Filling Capability of Different Obturation Techniques for the Sealing of Internal Root Resorption Located in the Middle Root Canal Third - An In Vitro Study.

INTRODUCTION

The aim of this study was to compare the filling ability of different root canal obturation techniques for the sealing of internal root resorption (IRR) located in the middle root canal third.

METHODS

Thirty maxillary central incisors were printed based on the standard tessellation language digital file obtained from a preoperative cone beam micro-computed tomography, which was edited to design IRRs in the middle root canal third (n = 30). Subsequently, the group was randomly subdivided according to the following obturation techniques: Group A: rigid carrier-based technique (n = 10) (GuttaCore); Group B: warm vertical condensation technique (n = 10) (Calamus); and Group C: single-cone technique with bioceramic cement (n = 10) (Bioceramic). Subsequently, postoperative micro-computed tomography scans were performed and extracted files were quantified using Fiji/ImageJ software The following volumetric parameters were quantified: channel resin volume (mm3), IRR "sphere" resin volume (mm3), "root" volume (without sphere) (mm3), residual resin volume (mm3) and total resin volume (mm3). Differences among the root canal filling techniques were evaluated using analysis of variance (ANOVA).

RESULTS

ANOVA revealed statistically significant differences in the resin penetration volumes between the different obturation techniques evaluated for the "channel," resorptive cavity "sphere," "root," and "residual" resin volumes (mm³) (P = .0001, P = .0001, P = .0065, and P < .0001, respectively).

CONCLUSIONS

The warm vertical condensation technique demonstrated a sealing ability comparable to that of the single-cone bioceramic technique in cases of IRR located in the middle third of the root canal system, as well as the overall root canal system, when compared to the GuttaCore carrier-based obturation technique.