Cyclic Fatigue resistance of Edge File X7 Endodontic System

Abstract

Aim of the study: this study aimed to evaluate the effect of different taper (4% and 6%) on the cyclic fatigue resistance of Edge file X7 system using three types of canal curvature 45°,60° and 90°.

Materials and Methods: In this research, sixty (60) NITI rotary files were utilized these files were split into two groups (n = 30 for each group), group one Edge File X7 taper 4%, group two Edge File X7 taper 6. Then, Each group was split up into three smaller groups, each with n = 10 instruments. each subgroup was tested in 45°, 60° and 90° canal curvature respectively in a stainless-steel   metal   block   containing   artificial   canal   with a radius of curvature of 3mm and diameter of 1.5 mm. Each file was rotated in a continuous rotation motion 300 rpm and 3N.cm torque until it fractured. The time it took to separate the files were noted. Each file's number of cycles to fracture (NCF) was computed. One-way ANOVA was used to statistically examine the data.

Results: At 45º canal curvature there is no statistical difference between Edge file X7 taper 4% and Edge file X7 taper 6% (p > 0.01). Regarding canal curvature of 60º there is statistical difference between Edge file X7 taper 4% and Edge file X7 taper 6% (p > 0.01). For canal curvature of 90 º there is statistical difference between Edge file X7 taper 4% and Edge file X7 taper 6% (p > 0.01).

Conclusion: This study concluded that the Edge File X7 system resists cyclic fatigue better when the canal curvature decreased. To limit the possibility of separation, it is advised that these files be used just once