Comparación radiográfica entre las técnicas crown down modificada y step back en la conformación de los conductos radiculares

Abstract

The biomechanical preparation of the root canal is one of the most important stages of endodontic therapy, it allows cleaning, shaping and disinfecting the root canal conditions, so that it can be sealed. Studies of various techniques have been proposed to facilitate behavioral treatments, including: Crown Down and Step Back, however, few supports and show which one present minor error during manual application. The reason of this study was to determine, trough radiographs, the errors produced by the techniques of modified Crown Down preparation and the Step Back technique in the conformation of the root canal. A descriptive investigation with quantitative approach and multivariable documentary transectional design was carried out. 88 radiographic cases of upper and lower molar teeth (1st and 2nd molars) distributed in two groups, were taken A with Step Back and B with modified Crown Down, which were evalued by 3 specialists. The data were analyzed using frequency tables using the SPSS 22.0 program. Regarding apical transportation and step formation, the technique that suffered the most cases was Crown Down with 9.8% and 11.7% respectively, in terms of lateral perforation and loss of work length, the Step Back technique reflected greater cases with 2.6% and 21.9% in the same order. By applying the Chi-square test, it was determined that there were no statistically significant differences in the techniques with the variables under study, however, in the numerical count, the modified Crown Down technique reflected fewer errors than Step Back.