Evaluation of the combined effect of type of instrumentation systems and obturating materials on the outcome of pulpectomized primary molars-A comparative randomized clinical trial

Introduction

The application of rotary instrumentation is successful in removing the smear layer and significantly decreasing the root canal microflora, along with superior and consistent obturation in primary teeth. The obturating materials are effective against resistant root canal microflora due to their antimicrobial properties. Aim: To evaluate and compare the combined effect of the type of instrumentation and obturating material on the outcome of pulpectomized primary molars.

Methods

A total of 288 selected primary molars were randomly divided into three treatment groups (Group KS, HS and MF), according to the type of instrumentation used for cleaning and shaping of the root canals. Each group consisted of 96 teeth. In the groups KS, HS and MF, root canal instrumentation was carried-out with Kedo-SG Blue pediatric rotary files, HERO Shaper rotary files, and manual NiTi K-files, respectively. Following instrumentation, these three groups were further subdivided into 3 subgroups consisting of 32 teeth each and obturated using zinc oxide eugenol, Endoflas®, and DiaPex Plus®. The quality of the root filling was assessed immediately and evaluated both clinically and radiographically over a two-year period.

Results

The quality of obturation was superior in the root canals instrumented with rotary file systems compared to manual files. The success rate was not statistically significant on the combination of different types of instrumentation file systems and obturating materials at the end of follow-up period.

Conclusion

The outcome of pulpectomized teeth is not significantly influenced by the advanced physical characteristics of rotary files and the chemical and biological qualities of the obturating materials.