Abstract
The aim of this study was to evaluate the filling ability of a new ready-to-use calcium silicate-based sealer using thermoplastic or single-cone technique in flattened root canals. Twenty-four flattened distal canals of mandibular molars with a buccolingual diameter 4 or more times larger than the mesiodistal diameter were selected. The root canals were prepared and filled (n = 12), according to the following techniques: thermoplastic or single-cone technique using Bio-C Sealer. The teeth were scanned using Skycan 1176 micro-computed tomography (micro-CT) - voxel size 8.74 µm, before and after filling the root canal. The percentage of voids in the filled root canals was evaluated, and the data were statistically analyzed using the unpaired t-test (α = 0.05). The root canals filled using the thermoplastic technique created a smaller percentage of voids in the cervical/middle thirds than those filled using the single-cone technique (p < 0.05). There was no difference in the percentage of voids using either technique in the apical third (p > 0.05). The flattened root canals in the cervical/middle thirds were better filled using the ready-to-use calcium silicate-based sealer associated to the thermoplastic technique, compared with the single-cone technique. In the apical third, the techniques showed similar filling ability.
Highlights
Submitted: May 23, 2020 Accepted for publication: November 19, 2020 Last revision: November 30, 2020The prognosis of endodontic treatment depends on three-dimensional filling[1,2] and sealing of the root canal system,[3] to ensure prevention of reinfection.[4]
The quality of the filling is influenced by root canal morphology.[1,3,4,5,6]
Different obturation techniques have been proposed for filling the root canal system.[3,4,10,11,12]
Summary
Submitted: May 23, 2020 Accepted for publication: November 19, 2020 Last revision: November 30, 2020The prognosis of endodontic treatment depends on three-dimensional filling[1,2] and sealing of the root canal system,[3] to ensure prevention of reinfection.[4]. The quality of the filling is influenced by root canal morphology.[1,3,4,5,6] Root canals with a large buccolingual extension are more difficult to fill.[1,3,4,5,6] the centric position obtained by nickel-titanium (NiTi) instruments leaves a considerable uninstrumented surface in flattened areas,[7,8,9] thereby affecting the quality of root canal fillings.[1,3,5] some studies have evaluated the obturation of oval canals,[1,3,4,5,6] the literature is very scarce regarding the filling of flattened canals with a buccolingual diameter 4 or more times larger than the mesiodistal diameter.
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