A comparison of spreader penetration depth and load required in curved canal using two types of spreaders

Abstract

The aim of the present study was to compare nickel titanium and stainless
steel spreaders penetration depth and load in lateral compaction. Thirty curved mesial
canals of extracted mandibular molars were used in the study. The canals were
prepared using step-back technique with Gates-Glidden. Afterward the teeth were
divided randomly into 2 groups. In part 1 of the study, the force required to insert
each spreader to within 1 mm of the working length in an empty canal was measured .
In part 2, the force required to insert each spreader to within 2 mm of the working
length was measured in canal containing a master cone. ln part 3, the depth of
penetration of each spreader with a master cone in place using a 1.5 kg force was
measured. Using a t-test for paired samples, the results from pan 1 showed that nickel
titanium spreader required high significantly less force than stainless steel
s reader P<0.01 . ln part 2, a nickel titanium s reader re uired high si niticantl less
force than a stainless steel spreader .As expected in part 3, a nickel titanium spreader
penetrated to a significantly high depth than stainless steel spreader (P<0.0l