A micro-computed tomographic study of remaining filling materials of two bioceramic sealers and epoxy resin sealer after retreatment

Abstract

Objective This study evaluated the presence of residual root canal filling material after retreatment using micro-computed tomography (micro-CT). Materials and Methods Extracted human teeth (single- and double-rooted, n = 21/each; C-shaped, n = 15) were prepared with ProFile and randomly assigned to three subgroups for obturation with gutta-percha and three different sealers (EndoSeal MTA, EndoSequence BC sealer, and AH Plus). After 10 days, the filling material was removed and the root canals were instrumented one size up from the previous master apical file size. The teeth were scanned using micro-CT before and after retreatment. The percentage of remaining filling material after retreatment was calculated at the coronal, middle, and apical thirds. Data were analyzed using the Kruskal-Wallis test and Mann-Whitney U test with Bonferroni post hoc correction. Results The tested sealers showed no significant differences in the percentage of remaining filling material in single- and double-rooted teeth, although EndoSeal MTA showed the highest value in C-shaped roots ( p < 0.05). The percentage of remaining filling material of AH Plus and EndoSeal MTA was significantly higher in C-shaped roots than in single- or double-roots ( p < 0.05), while that of BC sealer was similar across all root types. EndoSeal MTA showed the highest values at the apical thirds of single- and double-roots ( p < 0.05); otherwise, no significant differences were observed among the coronal, middle, and apical thirds. Conclusions Within the limitations of this study, a large amount of EndoSeal MTA remained after retreatment, especially in C-shaped root canals.

Micro CT pilot evaluation of removability of two endodontic sealers

“…These studies [11,28,30] attribute this difference to the fact that EndoSequence BC has the potential to penetrate dentinal tubules, leave intratubular tags, and adhere to canal walls [9,27,[31][32][33][34]. Studies comparable to those mentioned in the previous sentences [9,11,27,28,[30][31][32][33][34] have found the opposite [35,36]. The removability of AH Plus and GP after cold lateral obturation was between 89% and 99% in some studies [20][21][22], while Ma et al reported a 96% removal of GP and iRoot SP sealer [19]; the iRoot SP sealer is identical to EndoSequence BC sealer [10].…”

Micro-computed tomographic evaluation of a new system for root canal filling using calcium silicate-based root canal sealers

“…Many studies have been proposed the use of micro-CT for the evaluation of endodontic materials [ 1 3 4 12 20 21 22 ]. Micro-CT allows a nondestructive, quantitative and qualitative high-resolution imaging-based assessment [ 3 ].…”

How do imaging protocols affect the assessment of root-end fillings?

“…Micro-computed tomography (micro-CT) is a 3-dimensional (3D) nondestructive and reproducible tool that is highly accurate for the evaluation of root canal filling quality and the presence of voids [ 3 9 10 11 ]. Many studies have focused on evaluating the material/dentin using 3D information using micro-CT, but have presented significant variation in the reported voxel sizes used for scanning [ 3 5 12 13 14 ].…”