Effect of early cervical preflaring and glide path utilizing rotary PathFiles or manual K-files on the amount of apically extruded debris from curved canals instrumented by rotary ProTaper system.

Abstract

Introduction: The aim of this study was to comparatively evaluate the amount of apically extruded debris when rotary ProTaper system was used for instrumentation of root canals preceded by rotary PathFiles or manual K-files and the effect of early cervical preflaring on total debris extrusion.
Material and method: Forty mesiobuccal canals of lower first molar teeth, with 20 to 40 degrees of root canal curvature, were selected. A size 8 K-file was placed up to the apical foramen to determine the patency. Working length was determined with the same instrument, 1 mm short of the foramen. According to the employed technique, the groups were labeled and initial instru- mentation was performed as follows: Group (1-A) initial instrumentation by hand K-files without cervical preflaring; Group (1-B) initial instrumentation by hand K-files with cervical preflaring; Group (2-A) initial instrumentation by rotary PathFiles without cervi- cal preflaring; Group (2-B) initial instrumentation by rotary PathFiles with cervical preflaring. Further instrumentation of all canals was completed by rotary ProTaper system. During instrumentation, each root canal was irrigated with 10 mL distilled water. Debris extruded through the apical foramen was collected using the Myers and Montgomery technique.
Result: Data obtained were analyzed using Kruskal-Wallis one way analysis of variance and Mann-Whitney U test with P=0.05 as the significance level. The results show no statistically significant difference among the groups.
Conclusion: There is no statistically significant difference of early cervical preflaring on the total amount of apically extruded debris. Also there is no statistically significant difference between rotary or manual glide path on the total amount of apically extruded debris.