scholarly journals An In vitro Comparative Study to Evaluate The Apical Seal of Root Canals Prepared by Rotary Versus Reciprocating Wave-One Nickel Titanium System

2014 ◽  
Vol 14 (2) ◽  
pp. 288-293
Author(s):  
Rasha Al-Shamaa ◽  
Makdad Chakmakchi ◽  
Karam Thiab
Keyword(s):  
Comparative Study ◽  
Nickel Titanium ◽  
Root Canals

Comparative characteristic of the degree of apical transport and the centering properties of nickel-titanium tools in the austenitic and martensitic phases

2020 ◽  
pp. 31-41
Author(s):  
Bogdan R. SHUMILOVICH ◽  
Stanislav V. MIKLYAEV
Keyword(s):  
In Vitro Study ◽  
Nickel Titanium ◽  
Comparative Characteristic ◽  
Micro Ct ◽  
Significance Level ◽  
Root Canals ◽  
Mechanical Preparation ◽  
Channel Transport ◽  
Tomography Data

Abstract. The purpose of this in vitro study was to compare the degree of root channel transport and the level of centering of the three most practical endodontic nickel-titanium rotary systems HyFlex EDM, Protaper NEXT and M-two using conical beam computed tomography data. In total, we selected 45 removed from periodontological indications of the first upper jaw molars with fully formed apical sections for the study. A prerequisite for the study was the presence of МВ1 and МВ2 in the anterior buccal root. We randomized all teeth into 3 groups (n = 15) and prepared samples using the files HyFlex EDM, Protaper NEXT and M-two. We evaluated the centering capacity and volume of channel transport by comparing preoperative and postoperative micro-CT scans. We used ANOVA tests, the classification trees method, and the forecast deviation calculation for statistical analysis. The significance level was at 0.05. The channels prepared by means of HyFlex EDM showed the minimum values of extent of transportation of root canals at all three levels (3, 5 and 7 mm from an apical konstriktion) that it connects with a unique design of cross section of a working part of the tool. Maximum channel transport was with M-two in the coronary (7 mm) and middle (5 mm) third. When analyzing centering abilities, channels prepared using the HyFlex EDM and Protaper NEXT system showed maximum values at all three levels compared to M-two files. The channels prepared by means of HyFlex EDM had the minimum values of transportation of the channel at all three levels of a root canal. Optimal mechanical preparation of root channels for the parameters studied at all levels was achieved using the tools HyFlex EDM and Protaper NEXT.

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 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.

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