Effect of Different Instrumentation Techniques on Vertical Root Fracture Resistance of Endodontically Treated XXXX .

@entity3406 @entity174 @entity16839 @entity9030 @entity26988 @entity4500 @entity702 @entity10193
STATEMENT OF THE PROBLEM: Vertical root @entity174 are @entity16839 events that often result in tooth extraction. Many contributing factor are associated with increasing incidence of vertical root @entity174 . Root canal preparation is one of the predisposing factors which can increase the root susceptibility to vertical @entity174 . PURPOSE: The aim of this study was to compare the effects of three different instrumentation techniques on vertical root @entity174 resistance of endodontically treated @entity4500 . MATERIALS AND METHODS: In this study, 120 freshly extracted mandibular premolar @entity4500 of similar dimensions were decoronated and randomly divided into control (n=30), @entity3406 - @entity702 hand K-file (HF, n=30), BioRaCe rotary file (BR, n=30), and WaveOne reciprocating single-file (WO, n=30) groups. After cleaning and shaping the root canals, @entity9030 was used as canal sealer, and @entity10193 was completed using the continuous wave technique. The root canals were embedded vertically in standardised autopolymerising acrylic resin blocks, and subjected to a vertical load to cause vertical root @entity174 . The forces required to induce @entity174 were measured using a universal testing machine. ANOVA and Tukey's post-hoc test were used to analyse the data. RESULTS: All experimental groups showed statistically significant reductions in @entity174 resistance as compared with the control group. There was a statistically significant difference between the HF and BR groups. The WO group did not differ significantly from the HF group or the BR group. CONCLUSION: All three instrumentation techniques caused weakening of the structure of the roots, and rendered them susceptible to @entity174 under lesser load than unprepared roots. The @entity174 resistance of roots prepared with the single-file reciprocating technique was similar to that of those prepared with @entity26988 hand and rotary instrumentation techniques.
