Influence of glide path on the screw-in effect and torque of nickel-titanium rotary files in simulated resin root canals

Title
Influence of glide path on the screw-in effect and torque of nickel-titanium rotary files in simulated resin root canals
Author(s)
박상신하정홍[하정홍]
Keywords
Glide path; Nickel-titanium file; ProTaper; Screw-in effect; Simulated resin root canal; Torque
Issue Date
201211
Publisher
대한치과보존학회
Citation
Restorative Dentistry and Endodontics, v.37, no.4, pp.215 - 219
Abstract
Objectives: The purpose of this study was to investigate the screw-in effect and torque generation depending on the size of glide path during root canal preparation. Materials and Methods: Forty Endo-Training Blocks (REF A 0177, Dentsply Maillefer)were used. They were divided into 4 groups. For groups 1, 2, 3, and 4, the glide path was established with ISO #13 Path File (Dentsply Maillefer), #15 NiTi K-file NITIFLEX (Dentsply Maillefer), modified #16 Path File (equivalent to #18), and #20 NiTi K-file NITIFLEX, respectively. The screw-in force and resultant torque were measured using a custom-made experimental apparatus while canals were instrumented with ProTaper S1 (Dentsply Maillefer) at a constant speed of 300 rpm with an automated pecking motion. A statistical analysis was performed using one-way analysis of variance and the Duncan post hoc comparison test. Results: Group 4 showed lowest screw-in effect (2.796 ± 0.134) among the groups (p < 0.05). Torque was inversely proportional to the glide path of each group. In #20 glide path group, the screw-in effect and torque decreased at the last 1 mm from the apical terminus. However, in the other groups, the decrease of the screw-in effect and torque did not occur in the last 1 mm from the apical terminus. Conclusions: The establishment of a larger glide path before NiTi rotary instrumentation appears to be appropriate for safely shaping the canal. It is recommended to establish #20 glide path with NiTi file when using ProTaper NiTi rotary instruments system safely.
URI
http://hdl.handle.net/YU.REPOSITORY/26905http://dx.doi.org/10.5395/rde.2012.37.4.215
ISSN
2234-7658
Appears in Collections:
공과대학 > 기계공학부 > Articles
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