Avaliação qualitativa do preparo de canais radiculares realizado “in vitro” com instrumentos rotatórios de níquel - titânio RaCe e K3

Abstract

The aim of this study was to analyze the taper and regulari- ty of root canals prepared with rotary nickel-titanium system Race ® and K3 ® , using angle reducer Dentflex ® . The experiment involved mesial canals of thirty human molars, upper and lo- wer were randomly assigned to two groups of fifteen, according to the two types of rotary instruments: RaCe ® and K3 ® . Since then, there was casting of root canals, to then subject the teeth to demineralization in 35% hydrochloric acid, thereby obtaining the same mold. These patterns were analyzed, where there was a taper and regularity of root canals prepared. The data were tabulated and analyzed statistically by the Mann-Whitney and Chi-square. The results indicate the predominance of regular conical forms, in all thirds (cervical, middle, apical) in mesial buccal and mesial lingual and palatine canals prepared with Race ® and K3 ® , but statistically significant difference between the number of occurrence of irregular cylindrical shape along the lines of mesiobuccal canals below, prepared with RaCe ® .