Review of C-shaped canals.
Instrumentation techniques and its effect
Review of concepts in instrumentation.
Understanding the forces applied during instrumentation allows the concept of balanced force to clean and shape curved canals without straightening the canal or producing iatrogenic errors
A classic method of passive step-back instrumentation produces an unforceful and gradual enlargement of root canals in an apical to coronal direction, and will reduce procedural accidents if done properly.
The step-back method of instrumentation is suggested as the best way to instrument curved canals in order to avoid possible complications.
Review of instrumentation
More curved canals and narrow canals will decrease the lifespan of a file
Files used previously are more likely to fracture than new ProTaper files
ProTaper rotary system maintained the canal curvature with speediness and few procedural errors, whereas traditional instrumentation can clean more canal surface.
Pre-flare the coronal third if considering reciprocation.
All preparation techniques left a variable portion of untreated surface in oval-shaped canals, however, instrumenting the canal as two separate canals appeared to increase the overall prepared surface.