(PR85) Filling Ability of Two Different Root Canal Filling Techniques in Teeth With Perforating Internal Resorption

The study aimed to evaluate the filling ability of two different root canal filling techniques of simulated root canals with perforating internal resorption (PIR) located at the middle root third. For the projection and standardization of teeth with PIR, a human maxillary central incisor was selected and scanned using microcomputed tomography (microCT). The obtained images were reconstructed and a 3D model was obtained. With the aid of OrtogOnBlender software, a PIR was designed at the middle root canal third on the 3D model. 16 samples were printed using surgical resin and distributed in two groups according to the filling technique (n=8): G1 - Biodentine and G2 - BioRoot RCS + Biodentine. In G1 the root canal and the PIR were filled with Biodentine repair cement, while in G2 the apical third filling was performed with BioRoot RCS sealer and gutta-percha, complementing the PIR area filling with Biodentine repair cement. The samples were rescanned in microCT, reconstructed and the percentage volume of voids were calculated. Data was compared using one-way ANOVA with Tukey post-test (α=5%). The results showed that there were no statistically significant differences for percentage volume of voids between the groups G1 (5.73±3.11) and G2 (5.33±1.35) (P=0.767). Both filling techniques, the technique in which the apical third was previously filled with gutta-percha and endodontic sealer or the complete filling of the root canal with repair material, showed the same filling ability in teeth with perforating internal resorption located at the middle root canal third.