[Canal preparation of fluorotic teeth].

This study compared the effectiveness of nine root-canal preparation techniques of fluorotic teeth. Seventy-three canal systems from 53 extracted human fluorotic teeth were instrumented. Pre-and postinstrumentation measurements were taken of the root canal systems in the cervical, middle and apical thirds; they proved the efficiency of the method using Rispi and Helifile. The results of this study were also extrapolated to the clinical situation.