scholarly journals Working Length Transfer in the Endodontic Clinical Practice: A Comparative Study

2020 ◽  
Vol 10 (17) ◽  
pp. 5824
Author(s):  
Mario Alovisi ◽  
Mario Dioguardi ◽  
Massimo Carossa ◽  
Giuseppe Troiano ◽  
Maria Chiara Domini ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Comparative Study ◽  
Traditional Method ◽  
Nickel Titanium ◽  
Permanent Teeth ◽  
Root Canals ◽  
Working Length ◽  
Two Measures ◽  
The Difference ◽  
Transfer Method

The present paper evaluated the accuracy of two different methods for transferring working length (WL) between manual endodontic instruments and nickel–titanium (NiTi) shaping files. Thirty root canals of extracted permanent teeth were used. Root canals were divided according to canal length (CL) and canal curvature (CC). The reference cusp and the root end were flattened to provide reproducible and accurate measurements. During shaping, the WL measurements were obtained with manual k-files (KF) and transferred to WaveOne (W1) NiTi reciprocating files using the traditional method with the endodontic ruler (method I) and an alternative clinical procedure based on the comparison of the instruments side by side from tip to shank (method II). For each file and each tested method, two measures were taken by two examiners using Rhino (ver. 4.0, McNeel, Seattle, WA, USA) software for a total of 360 (30 × 3 × 2 × 2) measures. Analysis of variance was performed by taking the difference in length (Delta WL, DWL) between files used for the same canal. The difference between methods I and II for WL transfer was found to be statistically significant (df = 1; F = 71.52; p < 0.001). The DWL absolute values obtained with method II were found to be closer to 0 mm (i.e., same length as corresponding KF) than those obtained with method I. Both CL (df = 2; F = 1.27; p = 0.300) and CC (df = 1; F = 2.22; p = 0.149) did not significantly influence WL measurements. With respect to WL transfer, method II seemed to better preserve the correct WL transfer between instruments during the clinical endodontic procedures.

scholarly journals Root canals shaped by nickel-titanium instrumentation with automated computerized numerical control systems

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Liming Wang ◽  
Wenxiang Li ◽  
Yeon-Jee Yoo ◽  
Shin Hye Chung ◽  
Soram Oh ◽  
...  
Keyword(s):  
Root Canal ◽  
Nickel Titanium ◽  
Numerical Control ◽  
Central Axis ◽  
Downward Movement ◽  
Preparation Time ◽  
Root Canals ◽  
Insertion Angle ◽  
Group 4 ◽  
Working Length

Abstract Background To investigate the efficacy of a nickel-titanium (NiTi) file with an automated computerized numerical control (CNC) system for root canal shaping. Methods The movement of the automated device and the insertion angle were investigated. In Experiment 1, simulated resin root canals were randomly divided into four groups (n = 20): manual downward movement using a handpiece (Group 1), vertical downward movement by CNC (Group 2), reciprocating up and down movement by CNC (Group 3), and spiral up and down movement by CNC (Group 4). In Experiment 2, five different insertion angles of the NiTi file were evaluated (n = 20). Four parameters were used to evaluate the shaping ability: change in the working length, central axis offset, curvature variation, and preparation time. Groups were compared using one-way analysis of variance (ANOVA) with significance was set at P < 0.05. Results The change in central axis position in the curved part of the root canal was found to be smaller in Group 4 than in other groups (P < 0.05). The curvature changes and preparation time of Groups 1 and 4 were significantly reduced compared with Groups 2 and 3 (P < 0.05). The variation in working length and curvature in the 5° insertion angle group was significantly smaller than in the other groups (P < 0.05). Conclusions A spiral up and down movement, controlled by the CNC machine, and 5° insertion angle, maintained original root canal shape more precisely than other methods.

scholarly journals Detection of Enterococcus faecalis in Necrotic Teeth Root Canals by Culture and Polymerase Chain Reaction Methods

