Vertical root fractures often result in tooth extraction. There are many factors which contribute for this incidence & root canal preparation is one of the important cause in that.
Objective: The aim of this study was to compare the effects of three different instrumentation techniques on vertical root fracture resistance of endodontically treated teeth.
Materials and Methods: 45 freshly extracted mandibular premolar teeth of similar dimensions were randomly divided into hand K-file (HF, n = 15), Wave One reciprocating single-file (WO, n =15) & rotary file (RF, n = 15) groups. After cleaning and shaping the root canals, obturation was completed & root canals were embedded in standardized auto polymerizing acrylic resin blocks, subjected to a vertical load to cause vertical root fracture. The forces required to induce fractures were measured using a universal testing machine. ANOVA and Tukey’s post-hoc test were used to analyze the data.
Results: All experimental groups showed statistically significant reductions in fracture resistance as compared with the Hand files. The fracture resistance was more in HF followed by WO & RF group respectively.
Conclusion: Hand files were more resistance to fracture compared to others. But, all three instrumentation techniques caused weakening of the structure of the roots and rendered them susceptible to fracture.