Ginjeira, António Manuel Pinto, 1958-Sterbet, Cristina2018-12-202018-12-202018http://hdl.handle.net/10451/36096Tese de mestrado, Medicina Dentária, Universidade de Lisboa, Faculdade de Medicina Dentária, 2018INTRODUCTION: The evolution of endodontic instruments has been constant over the time. At instrumentation, the original configuration of the root canal should be maintained without creating any iatrogenic act. The introduction of NiTi rotary instruments has generally improved the quality of instrumentation. AIM: The objective of this study was to compare the efficiency of the maintenance of the root canal anatomy by analysing the amount of material removed in the S-shaped curved acrylic resin blocks using different systems: ProTaper Gold ™, TRUShape® and HyFlex® EDM. MATHERIALS AND METHODS: A quantitative analysis was made by measuring the canal of 36 samples, distributed by three groups of 12 samples each (Group A - ProTaper Gold™; Group B - TRUShape® and Group C - HyFlex® EDM), by superimposed images of pre and post instrumentation using Rhinoceros Software. In the qualitative analysis, blinded examiners evaluated 3 images from each group and refer the presence or absence of rectifications in the coronal and apical curvatures. The statistical analysis was obtained by using the Shapiro-Wilk and Kruskal Wallis test. Multiple comparisons were automatically adjusted with the Bonferroni correction with a significance of p<0.05. RESULTS: There were no statistically significant differences on canal transportation (p<0.05). Only groups A and C presented significant statistically differences on the outer side and on the outer side at apical curvature. More canal transportation was observed in group A when compared with group C. CONCLUSION: It might be assumed that HyFlex® EDM was the rotary system that has more respect for original canal anatomy. Higher flexibility might be the predominant propriety responsible by these results. ProTaper Gold ™ was the system that originated the greatest modification of the original canal, presenting a significant tendency to straightened apical curvature and outer side.engEndodontiaTratamento endodônticoTeses de mestrado - 2018master thesis201987473