INTRODUCTION: The aim of this study was to determine the
influence of two different glide path preparation methods
on the fracture rate of the Primary 25/08 WaveOne reciprocating
instrument. Preparation times for different glide path
methods and total time for root canal preparation, with and
without prior glide path preparation, were also calculated.
MATERIALS AND METHODS: ISO 15, 0.02 taper Endo-Training-
Blocks (n = 300) were selected and randomly divided
into three main groups (n = 100): Group 1: no glide path
(control); Group 2: glide path preparation with stainless-steel
hand files; and Group 3: glide path preparation with rotary
PathFiles. The time taken to prepare each glide path was
recorded. The specimens in each main group were then
randomly assigned into five subgroups (n=20). New Primary
25/08 WaveOne files were used for canal preparation in
each subgroup. The outcome was measured by recording
how many simulated canals could be shaped with one WaveOne
reciprocating file in each subgroup before instrument
breakage occurred. The average time it took to prepare
each of the simulated canals was calculated and recorded.
The data were collected and statistically analysed using the
ANOVA / Bonferroni test.
RESULTS: Glide path preparation with PathFiles was significantly
faster than with hand files (P<0.001). After the glide
path preparation had been performed with PathFiles, a
greater number of simulated canals could be prepared before
failure of the WaveOne file (P<0.001). Root canal preparation
time was significantly shorter (P<0.001) when an initial
glide path had been prepared with PathFiles. CONCLUSION : Initial glide path preparation with PathFiles resulted in shorter preparation times and allowed a higher number of simulated canals to be prepared before failure of the WaveOne instruments.