Use of Nickel-Titanium Rotary PathFile to Create the Glide Path: Comparison With Manual Preflaring in Simulated Root Canals (original) (raw)
Related papers
Journal of Endodontics, 2009
Introduction: Nickel-titanium rotary instruments reduce procedural errors and the time required to finish root canal preparation. The goal of this study was to evaluate the effectiveness of a manual glide path on the preparation of curved root canals with Mtwo rotary system. Methods: Forty buccal root canals with angles of curvature between 25 to 76 degrees were randomly divided into 4 groups (n = 10); 2 groups were instrumented with Mtwo instruments to the full length, and in the other 2 groups a glide path with #08-15 K files was performed before instrumentation with Mtwo system. Digital double radiographic technique was used to determine apical transportation and the change in angle of curvature. Also working time was calculated. Results: No statistically significant differences in the angle of canal curvature, apical transportation, and the working time were found between groups with glide path and no glide path. No significant differences were found when comparing the results of 3 variables between degrees of curvature. Conclusion: The use of a manual glide path before Mtwo rotary system did not influence the apical transportation in curved root canals.
Nickel-titanium rotary instruments reduce procedural errors and the time required to finish root canal preparation. The goal of this study was to evaluate the occurrences of apical transportation and canal aberrations produced with different instruments used to create a glide path in the preparation of curved root canals, namely manual K-files (Dentsply Maillefer, Ballaigues, Switzerland) and PathFile (Dentsply Maillefer) and Mtwo (Sweden and Martina, Padua, Italy) nickel-titanium rotary files. METHODS: The mesial canals of 45 mandibular first and second molars (with curvature angles between 25° and 35°) were selected for this study. The specimens were divided randomly into 3 groups with 15 canals each, and canal preparation was performed by an endodontist using #10-15-20 K-type stainless steel manual files (group M), #13-16-19 PathFile rotary instruments (group PF), and #10-15-20 Mtwo rotary instruments (group MT). The double digital radiograph technique was used, pre- and postinstrumentation, to assess whether apical transportation and/or aberration in root canal morphology occurred. The initial and final images of the central axis of the canals were compared by superimposition through computerized analysis and with the aid of magnification. The specimens were analyzed by 3 evaluators, whose calibration was checked using the Kendall agreement test. RESULTS: No apical transportation or aberration in root canal morphology occurred in any of the teeth; therefore, no statistical analysis was conducted. CONCLUSIONS: Neither the manual instruments nor the PathFile or Mtwo rotary instruments used to create a glide path had any influence on the occurrence of apical transportation or produced any canal aberration.
Dental Research Journal, 2015
Background: Nickel-titanium (NiTi) rotary instrumentation carries a risk of fracture, mainly as a result of fl exural (fatigue fracture) and torsional (shear failure) stresses. This risk might be reduced by creating a glide path before NiTi rotary instrumentation. The aim of this study was to compare various root canal parameters with the new WaveOne single-fi le reciprocating system in mesial canals of mandibular molars with and without glide path using cone beam computed tomography (CBCT). Materials and Methods: One hundred mandibular molar teeth with canal curvature between 20° and 30° were divided into two groups of 50 teeth each. In Group 1, no glide path was created, whereas in Group 2, a glide path was created with PathFiles at working length (WL). In both groups, canals were shaped with WaveOne primary reciprocating fi les to the WL. Canals were scanned in a CBCT unit before and after instrumentation. Postinstrumentation changes in canal curvature, crosssectional area, centric ability, residual dentin thickness, and the extent of canal transportation were calculated using image analysis software and subjected to statistical analysis. Data were analyzed using Student's t-test and Mann-Whitney U-test (P < 0.05). Results: The mean difference of root canal curvature, cross-sectional area, centric ability, and residual dentin thickness increased, whereas it reduced signifi cantly for canal transportation in Group 2. Conclusion: WaveOne NiTi fi les appeared to maintain the original canal anatomy and the presence of a glide path further improves their performance and was found to be benefi cial for all the parameters tested in this study.
Journal of Stomatology
Introduction: During the preparation of curved root canals, various complications may occur as a change in original path and apical transportation. Securing a glide path has a good effect on alleviating these complications. Objectives: This study aimed to compare three glide path techniques, including K-file Manual, ProGlider, and PathFile in the apical transportation of curved root canals prepared with ProTaper Next. Material and methods: In a laboratory study, 40 canals of upper and lower molars with a curvature ranging from 25 to 45 degrees have been selected for this study. Specimens were divided randomly into four groups, with ten canals each. Each group achieved a glide path with one of the systems mentioned above, while the fourth group remained without any glide path achievement. Then, the canals were prepared using ProTaper Next system. Radial images were taken pre-and post-instrumentation, and analyzed in AutoCAD, 2018 software. Data were examined statistically using SPSS version 25 software. Results: Thee ProGlider group (PG) showed the lowest apical transportation, and no statistically significant differences were found between the Manual K-file (M) and PathFile (PF) groups in terms of decreasing the apical transportation, with p = 0.001. Conclusions: The ProGlider file combined with the ProTaper Next system showed reduced apical transportation compared with PathFile and Manual K-file, which presented a similar effect in apical transportation.
Odontology, 2019
This study aimed to analyze force/torque generation and canal volume changes of NiTi rotary glide path preparation using HyFlex EDM Glide Path File in comparison to manual stainless steel K-file instrumentation. Thirty extracted mandibular incisors with a minimally curved and narrow root canal were randomly divided into three groups (n = 10) according to the instrumentation kinematics: Optimum Glide Path motion (OGP) or continuous rotation (CR) with HyFlex EDM Glide Path Files using a custom-made automated-root-canal-preparation device and manual instrumentation with stainless steel K-files (SS) in watch-winding motion. Torque and force were monitored with a custom-made torque/force analyzing device. Canal volume changes and transportation values were measured on micro-computed tomographic images taken before and after the glide path preparation. The data were statistically evaluated using Kruskal-Wallis test and Mann-Whitney U test with Bonferroni correction, with a significance level set at 5%. Maximum upward apical force, representing the screw-in force, was lower in groups OGP and CR compared with that in group SS (P < 0.05). Group CR showed the highest maximum clockwise torque value and canal volume changes, followed by groups OGP and SS (P < 0.05). Canal transportation values at 1 and 3 mm from the apex were not significantly different among groups. Within the limitations of this study, rotary glide path preparation generated smaller screw-in force, larger torque and larger canal volume changes than manual preparation. OGP motion generated smaller torque and less canal volume changes than CR.