Publication: Mechanical Properties of Glide Path Preparation Instruments with Different Pitch Lengths
dc.contributor.author | Al Raeesi, Dana | |
dc.contributor.author | El Abed, Rashid | |
dc.date.accessioned | 2022-01-04T06:37:42Z | |
dc.date.available | 2022-01-04T06:37:42Z | |
dc.date.issued | 2018 | |
dc.description.abstract | Introduction: This study compared the effects of pitch length on the torsional resistance and cyclic fatigue resistance of glide path preparation instruments. Methods: G-File (G1 and G2; Micro-Mega, Besanc ̧on,France) and new generation G-File (NG1 and NG2,Micro-Mega) instruments were compared to evaluate the effects of the shorter pitch of the latter (25% shorter than G-File). G1 and NG1 have a #12 tip size, whereasG2 and NG2 have a #17 tip size. All the files have the same taper of 3%. For comparing the torsional resistances (n= 15), the file was fixed at 4 mm from the tip, and the clockwise rotation at a constant rotational speed of 2 rpm was adjusted until the file fractured. The maximum torsional load and distortion angle at fracture were recorded. For comparing the cyclic fatigue resistances (n= 15), the files were freely rotated in a simulated canal (radius, 3 mm; curvature, 90)at a speed of 300 rpm in a dynamic mode. When the file fractured, the time elapsed was recorded using a chronometer. The number of cycles to failure was calculated by multiplying the total time to failure by the rotation rate. Fractured fragments were examined under the scanning electron microscope. Results: The NG2 instruments had significantly higher fatigue resistance and torsional strength than the G2 instruments (P< .05) and showed approximately the same fatigue resistance as the G1. Scanning electron microscopic examinations revealed the typical appearances of 2 failure modes. Conclusions: A shorter pitch design increased cyclic fatigue resistance and torsional strength of the glide path instruments | en_US |
dc.identifier.other | 304-2018.44 | |
dc.identifier.uri | https://repository.mbru.ac.ae/handle/1/669 | |
dc.language.iso | en | en_US |
dc.subject | Cyclic fatigue | en_US |
dc.subject | Glide-path | en_US |
dc.subject | Nickel-titanium rotary instrument | en_US |
dc.subject | Pitch | en_US |
dc.subject | Torsional resistance | en_US |
dc.title | Mechanical Properties of Glide Path Preparation Instruments with Different Pitch Lengths | en_US |
dc.type | Article | en_US |
dspace.entity.type | Publication | en_US |