RESULTS

There was no difference in the initial volume values of the root-end cavities (P > 0.05). After the insertion of root-end filling materials, the most significant volumes of empty spaces were observed in the NeoMTA Plus group (P < 0.05), with no difference for the BioRoot RCS and MTA Angelus groups (P > 0.05). In descending order, the average percentage of empty spaces for the experimental groups was 19.9% for NeoMTA Plus, 6.3% for MTA Angelus, and 4.9% for BioRoot RCS. Table 1 presents the volumes of the root-end cavities before filling with the root-end filling materials, the volume of filling material in the root-end cavities, and the percentage of empty spaces. In contrast, Figure 2 presents the 3D reconstruction of a sample of each experimental group. In red are empty spaces inside the root-end filling material and at the dentin-material interface.