2007 ◽  
Vol 01 (04) ◽  
pp. 216-221 ◽  
Author(s):  
Dilsah COGULU ◽  
Atac UZEL ◽  
Ozant ONCAG ◽  
Semiha d AKSOY ◽  
Cemal ERONAT
Keyword(s):  
Polymerase Chain Reaction ◽  
Enterococcus Faecalis ◽  
Permanent Teeth ◽  
Deciduous Teeth ◽  
Chain Reaction ◽  
Test Species ◽  
Root Canals ◽  
Significant Difference ◽  
Polymerase Chain ◽  
The Difference

ABSTRACTObjectives: The aim of this study was to investigate the presence of Enterococcus faecalis in endodontic infections in both deciduous and permanent teeth by culture and polymerase chain reaction (PCR) methods.Methods: A total of 145 children aged 5-13 years old were involved in this study. The presence of E. faecalis in necrotic deciduous and permanent teeth root canals was studied using culture and polymerase chain reaction methods.Results: Among 145 molar teeth, 57% (n=83) presented necrotic asymptomatic pulp tissues and were included in this study. Culture and PCR methods detected the test species in 18 and 22 of 83 teeth involved, respectively. E. faecalis was cultured from 8 (18%) of 45 necrotic deciduous teeth and from 10 (26%) of 38 necrotic permanent teeth. PCR detection identified the target species in 10 (22%) and 12 (32%) of necrotic deciduous and permanent teeth respectively. Statistically significant difference in the presence of E. faecalis in deciduous and permanent teeth was found by culture and PCR methods (P=0.03 and 0.02, respectively). The difference in the presence of E. faecalis between two different methods was not statistically significant (P>.05).Conclusions: The results of the present study confirm that both culture and PCR methods are sensitive to detect E. faecalis in root canals. (Eur J Dent 2007;1:216-221)

scholarly journals Change of working length in curved molar root canals after preparation with different rotary nickel-titanium instruments

2011 ◽  
Vol 14 (3) ◽  
pp. 264 ◽  
Author(s):  
Pardeep Khurana ◽  
KiranmeetKaur Sodhi ◽  
MohanThomas Nainan ◽  
BupinderKaur Padda
Keyword(s):  
Nickel Titanium ◽  
Root Canals ◽  
Working Length

scholarly journals Evaluation of Apical Transportation by Three Rotary Systems in Extracted Teeth with Curved Canals

2018 ◽  
pp. 85-94
Author(s):  
Ana Laura Ortiz-Rocha DDS, MS ◽  
Claudia Dávila-Pérez DDS, PhD ◽  
Marlen Vitales-Noyola MS, PhD ◽  
Verónica Méndez-González DDS, MS ◽  
Ana María González-Amaro MS ◽  
...  
Keyword(s):  
In Vitro Study ◽  
Nickel Titanium ◽  
Preparation Technique ◽  
X Ray ◽  
Root Canals ◽  
Working Length ◽  
Apical Transportation ◽  
Post Hoc

The aim of this study was to compare the apical transportation in extracted teeth using three different rotary nickel-titanium systems (Mtwo, Hyflex CM, and Typhoon). Sixty extracted first molars were randomly divided into three groups (n=20 in each group) with similar root canal curvatures (25-52 degrees). All root canals were prepared to size 30 using a crown-down preparation technique for each rotary system. Loss of working length and apical transportation were determined by X-ray evaluation. Comparisons between the groups were performed using one-way analysis of variance (ANOVA) or Kruskal-Wallis tests, and the post hoc analyses employed were Dunn´s or Tukey´s multiple comparison tests. No significant differences were detected between the different rotary systems in the loss of working length and apical transportation. This in vitro study showed that the use of these three rotary systems are safe and useful for instrumentation in curved canals; however, further in vivo research is essential to compare the effectiveness and safety of these systems for use in curved canals.

scholarly journals Impact of Endodontic Instrumentation on Surface Roughness of Various Nickel-Titanium Rotary Files

