the latest advances in microcomputed tomography (μCT) acquisition, modelling, and visualization technologies. Usually, biologists need to evaluate the effect of different root canal preparation systems. Current root canal preparation evaluation methods are based on the volume difference, area difference, and transportation of two root canals before and after treatment. The purpose of root canal preparation is to minimize the volume difference and ensure the complete removal of the smear layer. Previous methods can reflect some general geometric differences, but they are not enough to evaluate the quality of root canal shape. To solve this problem, we proposed a novel root canal evaluation method based on spectrum and eigenfunctions of Steklov operators, which can be served as a better alternative to current methods in root canal preparation evaluation. Firstly, the ideal root canal model was simulated according to the root canal model before and after preparation. Secondly, the Steklov spectrum of the two models was calculated. Thirdly, based on the spectrum and the histogram of the Gaussian curvature on the surface, the weight of each eigenvalue was computed. Therefore, the Steklov spectrum distance (SSD), which measures shape difference between the root canals, was defined. Finally, the calculation method that quantifies the root canal preparation effect of root canals was obtained. Through experiments, our method manifested high robustness and accuracy compared with existing state-of-the-art approaches. It also demonstrates the significance of our algorithm’s advantages on a variety of challenging root canals through result comparison with counterpart methods.

scholarly journals Effect of a Surfactant on the Antimicrobial Activity of Sodium Hypochlorite Solutions

2014 ◽  
Vol 25 (5) ◽  
pp. 416-419 ◽  
Author(s):  
Marcos Rodolfo Bolfoni ◽  
Marcelo dos Santos Ferla ◽  
Otávio da Silva Sposito ◽  
Luciano Giardino ◽  
Rogério de Castilho Jacinto ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Sodium Hypochlorite ◽  
Root Canal ◽  
Root Canal Preparation ◽  
Human Teeth ◽  
Significance Level ◽  
Root Canals ◽  
Tukey Test ◽  
Irrigation Solution ◽  
Period Data

The objective of the present study was to evaluate the antimicrobial activity of sodium hypochlorite (NaOCl) associated with a surfactant. Seventy single-rooted extracted human teeth were inoculated with Enterococcus faecalis, and incubated for 21 days (37 °C). The groups were distributed according to the irrigation solution used during root canal preparation: 5%, 2.5% and 1% NaOCl; 5%, 2.5% and 1% Hypoclean(r), a solution containing a surfactant (cetrimide) associated with NaOCl. Three microbiological samples were collected from each tooth: S1 - before instrumentation; S2 - immediately after instrumentation; and S3 - after a seven-day period. Data were submitted to ANOVA and Tukey test with 5% significance level. The results showed that immediately after root canal preparation (S2), E. faecalis was eliminated in all the experimental groups. However, after 7 days (S3), only the groups in which Hypoclean was used, remained contamination-free, including Hypoclean associated with 1% NaOCl, while the root canals irrigated with 1% NaOCl only, presented the highest percentage of bacterial growth. In conclusion, the addition of surfactant increased the antimicrobial activity of 1% NaOCl to levels similar to 5% NaOCl.

scholarly journals In vitro evaluation of root canal preparation using oscillatory and rotary systems in flattened root canals

2007 ◽  
Vol 15 (1) ◽  
pp. 65-69 ◽  
Author(s):  
Luis Cardoso Rasquin ◽  
Fabíola Bastos de Carvalho ◽  
Regina Karla de Pontes Lima
Keyword(s):  
Root Canal ◽  
Root Canal Preparation ◽  
In Vitro Evaluation ◽  
Root Canals

scholarly journals Effect of glide path on transportation promoted by NiTi and M-Wire instruments

2018 ◽  
Vol 21 (1) ◽  
pp. 104
Author(s):  
Tatiane Pires Nogueira ◽  
Ellen Roberta Lima Bessa ◽  
Eduardo Da Costa Nunes ◽  
André Augusto Franco Marques ◽  
Lucas Da Fonseca Roberti Garcia ◽  
...  
Keyword(s):  
Statistical Analysis ◽  
Root Canal ◽  
Polyester Resin ◽  
Root Canal Preparation ◽  
Root Canals ◽  
Path Creation ◽  
Dental Instruments ◽  
Glide Path ◽  
Significant Difference ◽  
Before And After

<p><strong>Objective:</strong> To evaluate the effect of glide path creation on transportation promoted by NiTi and M-Wire instruments. <strong>Material and Methods: </strong>Sixty polyester resin blocks containing a simulated root canal were distributed into four groups (n=15), according to the protocols/systems used for root canal preparation: GPR group - glide path + Revo-S system; R group - no glide path + Revo-S system; GPPN group - glide path + ProTaper Next system and PN group - no glide path + ProTaper Next system. Root canals were photographed before and after preparation, and the images were superimposed to evaluate the transportation at the apical, middle and coronal thirds. The time spent to perform preparation was also measured (seconds). Data were submitted to the non-parametric Kruskal-Wallis test (p&lt;0.05) for statistical analysis. <strong>Results:</strong> In the apical third, there was no significant difference among groups (p&gt;0.05). GPR and R groups were similar in the middle third (p&gt;0.05). However, the transportation value in GPR group was statistically higher in comparison with GPPN and PN groups (p&lt;0.05). In the coronal third, GPR and R groups were similar (p&gt;0.05). Only R group presented significant difference in comparison with GPPN and PN groups (p&lt;0.05). There was no difference among groups about time spent to perform preparation (p&gt;0.05). <strong>Conclusion:</strong> None of the systems were capable of maintaining the original trajectory of the simulated root canal, and the glide path had no effect on the transportation promoted by instruments.</p><p><strong>Keywords</strong></p><p>Dental instruments; Endodontics; Root canal preparation.</p>

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