2020 ◽  
Author(s):  
Muhammad Sohail Zafar
Keyword(s):  
Surface Roughness ◽  
Three Dimensional ◽  
Nickel Titanium ◽  
Root Mean Square Roughness ◽  
Contact Mode ◽  
Root Canals ◽  
Working Length ◽  
Mandibular Molar ◽  
Significant Difference ◽  
Before And After

Abstract Objectives The aim of the present study was to evaluate the surface roughness (SR) of various nickel-titanium (NiTi) rotary endodontic instruments (ProTaper Next [PTN], WaveOne Gold [WOG], and ProTaper Gold [PTG]) before and after root canal instrumentation. Materials and Methods For each type (PTN, WOG, and PTG), the endodontic instrumentation was performed using extracted mandibular molar teeth’s curved mesial root canals (curvature: 20–40 degrees) after determining the working length. Each NiTi file was cleaned, and sterilized following preparation of four root canals and characterized for surface properties before and after endodontic instrumentation using a contact-mode three-dimensional surface profiler. The data were analyzed statistically using Statistical Package for the Social Sciences for SR parameters including average surface roughness value (Sa), root mean square roughness (Sq), and peak to valley height (Sz). Results Preinstrumentation assessment revealed a significant difference for all the three SR variables (p < 0.05) for the cutting blade and the flute area. WOG instruments showed the highest SR values (p = 0.000). The postinstrumentation assessment revealed significant differences in SR values in the blade and the flute between the three groups (p < 0.05), with WOG and PTG exhibiting the highest values in the blade and flute sections, respectively. Conclusions The SR parameters of intact PTN, WOG, and PTG NiTi files vary and that was increased following the endodontic instrumentation.

scholarly journals Shaping Ability, Cyclic Fatigue Resistance and Fractographic Analysis of Hybrid and Reciprocating Nickel Titanium Endodontic Instruments

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 172 ◽  
Author(s):  
Saulius Drukteinis ◽  
Vytaute Peciuliene ◽  
Ruta Bendinskaite ◽  
Vilma Brukiene ◽  
Rasmute Maneliene ◽  
...  
Keyword(s):  
Fatigue Resistance ◽  
Root Canal ◽  
Cyclic Fatigue ◽  
Nickel Titanium ◽  
Significance Level ◽  
Root Canals ◽  
Working Length ◽  
Before And After ◽  
Canal Transportation ◽  
Shaping Ability

The aim of this study was to investigate the shaping ability and cyclic fatigue resistance of Genius (GN) and WaveOne (WO) nickel-titanium (NiTi) instruments. Forty mesial root canals of mandibular molars were randomly divided into two groups, according to the instrument system used for root canal preparation (n = 20): GN and WO. Root canals were prepared to the full working length using the crown-down technique, with up to 40.04 instruments for GN group and 40.08 instruments for WO group. Specimens were scanned with a µCT before and after instrumentation. The changes in 3D parameters and degree of canal transportation were evaluated in the apical, middle and coronal thirds of root canals. Size 25, taper 0.04 (GN) and 0.08 (WO) instruments (n = 20) were used in simulated root canals until fracturing, and the number of cycles to failure (NCF) was recorded. The fractured files were investigated under a scanning electron microscope to characterize fractured surfaces. Data were analyzed using ANOVA post hoc Tuckey’s tests with the significance level set at 5%. The GN system was able to prepare the higher percentage of the canal surface with less canal transportation in all root canal thirds and displayed the higher resistance to cyclic fatigue in comparison to WO instruments (p < 0.05). However, the length of the fractured segments was not significantly different among the groups; meanwhile, SEM investigations revealed the typical topographic characteristics of fractured surfaces. Hybrid GN instruments demonstrated superior shaping ability and resistance to cyclic fatigue. However, both NiTi instrument systems prepared the root canals with no significant shaping errors, considerable changes in 3D parameters and no significant differences in the topographic appearances of the instrument surfaces after fractures.

scholarly journals New electronic apex locator Romiapex A-15 presented accuracy for working length determination in permanent teeth

2014 ◽  
Vol 2 (1) ◽  
Author(s):  
Etevaldo Matos Maia Filho ◽  
Cláudia De Castro Rizzi ◽  
Daniela Silva Barroso de Oliveira ◽  
Paulo Nelson Filho ◽  
Raquel Assed Bezerra da Silva ◽  
...  
Keyword(s):  
Ex Vivo ◽  
Intraclass Correlation ◽  
Permanent Teeth ◽  
The Real ◽  
Root Canals ◽  
Dental Crowns ◽  
Working Length ◽  
Significant Difference ◽  
Student’S T ◽  
Similar Accuracy

Purpose: The present study aims to evaluate, ex vivo, the accuracy of electronic apex locators Root ZX II and Romiapex-15, for working length (WL) determination in permanent teeth. Materials and Methods: Fourteen single-rooted teeth (incisors and canines), with their apices fully formed were used. The dental crowns were removed. The anatomic length of the tooth (real measurement) was visually determined through the insertion of a size 10 K-file until the tip of the instrument could be observed in the apical foramen under a microscope (20X). Teeth were fixed in a model of resin and adapted into alginate soaked with saline solution, which was used as an  electrical conductor. Using a K-file, root canals were measured electronically using both devices. The results obtained for each apex locator were compared to the real measurements. The accuracy between the devices was statistically analyzed using the Bland-Altman graph, Intraclass Correlation Coefficient (ICC), and Student’s t-test. Results: The mean difference between the measurements using the Root ZX II was 0.277mm greater than the real measurement, while the measurements from the Romiapex-15 were 0.308mm higher on average. The comparison between Root ZX II and Romiapex-15 had no significant difference (p= 0.868). Conclusion: It was concluded that Root ZX II and Romiapex-15 had similar accuracy. Romiapex-15 could be an option for WL determination in permanent teeth.

scholarly journals Prevalence of major apical foramen mismatching the root apex in root canals of human permanent teeth

RSBO ◽  
2017 ◽  
Vol 13 (3) ◽  
pp. 188
Author(s):  
Liana Freire de Brito ◽  
Sylas Jamerson Sá Nogueira ◽  
Claudio Maniglia Ferreira ◽  
Fabio De Almeida Gomes ◽  
Bruno Carvalho Sousa
Keyword(s):  
Ex Vivo ◽  
Incidence Angle ◽  
Root Apex ◽  
Ethics Committee ◽  
Descriptive Statistics ◽  
Permanent Teeth ◽  
Chi Square ◽  
Root Canals ◽  
Working Length ◽  
Chi Square Test

The periapical radiograph is used to determine the working length in endodontic treatment. However, this radiograph does not define the position of the major apical foramen. Objective: This ex vivo laboratorial study aims to determine the prevalence of the major apical foramen mismatching the root apex in human permanent teeth, because when present, this mismatch makes the radiographic method inaccurate for determining the working length. Material and methods: This study used 400 human permanent teeth: 100 incisors, 100 canines, 100 premolars, and 100 molars, totalizing 634 canals (Ethics Committee, Federal University of Ceará #263/10). The access and negotiation of the root canals were performed with K-type files #10 and #15 until the tip of the instrument were visible at the root foramen through 5-fold magnifying glass. Periapical radiographs were performed on bucco-lingual incidence for single-rooted teeth; the incidence angle was changed for multi-rooted teeth. The films were processed and then analyzed by three calibrated examiners (Kappa 80%). Descriptive statistics and chi-square test were used for analyzing of the results. Results: The prevalence of major apical foramens mismatching the root apex was 19.72% of the canals studied. The incisors showed the lowest prevalence (9%, p<0.05) while the highest prevalence was seen in canine teeth (28%). Conclusion: According to the methodology applied, the prevalence of major apical foramens mismatching the root apex foramens make necessary an adjunct method for determining the working length, because it alone was not capable of determining the foramen position.

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